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