Mercurial > dropbear
annotate libtomcrypt/src/hashes/chc/chc.c @ 1930:299f4f19ba19
Add /usr/sbin and /sbin to default root PATH
When dropbear is used in a very restricted environment (such as in a
initrd), the default user shell is often also very restricted
and doesn't take care of setting the PATH so the user ends up
with the PATH set by dropbear. Unfortunately, dropbear always
sets "/usr/bin:/bin" as default PATH even for the root user
which should have /usr/sbin and /sbin too.
For a concrete instance of this problem, see the "Remote Unlocking"
section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/
It speaks of a bug in the initramfs script because it's written "blkid"
instead of "/sbin/blkid"... this is just because the scripts from the
initramfs do not expect to have a PATH without the sbin directories and
because dropbear is not setting the PATH appropriately for the root user.
I'm thus suggesting to use the attached patch to fix this misbehaviour (I
did not test it, but it's easy enough). It might seem anecdotic but
multiple Kali users have been bitten by this.
From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author | Raphael Hertzog <hertzog@debian.org> |
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date | Mon, 09 Jul 2018 16:27:53 +0200 |
parents | 6dba84798cd5 |
children |
rev | line source |
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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 |
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10 #include "tomcrypt.h" |
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11 |
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12 /** |
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13 @file chc.c |
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14 CHC support. (Tom St Denis) |
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15 */ |
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16 |
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17 #ifdef LTC_CHC_HASH |
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18 |
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19 #define UNDEFED_HASH -17 |
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20 |
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21 /* chc settings */ |
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22 static int cipher_idx=UNDEFED_HASH, /* which cipher */ |
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23 cipher_blocksize; /* blocksize of cipher */ |
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24 |
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25 |
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26 const struct ltc_hash_descriptor chc_desc = { |
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27 "chc_hash", 12, 0, 0, { 0 }, 0, |
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28 &chc_init, |
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29 &chc_process, |
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30 &chc_done, |
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31 &chc_test, |
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32 NULL |
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33 }; |
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34 |
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35 /** |
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36 Initialize the CHC state with a given cipher |
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37 @param cipher The index of the cipher you wish to bind |
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38 @return CRYPT_OK if successful |
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39 */ |
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40 int chc_register(int cipher) |
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41 { |
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42 int err, kl, idx; |
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43 |
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44 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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45 return err; |
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46 } |
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47 |
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48 /* will it be valid? */ |
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49 kl = cipher_descriptor[cipher].block_length; |
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50 |
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51 /* must be >64 bit block */ |
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52 if (kl <= 8) { |
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53 return CRYPT_INVALID_CIPHER; |
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54 } |
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55 |
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56 /* can we use the ideal keysize? */ |
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57 if ((err = cipher_descriptor[cipher].keysize(&kl)) != CRYPT_OK) { |
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58 return err; |
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59 } |
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60 /* we require that key size == block size be a valid choice */ |
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61 if (kl != cipher_descriptor[cipher].block_length) { |
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62 return CRYPT_INVALID_CIPHER; |
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63 } |
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64 |
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65 /* determine if chc_hash has been register_hash'ed already */ |
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66 if ((err = hash_is_valid(idx = find_hash("chc_hash"))) != CRYPT_OK) { |
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67 return err; |
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68 } |
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69 |
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70 /* store into descriptor */ |
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71 hash_descriptor[idx].hashsize = |
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72 hash_descriptor[idx].blocksize = cipher_descriptor[cipher].block_length; |
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73 |
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74 /* store the idx and block size */ |
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75 cipher_idx = cipher; |
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76 cipher_blocksize = cipher_descriptor[cipher].block_length; |
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77 return CRYPT_OK; |
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78 } |
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79 |
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80 /** |
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81 Initialize the hash state |
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82 @param md The hash state you wish to initialize |
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83 @return CRYPT_OK if successful |
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84 */ |
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85 int chc_init(hash_state *md) |
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86 { |
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87 symmetric_key *key; |
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88 unsigned char buf[MAXBLOCKSIZE]; |
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89 int err; |
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90 |
285
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91 LTC_ARGCHK(md != NULL); |
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92 |
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93 /* is the cipher valid? */ |
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94 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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95 return err; |
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96 } |
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97 |
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98 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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99 return CRYPT_INVALID_CIPHER; |
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100 } |
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101 |
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102 if ((key = XMALLOC(sizeof(*key))) == NULL) { |
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103 return CRYPT_MEM; |
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104 } |
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105 |
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106 /* zero key and what not */ |
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107 zeromem(buf, cipher_blocksize); |
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108 if ((err = cipher_descriptor[cipher_idx].setup(buf, cipher_blocksize, 0, key)) != CRYPT_OK) { |
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109 XFREE(key); |
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110 return err; |
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111 } |
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112 |
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113 /* encrypt zero block */ |
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114 cipher_descriptor[cipher_idx].ecb_encrypt(buf, md->chc.state, key); |
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115 |
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116 /* zero other members */ |
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117 md->chc.length = 0; |
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118 md->chc.curlen = 0; |
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119 zeromem(md->chc.buf, sizeof(md->chc.buf)); |
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120 XFREE(key); |
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121 return CRYPT_OK; |
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122 } |
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123 |
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124 /* |
285
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125 key <= state |
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126 T0,T1 <= block |
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127 T0 <= encrypt T0 |
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128 state <= state xor T0 xor T1 |
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129 */ |
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130 static int chc_compress(hash_state *md, unsigned char *buf) |
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131 { |
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132 unsigned char T[2][MAXBLOCKSIZE]; |
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133 symmetric_key *key; |
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134 int err, x; |
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135 |
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136 if ((key = XMALLOC(sizeof(*key))) == NULL) { |
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137 return CRYPT_MEM; |
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138 } |
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139 if ((err = cipher_descriptor[cipher_idx].setup(md->chc.state, cipher_blocksize, 0, key)) != CRYPT_OK) { |
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140 XFREE(key); |
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141 return err; |
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142 } |
382
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143 XMEMCPY(T[1], buf, cipher_blocksize); |
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144 cipher_descriptor[cipher_idx].ecb_encrypt(buf, T[0], key); |
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145 for (x = 0; x < cipher_blocksize; x++) { |
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146 md->chc.state[x] ^= T[0][x] ^ T[1][x]; |
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147 } |
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148 #ifdef LTC_CLEAN_STACK |
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149 zeromem(T, sizeof(T)); |
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150 zeromem(key, sizeof(*key)); |
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151 #endif |
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152 XFREE(key); |
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153 return CRYPT_OK; |
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154 } |
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155 |
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156 /** |
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157 Function for processing blocks |
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158 @param md The hash state |
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159 @param buf The data to hash |
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160 @param len The length of the data (octets) |
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161 @return CRYPT_OK if successful |
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162 */ |
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163 static int _chc_process(hash_state * md, const unsigned char *buf, unsigned long len); |
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164 static HASH_PROCESS(_chc_process, chc_compress, chc, (unsigned long)cipher_blocksize) |
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165 |
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166 /** |
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167 Process a block of memory though the hash |
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168 @param md The hash state |
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169 @param in The data to hash |
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170 @param inlen The length of the data (octets) |
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171 @return CRYPT_OK if successful |
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172 */ |
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173 int chc_process(hash_state * md, const unsigned char *in, unsigned long inlen) |
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174 { |
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175 int err; |
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176 |
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177 LTC_ARGCHK(md != NULL); |
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178 LTC_ARGCHK(in != NULL); |
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179 |
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180 /* is the cipher valid? */ |
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181 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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182 return err; |
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183 } |
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184 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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185 return CRYPT_INVALID_CIPHER; |
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186 } |
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187 |
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188 return _chc_process(md, in, inlen); |
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189 } |
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190 |
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191 /** |
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192 Terminate the hash to get the digest |
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193 @param md The hash state |
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194 @param out [out] The destination of the hash (length of the block size of the block cipher) |
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195 @return CRYPT_OK if successful |
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196 */ |
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197 int chc_done(hash_state *md, unsigned char *out) |
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198 { |
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199 int err; |
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200 |
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201 LTC_ARGCHK(md != NULL); |
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202 LTC_ARGCHK(out != NULL); |
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203 |
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204 /* is the cipher valid? */ |
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205 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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206 return err; |
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207 } |
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208 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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209 return CRYPT_INVALID_CIPHER; |
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210 } |
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211 |
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212 if (md->chc.curlen >= sizeof(md->chc.buf)) { |
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213 return CRYPT_INVALID_ARG; |
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214 } |
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215 |
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216 /* increase the length of the message */ |
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217 md->chc.length += md->chc.curlen * 8; |
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218 |
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219 /* append the '1' bit */ |
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220 md->chc.buf[md->chc.curlen++] = (unsigned char)0x80; |
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221 |
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222 /* if the length is currently above l-8 bytes we append zeros |
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223 * then compress. Then we can fall back to padding zeros and length |
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224 * encoding like normal. |
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225 */ |
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226 if (md->chc.curlen > (unsigned long)(cipher_blocksize - 8)) { |
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227 while (md->chc.curlen < (unsigned long)cipher_blocksize) { |
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228 md->chc.buf[md->chc.curlen++] = (unsigned char)0; |
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229 } |
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230 chc_compress(md, md->chc.buf); |
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231 md->chc.curlen = 0; |
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232 } |
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233 |
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234 /* pad upto l-8 bytes of zeroes */ |
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235 while (md->chc.curlen < (unsigned long)(cipher_blocksize - 8)) { |
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236 md->chc.buf[md->chc.curlen++] = (unsigned char)0; |
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237 } |
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238 |
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239 /* store length */ |
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240 STORE64L(md->chc.length, md->chc.buf+(cipher_blocksize-8)); |
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241 chc_compress(md, md->chc.buf); |
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242 |
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243 /* copy output */ |
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244 XMEMCPY(out, md->chc.state, cipher_blocksize); |
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245 |
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246 #ifdef LTC_CLEAN_STACK |
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247 zeromem(md, sizeof(hash_state)); |
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248 #endif |
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249 return CRYPT_OK; |
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250 } |
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251 |
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252 /** |
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253 Self-test the hash |
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254 @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled |
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255 */ |
285
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256 int chc_test(void) |
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257 { |
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258 #ifndef LTC_TEST |
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259 return CRYPT_NOP; |
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260 #else |
285
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261 static const struct { |
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262 unsigned char *msg, |
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263 hash[MAXBLOCKSIZE]; |
285
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264 int len; |
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265 } tests[] = { |
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266 { |
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267 (unsigned char *)"hello world", |
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268 { 0xcf, 0x57, 0x9d, 0xc3, 0x0a, 0x0e, 0xea, 0x61, |
285
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269 0x0d, 0x54, 0x47, 0xc4, 0x3c, 0x06, 0xf5, 0x4e }, |
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270 16 |
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271 } |
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272 }; |
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273 int i, oldhashidx, idx; |
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274 unsigned char tmp[MAXBLOCKSIZE]; |
285
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275 hash_state md; |
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276 |
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277 /* AES can be under rijndael or aes... try to find it */ |
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278 if ((idx = find_cipher("aes")) == -1) { |
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279 if ((idx = find_cipher("rijndael")) == -1) { |
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280 return CRYPT_NOP; |
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281 } |
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282 } |
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283 oldhashidx = cipher_idx; |
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284 chc_register(idx); |
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285 |
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286 for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) { |
285
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287 chc_init(&md); |
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288 chc_process(&md, tests[i].msg, strlen((char *)tests[i].msg)); |
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289 chc_done(&md, tmp); |
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290 if (compare_testvector(tmp, tests[i].len, tests[i].hash, tests[i].len, "CHC", i)) { |
285
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291 return CRYPT_FAIL_TESTVECTOR; |
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292 } |
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293 } |
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294 if (oldhashidx != UNDEFED_HASH) { |
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295 chc_register(oldhashidx); |
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296 } |
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297 |
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298 return CRYPT_OK; |
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299 #endif |
285
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300 } |
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301 |
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302 #endif |
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303 |
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304 /* ref: $Format:%D$ */ |
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305 /* git commit: $Format:%H$ */ |
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306 /* commit time: $Format:%ai$ */ |