1 /* Copyright (C) 1995-1998 Eric Young ([email protected])
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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/asn1.h>
58 #include <openssl/digest.h>
59 #include <openssl/err.h>
60 #include <openssl/evp.h>
61 #include <openssl/mem.h>
62 #include <openssl/obj.h>
63 #include <openssl/x509.h>
64
65 #include <limits.h>
66
67 #include "internal.h"
68
ASN1_item_sign(const ASN1_ITEM * it,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,void * asn,EVP_PKEY * pkey,const EVP_MD * type)69 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
70 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey,
71 const EVP_MD *type) {
72 if (signature->type != V_ASN1_BIT_STRING) {
73 OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_TYPE);
74 return 0;
75 }
76 EVP_MD_CTX ctx;
77 EVP_MD_CTX_init(&ctx);
78 if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) {
79 EVP_MD_CTX_cleanup(&ctx);
80 return 0;
81 }
82 return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);
83 }
84
ASN1_item_sign_ctx(const ASN1_ITEM * it,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,void * asn,EVP_MD_CTX * ctx)85 int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
86 X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
87 void *asn, EVP_MD_CTX *ctx) {
88 int ret = 0;
89 uint8_t *in = NULL, *out = NULL;
90 if (signature->type != V_ASN1_BIT_STRING) {
91 OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_TYPE);
92 goto err;
93 }
94
95 // Write out the requested copies of the AlgorithmIdentifier.
96 if (algor1 && !x509_digest_sign_algorithm(ctx, algor1)) {
97 goto err;
98 }
99 if (algor2 && !x509_digest_sign_algorithm(ctx, algor2)) {
100 goto err;
101 }
102
103 int in_len = ASN1_item_i2d(asn, &in, it);
104 if (in_len < 0) {
105 goto err;
106 }
107
108 EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
109 size_t out_len = EVP_PKEY_size(pkey);
110 if (out_len > INT_MAX) {
111 OPENSSL_PUT_ERROR(X509, ERR_R_OVERFLOW);
112 goto err;
113 }
114
115 out = OPENSSL_malloc(out_len);
116 if (out == NULL) {
117 goto err;
118 }
119
120 if (!EVP_DigestSign(ctx, out, &out_len, in, in_len)) {
121 OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB);
122 goto err;
123 }
124
125 ASN1_STRING_set0(signature, out, (int)out_len);
126 out = NULL;
127 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
128 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
129 ret = (int)out_len;
130
131 err:
132 EVP_MD_CTX_cleanup(ctx);
133 OPENSSL_free(in);
134 OPENSSL_free(out);
135 return ret;
136 }
137