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/x509.h>
58
59#include <openssl/asn1.h>
60#include <openssl/digest.h>
61#include <openssl/err.h>
62#include <openssl/evp.h>
63#include <openssl/obj.h>
64
65#include "internal.h"
66
67
68int x509_digest_sign_algorithm(EVP_MD_CTX *ctx, X509_ALGOR *algor) {
69 EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
70 if (pkey == NULL) {
71 OPENSSL_PUT_ERROR(ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
72 return 0;
73 }
74
75 if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) {
76 int pad_mode;
77 if (!EVP_PKEY_CTX_get_rsa_padding(ctx->pctx, &pad_mode)) {
78 return 0;
79 }
80 /* RSA-PSS has special signature algorithm logic. */
81 if (pad_mode == RSA_PKCS1_PSS_PADDING) {
82 return x509_rsa_ctx_to_pss(ctx, algor);
83 }
84 }
85
86 if (EVP_PKEY_id(pkey) == EVP_PKEY_ED25519) {
87 return X509_ALGOR_set0(algor, OBJ_nid2obj(NID_ED25519), V_ASN1_UNDEF, NULL);
88 }
89
90 /* Default behavior: look up the OID for the algorithm/hash pair and encode
91 * that. */
92 const EVP_MD *digest = EVP_MD_CTX_md(ctx);
93 if (digest == NULL) {
94 OPENSSL_PUT_ERROR(ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
95 return 0;
96 }
97
98 int sign_nid;
99 if (!OBJ_find_sigid_by_algs(&sign_nid, EVP_MD_type(digest),
100 EVP_PKEY_id(pkey))) {
101 OPENSSL_PUT_ERROR(ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
102 return 0;
103 }
104
105 /* RSA signature algorithms include an explicit NULL parameter. Others omit
106 * it. */
107 int paramtype =
108 (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) ? V_ASN1_NULL : V_ASN1_UNDEF;
109 X509_ALGOR_set0(algor, OBJ_nid2obj(sign_nid), paramtype, NULL);
110 return 1;
111}
112
113int x509_digest_verify_init(EVP_MD_CTX *ctx, X509_ALGOR *sigalg,
114 EVP_PKEY *pkey) {
115 /* Convert the signature OID into digest and public key OIDs. */
116 int sigalg_nid = OBJ_obj2nid(sigalg->algorithm);
117 int digest_nid, pkey_nid;
118 if (!OBJ_find_sigid_algs(sigalg_nid, &digest_nid, &pkey_nid)) {
119 OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
120 return 0;
121 }
122
123 /* Check the public key OID matches the public key type. */
124 if (pkey_nid != EVP_PKEY_id(pkey)) {
125 OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
126 return 0;
127 }
128
129 /* NID_undef signals that there are custom parameters to set. */
130 if (digest_nid == NID_undef) {
131 if (sigalg_nid == NID_rsassaPss) {
132 return x509_rsa_pss_to_ctx(ctx, sigalg, pkey);
133 }
134 if (sigalg_nid == NID_ED25519) {
135 if (sigalg->parameter != NULL) {
136 OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PARAMETER);
137 return 0;
138 }
139 return EVP_DigestVerifyInit(ctx, NULL, NULL, NULL, pkey);
140 }
141 OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
142 return 0;
143 }
144
145 /* Otherwise, initialize with the digest from the OID. */
146 const EVP_MD *digest = EVP_get_digestbynid(digest_nid);
147 if (digest == NULL) {
148 OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
149 return 0;
150 }
151
152 return EVP_DigestVerifyInit(ctx, NULL, digest, NULL, pkey);
153}
154