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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 
x509_digest_sign_algorithm(EVP_MD_CTX * ctx,X509_ALGOR * algor)68 int 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 
x509_digest_verify_init(EVP_MD_CTX * ctx,X509_ALGOR * sigalg,EVP_PKEY * pkey)113 int 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