aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/evp/digest.c
blob: 6fc469f9c452f9b9a7e43e88a8592189a259896d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
/* crypto/evp/digest.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/objects.h>
#include <openssl/evp.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

#ifdef OPENSSL_FIPS
#include <openssl/fips.h>
#endif

void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
	{
	memset(ctx,'\0',sizeof *ctx);
	}

EVP_MD_CTX *EVP_MD_CTX_create(void)
	{
	EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx);

	if (ctx)
		EVP_MD_CTX_init(ctx);

	return ctx;
	}

int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
	{
	EVP_MD_CTX_init(ctx);
	return EVP_DigestInit_ex(ctx, type, NULL);
	}

int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
	{
	EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
#ifndef OPENSSL_NO_ENGINE
	/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
	 * so this context may already have an ENGINE! Try to avoid releasing
	 * the previous handle, re-querying for an ENGINE, and having a
	 * reinitialisation, when it may all be unecessary. */
	if (ctx->engine && ctx->digest && (!type ||
			(type && (type->type == ctx->digest->type))))
		goto skip_to_init;
	if (type)
		{
		/* Ensure an ENGINE left lying around from last time is cleared
		 * (the previous check attempted to avoid this if the same
		 * ENGINE and EVP_MD could be used). */
		if(ctx->engine)
			ENGINE_finish(ctx->engine);
		if(impl)
			{
			if (!ENGINE_init(impl))
				{
				EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
				return 0;
				}
			}
		else
			/* Ask if an ENGINE is reserved for this job */
			impl = ENGINE_get_digest_engine(type->type);
		if(impl)
			{
			/* There's an ENGINE for this job ... (apparently) */
			const EVP_MD *d = ENGINE_get_digest(impl, type->type);
			if(!d)
				{
				/* Same comment from evp_enc.c */
				EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
				ENGINE_finish(impl);
				return 0;
				}
			/* We'll use the ENGINE's private digest definition */
			type = d;
			/* Store the ENGINE functional reference so we know
			 * 'type' came from an ENGINE and we need to release
			 * it when done. */
			ctx->engine = impl;
			}
		else
			ctx->engine = NULL;
		}
	else
	if(!ctx->digest)
		{
		EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET);
		return 0;
		}
#endif
	if (ctx->digest != type)
		{
		if (ctx->digest && ctx->digest->ctx_size)
			OPENSSL_free(ctx->md_data);
		ctx->digest=type;
		if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size)
			{
			ctx->update = type->update;
			ctx->md_data=OPENSSL_malloc(type->ctx_size);
			if (ctx->md_data == NULL)
				{
				EVPerr(EVP_F_EVP_DIGESTINIT_EX,
							ERR_R_MALLOC_FAILURE);
				return 0;
				}
			}
		}
#ifndef OPENSSL_NO_ENGINE
skip_to_init:
#endif
	if (ctx->pctx)
		{
		int r;
		r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
					EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
		if (r <= 0 && (r != -2))
			return 0;
		}
	if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
		return 1;
#ifdef OPENSSL_FIPS
	if (FIPS_mode())
		{
		if (FIPS_digestinit(ctx, type))
			return 1;
		OPENSSL_free(ctx->md_data);
		ctx->md_data = NULL;
		return 0;
		}
#endif
	return ctx->digest->init(ctx);
	}

int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
	{
#ifdef OPENSSL_FIPS
	return FIPS_digestupdate(ctx, data, count);
#else
	return ctx->update(ctx,data,count);
#endif
	}

/* The caller can assume that this removes any secret data from the context */
int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
	{
	int ret;
	ret = EVP_DigestFinal_ex(ctx, md, size);
	EVP_MD_CTX_cleanup(ctx);
	return ret;
	}

/* The caller can assume that this removes any secret data from the context */
int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
	{
#ifdef OPENSSL_FIPS
	return FIPS_digestfinal(ctx, md, size);
#else
	int ret;

	OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
	ret=ctx->digest->final(ctx,md);
	if (size != NULL)
		*size=ctx->digest->md_size;
	if (ctx->digest->cleanup)
		{
		ctx->digest->cleanup(ctx);
		EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
		}
	memset(ctx->md_data,0,ctx->digest->ctx_size);
	return ret;
#endif
	}

int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
	{
	EVP_MD_CTX_init(out);
	return EVP_MD_CTX_copy_ex(out, in);
	}

int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
	{
	unsigned char *tmp_buf;
	if ((in == NULL) || (in->digest == NULL))
		{
		EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED);
		return 0;
		}
#ifndef OPENSSL_NO_ENGINE
	/* Make sure it's safe to copy a digest context using an ENGINE */
	if (in->engine && !ENGINE_init(in->engine))
		{
		EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB);
		return 0;
		}
#endif

	if (out->digest == in->digest)
		{
		tmp_buf = out->md_data;
	    	EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);
		}
	else tmp_buf = NULL;
	EVP_MD_CTX_cleanup(out);
	memcpy(out,in,sizeof *out);

	if (in->md_data && out->digest->ctx_size)
		{
		if (tmp_buf)
			out->md_data = tmp_buf;
		else
			{
			out->md_data=OPENSSL_malloc(out->digest->ctx_size);
			if (!out->md_data)
				{
				EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE);
				return 0;
				}
			}
		memcpy(out->md_data,in->md_data,out->digest->ctx_size);
		}

	out->update = in->update;

	if (in->pctx)
		{
		out->pctx = EVP_PKEY_CTX_dup(in->pctx);
		if (!out->pctx)
			{
			EVP_MD_CTX_cleanup(out);
			return 0;
			}
		}

	if (out->digest->copy)
		return out->digest->copy(out,in);
	
	return 1;
	}

int EVP_Digest(const void *data, size_t count,
		unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)
	{
	EVP_MD_CTX ctx;
	int ret;

	EVP_MD_CTX_init(&ctx);
	EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT);
	ret=EVP_DigestInit_ex(&ctx, type, impl)
	  && EVP_DigestUpdate(&ctx, data, count)
	  && EVP_DigestFinal_ex(&ctx, md, size);
	EVP_MD_CTX_cleanup(&ctx);

	return ret;
	}

void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
	{
	EVP_MD_CTX_cleanup(ctx);
	OPENSSL_free(ctx);
	}

/* This call frees resources associated with the context */
int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
	{
#ifndef OPENSSL_FIPS
	/* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
	 * because sometimes only copies of the context are ever finalised.
	 */
	if (ctx->digest && ctx->digest->cleanup
	    && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED))
		ctx->digest->cleanup(ctx);
	if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
	    && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE))
		{
		OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
		OPENSSL_free(ctx->md_data);
		}
#endif
	if (ctx->pctx)
		EVP_PKEY_CTX_free(ctx->pctx);
#ifndef OPENSSL_NO_ENGINE
	if(ctx->engine)
		/* The EVP_MD we used belongs to an ENGINE, release the
		 * functional reference we held for this reason. */
		ENGINE_finish(ctx->engine);
#endif
#ifdef OPENSSL_FIPS
	FIPS_md_ctx_cleanup(ctx);
#endif
	memset(ctx,'\0',sizeof *ctx);

	return 1;
	}