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1/* $OpenBSD: digest.c,v 1.26 2015/02/11 03:19:37 doug Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
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
71 * distribution.
72 *
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/)"
77 *
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.
82 *
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.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
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 * ====================================================================
105 *
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).
109 *
110 */
111
112#include <stdio.h>
113#include <string.h>
114
115#include <openssl/opensslconf.h>
116
117#include <openssl/err.h>
118#include <openssl/evp.h>
119#include <openssl/objects.h>
120
121#ifndef OPENSSL_NO_ENGINE
122#include <openssl/engine.h>
123#endif
124
125void
126EVP_MD_CTX_init(EVP_MD_CTX *ctx)
127{
128 memset(ctx, 0, sizeof *ctx);
129}
130
131EVP_MD_CTX *
132EVP_MD_CTX_create(void)
133{
134 return calloc(1, sizeof(EVP_MD_CTX));
135}
136
137int
138EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
139{
140 EVP_MD_CTX_init(ctx);
141 return EVP_DigestInit_ex(ctx, type, NULL);
142}
143
144int
145EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
146{
147 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
148
149#ifndef OPENSSL_NO_ENGINE
150 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
151 * so this context may already have an ENGINE! Try to avoid releasing
152 * the previous handle, re-querying for an ENGINE, and having a
153 * reinitialisation, when it may all be unecessary. */
154 if (ctx->engine && ctx->digest && (!type ||
155 (type && (type->type == ctx->digest->type))))
156 goto skip_to_init;
157 if (type) {
158 /* Ensure an ENGINE left lying around from last time is cleared
159 * (the previous check attempted to avoid this if the same
160 * ENGINE and EVP_MD could be used). */
161 if (ctx->engine)
162 ENGINE_finish(ctx->engine);
163 if (impl) {
164 if (!ENGINE_init(impl)) {
165 EVPerr(EVP_F_EVP_DIGESTINIT_EX,
166 EVP_R_INITIALIZATION_ERROR);
167 return 0;
168 }
169 } else
170 /* Ask if an ENGINE is reserved for this job */
171 impl = ENGINE_get_digest_engine(type->type);
172 if (impl) {
173 /* There's an ENGINE for this job ... (apparently) */
174 const EVP_MD *d = ENGINE_get_digest(impl, type->type);
175 if (!d) {
176 /* Same comment from evp_enc.c */
177 EVPerr(EVP_F_EVP_DIGESTINIT_EX,
178 EVP_R_INITIALIZATION_ERROR);
179 ENGINE_finish(impl);
180 return 0;
181 }
182 /* We'll use the ENGINE's private digest definition */
183 type = d;
184 /* Store the ENGINE functional reference so we know
185 * 'type' came from an ENGINE and we need to release
186 * it when done. */
187 ctx->engine = impl;
188 } else
189 ctx->engine = NULL;
190 } else if (!ctx->digest) {
191 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET);
192 return 0;
193 }
194#endif
195 if (ctx->digest != type) {
196 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data &&
197 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
198 explicit_bzero(ctx->md_data, ctx->digest->ctx_size);
199 free(ctx->md_data);
200 ctx->md_data = NULL;
201 }
202 ctx->digest = type;
203 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
204 ctx->update = type->update;
205 ctx->md_data = malloc(type->ctx_size);
206 if (ctx->md_data == NULL) {
207 EVP_PKEY_CTX_free(ctx->pctx);
208 ctx->pctx = NULL;
209 EVPerr(EVP_F_EVP_DIGESTINIT_EX,
210 ERR_R_MALLOC_FAILURE);
211 return 0;
212 }
213 }
214 }
215#ifndef OPENSSL_NO_ENGINE
216skip_to_init:
217#endif
218 if (ctx->pctx) {
219 int r;
220 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
221 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
222 if (r <= 0 && (r != -2))
223 return 0;
224 }
225 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
226 return 1;
227 return ctx->digest->init(ctx);
228}
229
230int
231EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
232{
233 return ctx->update(ctx, data, count);
234}
235
236/* The caller can assume that this removes any secret data from the context */
237int
238EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
239{
240 int ret;
241
242 ret = EVP_DigestFinal_ex(ctx, md, size);
243 EVP_MD_CTX_cleanup(ctx);
244 return ret;
245}
246
247/* The caller can assume that this removes any secret data from the context */
248int
249EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
250{
251 int ret;
252
253 if ((size_t)ctx->digest->md_size > EVP_MAX_MD_SIZE) {
254 EVPerr(EVP_F_EVP_DIGESTFINAL_EX, EVP_R_TOO_LARGE);
255 return 0;
256 }
257 ret = ctx->digest->final(ctx, md);
258 if (size != NULL)
259 *size = ctx->digest->md_size;
260 if (ctx->digest->cleanup) {
261 ctx->digest->cleanup(ctx);
262 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
263 }
264 memset(ctx->md_data, 0, ctx->digest->ctx_size);
265 return ret;
266}
267
268int
269EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
270{
271 EVP_MD_CTX_init(out);
272 return EVP_MD_CTX_copy_ex(out, in);
273}
274
275int
276EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
277{
278 unsigned char *tmp_buf;
279
280 if ((in == NULL) || (in->digest == NULL)) {
281 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED);
282 return 0;
283 }
284#ifndef OPENSSL_NO_ENGINE
285 /* Make sure it's safe to copy a digest context using an ENGINE */
286 if (in->engine && !ENGINE_init(in->engine)) {
287 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB);
288 return 0;
289 }
290#endif
291
292 if (out->digest == in->digest) {
293 tmp_buf = out->md_data;
294 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
295 } else
296 tmp_buf = NULL;
297 EVP_MD_CTX_cleanup(out);
298 memcpy(out, in, sizeof *out);
299
300 if (in->md_data && out->digest->ctx_size) {
301 if (tmp_buf)
302 out->md_data = tmp_buf;
303 else {
304 out->md_data = malloc(out->digest->ctx_size);
305 if (!out->md_data) {
306 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,
307 ERR_R_MALLOC_FAILURE);
308 return 0;
309 }
310 }
311 memcpy(out->md_data, in->md_data, out->digest->ctx_size);
312 }
313
314 out->update = in->update;
315
316 if (in->pctx) {
317 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
318 if (!out->pctx) {
319 EVP_MD_CTX_cleanup(out);
320 return 0;
321 }
322 }
323
324 if (out->digest->copy)
325 return out->digest->copy(out, in);
326
327 return 1;
328}
329
330int
331EVP_Digest(const void *data, size_t count,
332 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)
333{
334 EVP_MD_CTX ctx;
335 int ret;
336
337 EVP_MD_CTX_init(&ctx);
338 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT);
339 ret = EVP_DigestInit_ex(&ctx, type, impl) &&
340 EVP_DigestUpdate(&ctx, data, count) &&
341 EVP_DigestFinal_ex(&ctx, md, size);
342 EVP_MD_CTX_cleanup(&ctx);
343
344 return ret;
345}
346
347void
348EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
349{
350 if (ctx) {
351 EVP_MD_CTX_cleanup(ctx);
352 free(ctx);
353 }
354}
355
356/* This call frees resources associated with the context */
357int
358EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
359{
360 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
361 * because sometimes only copies of the context are ever finalised.
362 */
363 if (ctx->digest && ctx->digest->cleanup &&
364 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
365 ctx->digest->cleanup(ctx);
366 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data &&
367 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
368 explicit_bzero(ctx->md_data, ctx->digest->ctx_size);
369 free(ctx->md_data);
370 }
371 EVP_PKEY_CTX_free(ctx->pctx);
372#ifndef OPENSSL_NO_ENGINE
373 if (ctx->engine)
374 /* The EVP_MD we used belongs to an ENGINE, release the
375 * functional reference we held for this reason. */
376 ENGINE_finish(ctx->engine);
377#endif
378 memset(ctx, 0, sizeof *ctx);
379
380 return 1;
381}
382
383int
384EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
385{
386 int ret;
387
388 if (!ctx->digest) {
389 EVPerr(EVP_F_EVP_MD_CTX_CTRL, EVP_R_NO_CIPHER_SET);
390 return 0;
391 }
392
393 if (!ctx->digest->md_ctrl) {
394 EVPerr(EVP_F_EVP_MD_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
395 return 0;
396 }
397
398 ret = ctx->digest->md_ctrl(ctx, type, arg, ptr);
399 if (ret == -1) {
400 EVPerr(EVP_F_EVP_MD_CTX_CTRL,
401 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
402 return 0;
403 }
404 return ret;
405}