Mercurial > dropbear

annotate src/ciphers/xtea.c @ 192:9cc34777b479 libtomcrypt

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propagate from branch 'au.asn.ucc.matt.ltc-orig' (head 9ba8f01f44320e9cb9f19881105ae84f84a43ea9) to branch 'au.asn.ucc.matt.dropbear.ltc' (head dbf51c569bc34956ad948e4cc87a0eeb2170b768)
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 May 2005 06:36:47 +0000
parents 1c15b283127b
children 39d5d58461d6
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191
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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 @file xtea.c
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14 Implementation of XTEA, Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef XTEA
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19
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20 const struct ltc_cipher_descriptor xtea_desc =
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21 {
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22 "xtea",
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23 1,
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24 16, 16, 8, 32,
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25 &xtea_setup,
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26 &xtea_ecb_encrypt,
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27 &xtea_ecb_decrypt,
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28 &xtea_test,
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29 &xtea_done,
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30 &xtea_keysize,
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31 NULL, NULL, NULL, NULL, NULL, NULL, NULL
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32 };
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33
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34 int xtea_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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35 {
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36 unsigned long x, sum, K[4];
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37
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38 LTC_ARGCHK(key != NULL);
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39 LTC_ARGCHK(skey != NULL);
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40
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41 /* check arguments */
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42 if (keylen != 16) {
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43 return CRYPT_INVALID_KEYSIZE;
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44 }
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45
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46 if (num_rounds != 0 && num_rounds != 32) {
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47 return CRYPT_INVALID_ROUNDS;
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48 }
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49
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50 /* load key */
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51 LOAD32L(K[0], key+0);
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52 LOAD32L(K[1], key+4);
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53 LOAD32L(K[2], key+8);
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54 LOAD32L(K[3], key+12);
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55
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56 for (x = sum = 0; x < 32; x++) {
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57 skey->xtea.A[x] = (sum + K[sum&3]) & 0xFFFFFFFFUL;
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58 sum = (sum + 0x9E3779B9UL) & 0xFFFFFFFFUL;
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59 skey->xtea.B[x] = (sum + K[(sum>>11)&3]) & 0xFFFFFFFFUL;
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60 }
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61
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62 #ifdef LTC_CLEAN_STACK
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63 zeromem(&K, sizeof(K));
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64 #endif
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65
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66 return CRYPT_OK;
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67 }
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68
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69 /**
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70 Encrypts a block of text with XTEA
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71 @param pt The input plaintext (8 bytes)
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72 @param ct The output ciphertext (8 bytes)
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73 @param skey The key as scheduled
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74 */
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75 void xtea_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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76 {
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77 unsigned long y, z;
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78 int r;
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79
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80 LTC_ARGCHK(pt != NULL);
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81 LTC_ARGCHK(ct != NULL);
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82 LTC_ARGCHK(skey != NULL);
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83
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84 LOAD32L(y, &pt[0]);
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85 LOAD32L(z, &pt[4]);
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86 for (r = 0; r < 32; r += 4) {
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87 y = (y + ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r])) & 0xFFFFFFFFUL;
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88 z = (z + ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r])) & 0xFFFFFFFFUL;
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89
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90 y = (y + ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r+1])) & 0xFFFFFFFFUL;
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91 z = (z + ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r+1])) & 0xFFFFFFFFUL;
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92
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93 y = (y + ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r+2])) & 0xFFFFFFFFUL;
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94 z = (z + ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r+2])) & 0xFFFFFFFFUL;
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95
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96 y = (y + ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r+3])) & 0xFFFFFFFFUL;
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97 z = (z + ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r+3])) & 0xFFFFFFFFUL;
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98 }
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99 STORE32L(y, &ct[0]);
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100 STORE32L(z, &ct[4]);
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101 }
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102
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103 /**
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104 Decrypts a block of text with XTEA
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105 @param ct The input ciphertext (8 bytes)
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106 @param pt The output plaintext (8 bytes)
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107 @param skey The key as scheduled
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108 */
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109 void xtea_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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110 {
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111 unsigned long y, z;
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112 int r;
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113
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114 LTC_ARGCHK(pt != NULL);
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115 LTC_ARGCHK(ct != NULL);
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116 LTC_ARGCHK(skey != NULL);
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117
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118 LOAD32L(y, &ct[0]);
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119 LOAD32L(z, &ct[4]);
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120 for (r = 31; r >= 0; r -= 4) {
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121 z = (z - ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r])) & 0xFFFFFFFFUL;
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122 y = (y - ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r])) & 0xFFFFFFFFUL;
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123
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124 z = (z - ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r-1])) & 0xFFFFFFFFUL;
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125 y = (y - ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r-1])) & 0xFFFFFFFFUL;
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126
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127 z = (z - ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r-2])) & 0xFFFFFFFFUL;
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128 y = (y - ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r-2])) & 0xFFFFFFFFUL;
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129
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130 z = (z - ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r-3])) & 0xFFFFFFFFUL;
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131 y = (y - ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r-3])) & 0xFFFFFFFFUL;
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132 }
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133 STORE32L(y, &pt[0]);
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134 STORE32L(z, &pt[4]);
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135 }
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136
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137 /**
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138 Performs a self-test of the XTEA block cipher
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139 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
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140 */
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141 int xtea_test(void)
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142 {
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143 #ifndef LTC_TEST
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144 return CRYPT_NOP;
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145 #else
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146 static const unsigned char key[16] =
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147 { 0x78, 0x56, 0x34, 0x12, 0xf0, 0xcd, 0xcb, 0x9a,
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148 0x48, 0x37, 0x26, 0x15, 0xc0, 0xbf, 0xae, 0x9d };
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149 static const unsigned char pt[8] =
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150 { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
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151 static const unsigned char ct[8] =
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152 { 0x75, 0xd7, 0xc5, 0xbf, 0xcf, 0x58, 0xc9, 0x3f };
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153 unsigned char tmp[2][8];
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154 symmetric_key skey;
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155 int err, y;
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156
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157 if ((err = xtea_setup(key, 16, 0, &skey)) != CRYPT_OK) {
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158 return err;
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159 }
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160 xtea_ecb_encrypt(pt, tmp[0], &skey);
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161 xtea_ecb_decrypt(tmp[0], tmp[1], &skey);
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162
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163 if (memcmp(tmp[0], ct, 8) != 0 || memcmp(tmp[1], pt, 8) != 0) {
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164 return CRYPT_FAIL_TESTVECTOR;
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165 }
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166
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167 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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168 for (y = 0; y < 8; y++) tmp[0][y] = 0;
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169 for (y = 0; y < 1000; y++) xtea_ecb_encrypt(tmp[0], tmp[0], &skey);
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170 for (y = 0; y < 1000; y++) xtea_ecb_decrypt(tmp[0], tmp[0], &skey);
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171 for (y = 0; y < 8; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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172
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173 return CRYPT_OK;
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174 #endif
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175 }
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176
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177 /** Terminate the context
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178 @param skey The scheduled key
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179 */
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180 void xtea_done(symmetric_key *skey)
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181 {
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182 }
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183
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184 /**
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185 Gets suitable key size
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186 @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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187 @return CRYPT_OK if the input key size is acceptable.
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188 */
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189 int xtea_keysize(int *keysize)
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190 {
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191 LTC_ARGCHK(keysize != NULL);
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192 if (*keysize < 16) {
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193 return CRYPT_INVALID_KEYSIZE;
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194 }
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195 *keysize = 16;
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196 return CRYPT_OK;
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197 }
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198
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199
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200 #endif
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201
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202
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203