annotate noekeon.c @ 8:059ec00f32a1 libtomcrypt

Missing ranlib in makefile for library
author Matt Johnston <matt@ucc.asn.au>
date Wed, 02 Jun 2004 08:31:25 +0000
parents d7da3b1e1540
children 5d99163f7e32
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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 /* Implementation of the Noekeon block cipher by Tom St Denis */
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12 #include "mycrypt.h"
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13
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14 #ifdef NOEKEON
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15
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16 const struct _cipher_descriptor noekeon_desc =
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17 {
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18 "noekeon",
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19 16,
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20 16, 16, 16, 16,
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21 &noekeon_setup,
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22 &noekeon_ecb_encrypt,
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23 &noekeon_ecb_decrypt,
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24 &noekeon_test,
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25 &noekeon_keysize
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26 };
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27
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28 static const ulong32 RC[] = {
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29 0x00000080UL, 0x0000001bUL, 0x00000036UL, 0x0000006cUL,
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30 0x000000d8UL, 0x000000abUL, 0x0000004dUL, 0x0000009aUL,
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31 0x0000002fUL, 0x0000005eUL, 0x000000bcUL, 0x00000063UL,
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32 0x000000c6UL, 0x00000097UL, 0x00000035UL, 0x0000006aUL,
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33 0x000000d4UL
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34 };
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35
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36
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37 #define kTHETA(a, b, c, d) \
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38 temp = a^c; temp = temp ^ ROL(temp, 8) ^ ROR(temp, 8); \
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39 b ^= temp; d ^= temp; \
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40 temp = b^d; temp = temp ^ ROL(temp, 8) ^ ROR(temp, 8); \
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41 a ^= temp; c ^= temp;
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42
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43 #define THETA(k, a, b, c, d) \
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44 temp = a^c; temp = temp ^ ROL(temp, 8) ^ ROR(temp, 8); \
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45 b ^= temp ^ k[1]; d ^= temp ^ k[3]; \
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46 temp = b^d; temp = temp ^ ROL(temp, 8) ^ ROR(temp, 8); \
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47 a ^= temp ^ k[0]; c ^= temp ^ k[2];
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48
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49 #define GAMMA(a, b, c, d) \
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50 b ^= ~(d|c); \
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51 a ^= c&b; \
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52 temp = d; d = a; a = temp;\
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53 c ^= a ^ b ^ d; \
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54 b ^= ~(d|c); \
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55 a ^= c&b;
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56
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57 #define PI1(a, b, c, d) \
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58 a = ROL(a, 1); c = ROL(c, 5); d = ROL(d, 2);
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59
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60 #define PI2(a, b, c, d) \
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61 a = ROR(a, 1); c = ROR(c, 5); d = ROR(d, 2);
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62
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63 int noekeon_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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64 {
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65 ulong32 temp;
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66
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67 _ARGCHK(key != NULL);
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68 _ARGCHK(skey != NULL);
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69
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70 if (keylen != 16) {
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71 return CRYPT_INVALID_KEYSIZE;
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72 }
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73
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74 if (num_rounds != 16 && num_rounds != 0) {
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75 return CRYPT_INVALID_ROUNDS;
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76 }
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77
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78 LOAD32H(skey->noekeon.K[0],&key[0]);
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79 LOAD32H(skey->noekeon.K[1],&key[4]);
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80 LOAD32H(skey->noekeon.K[2],&key[8]);
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81 LOAD32H(skey->noekeon.K[3],&key[12]);
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82
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83 LOAD32H(skey->noekeon.dK[0],&key[0]);
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84 LOAD32H(skey->noekeon.dK[1],&key[4]);
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85 LOAD32H(skey->noekeon.dK[2],&key[8]);
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86 LOAD32H(skey->noekeon.dK[3],&key[12]);
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87
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88 kTHETA(skey->noekeon.dK[0], skey->noekeon.dK[1], skey->noekeon.dK[2], skey->noekeon.dK[3]);
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89
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90 return CRYPT_OK;
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91 }
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92
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93 #ifdef CLEAN_STACK
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94 static void _noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key)
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95 #else
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96 void noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key)
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97 #endif
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98 {
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99 ulong32 a,b,c,d,temp;
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100 #ifdef SMALL_CODE
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101 int r;
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102 #endif
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103
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104 _ARGCHK(key != NULL);
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105 _ARGCHK(pt != NULL);
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106 _ARGCHK(ct != NULL);
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107
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108 LOAD32H(a,&pt[0]); LOAD32H(b,&pt[4]);
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109 LOAD32H(c,&pt[8]); LOAD32H(d,&pt[12]);
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110
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111 #define ROUND(i) \
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112 a ^= RC[i]; \
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113 THETA(key->noekeon.K, a,b,c,d); \
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114 PI1(a,b,c,d); \
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115 GAMMA(a,b,c,d); \
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116 PI2(a,b,c,d);
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117
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118 #ifdef SMALL_CODE
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119 for (r = 0; r < 16; ++r) {
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120 ROUND(r);
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121 }
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122 #else
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123 ROUND( 0); ROUND( 1); ROUND( 2); ROUND( 3);
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124 ROUND( 4); ROUND( 5); ROUND( 6); ROUND( 7);
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125 ROUND( 8); ROUND( 9); ROUND(10); ROUND(11);
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126 ROUND(12); ROUND(13); ROUND(14); ROUND(15);
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127 #endif
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128
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129 #undef ROUND
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130
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131 a ^= RC[16];
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132 THETA(key->noekeon.K, a, b, c, d);
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133
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134 STORE32H(a,&ct[0]); STORE32H(b,&ct[4]);
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135 STORE32H(c,&ct[8]); STORE32H(d,&ct[12]);
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136 }
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137
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138 #ifdef CLEAN_STACK
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139 void noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key)
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140 {
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141 _noekeon_ecb_encrypt(pt, ct, key);
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142 burn_stack(sizeof(ulong32) * 5 + sizeof(int));
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143 }
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144 #endif
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145
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146 #ifdef CLEAN_STACK
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147 static void _noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key)
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148 #else
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149 void noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key)
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150 #endif
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151 {
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diff changeset
152 ulong32 a,b,c,d, temp;
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153 #ifdef SMALL_CODE
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154 int r;
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155 #endif
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156
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157 _ARGCHK(key != NULL);
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158 _ARGCHK(pt != NULL);
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159 _ARGCHK(ct != NULL);
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160
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161 LOAD32H(a,&ct[0]); LOAD32H(b,&ct[4]);
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162 LOAD32H(c,&ct[8]); LOAD32H(d,&ct[12]);
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163
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164
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165 #define ROUND(i) \
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166 THETA(key->noekeon.dK, a,b,c,d); \
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167 a ^= RC[i]; \
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168 PI1(a,b,c,d); \
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169 GAMMA(a,b,c,d); \
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170 PI2(a,b,c,d);
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171
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172 #ifdef SMALL_CODE
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173 for (r = 16; r > 0; --r) {
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174 ROUND(r);
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175 }
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176 #else
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177 ROUND(16); ROUND(15); ROUND(14); ROUND(13);
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178 ROUND(12); ROUND(11); ROUND(10); ROUND( 9);
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179 ROUND( 8); ROUND( 7); ROUND( 6); ROUND( 5);
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180 ROUND( 4); ROUND( 3); ROUND( 2); ROUND( 1);
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181 #endif
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182
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183 #undef ROUND
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184
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185 THETA(key->noekeon.dK, a,b,c,d);
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186 a ^= RC[0];
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187 STORE32H(a,&pt[0]); STORE32H(b, &pt[4]);
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188 STORE32H(c,&pt[8]); STORE32H(d, &pt[12]);
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189 }
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190
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191 #ifdef CLEAN_STACK
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192 void noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key)
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193 {
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194 _noekeon_ecb_decrypt(ct, pt, key);
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195 burn_stack(sizeof(ulong32) * 5 + sizeof(int));
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196 }
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197 #endif
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198
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199 int noekeon_test(void)
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200 {
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201 #ifndef LTC_TEST
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202 return CRYPT_NOP;
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203 #else
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204 static const struct {
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205 int keylen;
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206 unsigned char key[16], pt[16], ct[16];
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207 } tests[] = {
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208 {
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209 16,
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210 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
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211 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
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212 { 0x18, 0xa6, 0xec, 0xe5, 0x28, 0xaa, 0x79, 0x73,
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213 0x28, 0xb2, 0xc0, 0x91, 0xa0, 0x2f, 0x54, 0xc5}
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214 }
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215 };
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216 symmetric_key key;
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217 unsigned char tmp[2][16];
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218 int err, i, y;
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219
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220 for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
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diff changeset
221 zeromem(&key, sizeof(key));
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222 if ((err = noekeon_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {
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223 return err;
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224 }
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225
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226 noekeon_ecb_encrypt(tests[i].pt, tmp[0], &key);
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227 noekeon_ecb_decrypt(tmp[0], tmp[1], &key);
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228 if (memcmp(tmp[0], tests[i].ct, 16) || memcmp(tmp[1], tests[i].pt, 16)) {
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diff changeset
229 #if 0
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230 printf("\n\nTest %d failed\n", i);
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diff changeset
231 if (memcmp(tmp[0], tests[i].ct, 16)) {
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232 printf("CT: ");
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233 for (i = 0; i < 16; i++) {
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234 printf("%02x ", tmp[0][i]);
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235 }
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236 printf("\n");
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237 } else {
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238 printf("PT: ");
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239 for (i = 0; i < 16; i++) {
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240 printf("%02x ", tmp[1][i]);
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241 }
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242 printf("\n");
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243 }
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244 #endif
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245 return CRYPT_FAIL_TESTVECTOR;
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246 }
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247
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248 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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249 for (y = 0; y < 16; y++) tmp[0][y] = 0;
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diff changeset
250 for (y = 0; y < 1000; y++) noekeon_ecb_encrypt(tmp[0], tmp[0], &key);
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diff changeset
251 for (y = 0; y < 1000; y++) noekeon_ecb_decrypt(tmp[0], tmp[0], &key);
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diff changeset
252 for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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diff changeset
253 }
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254 return CRYPT_OK;
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diff changeset
255 #endif
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256 }
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257
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258 int noekeon_keysize(int *desired_keysize)
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diff changeset
259 {
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260 _ARGCHK(desired_keysize != NULL);
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diff changeset
261 if (*desired_keysize < 16) {
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diff changeset
262 return CRYPT_INVALID_KEYSIZE;
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diff changeset
263 } else {
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264 *desired_keysize = 16;
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265 return CRYPT_OK;
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266 }
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267 }
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268
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269 #endif
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270