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annotate src/core/ngx_crypt.c @ 3922:9c057d5e1c27

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"$apr1", "{PLAIN}", and "{SSHA}" password methods in auth basic module patch by Maxim Dounin
author Igor Sysoev <igor@sysoev.ru>
date Mon, 16 May 2011 14:54:50 +0000
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children 14622ee4fa08
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3922
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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_md5.h>
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10 #if (NGX_HAVE_SHA1)
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11 #include <ngx_sha1.h>
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12 #endif
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15 static ngx_int_t ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt,
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16 u_char **encrypted);
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17 static ngx_int_t ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt,
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18 u_char **encrypted);
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19
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20 #if (NGX_HAVE_SHA1)
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21
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22 static ngx_int_t ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt,
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23 u_char **encrypted);
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24
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25 #endif
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28 static u_char *ngx_crypt_to64(u_char *p, uint32_t v, size_t n);
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30
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31 ngx_int_t
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32 ngx_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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33 {
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34 if (ngx_strncmp(salt, "$apr1$", sizeof("$apr1$") - 1) == 0) {
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35 return ngx_crypt_apr1(pool, key, salt, encrypted);
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36
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37 } else if (ngx_strncmp(salt, "{PLAIN}", sizeof("{PLAIN}") - 1) == 0) {
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38 return ngx_crypt_plain(pool, key, salt, encrypted);
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39
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40 #if (NGX_HAVE_SHA1)
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41 } else if (ngx_strncmp(salt, "{SSHA}", sizeof("{SSHA}") - 1) == 0) {
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42 return ngx_crypt_ssha(pool, key, salt, encrypted);
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43 #endif
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44 }
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45
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46 /* fallback to libc crypt() */
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47
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48 return ngx_libc_crypt(pool, key, salt, encrypted);
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49 }
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51
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52 static ngx_int_t
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53 ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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54 {
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55 ngx_int_t n;
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56 ngx_uint_t i;
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57 u_char *p, *last, final[16];
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58 size_t saltlen, keylen;
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59 ngx_md5_t md5, ctx1;
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60
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61 /* Apache's apr1 crypt is Paul-Henning Kamp's md5 crypt with $apr1$ magic */
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62
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63 keylen = ngx_strlen(key);
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64
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65 /* true salt: no magic, max 8 chars, stop at first $ */
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66
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67 salt += sizeof("$apr1$") - 1;
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68 last = salt + 8;
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69 for (p = salt; *p && *p != '$' && p < last; p++) { /* void */ }
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70 saltlen = p - salt;
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71
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72 /* hash key and salt */
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73
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74 ngx_md5_init(&md5);
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75 ngx_md5_update(&md5, key, keylen);
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76 ngx_md5_update(&md5, "$apr1$", sizeof("$apr1$") - 1);
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77 ngx_md5_update(&md5, salt, saltlen);
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78
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79 ngx_md5_init(&ctx1);
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80 ngx_md5_update(&ctx1, key, keylen);
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81 ngx_md5_update(&ctx1, salt, saltlen);
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82 ngx_md5_update(&ctx1, key, keylen);
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83 ngx_md5_final(final, &ctx1);
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84
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85 for (n = keylen; n > 0; n -= 16) {
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86 ngx_md5_update(&md5, final, n > 16 ? 16 : n);
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87 }
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88
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89 ngx_memzero(final, sizeof(final));
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90
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91 for (i = keylen; i; i >>= 1) {
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92 if (i & 1) {
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93 ngx_md5_update(&md5, final, 1);
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94
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95 } else {
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96 ngx_md5_update(&md5, key, 1);
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97 }
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98 }
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99
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100 ngx_md5_final(final, &md5);
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101
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102 for (i = 0; i < 1000; i++) {
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103 ngx_md5_init(&ctx1);
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104
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105 if (i & 1) {
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106 ngx_md5_update(&ctx1, key, keylen);
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107
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108 } else {
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109 ngx_md5_update(&ctx1, final, 16);
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110 }
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111
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112 if (i % 3) {
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113 ngx_md5_update(&ctx1, salt, saltlen);
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114 }
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115
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116 if (i % 7) {
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117 ngx_md5_update(&ctx1, key, keylen);
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118 }
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119
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120 if (i & 1) {
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121 ngx_md5_update(&ctx1, final, 16);
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122
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123 } else {
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124 ngx_md5_update(&ctx1, key, keylen);
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125 }
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126
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127 ngx_md5_final(final, &ctx1);
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128 }
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129
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130 /* output */
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131
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132 *encrypted = ngx_pnalloc(pool, sizeof("$apr1$") - 1 + saltlen + 16 + 1);
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133 if (*encrypted == NULL) {
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134 return NGX_ERROR;
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135 }
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136
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137 p = ngx_cpymem(*encrypted, "$apr1$", sizeof("$apr1$") - 1);
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138 p = ngx_copy(p, salt, saltlen);
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139 *p++ = '$';
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140
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141 p = ngx_crypt_to64(p, (final[ 0]<<16) | (final[ 6]<<8) | final[12], 4);
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142 p = ngx_crypt_to64(p, (final[ 1]<<16) | (final[ 7]<<8) | final[13], 4);
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143 p = ngx_crypt_to64(p, (final[ 2]<<16) | (final[ 8]<<8) | final[14], 4);
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144 p = ngx_crypt_to64(p, (final[ 3]<<16) | (final[ 9]<<8) | final[15], 4);
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145 p = ngx_crypt_to64(p, (final[ 4]<<16) | (final[10]<<8) | final[ 5], 4);
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146 p = ngx_crypt_to64(p, final[11], 2);
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147 *p = '\0';
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148
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149 return NGX_OK;
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150 }
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151
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152
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153 static u_char *
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154 ngx_crypt_to64(u_char *p, uint32_t v, size_t n)
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155 {
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156 static u_char itoa64[] =
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157 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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158
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159 while (n--) {
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160 *p++ = itoa64[v & 0x3f];
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161 v >>= 6;
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162 }
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163
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164 return p;
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165 }
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166
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167
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168 static ngx_int_t
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169 ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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170 {
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171 size_t len;
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172 u_char *p;
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173
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174 len = ngx_strlen(key);
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175
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176 *encrypted = ngx_pnalloc(pool, sizeof("{PLAIN}") - 1 + len + 1);
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177 if (*encrypted == NULL) {
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178 return NGX_ERROR;
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179 }
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180
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181 p = ngx_cpymem(*encrypted, "{PLAIN}", sizeof("{PLAIN}") - 1);
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182 ngx_memcpy(p, key, len + 1);
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183
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184 return NGX_OK;
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185 }
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186
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187
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188 #if (NGX_HAVE_SHA1)
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189
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190 static ngx_int_t
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191 ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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192 {
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193 size_t len;
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194 ngx_str_t encoded, decoded;
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195 ngx_sha1_t sha1;
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196
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197 /* "{SSHA}" base64(SHA1(key salt) salt) */
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198
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199 /* decode base64 salt to find out true salt */
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200
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201 encoded.data = salt + sizeof("{SSHA}") - 1;
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202 encoded.len = ngx_strlen(encoded.data);
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203
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204 decoded.data = ngx_pnalloc(pool, ngx_base64_decoded_length(encoded.len));
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205 if (decoded.data == NULL) {
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206 return NGX_ERROR;
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207 }
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208
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209 ngx_decode_base64(&decoded, &encoded);
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210
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211 /* update SHA1 from key and salt */
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212
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213 ngx_sha1_init(&sha1);
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214 ngx_sha1_update(&sha1, key, ngx_strlen(key));
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215 ngx_sha1_update(&sha1, decoded.data + 20, decoded.len - 20);
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216 ngx_sha1_final(decoded.data, &sha1);
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217
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218 /* encode it back to base64 */
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219
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220 len = sizeof("{SSHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1;
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221
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222 *encrypted = ngx_pnalloc(pool, len);
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223 if (*encrypted == NULL) {
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224 return NGX_ERROR;
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225 }
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226
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227 encoded.data = ngx_cpymem(*encrypted, "{SSHA}", sizeof("{SSHA}") - 1);
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228 ngx_encode_base64(&encoded, &decoded);
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229 encoded.data[encoded.len] = '\0';
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230
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231 return NGX_OK;
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232 }
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233
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234 #endif /* NGX_HAVE_SHA1 */