Mercurial > dropbear
annotate libtomcrypt/src/ciphers/rc6.c @ 936:d93a6bcf616f
Improve handling lots of concurrent forwarded connections. Increase
connection backlog, avoid check_close() for channels that haven't had IO
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 25 Jun 2014 23:42:39 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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 rc6.c |
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14 RC6 code 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 RC6 |
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19 |
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20 const struct ltc_cipher_descriptor rc6_desc = |
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21 { |
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22 "rc6", |
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23 3, |
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24 8, 128, 16, 20, |
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25 &rc6_setup, |
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26 &rc6_ecb_encrypt, |
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27 &rc6_ecb_decrypt, |
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28 &rc6_test, |
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29 &rc6_done, |
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30 &rc6_keysize, |
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31 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL |
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32 }; |
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33 |
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34 static const ulong32 stab[44] = { |
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35 0xb7e15163UL, 0x5618cb1cUL, 0xf45044d5UL, 0x9287be8eUL, 0x30bf3847UL, 0xcef6b200UL, 0x6d2e2bb9UL, 0x0b65a572UL, |
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36 0xa99d1f2bUL, 0x47d498e4UL, 0xe60c129dUL, 0x84438c56UL, 0x227b060fUL, 0xc0b27fc8UL, 0x5ee9f981UL, 0xfd21733aUL, |
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37 0x9b58ecf3UL, 0x399066acUL, 0xd7c7e065UL, 0x75ff5a1eUL, 0x1436d3d7UL, 0xb26e4d90UL, 0x50a5c749UL, 0xeedd4102UL, |
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38 0x8d14babbUL, 0x2b4c3474UL, 0xc983ae2dUL, 0x67bb27e6UL, 0x05f2a19fUL, 0xa42a1b58UL, 0x42619511UL, 0xe0990ecaUL, |
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39 0x7ed08883UL, 0x1d08023cUL, 0xbb3f7bf5UL, 0x5976f5aeUL, 0xf7ae6f67UL, 0x95e5e920UL, 0x341d62d9UL, 0xd254dc92UL, |
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40 0x708c564bUL, 0x0ec3d004UL, 0xacfb49bdUL, 0x4b32c376UL }; |
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41 |
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42 /** |
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43 Initialize the RC6 block cipher |
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44 @param key The symmetric key you wish to pass |
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45 @param keylen The key length in bytes |
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46 @param num_rounds The number of rounds desired (0 for default) |
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47 @param skey The key in as scheduled by this function. |
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48 @return CRYPT_OK if successful |
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49 */ |
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50 #ifdef LTC_CLEAN_STACK |
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51 static int _rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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52 #else |
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53 int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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54 #endif |
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55 { |
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56 ulong32 L[64], S[50], A, B, i, j, v, s, l; |
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57 |
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58 LTC_ARGCHK(key != NULL); |
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59 LTC_ARGCHK(skey != NULL); |
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60 |
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61 /* test parameters */ |
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62 if (num_rounds != 0 && num_rounds != 20) { |
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63 return CRYPT_INVALID_ROUNDS; |
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64 } |
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65 |
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66 /* key must be between 64 and 1024 bits */ |
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67 if (keylen < 8 || keylen > 128) { |
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68 return CRYPT_INVALID_KEYSIZE; |
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69 } |
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70 |
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71 /* copy the key into the L array */ |
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72 for (A = i = j = 0; i < (ulong32)keylen; ) { |
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73 A = (A << 8) | ((ulong32)(key[i++] & 255)); |
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74 if (!(i & 3)) { |
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75 L[j++] = BSWAP(A); |
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76 A = 0; |
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77 } |
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78 } |
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79 |
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80 /* handle odd sized keys */ |
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81 if (keylen & 3) { |
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82 A <<= (8 * (4 - (keylen&3))); |
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83 L[j++] = BSWAP(A); |
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84 } |
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85 |
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86 /* setup the S array */ |
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87 XMEMCPY(S, stab, 44 * sizeof(stab[0])); |
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88 |
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89 /* mix buffer */ |
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90 s = 3 * MAX(44, j); |
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91 l = j; |
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92 for (A = B = i = j = v = 0; v < s; v++) { |
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93 A = S[i] = ROLc(S[i] + A + B, 3); |
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94 B = L[j] = ROL(L[j] + A + B, (A+B)); |
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95 if (++i == 44) { i = 0; } |
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96 if (++j == l) { j = 0; } |
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97 } |
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98 |
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99 /* copy to key */ |
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100 for (i = 0; i < 44; i++) { |
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101 skey->rc6.K[i] = S[i]; |
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102 } |
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103 return CRYPT_OK; |
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104 } |
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105 |
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106 #ifdef LTC_CLEAN_STACK |
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107 int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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108 { |
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109 int x; |
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110 x = _rc6_setup(key, keylen, num_rounds, skey); |
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111 burn_stack(sizeof(ulong32) * 122); |
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112 return x; |
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113 } |
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114 #endif |
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115 |
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116 /** |
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117 Encrypts a block of text with RC6 |
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118 @param pt The input plaintext (16 bytes) |
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119 @param ct The output ciphertext (16 bytes) |
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120 @param skey The key as scheduled |
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121 */ |
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122 #ifdef LTC_CLEAN_STACK |
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123 static int _rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
285
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124 #else |
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125 int rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
285
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126 #endif |
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127 { |
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128 ulong32 a,b,c,d,t,u, *K; |
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129 int r; |
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130 |
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131 LTC_ARGCHK(skey != NULL); |
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132 LTC_ARGCHK(pt != NULL); |
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133 LTC_ARGCHK(ct != NULL); |
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134 LOAD32L(a,&pt[0]);LOAD32L(b,&pt[4]);LOAD32L(c,&pt[8]);LOAD32L(d,&pt[12]); |
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135 |
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136 b += skey->rc6.K[0]; |
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137 d += skey->rc6.K[1]; |
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138 |
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139 #define RND(a,b,c,d) \ |
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140 t = (b * (b + b + 1)); t = ROLc(t, 5); \ |
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141 u = (d * (d + d + 1)); u = ROLc(u, 5); \ |
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142 a = ROL(a^t,u) + K[0]; \ |
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143 c = ROL(c^u,t) + K[1]; K += 2; |
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144 |
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145 K = skey->rc6.K + 2; |
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146 for (r = 0; r < 20; r += 4) { |
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147 RND(a,b,c,d); |
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148 RND(b,c,d,a); |
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149 RND(c,d,a,b); |
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150 RND(d,a,b,c); |
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151 } |
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152 |
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153 #undef RND |
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154 |
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155 a += skey->rc6.K[42]; |
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156 c += skey->rc6.K[43]; |
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157 STORE32L(a,&ct[0]);STORE32L(b,&ct[4]);STORE32L(c,&ct[8]);STORE32L(d,&ct[12]); |
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158 return CRYPT_OK; |
285
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159 } |
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160 |
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161 #ifdef LTC_CLEAN_STACK |
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162 int rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
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163 { |
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164 int err = _rc6_ecb_encrypt(pt, ct, skey); |
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165 burn_stack(sizeof(ulong32) * 6 + sizeof(int)); |
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166 return err; |
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167 } |
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168 #endif |
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169 |
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170 /** |
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171 Decrypts a block of text with RC6 |
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172 @param ct The input ciphertext (16 bytes) |
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173 @param pt The output plaintext (16 bytes) |
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174 @param skey The key as scheduled |
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175 */ |
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176 #ifdef LTC_CLEAN_STACK |
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177 static int _rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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178 #else |
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179 int rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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180 #endif |
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181 { |
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182 ulong32 a,b,c,d,t,u, *K; |
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183 int r; |
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184 |
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185 LTC_ARGCHK(skey != NULL); |
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186 LTC_ARGCHK(pt != NULL); |
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187 LTC_ARGCHK(ct != NULL); |
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188 |
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189 LOAD32L(a,&ct[0]);LOAD32L(b,&ct[4]);LOAD32L(c,&ct[8]);LOAD32L(d,&ct[12]); |
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190 a -= skey->rc6.K[42]; |
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191 c -= skey->rc6.K[43]; |
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192 |
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193 #define RND(a,b,c,d) \ |
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194 t = (b * (b + b + 1)); t = ROLc(t, 5); \ |
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195 u = (d * (d + d + 1)); u = ROLc(u, 5); \ |
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196 c = ROR(c - K[1], t) ^ u; \ |
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197 a = ROR(a - K[0], u) ^ t; K -= 2; |
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198 |
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199 K = skey->rc6.K + 40; |
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200 |
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201 for (r = 0; r < 20; r += 4) { |
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202 RND(d,a,b,c); |
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203 RND(c,d,a,b); |
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204 RND(b,c,d,a); |
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205 RND(a,b,c,d); |
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206 } |
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207 |
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208 #undef RND |
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209 |
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210 b -= skey->rc6.K[0]; |
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211 d -= skey->rc6.K[1]; |
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212 STORE32L(a,&pt[0]);STORE32L(b,&pt[4]);STORE32L(c,&pt[8]);STORE32L(d,&pt[12]); |
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213 |
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214 return CRYPT_OK; |
285
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215 } |
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216 |
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217 #ifdef LTC_CLEAN_STACK |
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218 int rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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219 { |
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220 int err = _rc6_ecb_decrypt(ct, pt, skey); |
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221 burn_stack(sizeof(ulong32) * 6 + sizeof(int)); |
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222 return err; |
285
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223 } |
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224 #endif |
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225 |
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226 /** |
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227 Performs a self-test of the RC6 block cipher |
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228 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled |
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229 */ |
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230 int rc6_test(void) |
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231 { |
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232 #ifndef LTC_TEST |
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233 return CRYPT_NOP; |
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234 #else |
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235 static const struct { |
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236 int keylen; |
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237 unsigned char key[32], pt[16], ct[16]; |
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238 } tests[] = { |
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239 { |
1b9e69c058d2
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240 16, |
1b9e69c058d2
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241 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, |
1b9e69c058d2
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242 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, |
1b9e69c058d2
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243 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1b9e69c058d2
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244 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
1b9e69c058d2
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245 { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79, |
1b9e69c058d2
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246 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 }, |
1b9e69c058d2
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247 { 0x52, 0x4e, 0x19, 0x2f, 0x47, 0x15, 0xc6, 0x23, |
1b9e69c058d2
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248 0x1f, 0x51, 0xf6, 0x36, 0x7e, 0xa4, 0x3f, 0x18 } |
1b9e69c058d2
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249 }, |
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250 { |
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251 24, |
1b9e69c058d2
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252 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, |
1b9e69c058d2
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253 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, |
1b9e69c058d2
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254 0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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255 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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256 { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79, |
1b9e69c058d2
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257 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 }, |
1b9e69c058d2
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258 { 0x68, 0x83, 0x29, 0xd0, 0x19, 0xe5, 0x05, 0x04, |
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259 0x1e, 0x52, 0xe9, 0x2a, 0xf9, 0x52, 0x91, 0xd4 } |
1b9e69c058d2
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260 }, |
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261 { |
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262 32, |
1b9e69c058d2
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263 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, |
1b9e69c058d2
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264 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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265 0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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266 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe }, |
1b9e69c058d2
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267 { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79, |
1b9e69c058d2
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268 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 }, |
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269 { 0xc8, 0x24, 0x18, 0x16, 0xf0, 0xd7, 0xe4, 0x89, |
1b9e69c058d2
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270 0x20, 0xad, 0x16, 0xa1, 0x67, 0x4e, 0x5d, 0x48 } |
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271 } |
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272 }; |
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273 unsigned char tmp[2][16]; |
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274 int x, y, err; |
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275 symmetric_key key; |
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276 |
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277 for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) { |
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278 /* setup key */ |
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279 if ((err = rc6_setup(tests[x].key, tests[x].keylen, 0, &key)) != CRYPT_OK) { |
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280 return err; |
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281 } |
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282 |
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283 /* encrypt and decrypt */ |
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284 rc6_ecb_encrypt(tests[x].pt, tmp[0], &key); |
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285 rc6_ecb_decrypt(tmp[0], tmp[1], &key); |
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286 |
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287 /* compare */ |
382
0cbe8f6dbf9e
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285
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288 if (XMEMCMP(tmp[0], tests[x].ct, 16) || XMEMCMP(tmp[1], tests[x].pt, 16)) { |
285
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289 #if 0 |
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290 printf("\n\nFailed test %d\n", x); |
382
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285
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291 if (XMEMCMP(tmp[0], tests[x].ct, 16)) { |
285
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292 printf("Ciphertext: "); |
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293 for (y = 0; y < 16; y++) printf("%02x ", tmp[0][y]); |
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294 printf("\nExpected : "); |
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295 for (y = 0; y < 16; y++) printf("%02x ", tests[x].ct[y]); |
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296 printf("\n"); |
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297 } |
382
0cbe8f6dbf9e
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285
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298 if (XMEMCMP(tmp[1], tests[x].pt, 16)) { |
285
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299 printf("Plaintext: "); |
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300 for (y = 0; y < 16; y++) printf("%02x ", tmp[0][y]); |
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301 printf("\nExpected : "); |
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302 for (y = 0; y < 16; y++) printf("%02x ", tests[x].pt[y]); |
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303 printf("\n"); |
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304 } |
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305 #endif |
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306 return CRYPT_FAIL_TESTVECTOR; |
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307 } |
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308 |
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309 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */ |
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310 for (y = 0; y < 16; y++) tmp[0][y] = 0; |
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311 for (y = 0; y < 1000; y++) rc6_ecb_encrypt(tmp[0], tmp[0], &key); |
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312 for (y = 0; y < 1000; y++) rc6_ecb_decrypt(tmp[0], tmp[0], &key); |
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313 for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; |
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314 } |
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315 return CRYPT_OK; |
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316 #endif |
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317 } |
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318 |
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319 /** Terminate the context |
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320 @param skey The scheduled key |
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321 */ |
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322 void rc6_done(symmetric_key *skey) |
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323 { |
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324 } |
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325 |
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326 /** |
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327 Gets suitable key size |
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328 @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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329 @return CRYPT_OK if the input key size is acceptable. |
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330 */ |
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331 int rc6_keysize(int *keysize) |
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332 { |
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333 LTC_ARGCHK(keysize != NULL); |
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334 if (*keysize < 8) { |
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335 return CRYPT_INVALID_KEYSIZE; |
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336 } else if (*keysize > 128) { |
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337 *keysize = 128; |
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338 } |
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339 return CRYPT_OK; |
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340 } |
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341 |
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342 #endif /*RC6*/ |
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343 |
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344 |
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345 |
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346 /* $Source: /cvs/libtom/libtomcrypt/src/ciphers/rc6.c,v $ */ |
382
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347 /* $Revision: 1.12 $ */ |
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348 /* $Date: 2006/11/08 23:01:06 $ */ |