1 /* crypto/pem/pem_sign.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  *
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  *
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  *
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  *
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  *
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/rand.h>
62 #include <openssl/evp.h>
63 #include <openssl/objects.h>
64 #include <openssl/x509.h>
65 #include <openssl/pem.h>
66 
PEM_SignInit(EVP_MD_CTX * ctx,EVP_MD * type)67 void PEM_SignInit(EVP_MD_CTX *ctx, EVP_MD *type)
68 {
69     EVP_DigestInit_ex(ctx, type, NULL);
70 }
71 
PEM_SignUpdate(EVP_MD_CTX * ctx,unsigned char * data,unsigned int count)72 void PEM_SignUpdate(EVP_MD_CTX *ctx, unsigned char *data, unsigned int count)
73 {
74     EVP_DigestUpdate(ctx, data, count);
75 }
76 
PEM_SignFinal(EVP_MD_CTX * ctx,unsigned char * sigret,unsigned int * siglen,EVP_PKEY * pkey)77 int PEM_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
78                   unsigned int *siglen, EVP_PKEY *pkey)
79 {
80     unsigned char *m;
81     int i, ret = 0;
82     unsigned int m_len;
83 
84     m = (unsigned char *)OPENSSL_malloc(EVP_PKEY_size(pkey) + 2);
85     if (m == NULL) {
86         PEMerr(PEM_F_PEM_SIGNFINAL, ERR_R_MALLOC_FAILURE);
87         goto err;
88     }
89 
90     if (EVP_SignFinal(ctx, m, &m_len, pkey) <= 0)
91         goto err;
92 
93     i = EVP_EncodeBlock(sigret, m, m_len);
94     *siglen = i;
95     ret = 1;
96  err:
97     /* ctx has been zeroed by EVP_SignFinal() */
98     if (m != NULL)
99         OPENSSL_free(m);
100     return (ret);
101 }
102