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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/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 
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)67 int 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 
ASN1_item_sign_ctx(const ASN1_ITEM * it,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,void * asn,EVP_MD_CTX * ctx)80 int 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, outll = 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     outll = 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     if (buf_in != NULL) {
126         OPENSSL_cleanse((char *)buf_in, (unsigned int)inl);
127         OPENSSL_free(buf_in);
128     }
129     if (buf_out != NULL) {
130         OPENSSL_cleanse((char *)buf_out, outll);
131         OPENSSL_free(buf_out);
132     }
133     return (outl);
134 }
135