Mercurial > dropbear
annotate libtomcrypt/src/ciphers/xtea.c @ 1750:7cb8bc5ce8b9
Don't sort objects, it breaks -lcrypt ordering
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 20 Oct 2020 23:33:45 +0800 |
parents | 6dba84798cd5 |
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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 /** |
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11 @file xtea.c |
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12 Implementation of LTC_XTEA, Tom St Denis |
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13 */ |
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14 #include "tomcrypt.h" |
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15 |
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16 #ifdef LTC_XTEA |
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17 |
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18 const struct ltc_cipher_descriptor xtea_desc = |
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19 { |
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20 "xtea", |
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21 1, |
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22 16, 16, 8, 32, |
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23 &xtea_setup, |
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24 &xtea_ecb_encrypt, |
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25 &xtea_ecb_decrypt, |
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26 &xtea_test, |
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27 &xtea_done, |
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28 &xtea_keysize, |
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29 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL |
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30 }; |
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31 |
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32 int xtea_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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33 { |
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34 ulong32 x, sum, K[4]; |
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35 |
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36 LTC_ARGCHK(key != NULL); |
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37 LTC_ARGCHK(skey != NULL); |
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38 |
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39 /* check arguments */ |
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40 if (keylen != 16) { |
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41 return CRYPT_INVALID_KEYSIZE; |
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42 } |
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43 |
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44 if (num_rounds != 0 && num_rounds != 32) { |
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45 return CRYPT_INVALID_ROUNDS; |
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46 } |
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47 |
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48 /* load key */ |
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49 LOAD32H(K[0], key+0); |
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50 LOAD32H(K[1], key+4); |
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51 LOAD32H(K[2], key+8); |
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52 LOAD32H(K[3], key+12); |
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53 |
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54 for (x = sum = 0; x < 32; x++) { |
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55 skey->xtea.A[x] = (sum + K[sum&3]) & 0xFFFFFFFFUL; |
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56 sum = (sum + 0x9E3779B9UL) & 0xFFFFFFFFUL; |
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57 skey->xtea.B[x] = (sum + K[(sum>>11)&3]) & 0xFFFFFFFFUL; |
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58 } |
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59 |
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60 #ifdef LTC_CLEAN_STACK |
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61 zeromem(&K, sizeof(K)); |
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62 #endif |
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63 |
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64 return CRYPT_OK; |
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65 } |
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66 |
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67 /** |
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68 Encrypts a block of text with LTC_XTEA |
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69 @param pt The input plaintext (8 bytes) |
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70 @param ct The output ciphertext (8 bytes) |
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71 @param skey The key as scheduled |
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72 @return CRYPT_OK if successful |
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73 */ |
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74 int xtea_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
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75 { |
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76 ulong32 y, z; |
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77 int r; |
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78 |
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79 LTC_ARGCHK(pt != NULL); |
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80 LTC_ARGCHK(ct != NULL); |
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81 LTC_ARGCHK(skey != NULL); |
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82 |
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83 LOAD32H(y, &pt[0]); |
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84 LOAD32H(z, &pt[4]); |
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85 for (r = 0; r < 32; r += 4) { |
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86 y = (y + ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r])) & 0xFFFFFFFFUL; |
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87 z = (z + ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r])) & 0xFFFFFFFFUL; |
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88 |
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89 y = (y + ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r+1])) & 0xFFFFFFFFUL; |
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90 z = (z + ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r+1])) & 0xFFFFFFFFUL; |
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91 |
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92 y = (y + ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r+2])) & 0xFFFFFFFFUL; |
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93 z = (z + ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r+2])) & 0xFFFFFFFFUL; |
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94 |
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95 y = (y + ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r+3])) & 0xFFFFFFFFUL; |
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96 z = (z + ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r+3])) & 0xFFFFFFFFUL; |
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97 } |
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98 STORE32H(y, &ct[0]); |
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99 STORE32H(z, &ct[4]); |
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100 return CRYPT_OK; |
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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 LTC_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 @return CRYPT_OK if successful |
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109 */ |
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110 int xtea_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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111 { |
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112 ulong32 y, z; |
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113 int r; |
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114 |
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115 LTC_ARGCHK(pt != NULL); |
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116 LTC_ARGCHK(ct != NULL); |
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117 LTC_ARGCHK(skey != NULL); |
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118 |
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119 LOAD32H(y, &ct[0]); |
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120 LOAD32H(z, &ct[4]); |
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121 for (r = 31; r >= 0; r -= 4) { |
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122 z = (z - ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r])) & 0xFFFFFFFFUL; |
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123 y = (y - ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r])) & 0xFFFFFFFFUL; |
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124 |
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125 z = (z - ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r-1])) & 0xFFFFFFFFUL; |
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126 y = (y - ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r-1])) & 0xFFFFFFFFUL; |
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127 |
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128 z = (z - ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r-2])) & 0xFFFFFFFFUL; |
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129 y = (y - ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r-2])) & 0xFFFFFFFFUL; |
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130 |
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131 z = (z - ((((y<<4)^(y>>5)) + y) ^ skey->xtea.B[r-3])) & 0xFFFFFFFFUL; |
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132 y = (y - ((((z<<4)^(z>>5)) + z) ^ skey->xtea.A[r-3])) & 0xFFFFFFFFUL; |
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133 } |
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134 STORE32H(y, &pt[0]); |
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135 STORE32H(z, &pt[4]); |
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136 return CRYPT_OK; |
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137 } |
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138 |
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139 /** |
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140 Performs a self-test of the LTC_XTEA block cipher |
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141 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled |
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142 */ |
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143 int xtea_test(void) |
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144 { |
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145 #ifndef LTC_TEST |
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146 return CRYPT_NOP; |
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147 #else |
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148 static const struct { |
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149 unsigned char key[16], pt[8], ct[8]; |
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150 } tests[] = { |
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151 { |
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152 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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153 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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154 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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155 { 0xde, 0xe9, 0xd4, 0xd8, 0xf7, 0x13, 0x1e, 0xd9 } |
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156 }, { |
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157 { 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, |
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158 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04 }, |
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159 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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160 { 0xa5, 0x97, 0xab, 0x41, 0x76, 0x01, 0x4d, 0x72 } |
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161 }, { |
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162 { 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04, |
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163 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x06 }, |
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164 { 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02 }, |
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165 { 0xb1, 0xfd, 0x5d, 0xa9, 0xcc, 0x6d, 0xc9, 0xdc } |
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166 }, { |
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167 { 0x78, 0x69, 0x5a, 0x4b, 0x3c, 0x2d, 0x1e, 0x0f, |
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168 0xf0, 0xe1, 0xd2, 0xc3, 0xb4, 0xa5, 0x96, 0x87 }, |
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169 { 0xf0, 0xe1, 0xd2, 0xc3, 0xb4, 0xa5, 0x96, 0x87 }, |
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170 { 0x70, 0x4b, 0x31, 0x34, 0x47, 0x44, 0xdf, 0xab } |
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171 }, { |
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172 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
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173 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, |
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174 { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 }, |
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175 { 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 } |
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176 }, { |
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177 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
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178 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, |
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179 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }, |
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180 { 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 } |
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181 }, { |
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182 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
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183 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, |
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184 { 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f }, |
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185 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 } |
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186 }, { |
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187 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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188 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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189 { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 }, |
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190 { 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 } |
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191 }, { |
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192 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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193 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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194 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }, |
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195 { 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d } |
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196 }, { |
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197 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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198 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
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199 { 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }, |
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200 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 } |
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201 } |
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202 }; |
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203 unsigned char tmp[2][8]; |
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204 symmetric_key skey; |
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205 int i, err, y; |
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206 for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) { |
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207 zeromem(&skey, sizeof(skey)); |
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208 if ((err = xtea_setup(tests[i].key, 16, 0, &skey)) != CRYPT_OK) { |
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209 return err; |
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210 } |
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211 xtea_ecb_encrypt(tests[i].pt, tmp[0], &skey); |
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212 xtea_ecb_decrypt(tmp[0], tmp[1], &skey); |
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213 |
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214 if (compare_testvector(tmp[0], 8, tests[i].ct, 8, "XTEA Encrypt", i) != 0 || |
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215 compare_testvector(tmp[1], 8, tests[i].pt, 8, "XTEA Decrypt", i) != 0) { |
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216 return CRYPT_FAIL_TESTVECTOR; |
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217 } |
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218 |
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219 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */ |
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220 for (y = 0; y < 8; y++) tmp[0][y] = 0; |
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221 for (y = 0; y < 1000; y++) xtea_ecb_encrypt(tmp[0], tmp[0], &skey); |
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222 for (y = 0; y < 1000; y++) xtea_ecb_decrypt(tmp[0], tmp[0], &skey); |
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223 for (y = 0; y < 8; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; |
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224 } /* for */ |
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225 |
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226 return CRYPT_OK; |
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227 #endif |
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228 } |
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229 |
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230 /** Terminate the context |
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231 @param skey The scheduled key |
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232 */ |
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233 void xtea_done(symmetric_key *skey) |
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234 { |
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235 LTC_UNUSED_PARAM(skey); |
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236 } |
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237 |
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238 /** |
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239 Gets suitable key size |
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240 @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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241 @return CRYPT_OK if the input key size is acceptable. |
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242 */ |
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243 int xtea_keysize(int *keysize) |
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244 { |
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245 LTC_ARGCHK(keysize != NULL); |
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246 if (*keysize < 16) { |
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247 return CRYPT_INVALID_KEYSIZE; |
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248 } |
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249 *keysize = 16; |
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250 return CRYPT_OK; |
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251 } |
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252 |
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253 |
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254 #endif |
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255 |
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256 |
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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
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257 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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changeset
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258 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
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259 /* ref: $Format:%D$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
260 /* git commit: $Format:%H$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
261 /* commit time: $Format:%ai$ */ |