226 lines
7.1 KiB
C
226 lines
7.1 KiB
C
/* crypto/rsa/rsa_sign.c */
|
|
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
|
|
* All rights reserved.
|
|
*
|
|
* This package is an SSL implementation written
|
|
* by Eric Young (eay@cryptsoft.com).
|
|
* The implementation was written so as to conform with Netscapes SSL.
|
|
*
|
|
* This library is free for commercial and non-commercial use as long as
|
|
* the following conditions are aheared to. The following conditions
|
|
* apply to all code found in this distribution, be it the RC4, RSA,
|
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
|
|
* included with this distribution is covered by the same copyright terms
|
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
|
|
*
|
|
* Copyright remains Eric Young's, and as such any Copyright notices in
|
|
* the code are not to be removed.
|
|
* If this package is used in a product, Eric Young should be given attribution
|
|
* as the author of the parts of the library used.
|
|
* This can be in the form of a textual message at program startup or
|
|
* in documentation (online or textual) provided with the package.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* "This product includes cryptographic software written by
|
|
* Eric Young (eay@cryptsoft.com)"
|
|
* The word 'cryptographic' can be left out if the rouines from the library
|
|
* being used are not cryptographic related :-).
|
|
* 4. If you include any Windows specific code (or a derivative thereof) from
|
|
* the apps directory (application code) you must include an acknowledgement:
|
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* The licence and distribution terms for any publically available version or
|
|
* derivative of this code cannot be changed. i.e. this code cannot simply be
|
|
* copied and put under another distribution licence
|
|
* [including the GNU Public Licence.]
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include "cryptlib.h"
|
|
#include <openssl/bn.h>
|
|
#include <openssl/rsa.h>
|
|
#include <openssl/objects.h>
|
|
#include <openssl/x509.h>
|
|
#include <openssl/engine.h>
|
|
|
|
/* Size of an SSL signature: MD5+SHA1 */
|
|
#define SSL_SIG_LENGTH 36
|
|
|
|
int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
|
|
unsigned char *sigret, unsigned int *siglen, RSA *rsa)
|
|
{
|
|
X509_SIG sig;
|
|
ASN1_TYPE parameter;
|
|
int i,j,ret=1;
|
|
unsigned char *p, *tmps = NULL;
|
|
const unsigned char *s = NULL;
|
|
X509_ALGOR algor;
|
|
ASN1_OCTET_STRING digest;
|
|
if(rsa->flags & RSA_FLAG_SIGN_VER)
|
|
return ENGINE_get_RSA(rsa->engine)->rsa_sign(type,
|
|
m, m_len, sigret, siglen, rsa);
|
|
/* Special case: SSL signature, just check the length */
|
|
if(type == NID_md5_sha1) {
|
|
if(m_len != SSL_SIG_LENGTH) {
|
|
RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
|
|
return(0);
|
|
}
|
|
i = SSL_SIG_LENGTH;
|
|
s = m;
|
|
} else {
|
|
sig.algor= &algor;
|
|
sig.algor->algorithm=OBJ_nid2obj(type);
|
|
if (sig.algor->algorithm == NULL)
|
|
{
|
|
RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
|
|
return(0);
|
|
}
|
|
if (sig.algor->algorithm->length == 0)
|
|
{
|
|
RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
|
|
return(0);
|
|
}
|
|
parameter.type=V_ASN1_NULL;
|
|
parameter.value.ptr=NULL;
|
|
sig.algor->parameter= ¶meter;
|
|
|
|
sig.digest= &digest;
|
|
sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */
|
|
sig.digest->length=m_len;
|
|
|
|
i=i2d_X509_SIG(&sig,NULL);
|
|
}
|
|
j=RSA_size(rsa);
|
|
if ((i-RSA_PKCS1_PADDING) > j)
|
|
{
|
|
RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
|
|
return(0);
|
|
}
|
|
if(type != NID_md5_sha1) {
|
|
tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
|
|
if (tmps == NULL)
|
|
{
|
|
RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
|
|
return(0);
|
|
}
|
|
p=tmps;
|
|
i2d_X509_SIG(&sig,&p);
|
|
s=tmps;
|
|
}
|
|
i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
|
|
if (i <= 0)
|
|
ret=0;
|
|
else
|
|
*siglen=i;
|
|
|
|
if(type != NID_md5_sha1) {
|
|
memset(tmps,0,(unsigned int)j+1);
|
|
OPENSSL_free(tmps);
|
|
}
|
|
return(ret);
|
|
}
|
|
|
|
int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
|
|
unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
|
|
{
|
|
int i,ret=0,sigtype;
|
|
unsigned char *p,*s;
|
|
X509_SIG *sig=NULL;
|
|
|
|
if (siglen != (unsigned int)RSA_size(rsa))
|
|
{
|
|
RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
|
|
return(0);
|
|
}
|
|
|
|
if(rsa->flags & RSA_FLAG_SIGN_VER)
|
|
return ENGINE_get_RSA(rsa->engine)->rsa_verify(dtype,
|
|
m, m_len, sigbuf, siglen, rsa);
|
|
|
|
s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
|
|
if (s == NULL)
|
|
{
|
|
RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
|
|
RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
|
|
return(0);
|
|
}
|
|
i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
|
|
|
|
if (i <= 0) goto err;
|
|
|
|
/* Special case: SSL signature */
|
|
if(dtype == NID_md5_sha1) {
|
|
if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
|
|
RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
|
|
else ret = 1;
|
|
} else {
|
|
p=s;
|
|
sig=d2i_X509_SIG(NULL,&p,(long)i);
|
|
|
|
if (sig == NULL) goto err;
|
|
sigtype=OBJ_obj2nid(sig->algor->algorithm);
|
|
|
|
|
|
#ifdef RSA_DEBUG
|
|
/* put a backward compatibility flag in EAY */
|
|
fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
|
|
OBJ_nid2ln(dtype));
|
|
#endif
|
|
if (sigtype != dtype)
|
|
{
|
|
if (((dtype == NID_md5) &&
|
|
(sigtype == NID_md5WithRSAEncryption)) ||
|
|
((dtype == NID_md2) &&
|
|
(sigtype == NID_md2WithRSAEncryption)))
|
|
{
|
|
/* ok, we will let it through */
|
|
#if !defined(NO_STDIO) && !defined(WIN16)
|
|
fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
RSAerr(RSA_F_RSA_VERIFY,
|
|
RSA_R_ALGORITHM_MISMATCH);
|
|
goto err;
|
|
}
|
|
}
|
|
if ( ((unsigned int)sig->digest->length != m_len) ||
|
|
(memcmp(m,sig->digest->data,m_len) != 0))
|
|
{
|
|
RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
|
|
}
|
|
else
|
|
ret=1;
|
|
}
|
|
err:
|
|
if (sig != NULL) X509_SIG_free(sig);
|
|
memset(s,0,(unsigned int)siglen);
|
|
OPENSSL_free(s);
|
|
return(ret);
|
|
}
|
|
|