Mercurial > dropbear

annotate libtomcrypt/src/misc/pkcs5/pkcs_5_1.c @ 1820:e9854650d45b

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Clarify help text for dropbear -e environment option
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Aug 2021 23:17:34 +0800
parents 6dba84798cd5
children
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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 pkcs_5_1.c
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13 PKCS #5, Algorithm #1, Tom St Denis
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14 */
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15 #ifdef LTC_PKCS_5
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16 /**
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17 Execute PKCS #5 v1 in strict or OpenSSL EVP_BytesToKey()-compat mode.
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18
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19 PKCS#5 v1 specifies that the output key length can be no larger than
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20 the hash output length. OpenSSL unilaterally extended that by repeating
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21 the hash process on a block-by-block basis for as long as needed to make
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22 bigger keys. If you want to be compatible with KDF for e.g. "openssl enc",
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23 you'll want that.
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24
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25 If you want strict PKCS behavior, turn openssl_compat off. Or (more
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26 likely), use one of the convenience functions below.
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27
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28 @param password The password (or key)
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29 @param password_len The length of the password (octet)
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30 @param salt The salt (or nonce) which is 8 octets long
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31 @param iteration_count The PKCS #5 v1 iteration count
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32 @param hash_idx The index of the hash desired
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33 @param out [out] The destination for this algorithm
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34 @param outlen [in/out] The max size and resulting size of the algorithm output
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35 @param openssl_compat [in] Whether or not to grow the key to the buffer size ala OpenSSL
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36 @return CRYPT_OK if successful
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37 */
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38 static int _pkcs_5_alg1_common(const unsigned char *password,
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39 unsigned long password_len,
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40 const unsigned char *salt,
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41 int iteration_count, int hash_idx,
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42 unsigned char *out, unsigned long *outlen,
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43 int openssl_compat)
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44 {
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45 int err;
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46 unsigned long x;
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47 hash_state *md;
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48 unsigned char *buf;
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49 /* Storage vars in case we need to support > hashsize (OpenSSL compat) */
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50 unsigned long block = 0, iter;
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51 /* How many bytes to put in the outbut buffer (convenience calc) */
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52 unsigned long outidx = 0, nb = 0;
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53
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54 LTC_ARGCHK(password != NULL);
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55 LTC_ARGCHK(salt != NULL);
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56 LTC_ARGCHK(out != NULL);
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57 LTC_ARGCHK(outlen != NULL);
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58
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59 /* test hash IDX */
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60 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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61 return err;
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62 }
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63
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64 /* allocate memory */
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65 md = XMALLOC(sizeof(hash_state));
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66 buf = XMALLOC(MAXBLOCKSIZE);
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67 if (md == NULL || buf == NULL) {
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68 if (md != NULL) {
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69 XFREE(md);
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70 }
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71 if (buf != NULL) {
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72 XFREE(buf);
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73 }
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74 return CRYPT_MEM;
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75 }
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76
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77 while(block * hash_descriptor[hash_idx].hashsize < *outlen) {
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78
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79 /* hash initial (maybe previous hash) + password + salt */
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80 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) {
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81 goto LBL_ERR;
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82 }
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83 /* in OpenSSL mode, we first hash the previous result for blocks 2-n */
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84 if (openssl_compat && block) {
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85 if ((err = hash_descriptor[hash_idx].process(md, buf, hash_descriptor[hash_idx].hashsize)) != CRYPT_OK) {
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86 goto LBL_ERR;
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87 }
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88 }
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89 if ((err = hash_descriptor[hash_idx].process(md, password, password_len)) != CRYPT_OK) {
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90 goto LBL_ERR;
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91 }
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92 if ((err = hash_descriptor[hash_idx].process(md, salt, 8)) != CRYPT_OK) {
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93 goto LBL_ERR;
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94 }
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95 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) {
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96 goto LBL_ERR;
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97 }
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98
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99 iter = iteration_count;
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100 while (--iter) {
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101 /* code goes here. */
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102 x = MAXBLOCKSIZE;
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103 if ((err = hash_memory(hash_idx, buf, hash_descriptor[hash_idx].hashsize, buf, &x)) != CRYPT_OK) {
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104 goto LBL_ERR;
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105 }
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106 }
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107
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108 /* limit the size of the copy to however many bytes we have left in
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109 the output buffer (and how many bytes we have to copy) */
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110 outidx = block*hash_descriptor[hash_idx].hashsize;
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111 nb = hash_descriptor[hash_idx].hashsize;
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112 if(outidx+nb > *outlen)
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113 nb = *outlen - outidx;
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114 if(nb > 0)
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115 XMEMCPY(out+outidx, buf, nb);
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116
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117 block++;
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118 if (!openssl_compat)
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119 break;
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120 }
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121 /* In strict mode, we always return the hashsize, in compat we filled it
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122 as much as was requested, so we leave it alone. */
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123 if(!openssl_compat)
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124 *outlen = hash_descriptor[hash_idx].hashsize;
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125
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126 err = CRYPT_OK;
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127 LBL_ERR:
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128 #ifdef LTC_CLEAN_STACK
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129 zeromem(buf, MAXBLOCKSIZE);
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130 zeromem(md, sizeof(hash_state));
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131 #endif
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132
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133 XFREE(buf);
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134 XFREE(md);
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135
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136 return err;
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137 }
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138
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139 /**
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140 Execute PKCS #5 v1 - Strict mode (no OpenSSL-compatible extension)
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141 @param password The password (or key)
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142 @param password_len The length of the password (octet)
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143 @param salt The salt (or nonce) which is 8 octets long
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144 @param iteration_count The PKCS #5 v1 iteration count
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145 @param hash_idx The index of the hash desired
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146 @param out [out] The destination for this algorithm
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147 @param outlen [in/out] The max size and resulting size of the algorithm output
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148 @return CRYPT_OK if successful
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149 */
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150 int pkcs_5_alg1(const unsigned char *password, unsigned long password_len,
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151 const unsigned char *salt,
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152 int iteration_count, int hash_idx,
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153 unsigned char *out, unsigned long *outlen)
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154 {
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155 return _pkcs_5_alg1_common(password, password_len, salt, iteration_count,
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156 hash_idx, out, outlen, 0);
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157 }
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158
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159 /**
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160 Execute PKCS #5 v1 - OpenSSL-extension-compatible mode
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161
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162 Use this one if you need to derive keys as "openssl enc" does by default.
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163 OpenSSL (for better or worse), uses MD5 as the hash and iteration_count=1.
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164 @param password The password (or key)
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165 @param password_len The length of the password (octet)
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166 @param salt The salt (or nonce) which is 8 octets long
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167 @param iteration_count The PKCS #5 v1 iteration count
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168 @param hash_idx The index of the hash desired
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169 @param out [out] The destination for this algorithm
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170 @param outlen [in/out] The max size and resulting size of the algorithm output
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171 @return CRYPT_OK if successful
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172 */
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173 int pkcs_5_alg1_openssl(const unsigned char *password,
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174 unsigned long password_len,
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175 const unsigned char *salt,
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176 int iteration_count, int hash_idx,
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177 unsigned char *out, unsigned long *outlen)
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178 {
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179 return _pkcs_5_alg1_common(password, password_len, salt, iteration_count,
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180 hash_idx, out, outlen, 1);
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181 }
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182
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183 #endif
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184
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185 /* ref: $Format:%D$ */
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186 /* git commit: $Format:%H$ */
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187 /* commit time: $Format:%ai$ */