Mercurial > dropbear
annotate libtomcrypt/src/mac/pelican/pelican.c @ 570:fb9a341e4454
- scp progressbar needs strlcat(), so add compat.o
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 02 Sep 2009 15:05:14 +0000 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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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.com |
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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 #define PELI_TAB |
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22 #include "../../ciphers/aes/aes_tab.c" |
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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 |
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106 /* check range */ |
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107 if (pelmac->buflen < 0 || pelmac->buflen > 15) { |
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108 return CRYPT_INVALID_ARG; |
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109 } |
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110 |
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111 #ifdef LTC_FAST |
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112 if (pelmac->buflen == 0) { |
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113 while (inlen & ~15) { |
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114 int x; |
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115 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) { |
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116 *((LTC_FAST_TYPE*)((unsigned char *)pelmac->state + x)) ^= *((LTC_FAST_TYPE*)((unsigned char *)in + x)); |
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117 } |
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118 four_rounds(pelmac); |
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119 in += 16; |
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120 inlen -= 16; |
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121 } |
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122 } |
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123 #endif |
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124 |
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125 while (inlen--) { |
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126 pelmac->state[pelmac->buflen++] ^= *in++; |
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127 if (pelmac->buflen == 16) { |
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128 four_rounds(pelmac); |
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129 pelmac->buflen = 0; |
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130 } |
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131 } |
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132 return CRYPT_OK; |
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133 } |
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134 |
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135 /** |
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136 Terminate Pelican MAC |
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137 @param pelmac The Pelican MAC state |
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138 @param out [out] The TAG |
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139 @return CRYPT_OK on sucess |
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140 */ |
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141 int pelican_done(pelican_state *pelmac, unsigned char *out) |
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142 { |
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143 LTC_ARGCHK(pelmac != NULL); |
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144 LTC_ARGCHK(out != NULL); |
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145 |
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146 /* check range */ |
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147 if (pelmac->buflen < 0 || pelmac->buflen > 16) { |
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148 return CRYPT_INVALID_ARG; |
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149 } |
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150 |
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151 if (pelmac->buflen == 16) { |
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152 four_rounds(pelmac); |
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153 pelmac->buflen = 0; |
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154 } |
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155 pelmac->state[pelmac->buflen++] ^= 0x80; |
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156 aes_ecb_encrypt(pelmac->state, out, &pelmac->K); |
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157 aes_done(&pelmac->K); |
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158 return CRYPT_OK; |
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159 } |
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160 |
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161 #endif |
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162 |
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163 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pelican/pelican.c,v $ */ |
382
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Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
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164 /* $Revision: 1.18 $ */ |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
165 /* $Date: 2006/04/02 13:19:10 $ */ |