Mercurial > dropbear
annotate libtomcrypt/src/ciphers/rc2.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 01 Apr 2022 14:43:27 +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 /**********************************************************************\ |
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10 * To commemorate the 1996 RSA Data Security Conference, the following * |
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11 * code is released into the public domain by its author. Prost! * |
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12 * * |
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13 * This cipher uses 16-bit words and little-endian byte ordering. * |
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14 * I wonder which processor it was optimized for? * |
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15 * * |
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16 * Thanks to CodeView, SoftIce, and D86 for helping bring this code to * |
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17 * the public. * |
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18 \**********************************************************************/ |
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19 #include "tomcrypt.h" |
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20 |
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21 /** |
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22 @file rc2.c |
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23 Implementation of RC2 with fixed effective key length of 64bits |
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24 */ |
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25 |
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26 #ifdef LTC_RC2 |
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27 |
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28 const struct ltc_cipher_descriptor rc2_desc = { |
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29 "rc2", |
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30 12, 8, 128, 8, 16, |
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31 &rc2_setup, |
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32 &rc2_ecb_encrypt, |
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33 &rc2_ecb_decrypt, |
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34 &rc2_test, |
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35 &rc2_done, |
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36 &rc2_keysize, |
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37 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL |
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38 }; |
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39 |
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40 /* 256-entry permutation table, probably derived somehow from pi */ |
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41 static const unsigned char permute[256] = { |
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42 217,120,249,196, 25,221,181,237, 40,233,253,121, 74,160,216,157, |
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43 198,126, 55,131, 43,118, 83,142, 98, 76,100,136, 68,139,251,162, |
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44 23,154, 89,245,135,179, 79, 19, 97, 69,109,141, 9,129,125, 50, |
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45 189,143, 64,235,134,183,123, 11,240,149, 33, 34, 92,107, 78,130, |
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46 84,214,101,147,206, 96,178, 28,115, 86,192, 20,167,140,241,220, |
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47 18,117,202, 31, 59,190,228,209, 66, 61,212, 48,163, 60,182, 38, |
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48 111,191, 14,218, 70,105, 7, 87, 39,242, 29,155,188,148, 67, 3, |
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49 248, 17,199,246,144,239, 62,231, 6,195,213, 47,200,102, 30,215, |
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50 8,232,234,222,128, 82,238,247,132,170,114,172, 53, 77,106, 42, |
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51 150, 26,210,113, 90, 21, 73,116, 75,159,208, 94, 4, 24,164,236, |
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52 194,224, 65,110, 15, 81,203,204, 36,145,175, 80,161,244,112, 57, |
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53 153,124, 58,133, 35,184,180,122,252, 2, 54, 91, 37, 85,151, 49, |
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54 45, 93,250,152,227,138,146,174, 5,223, 41, 16,103,108,186,201, |
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55 211, 0,230,207,225,158,168, 44, 99, 22, 1, 63, 88,226,137,169, |
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56 13, 56, 52, 27,171, 51,255,176,187, 72, 12, 95,185,177,205, 46, |
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57 197,243,219, 71,229,165,156,119, 10,166, 32,104,254,127,193,173 |
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58 }; |
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59 |
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60 /** |
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61 Initialize the RC2 block cipher |
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62 @param key The symmetric key you wish to pass |
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63 @param keylen The key length in bytes |
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64 @param bits The effective key length in bits |
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65 @param num_rounds The number of rounds desired (0 for default) |
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66 @param skey The key in as scheduled by this function. |
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67 @return CRYPT_OK if successful |
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68 */ |
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69 int rc2_setup_ex(const unsigned char *key, int keylen, int bits, int num_rounds, symmetric_key *skey) |
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70 { |
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71 unsigned *xkey = skey->rc2.xkey; |
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72 unsigned char tmp[128]; |
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73 unsigned T8, TM; |
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74 int i; |
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75 |
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76 LTC_ARGCHK(key != NULL); |
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77 LTC_ARGCHK(skey != NULL); |
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78 |
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79 if (keylen == 0 || keylen > 128 || bits > 1024) { |
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80 return CRYPT_INVALID_KEYSIZE; |
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81 } |
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82 if (bits == 0) { |
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83 bits = 1024; |
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84 } |
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85 |
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86 if (num_rounds != 0 && num_rounds != 16) { |
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87 return CRYPT_INVALID_ROUNDS; |
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88 } |
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89 |
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90 for (i = 0; i < keylen; i++) { |
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91 tmp[i] = key[i] & 255; |
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92 } |
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93 |
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94 /* Phase 1: Expand input key to 128 bytes */ |
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95 if (keylen < 128) { |
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96 for (i = keylen; i < 128; i++) { |
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97 tmp[i] = permute[(tmp[i - 1] + tmp[i - keylen]) & 255]; |
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98 } |
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99 } |
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100 |
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101 /* Phase 2 - reduce effective key size to "bits" */ |
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102 T8 = (unsigned)(bits+7)>>3; |
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103 TM = (255 >> (unsigned)(7 & -bits)); |
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104 tmp[128 - T8] = permute[tmp[128 - T8] & TM]; |
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105 for (i = 127 - T8; i >= 0; i--) { |
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106 tmp[i] = permute[tmp[i + 1] ^ tmp[i + T8]]; |
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107 } |
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108 |
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109 /* Phase 3 - copy to xkey in little-endian order */ |
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110 for (i = 0; i < 64; i++) { |
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111 xkey[i] = (unsigned)tmp[2*i] + ((unsigned)tmp[2*i+1] << 8); |
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112 } |
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113 |
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114 #ifdef LTC_CLEAN_STACK |
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115 zeromem(tmp, sizeof(tmp)); |
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116 #endif |
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117 |
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118 return CRYPT_OK; |
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119 } |
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120 |
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121 /** |
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122 Initialize the RC2 block cipher |
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123 |
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124 The effective key length is here always keylen * 8 |
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125 |
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126 @param key The symmetric key you wish to pass |
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127 @param keylen The key length in bytes |
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128 @param num_rounds The number of rounds desired (0 for default) |
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129 @param skey The key in as scheduled by this function. |
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130 @return CRYPT_OK if successful |
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131 */ |
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132 int rc2_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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133 { |
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134 return rc2_setup_ex(key, keylen, keylen * 8, num_rounds, skey); |
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135 } |
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136 |
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137 /**********************************************************************\ |
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138 * Encrypt an 8-byte block of plaintext using the given key. * |
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139 \**********************************************************************/ |
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140 /** |
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141 Encrypts a block of text with RC2 |
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142 @param pt The input plaintext (8 bytes) |
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143 @param ct The output ciphertext (8 bytes) |
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144 @param skey The key as scheduled |
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145 @return CRYPT_OK if successful |
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146 */ |
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147 #ifdef LTC_CLEAN_STACK |
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148 static int _rc2_ecb_encrypt( const unsigned char *pt, |
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149 unsigned char *ct, |
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150 symmetric_key *skey) |
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151 #else |
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152 int rc2_ecb_encrypt( const unsigned char *pt, |
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153 unsigned char *ct, |
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154 symmetric_key *skey) |
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155 #endif |
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156 { |
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157 unsigned *xkey; |
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158 unsigned x76, x54, x32, x10, i; |
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159 |
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160 LTC_ARGCHK(pt != NULL); |
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161 LTC_ARGCHK(ct != NULL); |
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162 LTC_ARGCHK(skey != NULL); |
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163 |
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164 xkey = skey->rc2.xkey; |
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165 |
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166 x76 = ((unsigned)pt[7] << 8) + (unsigned)pt[6]; |
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167 x54 = ((unsigned)pt[5] << 8) + (unsigned)pt[4]; |
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168 x32 = ((unsigned)pt[3] << 8) + (unsigned)pt[2]; |
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169 x10 = ((unsigned)pt[1] << 8) + (unsigned)pt[0]; |
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170 |
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171 for (i = 0; i < 16; i++) { |
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172 x10 = (x10 + (x32 & ~x76) + (x54 & x76) + xkey[4*i+0]) & 0xFFFF; |
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173 x10 = ((x10 << 1) | (x10 >> 15)); |
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174 |
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175 x32 = (x32 + (x54 & ~x10) + (x76 & x10) + xkey[4*i+1]) & 0xFFFF; |
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176 x32 = ((x32 << 2) | (x32 >> 14)); |
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177 |
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178 x54 = (x54 + (x76 & ~x32) + (x10 & x32) + xkey[4*i+2]) & 0xFFFF; |
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179 x54 = ((x54 << 3) | (x54 >> 13)); |
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180 |
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181 x76 = (x76 + (x10 & ~x54) + (x32 & x54) + xkey[4*i+3]) & 0xFFFF; |
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182 x76 = ((x76 << 5) | (x76 >> 11)); |
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183 |
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184 if (i == 4 || i == 10) { |
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185 x10 = (x10 + xkey[x76 & 63]) & 0xFFFF; |
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186 x32 = (x32 + xkey[x10 & 63]) & 0xFFFF; |
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187 x54 = (x54 + xkey[x32 & 63]) & 0xFFFF; |
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188 x76 = (x76 + xkey[x54 & 63]) & 0xFFFF; |
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189 } |
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190 } |
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191 |
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192 ct[0] = (unsigned char)x10; |
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193 ct[1] = (unsigned char)(x10 >> 8); |
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194 ct[2] = (unsigned char)x32; |
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195 ct[3] = (unsigned char)(x32 >> 8); |
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196 ct[4] = (unsigned char)x54; |
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197 ct[5] = (unsigned char)(x54 >> 8); |
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198 ct[6] = (unsigned char)x76; |
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199 ct[7] = (unsigned char)(x76 >> 8); |
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200 |
382
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201 return CRYPT_OK; |
285
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202 } |
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203 |
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204 #ifdef LTC_CLEAN_STACK |
382
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205 int rc2_ecb_encrypt( const unsigned char *pt, |
285
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206 unsigned char *ct, |
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207 symmetric_key *skey) |
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208 { |
382
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209 int err = _rc2_ecb_encrypt(pt, ct, skey); |
285
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210 burn_stack(sizeof(unsigned *) + sizeof(unsigned) * 5); |
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211 return err; |
285
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212 } |
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213 #endif |
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214 |
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215 /**********************************************************************\ |
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216 * Decrypt an 8-byte block of ciphertext using the given key. * |
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217 \**********************************************************************/ |
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218 /** |
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219 Decrypts a block of text with RC2 |
285
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220 @param ct The input ciphertext (8 bytes) |
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221 @param pt The output plaintext (8 bytes) |
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222 @param skey The key as scheduled |
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223 @return CRYPT_OK if successful |
285
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224 */ |
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225 #ifdef LTC_CLEAN_STACK |
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226 static int _rc2_ecb_decrypt( const unsigned char *ct, |
285
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227 unsigned char *pt, |
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228 symmetric_key *skey) |
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229 #else |
382
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230 int rc2_ecb_decrypt( const unsigned char *ct, |
285
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231 unsigned char *pt, |
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232 symmetric_key *skey) |
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233 #endif |
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234 { |
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235 unsigned x76, x54, x32, x10; |
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236 unsigned *xkey; |
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237 int i; |
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238 |
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239 LTC_ARGCHK(pt != NULL); |
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240 LTC_ARGCHK(ct != NULL); |
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241 LTC_ARGCHK(skey != NULL); |
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242 |
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243 xkey = skey->rc2.xkey; |
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244 |
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245 x76 = ((unsigned)ct[7] << 8) + (unsigned)ct[6]; |
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246 x54 = ((unsigned)ct[5] << 8) + (unsigned)ct[4]; |
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247 x32 = ((unsigned)ct[3] << 8) + (unsigned)ct[2]; |
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248 x10 = ((unsigned)ct[1] << 8) + (unsigned)ct[0]; |
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249 |
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250 for (i = 15; i >= 0; i--) { |
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251 if (i == 4 || i == 10) { |
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252 x76 = (x76 - xkey[x54 & 63]) & 0xFFFF; |
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253 x54 = (x54 - xkey[x32 & 63]) & 0xFFFF; |
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254 x32 = (x32 - xkey[x10 & 63]) & 0xFFFF; |
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255 x10 = (x10 - xkey[x76 & 63]) & 0xFFFF; |
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256 } |
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257 |
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258 x76 = ((x76 << 11) | (x76 >> 5)); |
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259 x76 = (x76 - ((x10 & ~x54) + (x32 & x54) + xkey[4*i+3])) & 0xFFFF; |
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260 |
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261 x54 = ((x54 << 13) | (x54 >> 3)); |
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262 x54 = (x54 - ((x76 & ~x32) + (x10 & x32) + xkey[4*i+2])) & 0xFFFF; |
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263 |
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264 x32 = ((x32 << 14) | (x32 >> 2)); |
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265 x32 = (x32 - ((x54 & ~x10) + (x76 & x10) + xkey[4*i+1])) & 0xFFFF; |
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266 |
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267 x10 = ((x10 << 15) | (x10 >> 1)); |
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268 x10 = (x10 - ((x32 & ~x76) + (x54 & x76) + xkey[4*i+0])) & 0xFFFF; |
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269 } |
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270 |
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271 pt[0] = (unsigned char)x10; |
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272 pt[1] = (unsigned char)(x10 >> 8); |
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273 pt[2] = (unsigned char)x32; |
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274 pt[3] = (unsigned char)(x32 >> 8); |
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275 pt[4] = (unsigned char)x54; |
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276 pt[5] = (unsigned char)(x54 >> 8); |
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277 pt[6] = (unsigned char)x76; |
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278 pt[7] = (unsigned char)(x76 >> 8); |
382
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279 |
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280 return CRYPT_OK; |
285
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281 } |
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282 |
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283 #ifdef LTC_CLEAN_STACK |
382
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284 int rc2_ecb_decrypt( const unsigned char *ct, |
285
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285 unsigned char *pt, |
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286 symmetric_key *skey) |
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287 { |
382
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288 int err = _rc2_ecb_decrypt(ct, pt, skey); |
285
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289 burn_stack(sizeof(unsigned *) + sizeof(unsigned) * 4 + sizeof(int)); |
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290 return err; |
285
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291 } |
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292 #endif |
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293 |
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294 /** |
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295 Performs a self-test of the RC2 block cipher |
285
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296 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled |
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297 */ |
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298 int rc2_test(void) |
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299 { |
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300 #ifndef LTC_TEST |
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301 return CRYPT_NOP; |
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302 #else |
285
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303 static const struct { |
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304 int keylen, bits; |
285
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305 unsigned char key[16], pt[8], ct[8]; |
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306 } tests[] = { |
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307 |
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308 { 8, 63, |
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309 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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310 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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311 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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312 { 0xeb, 0xb7, 0x73, 0xf9, 0x93, 0x27, 0x8e, 0xff } |
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313 }, |
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314 { 8, 64, |
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315 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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316 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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317 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, |
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318 { 0x27, 0x8b, 0x27, 0xe4, 0x2e, 0x2f, 0x0d, 0x49 } |
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319 }, |
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320 { 8, 64, |
285
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321 { 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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322 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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323 { 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }, |
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324 { 0x30, 0x64, 0x9e, 0xdf, 0x9b, 0xe7, 0xd2, 0xc2 } |
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325 }, |
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326 { 1, 64, |
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327 { 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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328 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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329 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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330 { 0x61, 0xa8, 0xa2, 0x44, 0xad, 0xac, 0xcc, 0xf0 } |
285
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331 }, |
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332 { 7, 64, |
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333 { 0x88, 0xbc, 0xa9, 0x0e, 0x90, 0x87, 0x5a, 0x00, |
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334 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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335 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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336 { 0x6c, 0xcf, 0x43, 0x08, 0x97, 0x4c, 0x26, 0x7f } |
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337 }, |
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338 { 16, 64, |
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339 { 0x88, 0xbc, 0xa9, 0x0e, 0x90, 0x87, 0x5a, 0x7f, |
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340 0x0f, 0x79, 0xc3, 0x84, 0x62, 0x7b, 0xaf, 0xb2 }, |
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341 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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342 { 0x1a, 0x80, 0x7d, 0x27, 0x2b, 0xbe, 0x5d, 0xb1 } |
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343 }, |
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344 { 16, 128, |
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345 { 0x88, 0xbc, 0xa9, 0x0e, 0x90, 0x87, 0x5a, 0x7f, |
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346 0x0f, 0x79, 0xc3, 0x84, 0x62, 0x7b, 0xaf, 0xb2 }, |
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347 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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348 { 0x22, 0x69, 0x55, 0x2a, 0xb0, 0xf8, 0x5c, 0xa6 } |
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349 } |
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350 }; |
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351 int x, y, err; |
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352 symmetric_key skey; |
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353 unsigned char tmp[2][8]; |
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354 |
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355 for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) { |
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356 zeromem(tmp, sizeof(tmp)); |
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357 if (tests[x].bits == (tests[x].keylen * 8)) { |
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358 if ((err = rc2_setup(tests[x].key, tests[x].keylen, 0, &skey)) != CRYPT_OK) { |
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359 return err; |
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360 } |
285
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361 } |
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362 else { |
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363 if ((err = rc2_setup_ex(tests[x].key, tests[x].keylen, tests[x].bits, 0, &skey)) != CRYPT_OK) { |
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364 return err; |
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365 } |
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366 } |
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367 |
285
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368 rc2_ecb_encrypt(tests[x].pt, tmp[0], &skey); |
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369 rc2_ecb_decrypt(tmp[0], tmp[1], &skey); |
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370 |
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371 if (compare_testvector(tmp[0], 8, tests[x].ct, 8, "RC2 CT", x) || |
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372 compare_testvector(tmp[1], 8, tests[x].pt, 8, "RC2 PT", x)) { |
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373 return CRYPT_FAIL_TESTVECTOR; |
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374 } |
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375 |
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376 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */ |
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377 for (y = 0; y < 8; y++) tmp[0][y] = 0; |
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378 for (y = 0; y < 1000; y++) rc2_ecb_encrypt(tmp[0], tmp[0], &skey); |
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379 for (y = 0; y < 1000; y++) rc2_ecb_decrypt(tmp[0], tmp[0], &skey); |
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380 for (y = 0; y < 8; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; |
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381 } |
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382 return CRYPT_OK; |
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383 #endif |
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384 } |
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385 |
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386 /** Terminate the context |
285
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387 @param skey The scheduled key |
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388 */ |
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389 void rc2_done(symmetric_key *skey) |
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390 { |
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391 LTC_UNUSED_PARAM(skey); |
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392 } |
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393 |
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394 /** |
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395 Gets suitable key size |
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396 @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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397 @return CRYPT_OK if the input key size is acceptable. |
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398 */ |
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399 int rc2_keysize(int *keysize) |
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400 { |
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401 LTC_ARGCHK(keysize != NULL); |
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402 if (*keysize < 1) { |
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403 return CRYPT_INVALID_KEYSIZE; |
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404 } else if (*keysize > 128) { |
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405 *keysize = 128; |
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406 } |
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407 return CRYPT_OK; |
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408 } |
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409 |
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410 #endif |
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411 |
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412 |
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413 |
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414 |
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415 /* ref: $Format:%D$ */ |
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416 /* git commit: $Format:%H$ */ |
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417 /* commit time: $Format:%ai$ */ |