Mercurial > dropbear
annotate libtomcrypt/src/mac/pelican/pelican.c @ 1920:1489449eceb1
Check authorized_keys permissions as the user
This is necessary on NFS with squash root.
Based on work from Chris Dragan
This commit also tidies some trailing whitespace.
Fixes github pull #107
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 30 Mar 2022 12:56:09 +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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file pelican.c |
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13 Pelican MAC, initialize state, by Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_PELICAN |
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17 |
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18 #define __LTC_AES_TAB_C__ |
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19 #define ENCRYPT_ONLY |
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20 #define PELI_TAB |
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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 Initialize a Pelican state |
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25 @param pelmac The Pelican state to initialize |
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26 @param key The secret key |
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27 @param keylen The length of the secret key (octets) |
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28 @return CRYPT_OK if successful |
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29 */ |
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30 int pelican_init(pelican_state *pelmac, const unsigned char *key, unsigned long keylen) |
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31 { |
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32 int err; |
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33 |
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34 LTC_ARGCHK(pelmac != NULL); |
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35 LTC_ARGCHK(key != NULL); |
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36 |
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37 #ifdef LTC_FAST |
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38 if (16 % sizeof(LTC_FAST_TYPE)) { |
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39 return CRYPT_INVALID_ARG; |
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40 } |
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41 #endif |
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42 |
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43 if ((err = aes_setup(key, keylen, 0, &pelmac->K)) != CRYPT_OK) { |
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44 return err; |
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45 } |
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46 |
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47 zeromem(pelmac->state, 16); |
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48 aes_ecb_encrypt(pelmac->state, pelmac->state, &pelmac->K); |
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49 pelmac->buflen = 0; |
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50 |
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51 return CRYPT_OK; |
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52 } |
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53 |
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54 static void _four_rounds(pelican_state *pelmac) |
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55 { |
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56 ulong32 s0, s1, s2, s3, t0, t1, t2, t3; |
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57 int r; |
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58 |
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59 LOAD32H(s0, pelmac->state ); |
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60 LOAD32H(s1, pelmac->state + 4); |
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61 LOAD32H(s2, pelmac->state + 8); |
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62 LOAD32H(s3, pelmac->state + 12); |
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63 for (r = 0; r < 4; r++) { |
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64 t0 = |
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65 Te0(byte(s0, 3)) ^ |
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66 Te1(byte(s1, 2)) ^ |
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67 Te2(byte(s2, 1)) ^ |
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68 Te3(byte(s3, 0)); |
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69 t1 = |
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70 Te0(byte(s1, 3)) ^ |
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71 Te1(byte(s2, 2)) ^ |
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72 Te2(byte(s3, 1)) ^ |
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73 Te3(byte(s0, 0)); |
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74 t2 = |
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75 Te0(byte(s2, 3)) ^ |
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76 Te1(byte(s3, 2)) ^ |
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77 Te2(byte(s0, 1)) ^ |
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78 Te3(byte(s1, 0)); |
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79 t3 = |
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80 Te0(byte(s3, 3)) ^ |
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81 Te1(byte(s0, 2)) ^ |
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82 Te2(byte(s1, 1)) ^ |
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83 Te3(byte(s2, 0)); |
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84 s0 = t0; s1 = t1; s2 = t2; s3 = t3; |
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85 } |
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86 STORE32H(s0, pelmac->state ); |
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87 STORE32H(s1, pelmac->state + 4); |
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88 STORE32H(s2, pelmac->state + 8); |
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89 STORE32H(s3, pelmac->state + 12); |
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90 } |
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91 |
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92 /** |
285
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93 Process a block of text through Pelican |
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94 @param pelmac The Pelican MAC state |
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95 @param in The input |
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96 @param inlen The length input (octets) |
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97 @return CRYPT_OK on success |
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98 */ |
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99 int pelican_process(pelican_state *pelmac, const unsigned char *in, unsigned long inlen) |
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100 { |
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101 |
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102 LTC_ARGCHK(pelmac != NULL); |
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103 LTC_ARGCHK(in != NULL); |
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104 |
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105 /* check range */ |
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106 if (pelmac->buflen < 0 || pelmac->buflen > 15) { |
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107 return CRYPT_INVALID_ARG; |
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108 } |
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109 |
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110 #ifdef LTC_FAST |
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111 if (pelmac->buflen == 0) { |
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112 while (inlen & ~15) { |
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113 int x; |
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114 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) { |
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115 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pelmac->state + x)) ^= *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)in + x)); |
285
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116 } |
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117 _four_rounds(pelmac); |
285
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118 in += 16; |
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119 inlen -= 16; |
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120 } |
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121 } |
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122 #endif |
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123 |
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124 while (inlen--) { |
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125 pelmac->state[pelmac->buflen++] ^= *in++; |
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126 if (pelmac->buflen == 16) { |
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127 _four_rounds(pelmac); |
285
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128 pelmac->buflen = 0; |
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129 } |
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130 } |
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131 return CRYPT_OK; |
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132 } |
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133 |
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134 /** |
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135 Terminate Pelican MAC |
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136 @param pelmac The Pelican MAC state |
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137 @param out [out] The TAG |
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138 @return CRYPT_OK on sucess |
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139 */ |
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140 int pelican_done(pelican_state *pelmac, unsigned char *out) |
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141 { |
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142 LTC_ARGCHK(pelmac != NULL); |
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143 LTC_ARGCHK(out != NULL); |
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144 |
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145 /* check range */ |
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146 if (pelmac->buflen < 0 || pelmac->buflen > 16) { |
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147 return CRYPT_INVALID_ARG; |
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148 } |
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149 |
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150 if (pelmac->buflen == 16) { |
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151 _four_rounds(pelmac); |
285
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152 pelmac->buflen = 0; |
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153 } |
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154 pelmac->state[pelmac->buflen++] ^= 0x80; |
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155 aes_ecb_encrypt(pelmac->state, out, &pelmac->K); |
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156 aes_done(&pelmac->K); |
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157 return CRYPT_OK; |
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158 } |
285
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159 |
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160 #endif |
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161 |
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162 /* ref: $Format:%D$ */ |
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163 /* git commit: $Format:%H$ */ |
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164 /* commit time: $Format:%ai$ */ |