Line data Source code
1 : /* crypto/evp/p_verify.c */
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 : #include <stdio.h>
60 : #include "cryptlib.h"
61 : #include <openssl/evp.h>
62 : #include <openssl/objects.h>
63 : #include <openssl/x509.h>
64 :
65 370 : int EVP_VerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sigbuf,
66 : unsigned int siglen, EVP_PKEY *pkey)
67 : {
68 : unsigned char m[EVP_MAX_MD_SIZE];
69 : unsigned int m_len;
70 : int i = 0, ok = 0, v;
71 : EVP_MD_CTX tmp_ctx;
72 : EVP_PKEY_CTX *pkctx = NULL;
73 :
74 370 : EVP_MD_CTX_init(&tmp_ctx);
75 370 : if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
76 : goto err;
77 370 : if (!EVP_DigestFinal_ex(&tmp_ctx, &(m[0]), &m_len))
78 : goto err;
79 370 : EVP_MD_CTX_cleanup(&tmp_ctx);
80 :
81 370 : if (ctx->digest->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) {
82 : i = -1;
83 370 : pkctx = EVP_PKEY_CTX_new(pkey, NULL);
84 370 : if (!pkctx)
85 : goto err;
86 370 : if (EVP_PKEY_verify_init(pkctx) <= 0)
87 : goto err;
88 370 : if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0)
89 : goto err;
90 370 : i = EVP_PKEY_verify(pkctx, sigbuf, siglen, m, m_len);
91 : err:
92 370 : EVP_PKEY_CTX_free(pkctx);
93 370 : return i;
94 : }
95 :
96 0 : for (i = 0; i < 4; i++) {
97 0 : v = ctx->digest->required_pkey_type[i];
98 0 : if (v == 0)
99 : break;
100 0 : if (pkey->type == v) {
101 : ok = 1;
102 : break;
103 : }
104 : }
105 0 : if (!ok) {
106 0 : EVPerr(EVP_F_EVP_VERIFYFINAL, EVP_R_WRONG_PUBLIC_KEY_TYPE);
107 0 : return (-1);
108 : }
109 0 : if (ctx->digest->verify == NULL) {
110 0 : EVPerr(EVP_F_EVP_VERIFYFINAL, EVP_R_NO_VERIFY_FUNCTION_CONFIGURED);
111 0 : return (0);
112 : }
113 :
114 0 : return (ctx->digest->verify(ctx->digest->type, m, m_len,
115 0 : sigbuf, siglen, pkey->pkey.ptr));
116 : }
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