1/* m_sigver.c */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2006.
4 */
5/* ====================================================================
6 * Copyright (c) 2006,2007 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/evp.h>
62#include <openssl/objects.h>
63#include <openssl/x509.h>
64#include "evp_locl.h"
65
66static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
67			  const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
68			  int ver)
69	{
70	if (ctx->pctx == NULL)
71		ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
72	if (ctx->pctx == NULL)
73		return 0;
74
75	if (type == NULL)
76		{
77		int def_nid;
78		if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
79			type = EVP_get_digestbynid(def_nid);
80		}
81
82	if (type == NULL)
83		{
84		EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
85		return 0;
86		}
87
88	if (ver)
89		{
90		if (ctx->pctx->pmeth->verifyctx_init)
91			{
92			if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <=0)
93				return 0;
94			ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
95			}
96		else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
97			return 0;
98		}
99	else
100		{
101		if (ctx->pctx->pmeth->signctx_init)
102			{
103			if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
104				return 0;
105			ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
106			}
107		else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
108			return 0;
109		}
110	if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
111		return 0;
112	if (pctx)
113		*pctx = ctx->pctx;
114	if (!EVP_DigestInit_ex(ctx, type, e))
115		return 0;
116	return 1;
117	}
118
119int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
120			const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
121	{
122	return do_sigver_init(ctx, pctx, type, e, pkey, 0);
123	}
124
125int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
126			const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
127	{
128	return do_sigver_init(ctx, pctx, type, e, pkey, 1);
129	}
130
131int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen)
132	{
133	int sctx, r = 0;
134	if (ctx->pctx->pmeth->signctx)
135		sctx = 1;
136	else
137		sctx = 0;
138	if (sigret)
139		{
140		EVP_MD_CTX tmp_ctx;
141		unsigned char md[EVP_MAX_MD_SIZE];
142		unsigned int mdlen;
143		EVP_MD_CTX_init(&tmp_ctx);
144		if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx))
145		     	return 0;
146		if (sctx)
147			r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx,
148					sigret, siglen, &tmp_ctx);
149		else
150			r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen);
151		EVP_MD_CTX_cleanup(&tmp_ctx);
152		if (sctx || !r)
153			return r;
154		if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
155			return 0;
156		}
157	else
158		{
159		if (sctx)
160			{
161			if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx) <= 0)
162				return 0;
163			}
164		else
165			{
166			int s = EVP_MD_size(ctx->digest);
167			if (s < 0 || EVP_PKEY_sign(ctx->pctx, sigret, siglen, NULL, s) <= 0)
168				return 0;
169			}
170		}
171	return 1;
172	}
173
174int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, unsigned char *sig, size_t siglen)
175	{
176	EVP_MD_CTX tmp_ctx;
177	unsigned char md[EVP_MAX_MD_SIZE];
178	int r;
179	unsigned int mdlen;
180	int vctx;
181
182	if (ctx->pctx->pmeth->verifyctx)
183		vctx = 1;
184	else
185		vctx = 0;
186	EVP_MD_CTX_init(&tmp_ctx);
187	if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx))
188		return -1;
189	if (vctx)
190		{
191		r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx,
192					sig, siglen, &tmp_ctx);
193		}
194	else
195		r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen);
196	EVP_MD_CTX_cleanup(&tmp_ctx);
197	if (vctx || !r)
198		return r;
199	return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
200	}
201