1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/evp.h>
58
59#include <assert.h>
60
61#include <openssl/asn1.h>
62#include <openssl/err.h>
63#include <openssl/obj.h>
64#include <openssl/x509.h>
65
66#include "internal.h"
67
68
69int EVP_DigestSignAlgorithm(EVP_MD_CTX *ctx, X509_ALGOR *algor) {
70  const EVP_MD *digest;
71  EVP_PKEY *pkey;
72  int sign_nid, paramtype;
73
74  digest = EVP_MD_CTX_md(ctx);
75  pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
76  if (!digest || !pkey) {
77    OPENSSL_PUT_ERROR(EVP, EVP_DigestSignAlgorithm,
78                      EVP_R_CONTEXT_NOT_INITIALISED);
79    return 0;
80  }
81
82  if (pkey->ameth->digest_sign_algorithm) {
83    switch (pkey->ameth->digest_sign_algorithm(ctx, algor)) {
84      case EVP_DIGEST_SIGN_ALGORITHM_ERROR:
85        return 0;
86      case EVP_DIGEST_SIGN_ALGORITHM_SUCCESS:
87        return 1;
88      case EVP_DIGEST_SIGN_ALGORITHM_DEFAULT:
89        /* Use default behavior. */
90        break;
91      default:
92        assert(0);
93    }
94  }
95
96  /* Default behavior: look up the OID for the algorithm/hash pair and encode
97   * that. */
98  if (!OBJ_find_sigid_by_algs(&sign_nid, EVP_MD_type(digest),
99                              pkey->ameth->pkey_id)) {
100    OPENSSL_PUT_ERROR(EVP, EVP_DigestSignAlgorithm,
101                      EVP_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
102    return 0;
103  }
104
105  if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL) {
106    paramtype = V_ASN1_NULL;
107  } else {
108    paramtype = V_ASN1_UNDEF;
109  }
110
111  X509_ALGOR_set0(algor, OBJ_nid2obj(sign_nid), paramtype, NULL);
112  return 1;
113}
114
115int EVP_DigestVerifyInitFromAlgorithm(EVP_MD_CTX *ctx,
116                                      X509_ALGOR *algor,
117                                      EVP_PKEY *pkey) {
118  int digest_nid, pkey_nid;
119  const EVP_PKEY_ASN1_METHOD *ameth;
120  const EVP_MD *digest;
121
122  /* Convert signature OID into digest and public key OIDs */
123  if (!OBJ_find_sigid_algs(OBJ_obj2nid(algor->algorithm), &digest_nid,
124                           &pkey_nid)) {
125    OPENSSL_PUT_ERROR(EVP, EVP_DigestVerifyInitFromAlgorithm,
126                      EVP_R_UNKNOWN_SIGNATURE_ALGORITHM);
127    return 0;
128  }
129
130  /* Check public key OID matches public key type */
131  ameth = EVP_PKEY_asn1_find(NULL, pkey_nid);
132  if (ameth == NULL || ameth->pkey_id != pkey->ameth->pkey_id) {
133    OPENSSL_PUT_ERROR(EVP, EVP_DigestVerifyInitFromAlgorithm,
134                      EVP_R_WRONG_PUBLIC_KEY_TYPE);
135    return 0;
136  }
137
138  /* NID_undef signals that there are custom parameters to set. */
139  if (digest_nid == NID_undef) {
140    if (!pkey->ameth || !pkey->ameth->digest_verify_init_from_algorithm) {
141      OPENSSL_PUT_ERROR(EVP, EVP_DigestVerifyInitFromAlgorithm,
142                        EVP_R_UNKNOWN_SIGNATURE_ALGORITHM);
143      return 0;
144    }
145
146    return pkey->ameth->digest_verify_init_from_algorithm(ctx, algor, pkey);
147  }
148
149  /* Otherwise, initialize with the digest from the OID. */
150  digest = EVP_get_digestbynid(digest_nid);
151  if (digest == NULL) {
152    OPENSSL_PUT_ERROR(EVP, EVP_DigestVerifyInitFromAlgorithm,
153                      EVP_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
154    return 0;
155  }
156
157  return EVP_DigestVerifyInit(ctx, NULL, digest, NULL, pkey);
158}
159
160