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1 /* crypto/evp/p_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/evp.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64 
65 #ifdef undef
EVP_SignInit(EVP_MD_CTX * ctx,EVP_MD * type)66 void EVP_SignInit(EVP_MD_CTX *ctx, EVP_MD *type)
67 	{
68 	EVP_DigestInit_ex(ctx,type);
69 	}
70 
EVP_SignUpdate(EVP_MD_CTX * ctx,unsigned char * data,unsigned int count)71 void EVP_SignUpdate(EVP_MD_CTX *ctx, unsigned char *data,
72 	     unsigned int count)
73 	{
74 	EVP_DigestUpdate(ctx,data,count);
75 	}
76 #endif
77 
EVP_SignFinal(EVP_MD_CTX * ctx,unsigned char * sigret,unsigned int * siglen,EVP_PKEY * pkey)78 int EVP_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, unsigned int *siglen,
79 	     EVP_PKEY *pkey)
80 	{
81 	unsigned char m[EVP_MAX_MD_SIZE];
82 	unsigned int m_len;
83 	int i,ok=0,v;
84 	MS_STATIC EVP_MD_CTX tmp_ctx;
85 
86 	*siglen=0;
87 	EVP_MD_CTX_init(&tmp_ctx);
88 	EVP_MD_CTX_copy_ex(&tmp_ctx,ctx);
89 	EVP_DigestFinal_ex(&tmp_ctx,&(m[0]),&m_len);
90 	EVP_MD_CTX_cleanup(&tmp_ctx);
91 
92 	if (ctx->digest->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE)
93 		{
94 		EVP_PKEY_CTX *pkctx = NULL;
95 		size_t sltmp = (size_t)EVP_PKEY_size(pkey);
96 		i = 0;
97 		pkctx = EVP_PKEY_CTX_new(pkey, NULL);
98 		if (!pkctx)
99 			goto err;
100 		if (EVP_PKEY_sign_init(pkctx) <= 0)
101 			goto err;
102 		if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0)
103 			goto err;
104 		if (EVP_PKEY_sign(pkctx, sigret, &sltmp, m, m_len) <= 0)
105 			goto err;
106 		*siglen = sltmp;
107 		i = 1;
108 		err:
109 		EVP_PKEY_CTX_free(pkctx);
110 		return i;
111 		}
112 
113 	for (i=0; i<4; i++)
114 		{
115 		v=ctx->digest->required_pkey_type[i];
116 		if (v == 0) break;
117 		if (pkey->type == v)
118 			{
119 			ok=1;
120 			break;
121 			}
122 		}
123 	if (!ok)
124 		{
125 		EVPerr(EVP_F_EVP_SIGNFINAL,EVP_R_WRONG_PUBLIC_KEY_TYPE);
126 		return(0);
127 		}
128 
129 	if (ctx->digest->sign == NULL)
130 		{
131 		EVPerr(EVP_F_EVP_SIGNFINAL,EVP_R_NO_SIGN_FUNCTION_CONFIGURED);
132 		return(0);
133 		}
134 	return(ctx->digest->sign(ctx->digest->type,m,m_len,sigret,siglen,
135 		pkey->pkey.ptr));
136 	}
137 
138