1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/digest.h> 58 59 #include <assert.h> 60 #include <string.h> 61 62 #include <openssl/err.h> 63 #include <openssl/obj.h> 64 #include <openssl/mem.h> 65 66 #include "internal.h" 67 68 69 int EVP_MD_type(const EVP_MD *md) { return md->type; } 70 71 uint32_t EVP_MD_flags(const EVP_MD *md) { return md->flags; } 72 73 size_t EVP_MD_size(const EVP_MD *md) { return md->md_size; } 74 75 size_t EVP_MD_block_size(const EVP_MD *md) { return md->block_size; } 76 77 78 void EVP_MD_CTX_init(EVP_MD_CTX *ctx) { memset(ctx, 0, sizeof(EVP_MD_CTX)); } 79 80 EVP_MD_CTX *EVP_MD_CTX_create(void) { 81 EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof(EVP_MD_CTX)); 82 83 if (ctx) { 84 EVP_MD_CTX_init(ctx); 85 } 86 87 return ctx; 88 } 89 90 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) { 91 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data) { 92 OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size); 93 OPENSSL_free(ctx->md_data); 94 } 95 96 assert(ctx->pctx == NULL || ctx->pctx_ops != NULL); 97 if (ctx->pctx_ops) { 98 ctx->pctx_ops->free(ctx->pctx); 99 } 100 101 EVP_MD_CTX_init(ctx); 102 103 return 1; 104 } 105 106 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) { 107 if (!ctx) { 108 return; 109 } 110 111 EVP_MD_CTX_cleanup(ctx); 112 OPENSSL_free(ctx); 113 } 114 115 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) { 116 uint8_t *tmp_buf = NULL; 117 118 if (in == NULL || in->digest == NULL) { 119 OPENSSL_PUT_ERROR(DIGEST, EVP_MD_CTX_copy_ex, 120 DIGEST_R_INPUT_NOT_INITIALIZED); 121 return 0; 122 } 123 124 if (out->digest == in->digest) { 125 /* |md_data| will be the correct size in this case so it's removed from 126 * |out| at this point so that |EVP_MD_CTX_cleanup| doesn't free it and 127 * then it's reused. */ 128 tmp_buf = out->md_data; 129 out->md_data = NULL; 130 } 131 132 EVP_MD_CTX_cleanup(out); 133 memcpy(out, in, sizeof(EVP_MD_CTX)); 134 135 if (in->md_data && in->digest->ctx_size) { 136 if (tmp_buf) { 137 out->md_data = tmp_buf; 138 } else { 139 out->md_data = OPENSSL_malloc(in->digest->ctx_size); 140 if (!out->md_data) { 141 OPENSSL_PUT_ERROR(DIGEST, EVP_MD_CTX_copy_ex, ERR_R_MALLOC_FAILURE); 142 return 0; 143 } 144 } 145 memcpy(out->md_data, in->md_data, in->digest->ctx_size); 146 } 147 148 assert(in->pctx == NULL || in->pctx_ops != NULL); 149 if (in->pctx && in->pctx_ops) { 150 out->pctx = in->pctx_ops->dup(in->pctx); 151 if (!out->pctx) { 152 EVP_MD_CTX_cleanup(out); 153 return 0; 154 } 155 } 156 157 return 1; 158 } 159 160 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) { 161 EVP_MD_CTX_init(out); 162 return EVP_MD_CTX_copy_ex(out, in); 163 } 164 165 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *engine) { 166 if (ctx->digest != type) { 167 if (ctx->digest && ctx->digest->ctx_size) { 168 OPENSSL_free(ctx->md_data); 169 } 170 ctx->digest = type; 171 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { 172 ctx->update = type->update; 173 ctx->md_data = OPENSSL_malloc(type->ctx_size); 174 if (ctx->md_data == NULL) { 175 OPENSSL_PUT_ERROR(DIGEST, EVP_DigestInit_ex, ERR_R_MALLOC_FAILURE); 176 return 0; 177 } 178 } 179 } 180 181 assert(ctx->pctx == NULL || ctx->pctx_ops != NULL); 182 if (ctx->pctx_ops) { 183 if (!ctx->pctx_ops->begin_digest(ctx)) { 184 return 0; 185 } 186 } 187 188 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) { 189 return 1; 190 } 191 192 ctx->digest->init(ctx); 193 return 1; 194 } 195 196 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) { 197 EVP_MD_CTX_init(ctx); 198 return EVP_DigestInit_ex(ctx, type, NULL); 199 } 200 201 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { 202 ctx->update(ctx, data, len); 203 return 1; 204 } 205 206 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, uint8_t *md_out, unsigned int *size) { 207 assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); 208 ctx->digest->final(ctx, md_out); 209 if (size != NULL) { 210 *size = ctx->digest->md_size; 211 } 212 OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size); 213 return 1; 214 } 215 216 int EVP_DigestFinal(EVP_MD_CTX *ctx, uint8_t *md, unsigned int *size) { 217 EVP_DigestFinal_ex(ctx, md, size); 218 EVP_MD_CTX_cleanup(ctx); 219 return 1; 220 } 221 222 int EVP_Digest(const void *data, size_t count, uint8_t *out_md, 223 unsigned int *out_size, const EVP_MD *type, ENGINE *impl) { 224 EVP_MD_CTX ctx; 225 int ret; 226 227 EVP_MD_CTX_init(&ctx); 228 ret = EVP_DigestInit_ex(&ctx, type, impl) && 229 EVP_DigestUpdate(&ctx, data, count) && 230 EVP_DigestFinal_ex(&ctx, out_md, out_size); 231 EVP_MD_CTX_cleanup(&ctx); 232 233 return ret; 234 } 235 236 237 const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx) { 238 if (ctx == NULL) { 239 return NULL; 240 } 241 return ctx->digest; 242 } 243 244 unsigned EVP_MD_CTX_size(const EVP_MD_CTX *ctx) { 245 return EVP_MD_size(EVP_MD_CTX_md(ctx)); 246 } 247 248 unsigned EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx) { 249 return EVP_MD_block_size(EVP_MD_CTX_md(ctx)); 250 } 251 252 int EVP_MD_CTX_type(const EVP_MD_CTX *ctx) { 253 return EVP_MD_type(EVP_MD_CTX_md(ctx)); 254 } 255 256 void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, uint32_t flags) { 257 ctx->flags |= flags; 258 } 259 260 int EVP_add_digest(const EVP_MD *digest) { 261 return 1; 262 } 263
