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annotate safer.c @ 0:d7da3b1e1540 libtomcrypt

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put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
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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.org
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10 */
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11
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12 /*******************************************************************************
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13 *
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14 * FILE: safer.c
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15 *
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16 * DESCRIPTION: block-cipher algorithm SAFER (Secure And Fast Encryption
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17 * Routine) in its four versions: SAFER K-64, SAFER K-128,
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18 * SAFER SK-64 and SAFER SK-128.
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19 *
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20 * AUTHOR: Richard De Moliner ([email protected])
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21 * Signal and Information Processing Laboratory
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22 * Swiss Federal Institute of Technology
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23 * CH-8092 Zuerich, Switzerland
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24 *
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25 * DATE: September 9, 1995
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26 *
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27 * CHANGE HISTORY:
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28 *
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29 *******************************************************************************/
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30
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31 #include <mycrypt.h>
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32
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33 #ifdef SAFER
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34
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35 const struct _cipher_descriptor
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36 safer_k64_desc = {
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37 "safer-k64",
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38 8, 8, 8, 8, SAFER_K64_DEFAULT_NOF_ROUNDS,
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39 &safer_k64_setup,
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40 &safer_ecb_encrypt,
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41 &safer_ecb_decrypt,
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42 &safer_k64_test,
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43 &safer_64_keysize
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44 },
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45
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46 safer_sk64_desc = {
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47 "safer-sk64",
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48 9, 8, 8, 8, SAFER_SK64_DEFAULT_NOF_ROUNDS,
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49 &safer_sk64_setup,
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50 &safer_ecb_encrypt,
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51 &safer_ecb_decrypt,
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52 &safer_sk64_test,
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53 &safer_64_keysize
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54 },
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55
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56 safer_k128_desc = {
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57 "safer-k128",
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58 10, 16, 16, 8, SAFER_K128_DEFAULT_NOF_ROUNDS,
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59 &safer_k128_setup,
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60 &safer_ecb_encrypt,
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61 &safer_ecb_decrypt,
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62 &safer_sk128_test,
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63 &safer_128_keysize
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64 },
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65
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66 safer_sk128_desc = {
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67 "safer-sk128",
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68 11, 16, 16, 8, SAFER_SK128_DEFAULT_NOF_ROUNDS,
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69 &safer_sk128_setup,
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70 &safer_ecb_encrypt,
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71 &safer_ecb_decrypt,
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72 &safer_sk128_test,
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73 &safer_128_keysize
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74 };
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75
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76 /******************* Constants ************************************************/
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77 // #define TAB_LEN 256
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78
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79 /******************* Assertions ***********************************************/
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80
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81 /******************* Macros ***************************************************/
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82 #define ROL8(x, n) ((unsigned char)((unsigned int)(x) << (n)\
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83 |(unsigned int)((x) & 0xFF) >> (8 - (n))))
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84 #define EXP(x) safer_ebox[(x) & 0xFF]
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85 #define LOG(x) safer_lbox[(x) & 0xFF]
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86 #define PHT(x, y) { y += x; x += y; }
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87 #define IPHT(x, y) { x -= y; y -= x; }
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88
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89 /******************* Types ****************************************************/
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90 extern const unsigned char safer_ebox[], safer_lbox[];
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91
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92 #ifdef CLEAN_STACK
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93 static void _Safer_Expand_Userkey(const unsigned char *userkey_1,
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94 const unsigned char *userkey_2,
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95 unsigned int nof_rounds,
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96 int strengthened,
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97 safer_key_t key)
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98 #else
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99 static void Safer_Expand_Userkey(const unsigned char *userkey_1,
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100 const unsigned char *userkey_2,
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101 unsigned int nof_rounds,
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102 int strengthened,
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103 safer_key_t key)
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104 #endif
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105 { unsigned int i, j, k;
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106 unsigned char ka[SAFER_BLOCK_LEN + 1];
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107 unsigned char kb[SAFER_BLOCK_LEN + 1];
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108
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109 if (SAFER_MAX_NOF_ROUNDS < nof_rounds)
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110 nof_rounds = SAFER_MAX_NOF_ROUNDS;
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111 *key++ = (unsigned char)nof_rounds;
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112 ka[SAFER_BLOCK_LEN] = (unsigned char)0;
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113 kb[SAFER_BLOCK_LEN] = (unsigned char)0;
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114 k = 0;
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115 for (j = 0; j < SAFER_BLOCK_LEN; j++) {
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116 ka[j] = ROL8(userkey_1[j], 5);
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117 ka[SAFER_BLOCK_LEN] ^= ka[j];
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118 kb[j] = *key++ = userkey_2[j];
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119 kb[SAFER_BLOCK_LEN] ^= kb[j];
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120 }
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121 for (i = 1; i <= nof_rounds; i++) {
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122 for (j = 0; j < SAFER_BLOCK_LEN + 1; j++) {
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123 ka[j] = ROL8(ka[j], 6);
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124 kb[j] = ROL8(kb[j], 6);
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125 }
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126 if (strengthened) {
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127 k = 2 * i - 1;
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128 while (k >= (SAFER_BLOCK_LEN + 1)) { k -= SAFER_BLOCK_LEN + 1; }
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129 }
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130 for (j = 0; j < SAFER_BLOCK_LEN; j++) {
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131 if (strengthened) {
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132 *key++ = (ka[k]
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133 + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 1)&0xFF)]]) & 0xFF;
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134 if (++k == (SAFER_BLOCK_LEN + 1)) { k = 0; }
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135 } else {
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136 *key++ = (ka[j] + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 1)&0xFF)]]) & 0xFF;
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137 }
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diff changeset
138 }
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diff changeset
139 if (strengthened) {
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diff changeset
140 k = 2 * i;
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parents:
diff changeset
141 while (k >= (SAFER_BLOCK_LEN + 1)) { k -= SAFER_BLOCK_LEN + 1; }
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142 }
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diff changeset
143 for (j = 0; j < SAFER_BLOCK_LEN; j++) {
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diff changeset
144 if (strengthened) {
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diff changeset
145 *key++ = (kb[k]
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146 + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 10)&0xFF)]]) & 0xFF;
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diff changeset
147 if (++k == (SAFER_BLOCK_LEN + 1)) { k = 0; }
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diff changeset
148 } else {
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diff changeset
149 *key++ = (kb[j] + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 10)&0xFF)]]) & 0xFF;
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150 }
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diff changeset
151 }
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diff changeset
152 }
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diff changeset
153
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diff changeset
154 #ifdef CLEAN_STACK
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155 zeromem(ka, sizeof(ka));
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156 zeromem(kb, sizeof(kb));
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157 #endif
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158 }
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159
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160 #ifdef CLEAN_STACK
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161 static void Safer_Expand_Userkey(const unsigned char *userkey_1,
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diff changeset
162 const unsigned char *userkey_2,
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diff changeset
163 unsigned int nof_rounds,
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164 int strengthened,
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165 safer_key_t key)
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166 {
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167 _Safer_Expand_Userkey(userkey_1, userkey_2, nof_rounds, strengthened, key);
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168 burn_stack(sizeof(unsigned char) * (2 * (SAFER_BLOCK_LEN + 1)) + sizeof(unsigned int)*2);
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169 }
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170 #endif
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171
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diff changeset
172 int safer_k64_setup(const unsigned char *key, int keylen, int numrounds, symmetric_key *skey)
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173 {
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174 _ARGCHK(key != NULL);
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175 _ARGCHK(skey != NULL);
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176
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177 if (numrounds != 0 && (numrounds < 6 || numrounds > SAFER_MAX_NOF_ROUNDS)) {
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178 return CRYPT_INVALID_ROUNDS;
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179 }
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180
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181 if (keylen != 8) {
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182 return CRYPT_INVALID_KEYSIZE;
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183 }
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184
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diff changeset
185 Safer_Expand_Userkey(key, key, (unsigned int)(numrounds != 0 ?numrounds:SAFER_K64_DEFAULT_NOF_ROUNDS), 0, skey->safer.key);
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diff changeset
186 return CRYPT_OK;
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187 }
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188
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diff changeset
189 int safer_sk64_setup(const unsigned char *key, int keylen, int numrounds, symmetric_key *skey)
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190 {
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191 _ARGCHK(key != NULL);
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192 _ARGCHK(skey != NULL);
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193
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194 if (numrounds != 0 && (numrounds < 6 || numrounds > SAFER_MAX_NOF_ROUNDS)) {
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195 return CRYPT_INVALID_ROUNDS;
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196 }
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197
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198 if (keylen != 8) {
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199 return CRYPT_INVALID_KEYSIZE;
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200 }
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diff changeset
201
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202 Safer_Expand_Userkey(key, key, (unsigned int)(numrounds != 0 ?numrounds:SAFER_SK64_DEFAULT_NOF_ROUNDS), 1, skey->safer.key);
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diff changeset
203 return CRYPT_OK;
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204 }
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205
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206 int safer_k128_setup(const unsigned char *key, int keylen, int numrounds, symmetric_key *skey)
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diff changeset
207 {
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208 _ARGCHK(key != NULL);
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diff changeset
209 _ARGCHK(skey != NULL);
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diff changeset
210
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diff changeset
211 if (numrounds != 0 && (numrounds < 6 || numrounds > SAFER_MAX_NOF_ROUNDS)) {
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diff changeset
212 return CRYPT_INVALID_ROUNDS;
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213 }
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214
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diff changeset
215 if (keylen != 16) {
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diff changeset
216 return CRYPT_INVALID_KEYSIZE;
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diff changeset
217 }
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diff changeset
218
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diff changeset
219 Safer_Expand_Userkey(key, key+8, (unsigned int)(numrounds != 0 ?numrounds:SAFER_K128_DEFAULT_NOF_ROUNDS), 0, skey->safer.key);
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diff changeset
220 return CRYPT_OK;
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diff changeset
221 }
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diff changeset
222
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diff changeset
223 int safer_sk128_setup(const unsigned char *key, int keylen, int numrounds, symmetric_key *skey)
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diff changeset
224 {
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diff changeset
225 _ARGCHK(key != NULL);
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diff changeset
226 _ARGCHK(skey != NULL);
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diff changeset
227
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diff changeset
228 if (numrounds != 0 && (numrounds < 6 || numrounds > SAFER_MAX_NOF_ROUNDS)) {
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diff changeset
229 return CRYPT_INVALID_ROUNDS;
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diff changeset
230 }
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diff changeset
231
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diff changeset
232 if (keylen != 16) {
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diff changeset
233 return CRYPT_INVALID_KEYSIZE;
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diff changeset
234 }
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diff changeset
235
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diff changeset
236 Safer_Expand_Userkey(key, key+8, (unsigned int)(numrounds != 0?numrounds:SAFER_SK128_DEFAULT_NOF_ROUNDS), 1, skey->safer.key);
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parents:
diff changeset
237 return CRYPT_OK;
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diff changeset
238 }
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diff changeset
239
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diff changeset
240 #ifdef CLEAN_STACK
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diff changeset
241 static void _safer_ecb_encrypt(const unsigned char *block_in,
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diff changeset
242 unsigned char *block_out,
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diff changeset
243 symmetric_key *skey)
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diff changeset
244 #else
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diff changeset
245 void safer_ecb_encrypt(const unsigned char *block_in,
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parents:
diff changeset
246 unsigned char *block_out,
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diff changeset
247 symmetric_key *skey)
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diff changeset
248 #endif
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diff changeset
249 { unsigned char a, b, c, d, e, f, g, h, t;
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parents:
diff changeset
250 unsigned int round;
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diff changeset
251 unsigned char *key;
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diff changeset
252
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diff changeset
253 _ARGCHK(block_in != NULL);
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diff changeset
254 _ARGCHK(block_out != NULL);
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parents:
diff changeset
255 _ARGCHK(skey != NULL);
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parents:
diff changeset
256
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diff changeset
257 key = skey->safer.key;
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diff changeset
258 a = block_in[0]; b = block_in[1]; c = block_in[2]; d = block_in[3];
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diff changeset
259 e = block_in[4]; f = block_in[5]; g = block_in[6]; h = block_in[7];
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parents:
diff changeset
260 if (SAFER_MAX_NOF_ROUNDS < (round = *key)) round = SAFER_MAX_NOF_ROUNDS;
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parents:
diff changeset
261 while(round-- > 0)
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parents:
diff changeset
262 {
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parents:
diff changeset
263 a ^= *++key; b += *++key; c += *++key; d ^= *++key;
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parents:
diff changeset
264 e ^= *++key; f += *++key; g += *++key; h ^= *++key;
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parents:
diff changeset
265 a = EXP(a) + *++key; b = LOG(b) ^ *++key;
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parents:
diff changeset
266 c = LOG(c) ^ *++key; d = EXP(d) + *++key;
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diff changeset
267 e = EXP(e) + *++key; f = LOG(f) ^ *++key;
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diff changeset
268 g = LOG(g) ^ *++key; h = EXP(h) + *++key;
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diff changeset
269 PHT(a, b); PHT(c, d); PHT(e, f); PHT(g, h);
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diff changeset
270 PHT(a, c); PHT(e, g); PHT(b, d); PHT(f, h);
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diff changeset
271 PHT(a, e); PHT(b, f); PHT(c, g); PHT(d, h);
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diff changeset
272 t = b; b = e; e = c; c = t; t = d; d = f; f = g; g = t;
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diff changeset
273 }
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diff changeset
274 a ^= *++key; b += *++key; c += *++key; d ^= *++key;
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diff changeset
275 e ^= *++key; f += *++key; g += *++key; h ^= *++key;
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diff changeset
276 block_out[0] = a & 0xFF; block_out[1] = b & 0xFF;
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diff changeset
277 block_out[2] = c & 0xFF; block_out[3] = d & 0xFF;
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diff changeset
278 block_out[4] = e & 0xFF; block_out[5] = f & 0xFF;
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diff changeset
279 block_out[6] = g & 0xFF; block_out[7] = h & 0xFF;
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diff changeset
280 }
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diff changeset
281
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diff changeset
282 #ifdef CLEAN_STACK
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diff changeset
283 void safer_ecb_encrypt(const unsigned char *block_in,
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diff changeset
284 unsigned char *block_out,
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diff changeset
285 symmetric_key *skey)
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diff changeset
286 {
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diff changeset
287 _safer_ecb_encrypt(block_in, block_out, skey);
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diff changeset
288 burn_stack(sizeof(unsigned char) * 9 + sizeof(unsigned int) + sizeof(unsigned char *));
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289 }
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diff changeset
290 #endif
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diff changeset
291
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diff changeset
292 #ifdef CLEAN_STACK
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diff changeset
293 static void _safer_ecb_decrypt(const unsigned char *block_in,
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diff changeset
294 unsigned char *block_out,
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diff changeset
295 symmetric_key *skey)
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diff changeset
296 #else
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diff changeset
297 void safer_ecb_decrypt(const unsigned char *block_in,
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diff changeset
298 unsigned char *block_out,
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diff changeset
299 symmetric_key *skey)
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diff changeset
300 #endif
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diff changeset
301 { unsigned char a, b, c, d, e, f, g, h, t;
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diff changeset
302 unsigned int round;
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diff changeset
303 unsigned char *key;
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diff changeset
304
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diff changeset
305 _ARGCHK(block_in != NULL);
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diff changeset
306 _ARGCHK(block_out != NULL);
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diff changeset
307 _ARGCHK(skey != NULL);
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diff changeset
308
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diff changeset
309 key = skey->safer.key;
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diff changeset
310 a = block_in[0]; b = block_in[1]; c = block_in[2]; d = block_in[3];
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diff changeset
311 e = block_in[4]; f = block_in[5]; g = block_in[6]; h = block_in[7];
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diff changeset
312 if (SAFER_MAX_NOF_ROUNDS < (round = *key)) round = SAFER_MAX_NOF_ROUNDS;
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diff changeset
313 key += SAFER_BLOCK_LEN * (1 + 2 * round);
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diff changeset
314 h ^= *key; g -= *--key; f -= *--key; e ^= *--key;
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diff changeset
315 d ^= *--key; c -= *--key; b -= *--key; a ^= *--key;
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parents:
diff changeset
316 while (round--)
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diff changeset
317 {
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diff changeset
318 t = e; e = b; b = c; c = t; t = f; f = d; d = g; g = t;
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diff changeset
319 IPHT(a, e); IPHT(b, f); IPHT(c, g); IPHT(d, h);
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diff changeset
320 IPHT(a, c); IPHT(e, g); IPHT(b, d); IPHT(f, h);
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diff changeset
321 IPHT(a, b); IPHT(c, d); IPHT(e, f); IPHT(g, h);
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diff changeset
322 h -= *--key; g ^= *--key; f ^= *--key; e -= *--key;
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diff changeset
323 d -= *--key; c ^= *--key; b ^= *--key; a -= *--key;
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diff changeset
324 h = LOG(h) ^ *--key; g = EXP(g) - *--key;
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diff changeset
325 f = EXP(f) - *--key; e = LOG(e) ^ *--key;
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diff changeset
326 d = LOG(d) ^ *--key; c = EXP(c) - *--key;
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diff changeset
327 b = EXP(b) - *--key; a = LOG(a) ^ *--key;
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diff changeset
328 }
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diff changeset
329 block_out[0] = a & 0xFF; block_out[1] = b & 0xFF;
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diff changeset
330 block_out[2] = c & 0xFF; block_out[3] = d & 0xFF;
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diff changeset
331 block_out[4] = e & 0xFF; block_out[5] = f & 0xFF;
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diff changeset
332 block_out[6] = g & 0xFF; block_out[7] = h & 0xFF;
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diff changeset
333 }
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diff changeset
334
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diff changeset
335 #ifdef CLEAN_STACK
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diff changeset
336 void safer_ecb_decrypt(const unsigned char *block_in,
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diff changeset
337 unsigned char *block_out,
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diff changeset
338 symmetric_key *skey)
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diff changeset
339 {
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diff changeset
340 _safer_ecb_decrypt(block_in, block_out, skey);
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diff changeset
341 burn_stack(sizeof(unsigned char) * 9 + sizeof(unsigned int) + sizeof(unsigned char *));
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diff changeset
342 }
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diff changeset
343 #endif
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diff changeset
344
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diff changeset
345 int safer_64_keysize(int *keysize)
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diff changeset
346 {
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diff changeset
347 _ARGCHK(keysize != NULL);
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diff changeset
348 if (*keysize < 8) {
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diff changeset
349 return CRYPT_INVALID_KEYSIZE;
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diff changeset
350 } else {
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diff changeset
351 *keysize = 8;
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diff changeset
352 return CRYPT_OK;
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diff changeset
353 }
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diff changeset
354 }
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diff changeset
355
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diff changeset
356 int safer_128_keysize(int *keysize)
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diff changeset
357 {
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diff changeset
358 _ARGCHK(keysize != NULL);
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diff changeset
359 if (*keysize < 16) {
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diff changeset
360 return CRYPT_INVALID_KEYSIZE;
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diff changeset
361 } else {
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diff changeset
362 *keysize = 16;
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diff changeset
363 return CRYPT_OK;
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parents:
diff changeset
364 }
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parents:
diff changeset
365 }
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diff changeset
366
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diff changeset
367 int safer_k64_test(void)
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diff changeset
368 {
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diff changeset
369 #ifndef LTC_TEST
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diff changeset
370 return CRYPT_NOP;
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diff changeset
371 #else
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diff changeset
372 static const unsigned char k64_pt[] = { 1, 2, 3, 4, 5, 6, 7, 8 },
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diff changeset
373 k64_key[] = { 8, 7, 6, 5, 4, 3, 2, 1 },
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diff changeset
374 k64_ct[] = { 200, 242, 156, 221, 135, 120, 62, 217 };
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diff changeset
375
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diff changeset
376 symmetric_key skey;
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diff changeset
377 unsigned char buf[2][8];
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diff changeset
378 int err;
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diff changeset
379
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diff changeset
380 /* test K64 */
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diff changeset
381 if ((err = safer_k64_setup(k64_key, 8, 6, &skey)) != CRYPT_OK) {
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diff changeset
382 return err;
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diff changeset
383 }
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diff changeset
384 safer_ecb_encrypt(k64_pt, buf[0], &skey);
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diff changeset
385 safer_ecb_decrypt(buf[0], buf[1], &skey);
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parents:
diff changeset
386
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parents:
diff changeset
387 if (memcmp(buf[0], k64_ct, 8) != 0 || memcmp(buf[1], k64_pt, 8) != 0) {
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diff changeset
388 return CRYPT_FAIL_TESTVECTOR;
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parents:
diff changeset
389 }
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parents:
diff changeset
390
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parents:
diff changeset
391 return CRYPT_OK;
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parents:
diff changeset
392 #endif
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parents:
diff changeset
393 }
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parents:
diff changeset
394
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395
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396 int safer_sk64_test(void)
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397 {
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398 #ifndef LTC_TEST
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399 return CRYPT_NOP;
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400 #else
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401 static const unsigned char sk64_pt[] = { 1, 2, 3, 4, 5, 6, 7, 8 },
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402 sk64_key[] = { 1, 2, 3, 4, 5, 6, 7, 8 },
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403 sk64_ct[] = { 95, 206, 155, 162, 5, 132, 56, 199 };
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404
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405 symmetric_key skey;
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406 unsigned char buf[2][8];
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407 int err, y;
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408
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409 /* test SK64 */
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410 if ((err = safer_sk64_setup(sk64_key, 8, 6, &skey)) != CRYPT_OK) {
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411 return err;
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412 }
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413
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414 safer_ecb_encrypt(sk64_pt, buf[0], &skey);
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415 safer_ecb_decrypt(buf[0], buf[1], &skey);
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416
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417 if (memcmp(buf[0], sk64_ct, 8) != 0 || memcmp(buf[1], sk64_pt, 8) != 0) {
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418 return CRYPT_FAIL_TESTVECTOR;
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419 }
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420
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421 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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422 for (y = 0; y < 8; y++) buf[0][y] = 0;
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423 for (y = 0; y < 1000; y++) safer_ecb_encrypt(buf[0], buf[0], &skey);
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424 for (y = 0; y < 1000; y++) safer_ecb_decrypt(buf[0], buf[0], &skey);
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425 for (y = 0; y < 8; y++) if (buf[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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426
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427 return CRYPT_OK;
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428 #endif
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429 }
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430
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431 int safer_sk128_test(void)
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432 {
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433 #ifndef LTC_TEST
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434 return CRYPT_NOP;
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435 #else
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436 static const unsigned char sk128_pt[] = { 1, 2, 3, 4, 5, 6, 7, 8 },
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437 sk128_key[] = { 1, 2, 3, 4, 5, 6, 7, 8,
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438 0, 0, 0, 0, 0, 0, 0, 0 },
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439 sk128_ct[] = { 255, 120, 17, 228, 179, 167, 46, 113 };
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440
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441 symmetric_key skey;
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442 unsigned char buf[2][8];
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443 int err, y;
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444
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445 /* test SK128 */
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446 if ((err = safer_sk128_setup(sk128_key, 16, 0, &skey)) != CRYPT_OK) {
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447 return err;
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448 }
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449 safer_ecb_encrypt(sk128_pt, buf[0], &skey);
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450 safer_ecb_decrypt(buf[0], buf[1], &skey);
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451
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452 if (memcmp(buf[0], sk128_ct, 8) != 0 || memcmp(buf[1], sk128_pt, 8) != 0) {
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453 return CRYPT_FAIL_TESTVECTOR;
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454 }
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455
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456 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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457 for (y = 0; y < 8; y++) buf[0][y] = 0;
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458 for (y = 0; y < 1000; y++) safer_ecb_encrypt(buf[0], buf[0], &skey);
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459 for (y = 0; y < 1000; y++) safer_ecb_decrypt(buf[0], buf[0], &skey);
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460 for (y = 0; y < 8; y++) if (buf[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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461 return CRYPT_OK;
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462 #endif
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463 }
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464
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465 #endif
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466
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467
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468