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annotate xtea.c @ 138:b1edc9158f6c libtomcrypt

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Pristine compilation works
author Matt Johnston <matt@ucc.asn.au>
date Fri, 17 Dec 2004 06:27:09 +0000
parents d7da3b1e1540
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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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 #include "mycrypt.h"
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13
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14 #ifdef XTEA
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15
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16 const struct _cipher_descriptor xtea_desc =
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17 {
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18 "xtea",
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19 1,
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20 16, 16, 8, 32,
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21 &xtea_setup,
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22 &xtea_ecb_encrypt,
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23 &xtea_ecb_decrypt,
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24 &xtea_test,
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25 &xtea_keysize
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26 };
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27
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28 int xtea_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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29 {
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30 unsigned long x, sum, K[4];
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31
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32 _ARGCHK(key != NULL);
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33 _ARGCHK(skey != NULL);
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34
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35 /* check arguments */
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36 if (keylen != 16) {
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37 return CRYPT_INVALID_KEYSIZE;
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38 }
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39
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40 if (num_rounds != 0 && num_rounds != 32) {
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41 return CRYPT_INVALID_ROUNDS;
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42 }
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43
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44 /* load key */
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45 LOAD32L(K[0], key+0);
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46 LOAD32L(K[1], key+4);
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47 LOAD32L(K[2], key+8);
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48 LOAD32L(K[3], key+12);
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49
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50 for (x = sum = 0; x < 32; x++) {
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51 skey->xtea.A[x] = (sum + K[sum&3]) & 0xFFFFFFFFUL;
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52 sum = (sum + 0x9E3779B9UL) & 0xFFFFFFFFUL;
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53 skey->xtea.B[x] = (sum + K[(sum>>11)&3]) & 0xFFFFFFFFUL;
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54 }
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55
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56 #ifdef CLEAN_STACK
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57 zeromem(&K, sizeof(K));
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58 #endif
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59
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60 return CRYPT_OK;
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61 }
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62
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63 void xtea_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key)
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64 {
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65 unsigned long y, z;
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66 int r;
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67
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68 _ARGCHK(pt != NULL);
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69 _ARGCHK(ct != NULL);
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70 _ARGCHK(key != NULL);
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71
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72 LOAD32L(y, &pt[0]);
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73 LOAD32L(z, &pt[4]);
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74 for (r = 0; r < 32; r += 4) {
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75 y = (y + ((((z<<4)^(z>>5)) + z) ^ key->xtea.A[r])) & 0xFFFFFFFFUL;
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76 z = (z + ((((y<<4)^(y>>5)) + y) ^ key->xtea.B[r])) & 0xFFFFFFFFUL;
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77
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78 y = (y + ((((z<<4)^(z>>5)) + z) ^ key->xtea.A[r+1])) & 0xFFFFFFFFUL;
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79 z = (z + ((((y<<4)^(y>>5)) + y) ^ key->xtea.B[r+1])) & 0xFFFFFFFFUL;
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80
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81 y = (y + ((((z<<4)^(z>>5)) + z) ^ key->xtea.A[r+2])) & 0xFFFFFFFFUL;
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82 z = (z + ((((y<<4)^(y>>5)) + y) ^ key->xtea.B[r+2])) & 0xFFFFFFFFUL;
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83
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84 y = (y + ((((z<<4)^(z>>5)) + z) ^ key->xtea.A[r+3])) & 0xFFFFFFFFUL;
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85 z = (z + ((((y<<4)^(y>>5)) + y) ^ key->xtea.B[r+3])) & 0xFFFFFFFFUL;
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86 }
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87 STORE32L(y, &ct[0]);
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88 STORE32L(z, &ct[4]);
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89 }
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90
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91 void xtea_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key)
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92 {
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93 unsigned long y, z;
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94 int r;
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95
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96 _ARGCHK(pt != NULL);
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97 _ARGCHK(ct != NULL);
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98 _ARGCHK(key != NULL);
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99
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100 LOAD32L(y, &ct[0]);
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101 LOAD32L(z, &ct[4]);
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102 for (r = 31; r >= 0; r -= 4) {
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103 z = (z - ((((y<<4)^(y>>5)) + y) ^ key->xtea.B[r])) & 0xFFFFFFFFUL;
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104 y = (y - ((((z<<4)^(z>>5)) + z) ^ key->xtea.A[r])) & 0xFFFFFFFFUL;
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105
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106 z = (z - ((((y<<4)^(y>>5)) + y) ^ key->xtea.B[r-1])) & 0xFFFFFFFFUL;
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107 y = (y - ((((z<<4)^(z>>5)) + z) ^ key->xtea.A[r-1])) & 0xFFFFFFFFUL;
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108
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109 z = (z - ((((y<<4)^(y>>5)) + y) ^ key->xtea.B[r-2])) & 0xFFFFFFFFUL;
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110 y = (y - ((((z<<4)^(z>>5)) + z) ^ key->xtea.A[r-2])) & 0xFFFFFFFFUL;
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111
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112 z = (z - ((((y<<4)^(y>>5)) + y) ^ key->xtea.B[r-3])) & 0xFFFFFFFFUL;
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113 y = (y - ((((z<<4)^(z>>5)) + z) ^ key->xtea.A[r-3])) & 0xFFFFFFFFUL;
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114 }
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115 STORE32L(y, &pt[0]);
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116 STORE32L(z, &pt[4]);
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117 }
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118
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119 int xtea_test(void)
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120 {
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121 #ifndef LTC_TEST
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122 return CRYPT_NOP;
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123 #else
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124 static const unsigned char key[16] =
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125 { 0x78, 0x56, 0x34, 0x12, 0xf0, 0xcd, 0xcb, 0x9a,
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126 0x48, 0x37, 0x26, 0x15, 0xc0, 0xbf, 0xae, 0x9d };
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127 static const unsigned char pt[8] =
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128 { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
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129 static const unsigned char ct[8] =
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130 { 0x75, 0xd7, 0xc5, 0xbf, 0xcf, 0x58, 0xc9, 0x3f };
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131 unsigned char tmp[2][8];
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132 symmetric_key skey;
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133 int err, y;
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134
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135 if ((err = xtea_setup(key, 16, 0, &skey)) != CRYPT_OK) {
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136 return err;
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137 }
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138 xtea_ecb_encrypt(pt, tmp[0], &skey);
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139 xtea_ecb_decrypt(tmp[0], tmp[1], &skey);
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140
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141 if (memcmp(tmp[0], ct, 8) != 0 || memcmp(tmp[1], pt, 8) != 0) {
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142 return CRYPT_FAIL_TESTVECTOR;
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143 }
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144
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145 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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146 for (y = 0; y < 8; y++) tmp[0][y] = 0;
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147 for (y = 0; y < 1000; y++) xtea_ecb_encrypt(tmp[0], tmp[0], &skey);
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148 for (y = 0; y < 1000; y++) xtea_ecb_decrypt(tmp[0], tmp[0], &skey);
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149 for (y = 0; y < 8; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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150
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151 return CRYPT_OK;
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152 #endif
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153 }
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154
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155 int xtea_keysize(int *desired_keysize)
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156 {
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157 _ARGCHK(desired_keysize != NULL);
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158 if (*desired_keysize < 16) {
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159 return CRYPT_INVALID_KEYSIZE;
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160 }
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161 *desired_keysize = 16;
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162 return CRYPT_OK;
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163 }
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164
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165
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166 #endif
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167
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168
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169