Initial Commit
This commit is contained in:
root
301
openssl-1.0.2f/crypto/rsa/rsa_sign.c
Normal file
301
openssl-1.0.2f/crypto/rsa/rsa_sign.c
Normal file
@@ -0,0 +1,301 @@
|
||||
/* 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 "rsa_locl.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;
|
||||
#ifdef OPENSSL_FIPS
|
||||
if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
|
||||
&& !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
|
||||
RSAerr(RSA_F_RSA_SIGN, RSA_R_NON_FIPS_RSA_METHOD);
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
if (rsa->meth->rsa_sign) {
|
||||
return rsa->meth->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 > (j - RSA_PKCS1_PADDING_SIZE)) {
|
||||
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) {
|
||||
OPENSSL_cleanse(tmps, (unsigned int)j + 1);
|
||||
OPENSSL_free(tmps);
|
||||
}
|
||||
return (ret);
|
||||
}
|
||||
|
||||
/*
|
||||
* Check DigestInfo structure does not contain extraneous data by reencoding
|
||||
* using DER and checking encoding against original.
|
||||
*/
|
||||
static int rsa_check_digestinfo(X509_SIG *sig, const unsigned char *dinfo,
|
||||
int dinfolen)
|
||||
{
|
||||
unsigned char *der = NULL;
|
||||
int derlen;
|
||||
int ret = 0;
|
||||
derlen = i2d_X509_SIG(sig, &der);
|
||||
if (derlen <= 0)
|
||||
return 0;
|
||||
if (derlen == dinfolen && !memcmp(dinfo, der, derlen))
|
||||
ret = 1;
|
||||
OPENSSL_cleanse(der, derlen);
|
||||
OPENSSL_free(der);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int int_rsa_verify(int dtype, const unsigned char *m,
|
||||
unsigned int m_len,
|
||||
unsigned char *rm, size_t *prm_len,
|
||||
const unsigned char *sigbuf, size_t siglen, RSA *rsa)
|
||||
{
|
||||
int i, ret = 0, sigtype;
|
||||
unsigned char *s;
|
||||
X509_SIG *sig = NULL;
|
||||
|
||||
#ifdef OPENSSL_FIPS
|
||||
if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
|
||||
&& !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_NON_FIPS_RSA_METHOD);
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
if (siglen != (unsigned int)RSA_size(rsa)) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_WRONG_SIGNATURE_LENGTH);
|
||||
return (0);
|
||||
}
|
||||
|
||||
if ((dtype == NID_md5_sha1) && rm) {
|
||||
i = RSA_public_decrypt((int)siglen,
|
||||
sigbuf, rm, rsa, RSA_PKCS1_PADDING);
|
||||
if (i <= 0)
|
||||
return 0;
|
||||
*prm_len = i;
|
||||
return 1;
|
||||
}
|
||||
|
||||
s = (unsigned char *)OPENSSL_malloc((unsigned int)siglen);
|
||||
if (s == NULL) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, ERR_R_MALLOC_FAILURE);
|
||||
goto err;
|
||||
}
|
||||
if ((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH)) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_MESSAGE_LENGTH);
|
||||
goto err;
|
||||
}
|
||||
i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
|
||||
|
||||
if (i <= 0)
|
||||
goto err;
|
||||
/*
|
||||
* Oddball MDC2 case: signature can be OCTET STRING. check for correct
|
||||
* tag and length octets.
|
||||
*/
|
||||
if (dtype == NID_mdc2 && i == 18 && s[0] == 0x04 && s[1] == 0x10) {
|
||||
if (rm) {
|
||||
memcpy(rm, s + 2, 16);
|
||||
*prm_len = 16;
|
||||
ret = 1;
|
||||
} else if (memcmp(m, s + 2, 16)) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
|
||||
} else {
|
||||
ret = 1;
|
||||
}
|
||||
} else if (dtype == NID_md5_sha1) {
|
||||
/* Special case: SSL signature */
|
||||
if ((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
|
||||
else
|
||||
ret = 1;
|
||||
} else {
|
||||
const unsigned char *p = s;
|
||||
sig = d2i_X509_SIG(NULL, &p, (long)i);
|
||||
|
||||
if (sig == NULL)
|
||||
goto err;
|
||||
|
||||
/* Excess data can be used to create forgeries */
|
||||
if (p != s + i || !rsa_check_digestinfo(sig, s, i)) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
|
||||
goto err;
|
||||
}
|
||||
|
||||
/*
|
||||
* Parameters to the signature algorithm can also be used to create
|
||||
* forgeries
|
||||
*/
|
||||
if (sig->algor->parameter
|
||||
&& ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
|
||||
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) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_ALGORITHM_MISMATCH);
|
||||
goto err;
|
||||
}
|
||||
if (rm) {
|
||||
const EVP_MD *md;
|
||||
md = EVP_get_digestbynid(dtype);
|
||||
if (md && (EVP_MD_size(md) != sig->digest->length))
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
|
||||
else {
|
||||
memcpy(rm, sig->digest->data, sig->digest->length);
|
||||
*prm_len = sig->digest->length;
|
||||
ret = 1;
|
||||
}
|
||||
} else if (((unsigned int)sig->digest->length != m_len) ||
|
||||
(memcmp(m, sig->digest->data, m_len) != 0)) {
|
||||
RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
|
||||
} else
|
||||
ret = 1;
|
||||
}
|
||||
err:
|
||||
if (sig != NULL)
|
||||
X509_SIG_free(sig);
|
||||
if (s != NULL) {
|
||||
OPENSSL_cleanse(s, (unsigned int)siglen);
|
||||
OPENSSL_free(s);
|
||||
}
|
||||
return (ret);
|
||||
}
|
||||
|
||||
int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
|
||||
const unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
|
||||
{
|
||||
|
||||
if (rsa->meth->rsa_verify) {
|
||||
return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa);
|
||||
}
|
||||
|
||||
return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
|
||||
}
|
||||
Reference in New Issue
Block a user