Mercurial > dropbear

annotate src/ciphers/skipjack.c @ 195:19e5d79b7190 libtomcrypt

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Cleanup of import of LTC 1.02, still problematic for Dropbear
author Matt Johnston <matt@ucc.asn.au>
date Mon, 09 May 2005 09:33:00 +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 skipjack.c
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14 Skipjack Implementation by 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 SKIPJACK
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19
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20 const struct ltc_cipher_descriptor skipjack_desc =
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21 {
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22 "skipjack",
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23 17,
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24 10, 10, 8, 32,
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25 &skipjack_setup,
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26 &skipjack_ecb_encrypt,
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27 &skipjack_ecb_decrypt,
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28 &skipjack_test,
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29 &skipjack_done,
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30 &skipjack_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 static const unsigned char sbox[256] = {
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35 0xa3,0xd7,0x09,0x83,0xf8,0x48,0xf6,0xf4,0xb3,0x21,0x15,0x78,0x99,0xb1,0xaf,0xf9,
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36 0xe7,0x2d,0x4d,0x8a,0xce,0x4c,0xca,0x2e,0x52,0x95,0xd9,0x1e,0x4e,0x38,0x44,0x28,
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37 0x0a,0xdf,0x02,0xa0,0x17,0xf1,0x60,0x68,0x12,0xb7,0x7a,0xc3,0xe9,0xfa,0x3d,0x53,
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38 0x96,0x84,0x6b,0xba,0xf2,0x63,0x9a,0x19,0x7c,0xae,0xe5,0xf5,0xf7,0x16,0x6a,0xa2,
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39 0x39,0xb6,0x7b,0x0f,0xc1,0x93,0x81,0x1b,0xee,0xb4,0x1a,0xea,0xd0,0x91,0x2f,0xb8,
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40 0x55,0xb9,0xda,0x85,0x3f,0x41,0xbf,0xe0,0x5a,0x58,0x80,0x5f,0x66,0x0b,0xd8,0x90,
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41 0x35,0xd5,0xc0,0xa7,0x33,0x06,0x65,0x69,0x45,0x00,0x94,0x56,0x6d,0x98,0x9b,0x76,
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42 0x97,0xfc,0xb2,0xc2,0xb0,0xfe,0xdb,0x20,0xe1,0xeb,0xd6,0xe4,0xdd,0x47,0x4a,0x1d,
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43 0x42,0xed,0x9e,0x6e,0x49,0x3c,0xcd,0x43,0x27,0xd2,0x07,0xd4,0xde,0xc7,0x67,0x18,
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44 0x89,0xcb,0x30,0x1f,0x8d,0xc6,0x8f,0xaa,0xc8,0x74,0xdc,0xc9,0x5d,0x5c,0x31,0xa4,
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45 0x70,0x88,0x61,0x2c,0x9f,0x0d,0x2b,0x87,0x50,0x82,0x54,0x64,0x26,0x7d,0x03,0x40,
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46 0x34,0x4b,0x1c,0x73,0xd1,0xc4,0xfd,0x3b,0xcc,0xfb,0x7f,0xab,0xe6,0x3e,0x5b,0xa5,
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47 0xad,0x04,0x23,0x9c,0x14,0x51,0x22,0xf0,0x29,0x79,0x71,0x7e,0xff,0x8c,0x0e,0xe2,
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48 0x0c,0xef,0xbc,0x72,0x75,0x6f,0x37,0xa1,0xec,0xd3,0x8e,0x62,0x8b,0x86,0x10,0xe8,
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49 0x08,0x77,0x11,0xbe,0x92,0x4f,0x24,0xc5,0x32,0x36,0x9d,0xcf,0xf3,0xa6,0xbb,0xac,
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50 0x5e,0x6c,0xa9,0x13,0x57,0x25,0xb5,0xe3,0xbd,0xa8,0x3a,0x01,0x05,0x59,0x2a,0x46
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51 };
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52
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53 /* simple x + 1 (mod 10) in one step. */
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54 static const int keystep[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
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55
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56 /* simple x - 1 (mod 10) in one step */
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57 static const int ikeystep[] = { 9, 0, 1, 2, 3, 4, 5, 6, 7, 8 };
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58
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59 /**
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60 Initialize the Skipjack block cipher
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61 @param key The symmetric key you wish to pass
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62 @param keylen The key length in bytes
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63 @param num_rounds The number of rounds desired (0 for default)
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64 @param skey The key in as scheduled by this function.
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65 @return CRYPT_OK if successful
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66 */
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67 int skipjack_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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68 {
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69 int x;
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70
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71 LTC_ARGCHK(key != NULL);
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72 LTC_ARGCHK(skey != NULL);
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73
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74 if (keylen != 10) {
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75 return CRYPT_INVALID_KEYSIZE;
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76 }
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77
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78 if (num_rounds != 32 && num_rounds != 0) {
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79 return CRYPT_INVALID_ROUNDS;
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80 }
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81
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82 /* make sure the key is in range for platforms where CHAR_BIT != 8 */
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83 for (x = 0; x < 10; x++) {
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84 skey->skipjack.key[x] = key[x] & 255;
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85 }
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86
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87 return CRYPT_OK;
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88 }
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89
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90 #define RULE_A \
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91 tmp = g_func(w1, &kp, skey->skipjack.key); \
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92 w1 = tmp ^ w4 ^ x; \
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93 w4 = w3; w3 = w2; \
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94 w2 = tmp;
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95
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96 #define RULE_B \
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97 tmp = g_func(w1, &kp, skey->skipjack.key); \
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98 tmp1 = w4; w4 = w3; \
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99 w3 = w1 ^ w2 ^ x; \
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100 w1 = tmp1; w2 = tmp;
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101
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102 #define RULE_A1 \
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103 tmp = w1 ^ w2 ^ x; \
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104 w1 = ig_func(w2, &kp, skey->skipjack.key); \
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105 w2 = w3; w3 = w4; w4 = tmp;
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106
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107 #define RULE_B1 \
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108 tmp = ig_func(w2, &kp, skey->skipjack.key); \
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109 w2 = tmp ^ w3 ^ x; \
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110 w3 = w4; w4 = w1; w1 = tmp;
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111
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112 static unsigned g_func(unsigned w, int *kp, unsigned char *key)
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113 {
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114 unsigned char g1,g2;
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115
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116 g1 = (w >> 8) & 255; g2 = w & 255;
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117 g1 ^= sbox[g2^key[*kp]]; *kp = keystep[*kp];
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118 g2 ^= sbox[g1^key[*kp]]; *kp = keystep[*kp];
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119 g1 ^= sbox[g2^key[*kp]]; *kp = keystep[*kp];
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120 g2 ^= sbox[g1^key[*kp]]; *kp = keystep[*kp];
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121 return ((unsigned)g1<<8)|(unsigned)g2;
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122 }
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123
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124 static unsigned ig_func(unsigned w, int *kp, unsigned char *key)
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125 {
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diff changeset
126 unsigned char g1,g2;
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diff changeset
127
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128 g1 = (w >> 8) & 255; g2 = w & 255;
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129 *kp = ikeystep[*kp]; g2 ^= sbox[g1^key[*kp]];
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130 *kp = ikeystep[*kp]; g1 ^= sbox[g2^key[*kp]];
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131 *kp = ikeystep[*kp]; g2 ^= sbox[g1^key[*kp]];
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132 *kp = ikeystep[*kp]; g1 ^= sbox[g2^key[*kp]];
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133 return ((unsigned)g1<<8)|(unsigned)g2;
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134 }
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135
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136 /**
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137 Encrypts a block of text with Skipjack
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138 @param pt The input plaintext (8 bytes)
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139 @param ct The output ciphertext (8 bytes)
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140 @param skey The key as scheduled
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141 */
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142 #ifdef LTC_CLEAN_STACK
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143 static void _skipjack_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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144 #else
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145 void skipjack_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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146 #endif
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147 {
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148 unsigned w1,w2,w3,w4,tmp,tmp1;
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149 int x, kp;
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150
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151 LTC_ARGCHK(pt != NULL);
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152 LTC_ARGCHK(ct != NULL);
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153 LTC_ARGCHK(skey != NULL);
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154
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155 /* load block */
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156 w1 = ((unsigned)pt[0]<<8)|pt[1];
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157 w2 = ((unsigned)pt[2]<<8)|pt[3];
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158 w3 = ((unsigned)pt[4]<<8)|pt[5];
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159 w4 = ((unsigned)pt[6]<<8)|pt[7];
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160
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161 /* 8 rounds of RULE A */
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162 for (x = 1, kp = 0; x < 9; x++) {
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163 RULE_A;
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164 }
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165
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166 /* 8 rounds of RULE B */
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167 for (; x < 17; x++) {
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168 RULE_B;
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169 }
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170
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171 /* 8 rounds of RULE A */
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172 for (; x < 25; x++) {
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173 RULE_A;
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174 }
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175
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176 /* 8 rounds of RULE B */
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177 for (; x < 33; x++) {
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178 RULE_B;
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179 }
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180
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181 /* store block */
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182 ct[0] = (w1>>8)&255; ct[1] = w1&255;
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183 ct[2] = (w2>>8)&255; ct[3] = w2&255;
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184 ct[4] = (w3>>8)&255; ct[5] = w3&255;
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185 ct[6] = (w4>>8)&255; ct[7] = w4&255;
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186 }
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187
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188 #ifdef LTC_CLEAN_STACK
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189 void skipjack_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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190 {
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191 _skipjack_ecb_encrypt(pt, ct, skey);
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192 burn_stack(sizeof(unsigned) * 8 + sizeof(int) * 2);
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193 }
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194 #endif
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195
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196 /**
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197 Decrypts a block of text with Skipjack
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198 @param ct The input ciphertext (8 bytes)
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199 @param pt The output plaintext (8 bytes)
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200 @param skey The key as scheduled
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201 */
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202 #ifdef LTC_CLEAN_STACK
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203 static void _skipjack_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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204 #else
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205 void skipjack_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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206 #endif
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207 {
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208 unsigned w1,w2,w3,w4,tmp;
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209 int x, kp;
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210
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211 LTC_ARGCHK(pt != NULL);
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diff changeset
212 LTC_ARGCHK(ct != NULL);
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213 LTC_ARGCHK(skey != NULL);
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214
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215 /* load block */
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diff changeset
216 w1 = ((unsigned)ct[0]<<8)|ct[1];
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diff changeset
217 w2 = ((unsigned)ct[2]<<8)|ct[3];
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218 w3 = ((unsigned)ct[4]<<8)|ct[5];
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219 w4 = ((unsigned)ct[6]<<8)|ct[7];
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220
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221 /* 8 rounds of RULE B^-1
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diff changeset
222
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diff changeset
223 Note the value "kp = 8" comes from "kp = (32 * 4) mod 10" where 32*4 is 128 which mod 10 is 8
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224 */
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225 for (x = 32, kp = 8; x > 24; x--) {
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226 RULE_B1;
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diff changeset
227 }
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228
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diff changeset
229 /* 8 rounds of RULE A^-1 */
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diff changeset
230 for (; x > 16; x--) {
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diff changeset
231 RULE_A1;
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diff changeset
232 }
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233
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diff changeset
234
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diff changeset
235 /* 8 rounds of RULE B^-1 */
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diff changeset
236 for (; x > 8; x--) {
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diff changeset
237 RULE_B1;
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diff changeset
238 }
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diff changeset
239
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240 /* 8 rounds of RULE A^-1 */
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parents:
diff changeset
241 for (; x > 0; x--) {
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diff changeset
242 RULE_A1;
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diff changeset
243 }
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diff changeset
244
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diff changeset
245 /* store block */
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diff changeset
246 pt[0] = (w1>>8)&255; pt[1] = w1&255;
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247 pt[2] = (w2>>8)&255; pt[3] = w2&255;
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248 pt[4] = (w3>>8)&255; pt[5] = w3&255;
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249 pt[6] = (w4>>8)&255; pt[7] = w4&255;
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250 }
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diff changeset
251
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252 #ifdef LTC_CLEAN_STACK
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diff changeset
253 void skipjack_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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254 {
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255 _skipjack_ecb_decrypt(ct, pt, skey);
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diff changeset
256 burn_stack(sizeof(unsigned) * 7 + sizeof(int) * 2);
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257 }
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diff changeset
258 #endif
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259
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260 /**
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261 Performs a self-test of the Skipjack block cipher
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262 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
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263 */
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264 int skipjack_test(void)
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265 {
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266 #ifndef LTC_TEST
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267 return CRYPT_NOP;
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268 #else
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269 static const struct {
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270 unsigned char key[10], pt[8], ct[8];
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271 } tests[] = {
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272 {
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273 { 0x00, 0x99, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 },
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274 { 0x33, 0x22, 0x11, 0x00, 0xdd, 0xcc, 0xbb, 0xaa },
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275 { 0x25, 0x87, 0xca, 0xe2, 0x7a, 0x12, 0xd3, 0x00 }
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276 }
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277 };
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278 unsigned char buf[2][8];
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279 int x, y, err;
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280 symmetric_key key;
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281
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282 for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) {
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283 /* setup key */
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284 if ((err = skipjack_setup(tests[x].key, 10, 0, &key)) != CRYPT_OK) {
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285 return err;
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286 }
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287
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288 /* encrypt and decrypt */
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289 skipjack_ecb_encrypt(tests[x].pt, buf[0], &key);
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290 skipjack_ecb_decrypt(buf[0], buf[1], &key);
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291
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292 /* compare */
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293 if (memcmp(buf[0], tests[x].ct, 8) != 0 || memcmp(buf[1], tests[x].pt, 8) != 0) {
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294 return CRYPT_FAIL_TESTVECTOR;
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295 }
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296
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297 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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298 for (y = 0; y < 8; y++) buf[0][y] = 0;
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299 for (y = 0; y < 1000; y++) skipjack_ecb_encrypt(buf[0], buf[0], &key);
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300 for (y = 0; y < 1000; y++) skipjack_ecb_decrypt(buf[0], buf[0], &key);
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301 for (y = 0; y < 8; y++) if (buf[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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302 }
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303
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304 return CRYPT_OK;
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305 #endif
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306 }
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307
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308 /** Terminate the context
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309 @param skey The scheduled key
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310 */
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311 void skipjack_done(symmetric_key *skey)
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312 {
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313 }
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314
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315 /**
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316 Gets suitable key size
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317 @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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318 @return CRYPT_OK if the input key size is acceptable.
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319 */
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320 int skipjack_keysize(int *keysize)
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321 {
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322 LTC_ARGCHK(keysize != NULL);
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323 if (*keysize < 10) {
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324 return CRYPT_INVALID_KEYSIZE;
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325 } else if (*keysize > 10) {
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326 *keysize = 10;
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327 }
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328 return CRYPT_OK;
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329 }
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330
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331 #endif