Mercurial > dropbear
annotate libtomcrypt/src/ciphers/noekeon.c @ 1180:1637dbd26212 DROPBEAR_2015.69
2015.69
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 25 Nov 2015 23:07:47 +0800 |
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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 @file noekeon.c |
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13 Implementation of the Noekeon block cipher by Tom St Denis |
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14 */ |
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15 #include "tomcrypt.h" |
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16 |
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17 #ifdef NOEKEON |
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18 |
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19 const struct ltc_cipher_descriptor noekeon_desc = |
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20 { |
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21 "noekeon", |
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22 16, |
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23 16, 16, 16, 16, |
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24 &noekeon_setup, |
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25 &noekeon_ecb_encrypt, |
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26 &noekeon_ecb_decrypt, |
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27 &noekeon_test, |
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28 &noekeon_done, |
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29 &noekeon_keysize, |
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30 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL |
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31 }; |
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32 |
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33 static const ulong32 RC[] = { |
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34 0x00000080UL, 0x0000001bUL, 0x00000036UL, 0x0000006cUL, |
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35 0x000000d8UL, 0x000000abUL, 0x0000004dUL, 0x0000009aUL, |
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36 0x0000002fUL, 0x0000005eUL, 0x000000bcUL, 0x00000063UL, |
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37 0x000000c6UL, 0x00000097UL, 0x00000035UL, 0x0000006aUL, |
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38 0x000000d4UL |
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39 }; |
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40 |
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41 #define kTHETA(a, b, c, d) \ |
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42 temp = a^c; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \ |
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43 b ^= temp; d ^= temp; \ |
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44 temp = b^d; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \ |
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45 a ^= temp; c ^= temp; |
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46 |
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47 #define THETA(k, a, b, c, d) \ |
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48 temp = a^c; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \ |
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49 b ^= temp ^ k[1]; d ^= temp ^ k[3]; \ |
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50 temp = b^d; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \ |
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51 a ^= temp ^ k[0]; c ^= temp ^ k[2]; |
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52 |
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53 #define GAMMA(a, b, c, d) \ |
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54 b ^= ~(d|c); \ |
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55 a ^= c&b; \ |
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56 temp = d; d = a; a = temp;\ |
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57 c ^= a ^ b ^ d; \ |
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58 b ^= ~(d|c); \ |
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59 a ^= c&b; |
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60 |
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61 #define PI1(a, b, c, d) \ |
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62 a = ROLc(a, 1); c = ROLc(c, 5); d = ROLc(d, 2); |
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63 |
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64 #define PI2(a, b, c, d) \ |
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65 a = RORc(a, 1); c = RORc(c, 5); d = RORc(d, 2); |
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66 |
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67 /** |
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68 Initialize the Noekeon block cipher |
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69 @param key The symmetric key you wish to pass |
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70 @param keylen The key length in bytes |
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71 @param num_rounds The number of rounds desired (0 for default) |
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72 @param skey The key in as scheduled by this function. |
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73 @return CRYPT_OK if successful |
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74 */ |
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75 int noekeon_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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76 { |
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77 ulong32 temp; |
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78 |
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79 LTC_ARGCHK(key != NULL); |
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80 LTC_ARGCHK(skey != NULL); |
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81 |
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82 if (keylen != 16) { |
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83 return CRYPT_INVALID_KEYSIZE; |
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84 } |
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85 |
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86 if (num_rounds != 16 && num_rounds != 0) { |
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87 return CRYPT_INVALID_ROUNDS; |
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88 } |
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89 |
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90 LOAD32H(skey->noekeon.K[0],&key[0]); |
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91 LOAD32H(skey->noekeon.K[1],&key[4]); |
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92 LOAD32H(skey->noekeon.K[2],&key[8]); |
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93 LOAD32H(skey->noekeon.K[3],&key[12]); |
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94 |
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95 LOAD32H(skey->noekeon.dK[0],&key[0]); |
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96 LOAD32H(skey->noekeon.dK[1],&key[4]); |
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97 LOAD32H(skey->noekeon.dK[2],&key[8]); |
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98 LOAD32H(skey->noekeon.dK[3],&key[12]); |
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99 |
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100 kTHETA(skey->noekeon.dK[0], skey->noekeon.dK[1], skey->noekeon.dK[2], skey->noekeon.dK[3]); |
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101 |
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102 return CRYPT_OK; |
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103 } |
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104 |
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105 /** |
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106 Encrypts a block of text with Noekeon |
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107 @param pt The input plaintext (16 bytes) |
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108 @param ct The output ciphertext (16 bytes) |
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109 @param skey The key as scheduled |
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110 @return CRYPT_OK if successful |
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111 */ |
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112 #ifdef LTC_CLEAN_STACK |
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113 static int _noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
285
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114 #else |
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115 int noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
285
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116 #endif |
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117 { |
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118 ulong32 a,b,c,d,temp; |
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119 int r; |
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120 |
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121 LTC_ARGCHK(skey != NULL); |
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122 LTC_ARGCHK(pt != NULL); |
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123 LTC_ARGCHK(ct != NULL); |
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124 |
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125 LOAD32H(a,&pt[0]); LOAD32H(b,&pt[4]); |
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126 LOAD32H(c,&pt[8]); LOAD32H(d,&pt[12]); |
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127 |
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128 #define ROUND(i) \ |
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129 a ^= RC[i]; \ |
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130 THETA(skey->noekeon.K, a,b,c,d); \ |
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131 PI1(a,b,c,d); \ |
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132 GAMMA(a,b,c,d); \ |
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133 PI2(a,b,c,d); |
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134 |
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135 for (r = 0; r < 16; ++r) { |
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136 ROUND(r); |
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137 } |
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138 |
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139 #undef ROUND |
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140 |
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141 a ^= RC[16]; |
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142 THETA(skey->noekeon.K, a, b, c, d); |
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143 |
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144 STORE32H(a,&ct[0]); STORE32H(b,&ct[4]); |
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145 STORE32H(c,&ct[8]); STORE32H(d,&ct[12]); |
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146 |
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147 return CRYPT_OK; |
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148 } |
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149 |
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150 #ifdef LTC_CLEAN_STACK |
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151 int noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
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152 { |
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153 int err = _noekeon_ecb_encrypt(pt, ct, skey); |
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154 burn_stack(sizeof(ulong32) * 5 + sizeof(int)); |
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155 return CRYPT_OK; |
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156 } |
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157 #endif |
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158 |
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159 /** |
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160 Decrypts a block of text with Noekeon |
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161 @param ct The input ciphertext (16 bytes) |
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162 @param pt The output plaintext (16 bytes) |
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163 @param skey The key as scheduled |
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164 @return CRYPT_OK if successful |
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165 */ |
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166 #ifdef LTC_CLEAN_STACK |
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167 static int _noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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168 #else |
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169 int noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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170 #endif |
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171 { |
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172 ulong32 a,b,c,d, temp; |
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173 int r; |
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174 |
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175 LTC_ARGCHK(skey != NULL); |
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176 LTC_ARGCHK(pt != NULL); |
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177 LTC_ARGCHK(ct != NULL); |
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178 |
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179 LOAD32H(a,&ct[0]); LOAD32H(b,&ct[4]); |
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180 LOAD32H(c,&ct[8]); LOAD32H(d,&ct[12]); |
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181 |
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182 |
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183 #define ROUND(i) \ |
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184 THETA(skey->noekeon.dK, a,b,c,d); \ |
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185 a ^= RC[i]; \ |
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186 PI1(a,b,c,d); \ |
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187 GAMMA(a,b,c,d); \ |
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188 PI2(a,b,c,d); |
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189 |
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190 for (r = 16; r > 0; --r) { |
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191 ROUND(r); |
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192 } |
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193 |
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194 #undef ROUND |
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195 |
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196 THETA(skey->noekeon.dK, a,b,c,d); |
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197 a ^= RC[0]; |
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198 STORE32H(a,&pt[0]); STORE32H(b, &pt[4]); |
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199 STORE32H(c,&pt[8]); STORE32H(d, &pt[12]); |
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200 return CRYPT_OK; |
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201 } |
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202 |
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203 #ifdef LTC_CLEAN_STACK |
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204 int noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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205 { |
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206 int err = _noekeon_ecb_decrypt(ct, pt, skey); |
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207 burn_stack(sizeof(ulong32) * 5 + sizeof(int)); |
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208 return err; |
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209 } |
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210 #endif |
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211 |
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212 /** |
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213 Performs a self-test of the Noekeon block cipher |
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214 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled |
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215 */ |
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216 int noekeon_test(void) |
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217 { |
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218 #ifndef LTC_TEST |
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219 return CRYPT_NOP; |
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220 #else |
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221 static const struct { |
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222 int keylen; |
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223 unsigned char key[16], pt[16], ct[16]; |
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224 } tests[] = { |
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225 { |
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226 16, |
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227 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, |
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228 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, |
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229 { 0x18, 0xa6, 0xec, 0xe5, 0x28, 0xaa, 0x79, 0x73, |
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230 0x28, 0xb2, 0xc0, 0x91, 0xa0, 0x2f, 0x54, 0xc5} |
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231 } |
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232 }; |
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233 symmetric_key key; |
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234 unsigned char tmp[2][16]; |
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235 int err, i, y; |
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236 |
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237 for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) { |
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238 zeromem(&key, sizeof(key)); |
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239 if ((err = noekeon_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) { |
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240 return err; |
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241 } |
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242 |
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243 noekeon_ecb_encrypt(tests[i].pt, tmp[0], &key); |
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244 noekeon_ecb_decrypt(tmp[0], tmp[1], &key); |
382
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245 if (XMEMCMP(tmp[0], tests[i].ct, 16) || XMEMCMP(tmp[1], tests[i].pt, 16)) { |
285
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246 #if 0 |
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247 printf("\n\nTest %d failed\n", i); |
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248 if (XMEMCMP(tmp[0], tests[i].ct, 16)) { |
285
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249 printf("CT: "); |
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250 for (i = 0; i < 16; i++) { |
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251 printf("%02x ", tmp[0][i]); |
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252 } |
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253 printf("\n"); |
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254 } else { |
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255 printf("PT: "); |
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256 for (i = 0; i < 16; i++) { |
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257 printf("%02x ", tmp[1][i]); |
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258 } |
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259 printf("\n"); |
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260 } |
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261 #endif |
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262 return CRYPT_FAIL_TESTVECTOR; |
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263 } |
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264 |
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265 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */ |
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266 for (y = 0; y < 16; y++) tmp[0][y] = 0; |
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267 for (y = 0; y < 1000; y++) noekeon_ecb_encrypt(tmp[0], tmp[0], &key); |
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268 for (y = 0; y < 1000; y++) noekeon_ecb_decrypt(tmp[0], tmp[0], &key); |
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269 for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; |
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270 } |
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271 return CRYPT_OK; |
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272 #endif |
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273 } |
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274 |
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275 /** Terminate the context |
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276 @param skey The scheduled key |
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277 */ |
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278 void noekeon_done(symmetric_key *skey) |
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279 { |
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280 } |
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281 |
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282 /** |
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283 Gets suitable key size |
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284 @param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable. |
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285 @return CRYPT_OK if the input key size is acceptable. |
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286 */ |
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287 int noekeon_keysize(int *keysize) |
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288 { |
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289 LTC_ARGCHK(keysize != NULL); |
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290 if (*keysize < 16) { |
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291 return CRYPT_INVALID_KEYSIZE; |
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292 } else { |
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293 *keysize = 16; |
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294 return CRYPT_OK; |
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295 } |
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296 } |
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297 |
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298 #endif |
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299 |
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300 |
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301 /* $Source: /cvs/libtom/libtomcrypt/src/ciphers/noekeon.c,v $ */ |
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302 /* $Revision: 1.12 $ */ |
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303 /* $Date: 2006/11/08 23:01:06 $ */ |