Mercurial > hg > nginx
annotate src/core/ngx_crypt.c @ 5586:db6d07dbef3c
Docs: xslt regenerated.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Fri, 28 Feb 2014 20:17:01 +0400 |
parents | 2d947c2e3ea1 |
children | 58956c644ad0 |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Maxim Dounin |
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4 */ |
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5 |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_crypt.h> |
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10 #include <ngx_md5.h> |
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11 #if (NGX_HAVE_SHA1) |
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12 #include <ngx_sha1.h> |
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13 #endif |
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14 |
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16 #if (NGX_CRYPT) |
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18 static ngx_int_t ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt, |
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19 u_char **encrypted); |
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20 static ngx_int_t ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt, |
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21 u_char **encrypted); |
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23 #if (NGX_HAVE_SHA1) |
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25 static ngx_int_t ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt, |
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26 u_char **encrypted); |
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27 static ngx_int_t ngx_crypt_sha(ngx_pool_t *pool, u_char *key, u_char *salt, |
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28 u_char **encrypted); |
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29 |
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30 #endif |
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33 static u_char *ngx_crypt_to64(u_char *p, uint32_t v, size_t n); |
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36 ngx_int_t |
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37 ngx_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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38 { |
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39 if (ngx_strncmp(salt, "$apr1$", sizeof("$apr1$") - 1) == 0) { |
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40 return ngx_crypt_apr1(pool, key, salt, encrypted); |
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41 |
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42 } else if (ngx_strncmp(salt, "{PLAIN}", sizeof("{PLAIN}") - 1) == 0) { |
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43 return ngx_crypt_plain(pool, key, salt, encrypted); |
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44 |
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45 #if (NGX_HAVE_SHA1) |
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46 } else if (ngx_strncmp(salt, "{SSHA}", sizeof("{SSHA}") - 1) == 0) { |
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47 return ngx_crypt_ssha(pool, key, salt, encrypted); |
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49 } else if (ngx_strncmp(salt, "{SHA}", sizeof("{SHA}") - 1) == 0) { |
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50 return ngx_crypt_sha(pool, key, salt, encrypted); |
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51 #endif |
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52 } |
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53 |
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54 /* fallback to libc crypt() */ |
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56 return ngx_libc_crypt(pool, key, salt, encrypted); |
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57 } |
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58 |
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60 static ngx_int_t |
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61 ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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62 { |
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63 ngx_int_t n; |
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64 ngx_uint_t i; |
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65 u_char *p, *last, final[16]; |
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66 size_t saltlen, keylen; |
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67 ngx_md5_t md5, ctx1; |
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68 |
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69 /* Apache's apr1 crypt is Paul-Henning Kamp's md5 crypt with $apr1$ magic */ |
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71 keylen = ngx_strlen(key); |
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72 |
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73 /* true salt: no magic, max 8 chars, stop at first $ */ |
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75 salt += sizeof("$apr1$") - 1; |
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76 last = salt + 8; |
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77 for (p = salt; *p && *p != '$' && p < last; p++) { /* void */ } |
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78 saltlen = p - salt; |
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79 |
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80 /* hash key and salt */ |
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81 |
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82 ngx_md5_init(&md5); |
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83 ngx_md5_update(&md5, key, keylen); |
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84 ngx_md5_update(&md5, (u_char *) "$apr1$", sizeof("$apr1$") - 1); |
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85 ngx_md5_update(&md5, salt, saltlen); |
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86 |
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87 ngx_md5_init(&ctx1); |
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88 ngx_md5_update(&ctx1, key, keylen); |
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89 ngx_md5_update(&ctx1, salt, saltlen); |
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90 ngx_md5_update(&ctx1, key, keylen); |
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91 ngx_md5_final(final, &ctx1); |
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92 |
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93 for (n = keylen; n > 0; n -= 16) { |
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94 ngx_md5_update(&md5, final, n > 16 ? 16 : n); |
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95 } |
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96 |
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97 ngx_memzero(final, sizeof(final)); |
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98 |
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99 for (i = keylen; i; i >>= 1) { |
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100 if (i & 1) { |
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101 ngx_md5_update(&md5, final, 1); |
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102 |
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103 } else { |
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104 ngx_md5_update(&md5, key, 1); |
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105 } |
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106 } |
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107 |
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108 ngx_md5_final(final, &md5); |
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109 |
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110 for (i = 0; i < 1000; i++) { |
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111 ngx_md5_init(&ctx1); |
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112 |
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113 if (i & 1) { |
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114 ngx_md5_update(&ctx1, key, keylen); |
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115 |
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116 } else { |
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117 ngx_md5_update(&ctx1, final, 16); |
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118 } |
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119 |
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120 if (i % 3) { |
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121 ngx_md5_update(&ctx1, salt, saltlen); |
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122 } |
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123 |
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124 if (i % 7) { |
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125 ngx_md5_update(&ctx1, key, keylen); |
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126 } |
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127 |
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128 if (i & 1) { |
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129 ngx_md5_update(&ctx1, final, 16); |
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130 |
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131 } else { |
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132 ngx_md5_update(&ctx1, key, keylen); |
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133 } |
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134 |
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135 ngx_md5_final(final, &ctx1); |
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136 } |
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137 |
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138 /* output */ |
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139 |
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140 *encrypted = ngx_pnalloc(pool, sizeof("$apr1$") - 1 + saltlen + 1 + 22 + 1); |
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141 if (*encrypted == NULL) { |
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142 return NGX_ERROR; |
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143 } |
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144 |
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145 p = ngx_cpymem(*encrypted, "$apr1$", sizeof("$apr1$") - 1); |
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146 p = ngx_copy(p, salt, saltlen); |
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147 *p++ = '$'; |
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148 |
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149 p = ngx_crypt_to64(p, (final[ 0]<<16) | (final[ 6]<<8) | final[12], 4); |
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150 p = ngx_crypt_to64(p, (final[ 1]<<16) | (final[ 7]<<8) | final[13], 4); |
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151 p = ngx_crypt_to64(p, (final[ 2]<<16) | (final[ 8]<<8) | final[14], 4); |
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152 p = ngx_crypt_to64(p, (final[ 3]<<16) | (final[ 9]<<8) | final[15], 4); |
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153 p = ngx_crypt_to64(p, (final[ 4]<<16) | (final[10]<<8) | final[ 5], 4); |
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154 p = ngx_crypt_to64(p, final[11], 2); |
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155 *p = '\0'; |
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156 |
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157 return NGX_OK; |
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158 } |
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159 |
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160 |
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161 static u_char * |
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162 ngx_crypt_to64(u_char *p, uint32_t v, size_t n) |
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163 { |
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164 static u_char itoa64[] = |
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165 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
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166 |
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167 while (n--) { |
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168 *p++ = itoa64[v & 0x3f]; |
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169 v >>= 6; |
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170 } |
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171 |
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172 return p; |
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173 } |
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174 |
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175 |
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176 static ngx_int_t |
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177 ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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178 { |
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179 size_t len; |
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180 u_char *p; |
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181 |
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182 len = ngx_strlen(key); |
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183 |
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184 *encrypted = ngx_pnalloc(pool, sizeof("{PLAIN}") - 1 + len + 1); |
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185 if (*encrypted == NULL) { |
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186 return NGX_ERROR; |
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187 } |
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188 |
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189 p = ngx_cpymem(*encrypted, "{PLAIN}", sizeof("{PLAIN}") - 1); |
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190 ngx_memcpy(p, key, len + 1); |
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191 |
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192 return NGX_OK; |
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193 } |
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194 |
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195 |
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196 #if (NGX_HAVE_SHA1) |
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197 |
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198 static ngx_int_t |
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199 ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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200 { |
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201 size_t len; |
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202 ngx_int_t rc; |
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203 ngx_str_t encoded, decoded; |
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204 ngx_sha1_t sha1; |
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205 |
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206 /* "{SSHA}" base64(SHA1(key salt) salt) */ |
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207 |
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208 /* decode base64 salt to find out true salt */ |
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209 |
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210 encoded.data = salt + sizeof("{SSHA}") - 1; |
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211 encoded.len = ngx_strlen(encoded.data); |
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212 |
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213 len = ngx_max(ngx_base64_decoded_length(encoded.len), 20); |
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214 |
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215 decoded.data = ngx_pnalloc(pool, len); |
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216 if (decoded.data == NULL) { |
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217 return NGX_ERROR; |
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218 } |
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219 |
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220 rc = ngx_decode_base64(&decoded, &encoded); |
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221 |
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222 if (rc != NGX_OK || decoded.len < 20) { |
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223 decoded.len = 20; |
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224 } |
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225 |
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226 /* update SHA1 from key and salt */ |
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227 |
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228 ngx_sha1_init(&sha1); |
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229 ngx_sha1_update(&sha1, key, ngx_strlen(key)); |
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230 ngx_sha1_update(&sha1, decoded.data + 20, decoded.len - 20); |
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231 ngx_sha1_final(decoded.data, &sha1); |
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232 |
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233 /* encode it back to base64 */ |
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234 |
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235 len = sizeof("{SSHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1; |
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236 |
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237 *encrypted = ngx_pnalloc(pool, len); |
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238 if (*encrypted == NULL) { |
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239 return NGX_ERROR; |
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240 } |
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241 |
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242 encoded.data = ngx_cpymem(*encrypted, "{SSHA}", sizeof("{SSHA}") - 1); |
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243 ngx_encode_base64(&encoded, &decoded); |
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244 encoded.data[encoded.len] = '\0'; |
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245 |
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246 return NGX_OK; |
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247 } |
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248 |
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249 |
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250 static ngx_int_t |
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251 ngx_crypt_sha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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252 { |
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253 size_t len; |
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254 ngx_str_t encoded, decoded; |
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255 ngx_sha1_t sha1; |
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256 u_char digest[20]; |
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257 |
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258 /* "{SHA}" base64(SHA1(key)) */ |
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259 |
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260 decoded.len = sizeof(digest); |
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261 decoded.data = digest; |
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262 |
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263 ngx_sha1_init(&sha1); |
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264 ngx_sha1_update(&sha1, key, ngx_strlen(key)); |
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265 ngx_sha1_final(digest, &sha1); |
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266 |
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267 len = sizeof("{SHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1; |
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268 |
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269 *encrypted = ngx_pnalloc(pool, len); |
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270 if (*encrypted == NULL) { |
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271 return NGX_ERROR; |
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272 } |
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273 |
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274 encoded.data = ngx_cpymem(*encrypted, "{SHA}", sizeof("{SHA}") - 1); |
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275 ngx_encode_base64(&encoded, &decoded); |
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276 encoded.data[encoded.len] = '\0'; |
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277 |
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278 return NGX_OK; |
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279 } |
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280 |
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281 #endif /* NGX_HAVE_SHA1 */ |
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282 |
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283 #endif /* NGX_CRYPT */ |