1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 | #include "internal/cryptlib.h"
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12 | #include <openssl/objects.h>
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13 | #include <openssl/evp.h>
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14 | #include <openssl/engine.h>
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15 | #include "internal/evp_int.h"
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16 | #include "evp_locl.h"
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17 |
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18 | /* This call frees resources associated with the context */
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19 | int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
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20 | {
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21 | if (ctx == NULL)
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22 | return 1;
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23 |
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24 | /*
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25 | * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
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26 | * sometimes only copies of the context are ever finalised.
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27 | */
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28 | if (ctx->digest && ctx->digest->cleanup
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29 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
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30 | ctx->digest->cleanup(ctx);
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31 | if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
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32 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
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33 | OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
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34 | }
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35 | EVP_PKEY_CTX_free(ctx->pctx);
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36 | #ifndef OPENSSL_NO_ENGINE
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37 | ENGINE_finish(ctx->engine);
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38 | #endif
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39 | OPENSSL_cleanse(ctx, sizeof(*ctx));
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40 |
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41 | return 1;
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42 | }
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43 |
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44 | EVP_MD_CTX *EVP_MD_CTX_new(void)
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45 | {
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46 | return OPENSSL_zalloc(sizeof(EVP_MD_CTX));
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47 | }
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48 |
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49 | void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
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50 | {
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51 | EVP_MD_CTX_reset(ctx);
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52 | OPENSSL_free(ctx);
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53 | }
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54 |
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55 | int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
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56 | {
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57 | EVP_MD_CTX_reset(ctx);
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58 | return EVP_DigestInit_ex(ctx, type, NULL);
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59 | }
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60 |
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61 | int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
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62 | {
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63 | EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
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64 | #ifndef OPENSSL_NO_ENGINE
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65 | /*
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66 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
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67 | * this context may already have an ENGINE! Try to avoid releasing the
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68 | * previous handle, re-querying for an ENGINE, and having a
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69 | * reinitialisation, when it may all be unnecessary.
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70 | */
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71 | if (ctx->engine && ctx->digest &&
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72 | (type == NULL || (type->type == ctx->digest->type)))
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73 | goto skip_to_init;
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74 | if (type) {
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75 | /*
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76 | * Ensure an ENGINE left lying around from last time is cleared (the
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77 | * previous check attempted to avoid this if the same ENGINE and
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78 | * EVP_MD could be used).
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79 | */
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80 | ENGINE_finish(ctx->engine);
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81 | if (impl != NULL) {
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82 | if (!ENGINE_init(impl)) {
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83 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
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84 | return 0;
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85 | }
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86 | } else {
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87 | /* Ask if an ENGINE is reserved for this job */
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88 | impl = ENGINE_get_digest_engine(type->type);
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89 | }
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90 | if (impl != NULL) {
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91 | /* There's an ENGINE for this job ... (apparently) */
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92 | const EVP_MD *d = ENGINE_get_digest(impl, type->type);
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93 |
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94 | if (d == NULL) {
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95 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
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96 | ENGINE_finish(impl);
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97 | return 0;
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98 | }
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99 | /* We'll use the ENGINE's private digest definition */
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100 | type = d;
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101 | /*
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102 | * Store the ENGINE functional reference so we know 'type' came
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103 | * from an ENGINE and we need to release it when done.
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104 | */
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105 | ctx->engine = impl;
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106 | } else
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107 | ctx->engine = NULL;
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108 | } else {
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109 | if (!ctx->digest) {
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110 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET);
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111 | return 0;
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112 | }
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113 | type = ctx->digest;
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114 | }
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115 | #endif
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116 | if (ctx->digest != type) {
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117 | if (ctx->digest && ctx->digest->ctx_size) {
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118 | OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
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119 | ctx->md_data = NULL;
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120 | }
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121 | ctx->digest = type;
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122 | if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
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123 | ctx->update = type->update;
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124 | ctx->md_data = OPENSSL_zalloc(type->ctx_size);
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125 | if (ctx->md_data == NULL) {
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126 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE);
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127 | return 0;
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128 | }
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129 | }
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130 | }
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131 | #ifndef OPENSSL_NO_ENGINE
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132 | skip_to_init:
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133 | #endif
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134 | if (ctx->pctx) {
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135 | int r;
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136 | r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
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137 | EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
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138 | if (r <= 0 && (r != -2))
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139 | return 0;
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140 | }
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141 | if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
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142 | return 1;
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143 | return ctx->digest->init(ctx);
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144 | }
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145 |
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146 | int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
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147 | {
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148 | return ctx->update(ctx, data, count);
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149 | }
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150 |
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151 | /* The caller can assume that this removes any secret data from the context */
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152 | int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
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153 | {
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154 | int ret;
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155 | ret = EVP_DigestFinal_ex(ctx, md, size);
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156 | EVP_MD_CTX_reset(ctx);
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157 | return ret;
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158 | }
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159 |
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160 | /* The caller can assume that this removes any secret data from the context */
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161 | int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
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162 | {
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163 | int ret;
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164 |
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165 | OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
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166 | ret = ctx->digest->final(ctx, md);
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167 | if (size != NULL)
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168 | *size = ctx->digest->md_size;
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169 | if (ctx->digest->cleanup) {
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170 | ctx->digest->cleanup(ctx);
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171 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
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172 | }
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173 | OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
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174 | return ret;
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175 | }
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176 |
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177 | int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
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178 | {
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179 | EVP_MD_CTX_reset(out);
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180 | return EVP_MD_CTX_copy_ex(out, in);
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181 | }
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182 |
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183 | int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
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184 | {
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185 | unsigned char *tmp_buf;
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186 | if ((in == NULL) || (in->digest == NULL)) {
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187 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED);
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188 | return 0;
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189 | }
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190 | #ifndef OPENSSL_NO_ENGINE
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191 | /* Make sure it's safe to copy a digest context using an ENGINE */
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192 | if (in->engine && !ENGINE_init(in->engine)) {
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193 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB);
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194 | return 0;
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195 | }
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196 | #endif
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197 |
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198 | if (out->digest == in->digest) {
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199 | tmp_buf = out->md_data;
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200 | EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
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201 | } else
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202 | tmp_buf = NULL;
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203 | EVP_MD_CTX_reset(out);
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204 | memcpy(out, in, sizeof(*out));
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205 |
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206 | /* Null these variables, since they are getting fixed up
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207 | * properly below. Anything else may cause a memleak and/or
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208 | * double free if any of the memory allocations below fail
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209 | */
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210 | out->md_data = NULL;
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211 | out->pctx = NULL;
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212 |
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213 | if (in->md_data && out->digest->ctx_size) {
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214 | if (tmp_buf)
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215 | out->md_data = tmp_buf;
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216 | else {
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217 | out->md_data = OPENSSL_malloc(out->digest->ctx_size);
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218 | if (out->md_data == NULL) {
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219 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE);
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220 | return 0;
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221 | }
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222 | }
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223 | memcpy(out->md_data, in->md_data, out->digest->ctx_size);
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224 | }
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225 |
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226 | out->update = in->update;
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227 |
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228 | if (in->pctx) {
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229 | out->pctx = EVP_PKEY_CTX_dup(in->pctx);
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230 | if (!out->pctx) {
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231 | EVP_MD_CTX_reset(out);
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232 | return 0;
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233 | }
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234 | }
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235 |
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236 | if (out->digest->copy)
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237 | return out->digest->copy(out, in);
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238 |
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239 | return 1;
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240 | }
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241 |
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242 | int EVP_Digest(const void *data, size_t count,
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243 | unsigned char *md, unsigned int *size, const EVP_MD *type,
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244 | ENGINE *impl)
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245 | {
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246 | EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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247 | int ret;
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248 |
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249 | if (ctx == NULL)
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250 | return 0;
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251 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT);
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252 | ret = EVP_DigestInit_ex(ctx, type, impl)
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253 | && EVP_DigestUpdate(ctx, data, count)
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254 | && EVP_DigestFinal_ex(ctx, md, size);
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255 | EVP_MD_CTX_free(ctx);
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256 |
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257 | return ret;
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258 | }
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259 |
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260 | int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2)
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261 | {
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262 | if (ctx->digest && ctx->digest->md_ctrl) {
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263 | int ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2);
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264 | if (ret <= 0)
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265 | return 0;
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266 | return 1;
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267 | }
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268 | return 0;
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269 | }
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