Mercurial > dropbear

annotate src/mac/pelican/pelican.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 #include "tomcrypt.h"
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12
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13 /**
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14 @file pelican.c
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15 Pelican MAC, initialize state, by Tom St Denis
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16 */
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17
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18 #ifdef PELICAN
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19
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20 #define ENCRYPT_ONLY
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21 #include "../../ciphers/aes/aes_tab.c"
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22
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23
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24 /**
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25 Initialize a Pelican state
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26 @param pelmac The Pelican state to initialize
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27 @param key The secret key
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28 @param keylen The length of the secret key (octets)
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29 @return CRYPT_OK if successful
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30 */
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31 int pelican_init(pelican_state *pelmac, const unsigned char *key, unsigned long keylen)
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32 {
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33 int err;
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34
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35 LTC_ARGCHK(pelmac != NULL);
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36 LTC_ARGCHK(key != NULL);
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37
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38 #ifdef LTC_FAST
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39 if (16 % sizeof(LTC_FAST_TYPE)) {
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40 return CRYPT_INVALID_ARG;
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41 }
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42 #endif
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43
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44 if ((err = aes_setup(key, keylen, 0, &pelmac->K)) != CRYPT_OK) {
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45 return err;
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46 }
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47
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48 zeromem(pelmac->state, 16);
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49 aes_ecb_encrypt(pelmac->state, pelmac->state, &pelmac->K);
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50 pelmac->buflen = 0;
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51
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52 return CRYPT_OK;
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53 }
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54
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55 static void four_rounds(pelican_state *pelmac)
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56 {
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57 ulong32 s0, s1, s2, s3, t0, t1, t2, t3;
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58 int r;
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59
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60 LOAD32H(s0, pelmac->state );
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61 LOAD32H(s1, pelmac->state + 4);
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62 LOAD32H(s2, pelmac->state + 8);
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63 LOAD32H(s3, pelmac->state + 12);
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64 for (r = 0; r < 4; r++) {
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65 t0 =
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66 Te0(byte(s0, 3)) ^
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67 Te1(byte(s1, 2)) ^
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68 Te2(byte(s2, 1)) ^
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69 Te3(byte(s3, 0));
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70 t1 =
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71 Te0(byte(s1, 3)) ^
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72 Te1(byte(s2, 2)) ^
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73 Te2(byte(s3, 1)) ^
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74 Te3(byte(s0, 0));
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75 t2 =
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76 Te0(byte(s2, 3)) ^
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77 Te1(byte(s3, 2)) ^
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78 Te2(byte(s0, 1)) ^
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79 Te3(byte(s1, 0));
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80 t3 =
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81 Te0(byte(s3, 3)) ^
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82 Te1(byte(s0, 2)) ^
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83 Te2(byte(s1, 1)) ^
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84 Te3(byte(s2, 0));
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85 s0 = t0; s1 = t1; s2 = t2; s3 = t3;
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86 }
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87 STORE32H(s0, pelmac->state );
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88 STORE32H(s1, pelmac->state + 4);
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89 STORE32H(s2, pelmac->state + 8);
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90 STORE32H(s3, pelmac->state + 12);
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91 }
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92
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93 /**
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94 Process a block of text through Pelican
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95 @param pelmac The Pelican MAC state
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96 @param in The input
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97 @param inlen The length input (octets)
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98 @return CRYPT_OK on success
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99 */
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100 int pelican_process(pelican_state *pelmac, const unsigned char *in, unsigned long inlen)
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101 {
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102
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103 LTC_ARGCHK(pelmac != NULL);
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104 LTC_ARGCHK(in != NULL);
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105 #ifdef LTC_FAST
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106 if (pelmac->buflen == 0) {
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107 while (inlen & ~15) {
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108 int x;
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109 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) {
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110 *((LTC_FAST_TYPE*)((unsigned char *)pelmac->state + x)) ^= *((LTC_FAST_TYPE*)((unsigned char *)in + x));
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111 }
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112 four_rounds(pelmac);
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113 in += 16;
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114 inlen -= 16;
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115 }
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116 }
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117 #endif
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118
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119 while (inlen--) {
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120 pelmac->state[pelmac->buflen++] ^= *in++;
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121 if (pelmac->buflen == 16) {
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122 four_rounds(pelmac);
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123 pelmac->buflen = 0;
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124 }
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125 }
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126 return CRYPT_OK;
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127 }
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128
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129 /**
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130 Terminate Pelican MAC
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131 @param pelmac The Pelican MAC state
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132 @param out [out] The TAG
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133 @return CRYPT_OK on sucess
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134 */
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135 int pelican_done(pelican_state *pelmac, unsigned char *out)
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136 {
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137 LTC_ARGCHK(pelmac != NULL);
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138 LTC_ARGCHK(out != NULL);
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139 if (pelmac->buflen == 16) {
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140 four_rounds(pelmac);
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141 pelmac->buflen = 0;
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142 }
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143 pelmac->state[pelmac->buflen++] ^= 0x80;
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144 aes_ecb_encrypt(pelmac->state, out, &pelmac->K);
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145 aes_done(&pelmac->K);
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146 return CRYPT_OK;
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147 }
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148
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149 #endif