Mercurial > dropbear
annotate libtomcrypt/src/ciphers/twofish/twofish.c @ 1013:a1e79ffa5862
Tighten validation of DH values. Odds of x==0 being generated are
improbable, roughly 2**-1023
Regression in 0.49
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 10 Feb 2015 21:46:19 +0800 |
parents | 0cbe8f6dbf9e |
children | eef377591301 |
rev | line source |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 |
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12 /** |
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13 @file twofish.c |
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14 Implementation of Twofish by Tom St Denis |
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15 */ |
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16 #include "tomcrypt.h" |
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17 |
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18 #ifdef TWOFISH |
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19 |
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20 /* first TWOFISH_ALL_TABLES must ensure TWOFISH_TABLES is defined */ |
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21 #ifdef TWOFISH_ALL_TABLES |
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22 #ifndef TWOFISH_TABLES |
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23 #define TWOFISH_TABLES |
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24 #endif |
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25 #endif |
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26 |
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27 const struct ltc_cipher_descriptor twofish_desc = |
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28 { |
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29 "twofish", |
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30 7, |
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31 16, 32, 16, 16, |
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32 &twofish_setup, |
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33 &twofish_ecb_encrypt, |
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34 &twofish_ecb_decrypt, |
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35 &twofish_test, |
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36 &twofish_done, |
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37 &twofish_keysize, |
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38 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL |
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39 }; |
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40 |
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41 /* the two polynomials */ |
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42 #define MDS_POLY 0x169 |
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43 #define RS_POLY 0x14D |
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44 |
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45 /* The 4x4 MDS Linear Transform */ |
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46 #if 0 |
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47 static const unsigned char MDS[4][4] = { |
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48 { 0x01, 0xEF, 0x5B, 0x5B }, |
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49 { 0x5B, 0xEF, 0xEF, 0x01 }, |
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50 { 0xEF, 0x5B, 0x01, 0xEF }, |
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51 { 0xEF, 0x01, 0xEF, 0x5B } |
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52 }; |
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53 #endif |
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54 |
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55 /* The 4x8 RS Linear Transform */ |
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56 static const unsigned char RS[4][8] = { |
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57 { 0x01, 0xA4, 0x55, 0x87, 0x5A, 0x58, 0xDB, 0x9E }, |
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58 { 0xA4, 0x56, 0x82, 0xF3, 0X1E, 0XC6, 0X68, 0XE5 }, |
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59 { 0X02, 0XA1, 0XFC, 0XC1, 0X47, 0XAE, 0X3D, 0X19 }, |
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60 { 0XA4, 0X55, 0X87, 0X5A, 0X58, 0XDB, 0X9E, 0X03 } |
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61 }; |
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62 |
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63 /* sbox usage orderings */ |
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64 static const unsigned char qord[4][5] = { |
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65 { 1, 1, 0, 0, 1 }, |
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66 { 0, 1, 1, 0, 0 }, |
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67 { 0, 0, 0, 1, 1 }, |
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68 { 1, 0, 1, 1, 0 } |
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69 }; |
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70 |
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71 #ifdef TWOFISH_TABLES |
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72 |
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73 #include "twofish_tab.c" |
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74 |
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75 #define sbox(i, x) ((ulong32)SBOX[i][(x)&255]) |
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76 |
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77 #else |
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78 |
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79 /* The Q-box tables */ |
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80 static const unsigned char qbox[2][4][16] = { |
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81 { |
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82 { 0x8, 0x1, 0x7, 0xD, 0x6, 0xF, 0x3, 0x2, 0x0, 0xB, 0x5, 0x9, 0xE, 0xC, 0xA, 0x4 }, |
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83 { 0xE, 0XC, 0XB, 0X8, 0X1, 0X2, 0X3, 0X5, 0XF, 0X4, 0XA, 0X6, 0X7, 0X0, 0X9, 0XD }, |
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84 { 0XB, 0XA, 0X5, 0XE, 0X6, 0XD, 0X9, 0X0, 0XC, 0X8, 0XF, 0X3, 0X2, 0X4, 0X7, 0X1 }, |
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85 { 0XD, 0X7, 0XF, 0X4, 0X1, 0X2, 0X6, 0XE, 0X9, 0XB, 0X3, 0X0, 0X8, 0X5, 0XC, 0XA } |
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86 }, |
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87 { |
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88 { 0X2, 0X8, 0XB, 0XD, 0XF, 0X7, 0X6, 0XE, 0X3, 0X1, 0X9, 0X4, 0X0, 0XA, 0XC, 0X5 }, |
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89 { 0X1, 0XE, 0X2, 0XB, 0X4, 0XC, 0X3, 0X7, 0X6, 0XD, 0XA, 0X5, 0XF, 0X9, 0X0, 0X8 }, |
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90 { 0X4, 0XC, 0X7, 0X5, 0X1, 0X6, 0X9, 0XA, 0X0, 0XE, 0XD, 0X8, 0X2, 0XB, 0X3, 0XF }, |
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91 { 0xB, 0X9, 0X5, 0X1, 0XC, 0X3, 0XD, 0XE, 0X6, 0X4, 0X7, 0XF, 0X2, 0X0, 0X8, 0XA } |
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92 } |
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93 }; |
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94 |
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95 /* computes S_i[x] */ |
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96 #ifdef LTC_CLEAN_STACK |
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97 static ulong32 _sbox(int i, ulong32 x) |
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98 #else |
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99 static ulong32 sbox(int i, ulong32 x) |
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100 #endif |
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101 { |
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102 unsigned char a0,b0,a1,b1,a2,b2,a3,b3,a4,b4,y; |
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103 |
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104 /* a0,b0 = [x/16], x mod 16 */ |
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105 a0 = (unsigned char)((x>>4)&15); |
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106 b0 = (unsigned char)((x)&15); |
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107 |
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108 /* a1 = a0 ^ b0 */ |
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109 a1 = a0 ^ b0; |
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110 |
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111 /* b1 = a0 ^ ROR(b0, 1) ^ 8a0 */ |
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112 b1 = (a0 ^ ((b0<<3)|(b0>>1)) ^ (a0<<3)) & 15; |
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113 |
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114 /* a2,b2 = t0[a1], t1[b1] */ |
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115 a2 = qbox[i][0][(int)a1]; |
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116 b2 = qbox[i][1][(int)b1]; |
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117 |
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118 /* a3 = a2 ^ b2 */ |
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119 a3 = a2 ^ b2; |
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120 |
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121 /* b3 = a2 ^ ROR(b2, 1) ^ 8a2 */ |
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122 b3 = (a2 ^ ((b2<<3)|(b2>>1)) ^ (a2<<3)) & 15; |
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123 |
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124 /* a4,b4 = t2[a3], t3[b3] */ |
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125 a4 = qbox[i][2][(int)a3]; |
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126 b4 = qbox[i][3][(int)b3]; |
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127 |
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128 /* y = 16b4 + a4 */ |
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129 y = (b4 << 4) + a4; |
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130 |
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131 /* return result */ |
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132 return (ulong32)y; |
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133 } |
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134 |
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135 #ifdef LTC_CLEAN_STACK |
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136 static ulong32 sbox(int i, ulong32 x) |
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137 { |
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138 ulong32 y; |
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139 y = _sbox(i, x); |
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140 burn_stack(sizeof(unsigned char) * 11); |
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141 return y; |
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142 } |
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143 #endif /* LTC_CLEAN_STACK */ |
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144 |
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145 #endif /* TWOFISH_TABLES */ |
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146 |
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147 /* computes ab mod p */ |
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148 static ulong32 gf_mult(ulong32 a, ulong32 b, ulong32 p) |
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149 { |
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150 ulong32 result, B[2], P[2]; |
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151 |
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152 P[1] = p; |
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153 B[1] = b; |
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154 result = P[0] = B[0] = 0; |
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155 |
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156 /* unrolled branchless GF multiplier */ |
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157 result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1); |
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158 result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1); |
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159 result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1); |
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160 result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1); |
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161 result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1); |
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162 result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1); |
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163 result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1); |
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164 result ^= B[a&1]; |
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165 |
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166 return result; |
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167 } |
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168 |
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169 /* computes [y0 y1 y2 y3] = MDS . [x0] */ |
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170 #ifndef TWOFISH_TABLES |
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171 static ulong32 mds_column_mult(unsigned char in, int col) |
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172 { |
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173 ulong32 x01, x5B, xEF; |
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174 |
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175 x01 = in; |
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176 x5B = gf_mult(in, 0x5B, MDS_POLY); |
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177 xEF = gf_mult(in, 0xEF, MDS_POLY); |
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178 |
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179 switch (col) { |
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180 case 0: |
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181 return (x01 << 0 ) | |
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182 (x5B << 8 ) | |
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183 (xEF << 16) | |
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184 (xEF << 24); |
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185 case 1: |
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186 return (xEF << 0 ) | |
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187 (xEF << 8 ) | |
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188 (x5B << 16) | |
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189 (x01 << 24); |
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190 case 2: |
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191 return (x5B << 0 ) | |
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192 (xEF << 8 ) | |
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193 (x01 << 16) | |
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194 (xEF << 24); |
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195 case 3: |
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196 return (x5B << 0 ) | |
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197 (x01 << 8 ) | |
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198 (xEF << 16) | |
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199 (x5B << 24); |
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200 } |
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201 /* avoid warnings, we'd never get here normally but just to calm compiler warnings... */ |
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202 return 0; |
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203 } |
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204 |
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205 #else /* !TWOFISH_TABLES */ |
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206 |
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207 #define mds_column_mult(x, i) mds_tab[i][x] |
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208 |
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209 #endif /* TWOFISH_TABLES */ |
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210 |
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211 /* Computes [y0 y1 y2 y3] = MDS . [x0 x1 x2 x3] */ |
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212 static void mds_mult(const unsigned char *in, unsigned char *out) |
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213 { |
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214 int x; |
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215 ulong32 tmp; |
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216 for (tmp = x = 0; x < 4; x++) { |
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217 tmp ^= mds_column_mult(in[x], x); |
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218 } |
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219 STORE32L(tmp, out); |
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220 } |
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221 |
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222 #ifdef TWOFISH_ALL_TABLES |
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223 /* computes [y0 y1 y2 y3] = RS . [x0 x1 x2 x3 x4 x5 x6 x7] */ |
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224 static void rs_mult(const unsigned char *in, unsigned char *out) |
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225 { |
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226 ulong32 tmp; |
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227 tmp = rs_tab0[in[0]] ^ rs_tab1[in[1]] ^ rs_tab2[in[2]] ^ rs_tab3[in[3]] ^ |
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228 rs_tab4[in[4]] ^ rs_tab5[in[5]] ^ rs_tab6[in[6]] ^ rs_tab7[in[7]]; |
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229 STORE32L(tmp, out); |
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230 } |
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231 |
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232 #else /* !TWOFISH_ALL_TABLES */ |
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233 |
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234 /* computes [y0 y1 y2 y3] = RS . [x0 x1 x2 x3 x4 x5 x6 x7] */ |
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235 static void rs_mult(const unsigned char *in, unsigned char *out) |
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236 { |
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237 int x, y; |
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238 for (x = 0; x < 4; x++) { |
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239 out[x] = 0; |
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240 for (y = 0; y < 8; y++) { |
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241 out[x] ^= gf_mult(in[y], RS[x][y], RS_POLY); |
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242 } |
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243 } |
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244 } |
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245 |
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246 #endif |
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247 |
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248 /* computes h(x) */ |
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249 static void h_func(const unsigned char *in, unsigned char *out, unsigned char *M, int k, int offset) |
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250 { |
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251 int x; |
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252 unsigned char y[4]; |
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253 for (x = 0; x < 4; x++) { |
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254 y[x] = in[x]; |
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255 } |
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256 switch (k) { |
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257 case 4: |
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258 y[0] = (unsigned char)(sbox(1, (ulong32)y[0]) ^ M[4 * (6 + offset) + 0]); |
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259 y[1] = (unsigned char)(sbox(0, (ulong32)y[1]) ^ M[4 * (6 + offset) + 1]); |
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260 y[2] = (unsigned char)(sbox(0, (ulong32)y[2]) ^ M[4 * (6 + offset) + 2]); |
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261 y[3] = (unsigned char)(sbox(1, (ulong32)y[3]) ^ M[4 * (6 + offset) + 3]); |
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262 case 3: |
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263 y[0] = (unsigned char)(sbox(1, (ulong32)y[0]) ^ M[4 * (4 + offset) + 0]); |
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264 y[1] = (unsigned char)(sbox(1, (ulong32)y[1]) ^ M[4 * (4 + offset) + 1]); |
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265 y[2] = (unsigned char)(sbox(0, (ulong32)y[2]) ^ M[4 * (4 + offset) + 2]); |
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266 y[3] = (unsigned char)(sbox(0, (ulong32)y[3]) ^ M[4 * (4 + offset) + 3]); |
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267 case 2: |
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268 y[0] = (unsigned char)(sbox(1, sbox(0, sbox(0, (ulong32)y[0]) ^ M[4 * (2 + offset) + 0]) ^ M[4 * (0 + offset) + 0])); |
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269 y[1] = (unsigned char)(sbox(0, sbox(0, sbox(1, (ulong32)y[1]) ^ M[4 * (2 + offset) + 1]) ^ M[4 * (0 + offset) + 1])); |
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270 y[2] = (unsigned char)(sbox(1, sbox(1, sbox(0, (ulong32)y[2]) ^ M[4 * (2 + offset) + 2]) ^ M[4 * (0 + offset) + 2])); |
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271 y[3] = (unsigned char)(sbox(0, sbox(1, sbox(1, (ulong32)y[3]) ^ M[4 * (2 + offset) + 3]) ^ M[4 * (0 + offset) + 3])); |
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272 } |
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273 mds_mult(y, out); |
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274 } |
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275 |
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276 #ifndef TWOFISH_SMALL |
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277 |
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278 /* for GCC we don't use pointer aliases */ |
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279 #if defined(__GNUC__) |
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280 #define S1 skey->twofish.S[0] |
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281 #define S2 skey->twofish.S[1] |
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282 #define S3 skey->twofish.S[2] |
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283 #define S4 skey->twofish.S[3] |
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284 #endif |
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285 |
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286 /* the G function */ |
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287 #define g_func(x, dum) (S1[byte(x,0)] ^ S2[byte(x,1)] ^ S3[byte(x,2)] ^ S4[byte(x,3)]) |
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288 #define g1_func(x, dum) (S2[byte(x,0)] ^ S3[byte(x,1)] ^ S4[byte(x,2)] ^ S1[byte(x,3)]) |
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289 |
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290 #else |
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291 |
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292 #ifdef LTC_CLEAN_STACK |
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293 static ulong32 _g_func(ulong32 x, symmetric_key *key) |
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294 #else |
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295 static ulong32 g_func(ulong32 x, symmetric_key *key) |
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296 #endif |
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297 { |
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298 unsigned char g, i, y, z; |
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299 ulong32 res; |
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300 |
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301 res = 0; |
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302 for (y = 0; y < 4; y++) { |
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303 z = key->twofish.start; |
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304 |
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305 /* do unkeyed substitution */ |
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306 g = sbox(qord[y][z++], (x >> (8*y)) & 255); |
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307 |
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308 /* first subkey */ |
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309 i = 0; |
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310 |
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311 /* do key mixing+sbox until z==5 */ |
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312 while (z != 5) { |
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313 g = g ^ key->twofish.S[4*i++ + y]; |
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314 g = sbox(qord[y][z++], g); |
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315 } |
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316 |
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317 /* multiply g by a column of the MDS */ |
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318 res ^= mds_column_mult(g, y); |
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319 } |
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320 return res; |
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321 } |
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322 |
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323 #define g1_func(x, key) g_func(ROLc(x, 8), key) |
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324 |
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325 #ifdef LTC_CLEAN_STACK |
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326 static ulong32 g_func(ulong32 x, symmetric_key *key) |
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327 { |
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328 ulong32 y; |
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329 y = _g_func(x, key); |
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330 burn_stack(sizeof(unsigned char) * 4 + sizeof(ulong32)); |
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331 return y; |
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332 } |
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333 #endif /* LTC_CLEAN_STACK */ |
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334 |
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335 #endif /* TWOFISH_SMALL */ |
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336 |
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337 /** |
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338 Initialize the Twofish block cipher |
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339 @param key The symmetric key you wish to pass |
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340 @param keylen The key length in bytes |
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341 @param num_rounds The number of rounds desired (0 for default) |
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342 @param skey The key in as scheduled by this function. |
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343 @return CRYPT_OK if successful |
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344 */ |
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345 #ifdef LTC_CLEAN_STACK |
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346 static int _twofish_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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347 #else |
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348 int twofish_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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349 #endif |
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350 { |
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351 #ifndef TWOFISH_SMALL |
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352 unsigned char S[4*4], tmpx0, tmpx1; |
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353 #endif |
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354 int k, x, y; |
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355 unsigned char tmp[4], tmp2[4], M[8*4]; |
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356 ulong32 A, B; |
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357 |
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358 LTC_ARGCHK(key != NULL); |
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359 LTC_ARGCHK(skey != NULL); |
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360 |
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361 /* invalid arguments? */ |
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362 if (num_rounds != 16 && num_rounds != 0) { |
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363 return CRYPT_INVALID_ROUNDS; |
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364 } |
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365 |
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366 if (keylen != 16 && keylen != 24 && keylen != 32) { |
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367 return CRYPT_INVALID_KEYSIZE; |
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368 } |
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369 |
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370 /* k = keysize/64 [but since our keysize is in bytes...] */ |
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371 k = keylen / 8; |
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372 |
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373 /* copy the key into M */ |
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374 for (x = 0; x < keylen; x++) { |
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375 M[x] = key[x] & 255; |
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376 } |
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377 |
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378 /* create the S[..] words */ |
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379 #ifndef TWOFISH_SMALL |
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380 for (x = 0; x < k; x++) { |
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381 rs_mult(M+(x*8), S+(x*4)); |
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382 } |
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383 #else |
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384 for (x = 0; x < k; x++) { |
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385 rs_mult(M+(x*8), skey->twofish.S+(x*4)); |
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386 } |
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387 #endif |
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388 |
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389 /* make subkeys */ |
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390 for (x = 0; x < 20; x++) { |
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391 /* A = h(p * 2x, Me) */ |
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392 for (y = 0; y < 4; y++) { |
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393 tmp[y] = x+x; |
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394 } |
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395 h_func(tmp, tmp2, M, k, 0); |
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396 LOAD32L(A, tmp2); |
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397 |
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
398 /* B = ROL(h(p * (2x + 1), Mo), 8) */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
399 for (y = 0; y < 4; y++) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
400 tmp[y] = (unsigned char)(x+x+1); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
401 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
402 h_func(tmp, tmp2, M, k, 1); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
403 LOAD32L(B, tmp2); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
404 B = ROLc(B, 8); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
405 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
406 /* K[2i] = A + B */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
407 skey->twofish.K[x+x] = (A + B) & 0xFFFFFFFFUL; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
408 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
409 /* K[2i+1] = (A + 2B) <<< 9 */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
410 skey->twofish.K[x+x+1] = ROLc(B + B + A, 9); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
411 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
412 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
413 #ifndef TWOFISH_SMALL |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
414 /* make the sboxes (large ram variant) */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
415 if (k == 2) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
416 for (x = 0; x < 256; x++) { |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
417 tmpx0 = (unsigned char)sbox(0, x); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
418 tmpx1 = (unsigned char)sbox(1, x); |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
419 skey->twofish.S[0][x] = mds_column_mult(sbox(1, (sbox(0, tmpx0 ^ S[0]) ^ S[4])),0); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
420 skey->twofish.S[1][x] = mds_column_mult(sbox(0, (sbox(0, tmpx1 ^ S[1]) ^ S[5])),1); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
421 skey->twofish.S[2][x] = mds_column_mult(sbox(1, (sbox(1, tmpx0 ^ S[2]) ^ S[6])),2); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
422 skey->twofish.S[3][x] = mds_column_mult(sbox(0, (sbox(1, tmpx1 ^ S[3]) ^ S[7])),3); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
423 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
424 } else if (k == 3) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
425 for (x = 0; x < 256; x++) { |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
426 tmpx0 = (unsigned char)sbox(0, x); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
427 tmpx1 = (unsigned char)sbox(1, x); |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
428 skey->twofish.S[0][x] = mds_column_mult(sbox(1, (sbox(0, sbox(0, tmpx1 ^ S[0]) ^ S[4]) ^ S[8])),0); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
429 skey->twofish.S[1][x] = mds_column_mult(sbox(0, (sbox(0, sbox(1, tmpx1 ^ S[1]) ^ S[5]) ^ S[9])),1); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
430 skey->twofish.S[2][x] = mds_column_mult(sbox(1, (sbox(1, sbox(0, tmpx0 ^ S[2]) ^ S[6]) ^ S[10])),2); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
431 skey->twofish.S[3][x] = mds_column_mult(sbox(0, (sbox(1, sbox(1, tmpx0 ^ S[3]) ^ S[7]) ^ S[11])),3); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
432 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
433 } else { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
434 for (x = 0; x < 256; x++) { |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
435 tmpx0 = (unsigned char)sbox(0, x); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
436 tmpx1 = (unsigned char)sbox(1, x); |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
437 skey->twofish.S[0][x] = mds_column_mult(sbox(1, (sbox(0, sbox(0, sbox(1, tmpx1 ^ S[0]) ^ S[4]) ^ S[8]) ^ S[12])),0); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
438 skey->twofish.S[1][x] = mds_column_mult(sbox(0, (sbox(0, sbox(1, sbox(1, tmpx0 ^ S[1]) ^ S[5]) ^ S[9]) ^ S[13])),1); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
439 skey->twofish.S[2][x] = mds_column_mult(sbox(1, (sbox(1, sbox(0, sbox(0, tmpx0 ^ S[2]) ^ S[6]) ^ S[10]) ^ S[14])),2); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
440 skey->twofish.S[3][x] = mds_column_mult(sbox(0, (sbox(1, sbox(1, sbox(0, tmpx1 ^ S[3]) ^ S[7]) ^ S[11]) ^ S[15])),3); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
441 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
442 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
443 #else |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
444 /* where to start in the sbox layers */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
445 /* small ram variant */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
446 switch (k) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
447 case 4 : skey->twofish.start = 0; break; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
448 case 3 : skey->twofish.start = 1; break; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
449 default: skey->twofish.start = 2; break; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
450 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
451 #endif |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
452 return CRYPT_OK; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
453 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
454 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
455 #ifdef LTC_CLEAN_STACK |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
456 int twofish_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
457 { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
458 int x; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
459 x = _twofish_setup(key, keylen, num_rounds, skey); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
460 burn_stack(sizeof(int) * 7 + sizeof(unsigned char) * 56 + sizeof(ulong32) * 2); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
461 return x; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
462 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
463 #endif |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
464 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
465 /** |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
466 Encrypts a block of text with Twofish |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
467 @param pt The input plaintext (16 bytes) |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
468 @param ct The output ciphertext (16 bytes) |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
469 @param skey The key as scheduled |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
470 @return CRYPT_OK if successful |
285
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
471 */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
472 #ifdef LTC_CLEAN_STACK |
382
0cbe8f6dbf9e
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473 static int _twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
285
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474 #else |
382
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475 int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
285
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476 #endif |
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parents:
diff
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477 { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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478 ulong32 a,b,c,d,ta,tb,tc,td,t1,t2, *k; |
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479 int r; |
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480 #if !defined(TWOFISH_SMALL) && !defined(__GNUC__) |
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481 ulong32 *S1, *S2, *S3, *S4; |
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482 #endif |
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483 |
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484 LTC_ARGCHK(pt != NULL); |
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485 LTC_ARGCHK(ct != NULL); |
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486 LTC_ARGCHK(skey != NULL); |
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487 |
1b9e69c058d2
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488 #if !defined(TWOFISH_SMALL) && !defined(__GNUC__) |
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Matt Johnston <matt@ucc.asn.au>
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489 S1 = skey->twofish.S[0]; |
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490 S2 = skey->twofish.S[1]; |
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491 S3 = skey->twofish.S[2]; |
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492 S4 = skey->twofish.S[3]; |
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493 #endif |
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494 |
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495 LOAD32L(a,&pt[0]); LOAD32L(b,&pt[4]); |
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496 LOAD32L(c,&pt[8]); LOAD32L(d,&pt[12]); |
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497 a ^= skey->twofish.K[0]; |
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498 b ^= skey->twofish.K[1]; |
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499 c ^= skey->twofish.K[2]; |
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Matt Johnston <matt@ucc.asn.au>
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500 d ^= skey->twofish.K[3]; |
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501 |
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502 k = skey->twofish.K + 8; |
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503 for (r = 8; r != 0; --r) { |
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Matt Johnston <matt@ucc.asn.au>
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504 t2 = g1_func(b, skey); |
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505 t1 = g_func(a, skey) + t2; |
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506 c = RORc(c ^ (t1 + k[0]), 1); |
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507 d = ROLc(d, 1) ^ (t2 + t1 + k[1]); |
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508 |
1b9e69c058d2
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509 t2 = g1_func(d, skey); |
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510 t1 = g_func(c, skey) + t2; |
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511 a = RORc(a ^ (t1 + k[2]), 1); |
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512 b = ROLc(b, 1) ^ (t2 + t1 + k[3]); |
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513 k += 4; |
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514 } |
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515 |
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516 /* output with "undo last swap" */ |
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517 ta = c ^ skey->twofish.K[4]; |
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518 tb = d ^ skey->twofish.K[5]; |
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519 tc = a ^ skey->twofish.K[6]; |
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520 td = b ^ skey->twofish.K[7]; |
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521 |
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522 /* store output */ |
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523 STORE32L(ta,&ct[0]); STORE32L(tb,&ct[4]); |
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524 STORE32L(tc,&ct[8]); STORE32L(td,&ct[12]); |
382
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525 |
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526 return CRYPT_OK; |
285
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527 } |
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528 |
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Matt Johnston <matt@ucc.asn.au>
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529 #ifdef LTC_CLEAN_STACK |
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530 int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
285
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|
531 { |
382
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diff
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532 int err = _twofish_ecb_encrypt(pt, ct, skey); |
285
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533 burn_stack(sizeof(ulong32) * 10 + sizeof(int)); |
382
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534 return err; |
285
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|
535 } |
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|
536 #endif |
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parents:
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|
537 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
538 /** |
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
539 Decrypts a block of text with Twofish |
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
540 @param ct The input ciphertext (16 bytes) |
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
541 @param pt The output plaintext (16 bytes) |
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|
542 @param skey The key as scheduled |
382
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diff
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|
543 @return CRYPT_OK if successful |
285
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Matt Johnston <matt@ucc.asn.au>
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|
544 */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
545 #ifdef LTC_CLEAN_STACK |
382
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diff
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|
546 static int _twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
285
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
547 #else |
382
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Matt Johnston <matt@ucc.asn.au>
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diff
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548 int twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
285
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|
549 #endif |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
550 { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
551 ulong32 a,b,c,d,ta,tb,tc,td,t1,t2, *k; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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552 int r; |
1b9e69c058d2
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|
553 #if !defined(TWOFISH_SMALL) && !defined(__GNUC__) |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
554 ulong32 *S1, *S2, *S3, *S4; |
1b9e69c058d2
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parents:
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|
555 #endif |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
556 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
557 LTC_ARGCHK(pt != NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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558 LTC_ARGCHK(ct != NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
559 LTC_ARGCHK(skey != NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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560 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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561 #if !defined(TWOFISH_SMALL) && !defined(__GNUC__) |
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Matt Johnston <matt@ucc.asn.au>
parents:
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562 S1 = skey->twofish.S[0]; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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563 S2 = skey->twofish.S[1]; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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564 S3 = skey->twofish.S[2]; |
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Matt Johnston <matt@ucc.asn.au>
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565 S4 = skey->twofish.S[3]; |
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Matt Johnston <matt@ucc.asn.au>
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566 #endif |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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567 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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568 /* load input */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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569 LOAD32L(ta,&ct[0]); LOAD32L(tb,&ct[4]); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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570 LOAD32L(tc,&ct[8]); LOAD32L(td,&ct[12]); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
571 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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572 /* undo undo final swap */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
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573 a = tc ^ skey->twofish.K[6]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
574 b = td ^ skey->twofish.K[7]; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
575 c = ta ^ skey->twofish.K[4]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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576 d = tb ^ skey->twofish.K[5]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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577 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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578 k = skey->twofish.K + 36; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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579 for (r = 8; r != 0; --r) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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580 t2 = g1_func(d, skey); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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581 t1 = g_func(c, skey) + t2; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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582 a = ROLc(a, 1) ^ (t1 + k[2]); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
583 b = RORc(b ^ (t2 + t1 + k[3]), 1); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
584 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
585 t2 = g1_func(b, skey); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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586 t1 = g_func(a, skey) + t2; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
587 c = ROLc(c, 1) ^ (t1 + k[0]); |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
588 d = RORc(d ^ (t2 + t1 + k[1]), 1); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
589 k -= 4; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
590 } |
1b9e69c058d2
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parents:
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|
591 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
592 /* pre-white */ |
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Matt Johnston <matt@ucc.asn.au>
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|
593 a ^= skey->twofish.K[0]; |
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
594 b ^= skey->twofish.K[1]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
595 c ^= skey->twofish.K[2]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
596 d ^= skey->twofish.K[3]; |
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Matt Johnston <matt@ucc.asn.au>
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|
597 |
1b9e69c058d2
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|
598 /* store */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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599 STORE32L(a, &pt[0]); STORE32L(b, &pt[4]); |
1b9e69c058d2
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parents:
diff
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600 STORE32L(c, &pt[8]); STORE32L(d, &pt[12]); |
382
0cbe8f6dbf9e
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285
diff
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|
601 return CRYPT_OK; |
285
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
602 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
603 |
1b9e69c058d2
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|
604 #ifdef LTC_CLEAN_STACK |
382
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Matt Johnston <matt@ucc.asn.au>
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285
diff
changeset
|
605 int twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
285
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Matt Johnston <matt@ucc.asn.au>
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|
606 { |
382
0cbe8f6dbf9e
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285
diff
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|
607 int err =_twofish_ecb_decrypt(ct, pt, skey); |
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
608 burn_stack(sizeof(ulong32) * 10 + sizeof(int)); |
382
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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285
diff
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|
609 return err; |
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
610 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
611 #endif |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
612 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
613 /** |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
614 Performs a self-test of the Twofish block cipher |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
615 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
616 */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
617 int twofish_test(void) |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
618 { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
619 #ifndef LTC_TEST |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
620 return CRYPT_NOP; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
621 #else |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
622 static const struct { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
623 int keylen; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
624 unsigned char key[32], pt[16], ct[16]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
625 } tests[] = { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
626 { 16, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
627 { 0x9F, 0x58, 0x9F, 0x5C, 0xF6, 0x12, 0x2C, 0x32, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
628 0xB6, 0xBF, 0xEC, 0x2F, 0x2A, 0xE8, 0xC3, 0x5A }, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
629 { 0xD4, 0x91, 0xDB, 0x16, 0xE7, 0xB1, 0xC3, 0x9E, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
630 0x86, 0xCB, 0x08, 0x6B, 0x78, 0x9F, 0x54, 0x19 }, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
631 { 0x01, 0x9F, 0x98, 0x09, 0xDE, 0x17, 0x11, 0x85, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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632 0x8F, 0xAA, 0xC3, 0xA3, 0xBA, 0x20, 0xFB, 0xC3 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
633 }, { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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634 24, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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635 { 0x88, 0xB2, 0xB2, 0x70, 0x6B, 0x10, 0x5E, 0x36, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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636 0xB4, 0x46, 0xBB, 0x6D, 0x73, 0x1A, 0x1E, 0x88, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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637 0xEF, 0xA7, 0x1F, 0x78, 0x89, 0x65, 0xBD, 0x44 }, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff
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|
638 { 0x39, 0xDA, 0x69, 0xD6, 0xBA, 0x49, 0x97, 0xD5, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff
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639 0x85, 0xB6, 0xDC, 0x07, 0x3C, 0xA3, 0x41, 0xB2 }, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
640 { 0x18, 0x2B, 0x02, 0xD8, 0x14, 0x97, 0xEA, 0x45, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff
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641 0xF9, 0xDA, 0xAC, 0xDC, 0x29, 0x19, 0x3A, 0x65 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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642 }, { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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643 32, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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644 { 0xD4, 0x3B, 0xB7, 0x55, 0x6E, 0xA3, 0x2E, 0x46, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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645 0xF2, 0xA2, 0x82, 0xB7, 0xD4, 0x5B, 0x4E, 0x0D, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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646 0x57, 0xFF, 0x73, 0x9D, 0x4D, 0xC9, 0x2C, 0x1B, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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647 0xD7, 0xFC, 0x01, 0x70, 0x0C, 0xC8, 0x21, 0x6F }, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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648 { 0x90, 0xAF, 0xE9, 0x1B, 0xB2, 0x88, 0x54, 0x4F, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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649 0x2C, 0x32, 0xDC, 0x23, 0x9B, 0x26, 0x35, 0xE6 }, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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650 { 0x6C, 0xB4, 0x56, 0x1C, 0x40, 0xBF, 0x0A, 0x97, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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651 0x05, 0x93, 0x1C, 0xB6, 0xD4, 0x08, 0xE7, 0xFA } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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652 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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653 }; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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654 |
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Matt Johnston <matt@ucc.asn.au>
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655 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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656 symmetric_key key; |
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Matt Johnston <matt@ucc.asn.au>
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657 unsigned char tmp[2][16]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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658 int err, i, y; |
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Matt Johnston <matt@ucc.asn.au>
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659 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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660 for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) { |
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Matt Johnston <matt@ucc.asn.au>
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661 if ((err = twofish_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) { |
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Matt Johnston <matt@ucc.asn.au>
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662 return err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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663 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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664 twofish_ecb_encrypt(tests[i].pt, tmp[0], &key); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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665 twofish_ecb_decrypt(tmp[0], tmp[1], &key); |
382
0cbe8f6dbf9e
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285
diff
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666 if (XMEMCMP(tmp[0], tests[i].ct, 16) != 0 || XMEMCMP(tmp[1], tests[i].pt, 16) != 0) { |
0cbe8f6dbf9e
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285
diff
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667 #if 0 |
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285
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668 printf("Twofish failed test %d, %d, %d\n", i, XMEMCMP(tmp[0], tests[i].ct, 16), XMEMCMP(tmp[1], tests[i].pt, 16)); |
0cbe8f6dbf9e
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285
diff
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669 #endif |
285
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670 return CRYPT_FAIL_TESTVECTOR; |
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671 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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672 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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673 for (y = 0; y < 16; y++) tmp[0][y] = 0; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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674 for (y = 0; y < 1000; y++) twofish_ecb_encrypt(tmp[0], tmp[0], &key); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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675 for (y = 0; y < 1000; y++) twofish_ecb_decrypt(tmp[0], tmp[0], &key); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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676 for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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677 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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678 return CRYPT_OK; |
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679 #endif |
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680 } |
1b9e69c058d2
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681 |
1b9e69c058d2
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682 /** Terminate the context |
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Matt Johnston <matt@ucc.asn.au>
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683 @param skey The scheduled key |
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684 */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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685 void twofish_done(symmetric_key *skey) |
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686 { |
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Matt Johnston <matt@ucc.asn.au>
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|
687 } |
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|
688 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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689 /** |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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690 Gets suitable key size |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
691 @param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable. |
1b9e69c058d2
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diff
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692 @return CRYPT_OK if the input key size is acceptable. |
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Matt Johnston <matt@ucc.asn.au>
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|
693 */ |
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694 int twofish_keysize(int *keysize) |
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695 { |
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696 LTC_ARGCHK(keysize); |
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697 if (*keysize < 16) |
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698 return CRYPT_INVALID_KEYSIZE; |
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Matt Johnston <matt@ucc.asn.au>
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diff
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699 if (*keysize < 24) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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700 *keysize = 16; |
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701 return CRYPT_OK; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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702 } else if (*keysize < 32) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
703 *keysize = 24; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
704 return CRYPT_OK; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
705 } else { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
706 *keysize = 32; |
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707 return CRYPT_OK; |
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708 } |
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709 } |
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710 |
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711 #endif |
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712 |
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713 |
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714 |
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parents:
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715 |
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716 /* $Source: /cvs/libtom/libtomcrypt/src/ciphers/twofish/twofish.c,v $ */ |
382
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717 /* $Revision: 1.14 $ */ |
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718 /* $Date: 2006/12/04 21:34:03 $ */ |