1 /* crypto/evp/digest.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
113 #include "cryptlib.h"
114 #include <openssl/objects.h>
115 #include <openssl/evp.h>
116 #ifndef OPENSSL_NO_ENGINE
117 #include <openssl/engine.h>
121 #include <openssl/fips.h>
122 #include "evp_locl.h"
125 void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
127 memset(ctx,'\0',sizeof *ctx);
130 EVP_MD_CTX *EVP_MD_CTX_create(void)
132 EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
135 EVP_MD_CTX_init(ctx);
140 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
142 EVP_MD_CTX_init(ctx);
143 return EVP_DigestInit_ex(ctx, type, NULL);
146 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
148 EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
150 /* If FIPS mode switch to approved implementation if possible */
153 const EVP_MD *fipsmd;
156 fipsmd = evp_get_fips_md(type);
162 #ifndef OPENSSL_NO_ENGINE
163 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
164 * so this context may already have an ENGINE! Try to avoid releasing
165 * the previous handle, re-querying for an ENGINE, and having a
166 * reinitialisation, when it may all be unecessary. */
167 if (ctx->engine && ctx->digest && (!type ||
168 (type && (type->type == ctx->digest->type))))
172 /* Ensure an ENGINE left lying around from last time is cleared
173 * (the previous check attempted to avoid this if the same
174 * ENGINE and EVP_MD could be used). */
176 ENGINE_finish(ctx->engine);
179 if (!ENGINE_init(impl))
181 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
186 /* Ask if an ENGINE is reserved for this job */
187 impl = ENGINE_get_digest_engine(type->type);
190 /* There's an ENGINE for this job ... (apparently) */
191 const EVP_MD *d = ENGINE_get_digest(impl, type->type);
194 /* Same comment from evp_enc.c */
195 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
199 /* We'll use the ENGINE's private digest definition */
201 /* Store the ENGINE functional reference so we know
202 * 'type' came from an ENGINE and we need to release
212 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET);
216 if (ctx->digest != type)
218 if (ctx->digest && ctx->digest->ctx_size)
219 OPENSSL_free(ctx->md_data);
221 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size)
223 ctx->update = type->update;
224 ctx->md_data=OPENSSL_malloc(type->ctx_size);
225 if (ctx->md_data == NULL)
227 EVPerr(EVP_F_EVP_DIGESTINIT_EX,
228 ERR_R_MALLOC_FAILURE);
233 #ifndef OPENSSL_NO_ENGINE
239 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
240 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
241 if (r <= 0 && (r != -2))
244 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
249 if (FIPS_digestinit(ctx, type))
251 OPENSSL_free(ctx->md_data);
256 return ctx->digest->init(ctx);
259 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
262 return FIPS_digestupdate(ctx, data, count);
264 return ctx->update(ctx,data,count);
268 /* The caller can assume that this removes any secret data from the context */
269 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
272 ret = EVP_DigestFinal_ex(ctx, md, size);
273 EVP_MD_CTX_cleanup(ctx);
277 /* The caller can assume that this removes any secret data from the context */
278 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
281 return FIPS_digestfinal(ctx, md, size);
285 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
286 ret=ctx->digest->final(ctx,md);
288 *size=ctx->digest->md_size;
289 if (ctx->digest->cleanup)
291 ctx->digest->cleanup(ctx);
292 EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
294 memset(ctx->md_data,0,ctx->digest->ctx_size);
299 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
301 EVP_MD_CTX_init(out);
302 return EVP_MD_CTX_copy_ex(out, in);
305 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
307 unsigned char *tmp_buf;
308 if ((in == NULL) || (in->digest == NULL))
310 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED);
313 #ifndef OPENSSL_NO_ENGINE
314 /* Make sure it's safe to copy a digest context using an ENGINE */
315 if (in->engine && !ENGINE_init(in->engine))
317 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB);
322 if (out->digest == in->digest)
324 tmp_buf = out->md_data;
325 EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);
328 EVP_MD_CTX_cleanup(out);
329 memcpy(out,in,sizeof *out);
331 if (in->md_data && out->digest->ctx_size)
334 out->md_data = tmp_buf;
337 out->md_data=OPENSSL_malloc(out->digest->ctx_size);
340 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE);
344 memcpy(out->md_data,in->md_data,out->digest->ctx_size);
347 out->update = in->update;
351 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
354 EVP_MD_CTX_cleanup(out);
359 if (out->digest->copy)
360 return out->digest->copy(out,in);
365 int EVP_Digest(const void *data, size_t count,
366 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)
371 EVP_MD_CTX_init(&ctx);
372 EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT);
373 ret=EVP_DigestInit_ex(&ctx, type, impl)
374 && EVP_DigestUpdate(&ctx, data, count)
375 && EVP_DigestFinal_ex(&ctx, md, size);
376 EVP_MD_CTX_cleanup(&ctx);
381 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
385 EVP_MD_CTX_cleanup(ctx);
390 /* This call frees resources associated with the context */
391 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
394 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
395 * because sometimes only copies of the context are ever finalised.
397 if (ctx->digest && ctx->digest->cleanup
398 && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED))
399 ctx->digest->cleanup(ctx);
400 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
401 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE))
403 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
404 OPENSSL_free(ctx->md_data);
408 EVP_PKEY_CTX_free(ctx->pctx);
409 #ifndef OPENSSL_NO_ENGINE
411 /* The EVP_MD we used belongs to an ENGINE, release the
412 * functional reference we held for this reason. */
413 ENGINE_finish(ctx->engine);
416 FIPS_md_ctx_cleanup(ctx);
418 memset(ctx,'\0',sizeof *ctx);