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1 /* crypto/evp/digest.c */ |
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2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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3 * All rights reserved. |
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4 * |
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5 * This package is an SSL implementation written |
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6 * by Eric Young (eay@cryptsoft.com). |
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7 * The implementation was written so as to conform with Netscapes SSL. |
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8 * |
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9 * This library is free for commercial and non-commercial use as long as |
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10 * the following conditions are aheared to. The following conditions |
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11 * apply to all code found in this distribution, be it the RC4, RSA, |
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12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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13 * included with this distribution is covered by the same copyright terms |
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14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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15 * |
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16 * Copyright remains Eric Young's, and as such any Copyright notices in |
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17 * the code are not to be removed. |
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18 * If this package is used in a product, Eric Young should be given attribution |
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19 * as the author of the parts of the library used. |
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20 * This can be in the form of a textual message at program startup or |
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21 * in documentation (online or textual) provided with the package. |
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22 * |
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23 * Redistribution and use in source and binary forms, with or without |
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24 * modification, are permitted provided that the following conditions |
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25 * are met: |
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26 * 1. Redistributions of source code must retain the copyright |
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27 * notice, this list of conditions and the following disclaimer. |
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28 * 2. Redistributions in binary form must reproduce the above copyright |
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29 * notice, this list of conditions and the following disclaimer in the |
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30 * documentation and/or other materials provided with the distribution. |
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31 * 3. All advertising materials mentioning features or use of this software |
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32 * must display the following acknowledgement: |
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33 * "This product includes cryptographic software written by |
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34 * Eric Young (eay@cryptsoft.com)" |
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35 * The word 'cryptographic' can be left out if the rouines from the library |
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36 * being used are not cryptographic related :-). |
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37 * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 * the apps directory (application code) you must include an acknowledgement: |
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39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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40 * |
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41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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51 * SUCH DAMAGE. |
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52 * |
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53 * The licence and distribution terms for any publically available version or |
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54 * derivative of this code cannot be changed. i.e. this code cannot simply be |
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55 * copied and put under another distribution licence |
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56 * [including the GNU Public Licence.] |
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57 */ |
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58 /* ==================================================================== |
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59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. |
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60 * |
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61 * Redistribution and use in source and binary forms, with or without |
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62 * modification, are permitted provided that the following conditions |
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63 * are met: |
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64 * |
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65 * 1. Redistributions of source code must retain the above copyright |
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66 * notice, this list of conditions and the following disclaimer. |
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67 * |
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68 * 2. Redistributions in binary form must reproduce the above copyright |
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69 * notice, this list of conditions and the following disclaimer in |
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70 * the documentation and/or other materials provided with the |
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71 * distribution. |
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72 * |
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73 * 3. All advertising materials mentioning features or use of this |
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74 * software must display the following acknowledgment: |
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75 * "This product includes software developed by the OpenSSL Project |
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76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
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77 * |
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78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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79 * endorse or promote products derived from this software without |
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80 * prior written permission. For written permission, please contact |
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81 * openssl-core@openssl.org. |
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82 * |
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83 * 5. Products derived from this software may not be called "OpenSSL" |
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84 * nor may "OpenSSL" appear in their names without prior written |
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85 * permission of the OpenSSL Project. |
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86 * |
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87 * 6. Redistributions of any form whatsoever must retain the following |
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88 * acknowledgment: |
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89 * "This product includes software developed by the OpenSSL Project |
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90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
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91 * |
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92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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103 * OF THE POSSIBILITY OF SUCH DAMAGE. |
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104 * ==================================================================== |
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105 * |
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106 * This product includes cryptographic software written by Eric Young |
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107 * (eay@cryptsoft.com). This product includes software written by Tim |
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108 * Hudson (tjh@cryptsoft.com). |
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109 * |
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110 */ |
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111 |
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112 #include <stdio.h> |
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113 #include "cryptlib.h" |
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114 #include <openssl/objects.h> |
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115 #include <openssl/evp.h> |
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116 #ifndef OPENSSL_NO_ENGINE |
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117 #include <openssl/engine.h> |
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118 #endif |
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119 |
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120 EXPORT_C void EVP_MD_CTX_init(EVP_MD_CTX *ctx) |
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121 { |
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122 memset(ctx,'\0',sizeof *ctx); |
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123 } |
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124 |
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125 EXPORT_C EVP_MD_CTX *EVP_MD_CTX_create(void) |
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126 { |
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127 EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx); |
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128 if(ctx==NULL) |
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129 { |
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130 return ctx; |
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131 } |
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132 EVP_MD_CTX_init(ctx); |
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133 |
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134 return ctx; |
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135 } |
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136 |
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137 EXPORT_C int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) |
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138 { |
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139 EVP_MD_CTX_init(ctx); |
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140 return EVP_DigestInit_ex(ctx, type, NULL); |
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141 } |
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142 |
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143 EXPORT_C int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) |
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144 { |
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145 EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); |
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146 #ifndef OPENSSL_NO_ENGINE |
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147 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts |
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148 * so this context may already have an ENGINE! Try to avoid releasing |
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149 * the previous handle, re-querying for an ENGINE, and having a |
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150 * reinitialisation, when it may all be unecessary. */ |
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151 if (ctx->engine && ctx->digest && (!type || |
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152 (type && (type->type == ctx->digest->type)))) |
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153 goto skip_to_init; |
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154 if (type) |
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155 { |
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156 /* Ensure an ENGINE left lying around from last time is cleared |
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157 * (the previous check attempted to avoid this if the same |
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158 * ENGINE and EVP_MD could be used). */ |
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159 if(ctx->engine) |
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160 ENGINE_finish(ctx->engine); |
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161 if(impl) |
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162 { |
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163 if (!ENGINE_init(impl)) |
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164 { |
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165 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR); |
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166 return 0; |
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167 } |
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168 } |
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169 else |
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170 /* Ask if an ENGINE is reserved for this job */ |
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171 impl = ENGINE_get_digest_engine(type->type); |
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172 if(impl) |
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173 { |
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174 /* There's an ENGINE for this job ... (apparently) */ |
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175 const EVP_MD *d = ENGINE_get_digest(impl, type->type); |
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176 if(!d) |
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177 { |
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178 /* Same comment from evp_enc.c */ |
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179 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR); |
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180 return 0; |
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181 } |
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182 /* We'll use the ENGINE's private digest definition */ |
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183 type = d; |
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184 /* Store the ENGINE functional reference so we know |
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185 * 'type' came from an ENGINE and we need to release |
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186 * it when done. */ |
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187 ctx->engine = impl; |
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188 } |
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189 else |
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190 ctx->engine = NULL; |
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191 } |
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192 else |
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193 if(!ctx->digest) |
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194 { |
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195 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET); |
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196 return 0; |
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197 } |
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198 #endif |
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199 if (ctx->digest != type) |
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200 { |
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201 if (ctx->digest && ctx->digest->ctx_size) |
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202 { if(ctx->md_data) |
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203 OPENSSL_free(ctx->md_data); |
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204 } |
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205 ctx->digest=type; |
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206 if (type->ctx_size) |
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207 { |
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208 ctx->md_data=OPENSSL_malloc(type->ctx_size); |
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209 if(ctx->md_data==NULL) |
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210 { |
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211 EVPerr(EVP_F_EVP_DIGESTINIT_EX,ERR_R_MALLOC_FAILURE); |
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212 return 0; |
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213 } |
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214 } |
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215 |
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216 } |
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217 #ifndef OPENSSL_NO_ENGINE |
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218 skip_to_init: |
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219 #endif |
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220 return ctx->digest->init(ctx); |
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221 } |
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222 |
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223 EXPORT_C int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, |
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224 size_t count) |
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225 { |
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226 return ctx->digest->update(ctx,data,count); |
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227 } |
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228 |
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229 /* The caller can assume that this removes any secret data from the context */ |
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230 EXPORT_C int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) |
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231 { |
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232 int ret; |
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233 ret = EVP_DigestFinal_ex(ctx, md, size); |
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234 EVP_MD_CTX_cleanup(ctx); |
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235 return ret; |
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236 } |
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237 |
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238 /* The caller can assume that this removes any secret data from the context */ |
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239 EXPORT_C int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) |
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240 { |
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241 int ret; |
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242 |
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243 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); |
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244 ret=ctx->digest->final(ctx,md); |
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245 if (size != NULL) |
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246 *size=ctx->digest->md_size; |
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247 if (ctx->digest->cleanup) |
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248 { |
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249 ctx->digest->cleanup(ctx); |
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250 EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); |
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251 } |
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252 if(ctx->md_data) |
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253 memset(ctx->md_data,0,ctx->digest->ctx_size); |
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254 return ret; |
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255 } |
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256 |
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257 EXPORT_C int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) |
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258 { |
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259 EVP_MD_CTX_init(out); |
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260 return EVP_MD_CTX_copy_ex(out, in); |
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261 } |
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262 |
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263 EXPORT_C int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) |
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264 { |
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265 unsigned char *tmp_buf; |
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266 if ((in == NULL) || (in->digest == NULL)) |
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267 { |
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268 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED); |
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269 return 0; |
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270 } |
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271 #ifndef OPENSSL_NO_ENGINE |
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272 /* Make sure it's safe to copy a digest context using an ENGINE */ |
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273 if (in->engine && !ENGINE_init(in->engine)) |
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274 { |
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275 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB); |
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276 return 0; |
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277 } |
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278 #endif |
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279 |
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280 if (out->digest == in->digest) |
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281 { |
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282 tmp_buf = out->md_data; |
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283 EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE); |
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284 } |
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285 else tmp_buf = NULL; |
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286 EVP_MD_CTX_cleanup(out); |
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287 memcpy(out,in,sizeof *out); |
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288 |
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289 if (out->digest->ctx_size) |
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290 { |
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291 if (tmp_buf) out->md_data = tmp_buf; |
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292 else out->md_data=OPENSSL_malloc(out->digest->ctx_size); |
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293 if(out->md_data==NULL||in->md_data==NULL) |
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294 { |
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295 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE); |
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296 return 0; |
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297 } |
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298 memcpy(out->md_data,in->md_data,out->digest->ctx_size); |
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299 } |
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300 |
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301 if (out->digest->copy) |
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302 return out->digest->copy(out,in); |
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303 |
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304 return 1; |
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305 } |
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306 |
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307 EXPORT_C int EVP_Digest(const void *data, size_t count, |
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308 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) |
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309 { |
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310 EVP_MD_CTX ctx; |
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311 int ret; |
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312 |
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313 EVP_MD_CTX_init(&ctx); |
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314 EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT); |
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315 ret=EVP_DigestInit_ex(&ctx, type, impl) |
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316 && EVP_DigestUpdate(&ctx, data, count) |
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317 && EVP_DigestFinal_ex(&ctx, md, size); |
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318 EVP_MD_CTX_cleanup(&ctx); |
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319 |
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320 return ret; |
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321 } |
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322 |
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323 EXPORT_C void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) |
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324 { |
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325 EVP_MD_CTX_cleanup(ctx); |
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326 OPENSSL_free(ctx); |
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327 } |
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328 |
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329 /* This call frees resources associated with the context */ |
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330 EXPORT_C int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) |
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331 { |
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332 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, |
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333 * because sometimes only copies of the context are ever finalised. |
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334 */ |
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335 if (ctx->digest && ctx->digest->cleanup |
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336 && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED)) |
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337 ctx->digest->cleanup(ctx); |
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338 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data |
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339 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) |
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340 { |
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341 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size); |
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342 OPENSSL_free(ctx->md_data); |
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343 } |
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344 #ifndef OPENSSL_NO_ENGINE |
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345 if(ctx->engine) |
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346 /* The EVP_MD we used belongs to an ENGINE, release the |
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347 * functional reference we held for this reason. */ |
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348 ENGINE_finish(ctx->engine); |
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349 #endif |
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350 memset(ctx,'\0',sizeof *ctx); |
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351 |
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352 return 1; |
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353 } |