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/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 "internal.h"
66
67int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
68 X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
69 EVP_PKEY *pkey, const EVP_MD *type)
70{
71 EVP_MD_CTX ctx;
72 EVP_MD_CTX_init(&ctx);
73 if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) {
74 EVP_MD_CTX_cleanup(&ctx);
75 return 0;
76 }
77 return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);
78}
79
80int ASN1_item_sign_ctx(const ASN1_ITEM *it,
81 X509_ALGOR *algor1, X509_ALGOR *algor2,
82 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
83{
84 EVP_PKEY *pkey;
85 unsigned char *buf_in = NULL, *buf_out = NULL;
86 size_t inl = 0, outl = 0;
87
88 pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
89
90 /* Write out the requested copies of the AlgorithmIdentifier. */
91 if (algor1 && !x509_digest_sign_algorithm(ctx, algor1)) {
92 goto err;
93 }
94 if (algor2 && !x509_digest_sign_algorithm(ctx, algor2)) {
95 goto err;
96 }
97
98 inl = ASN1_item_i2d(asn, &buf_in, it);
99 outl = EVP_PKEY_size(pkey);
100 buf_out = OPENSSL_malloc((unsigned int)outl);
101 if ((buf_in == NULL) || (buf_out == NULL)) {
102 outl = 0;
103 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
104 goto err;
105 }
106
107 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
108 outl = 0;
109 OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB);
110 goto err;
111 }
112 if (signature->data != NULL)
113 OPENSSL_free(signature->data);
114 signature->data = buf_out;
115 buf_out = NULL;
116 signature->length = outl;
117 /*
118 * In the interests of compatibility, I'll make sure that the bit string
119 * has a 'not-used bits' value of 0
120 */
121 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
122 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
123 err:
124 EVP_MD_CTX_cleanup(ctx);
125 OPENSSL_free(buf_in);
126 OPENSSL_free(buf_out);
127 return (outl);
128}
129