rsa_pss.c revision 9dc0df1bac950d6e491f9a7c7e4888f2b301cb15
/* rsa_pss.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
* project 2005.
*/
/* ====================================================================
* Copyright (c) 2005 The OpenSSL Project. All rights reserved.
*
* 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 above 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
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include "cryptlib.h"
static const unsigned char zeroes[] = {0,0,0,0,0,0,0,0};
#endif
{
int i;
int ret = 0;
const unsigned char *H;
unsigned char H_[EVP_MAX_MD_SIZE];
/*
* Negative sLen has special meanings:
* -1 sLen == hLen
* -2 salt length is autorecovered from signature
* -N reserved
*/
else if (sLen < -2)
{
goto err;
}
{
goto err;
}
if (MSBits == 0)
{
EM++;
emLen--;
}
{
goto err;
}
{
goto err;
}
H = EM + maskedDBLen;
if (!DB)
{
goto err;
}
for (i = 0; i < maskedDBLen; i++)
if (MSBits)
if (DB[i++] != 0x1)
{
goto err;
}
{
goto err;
}
if (maskedDBLen - i)
{
ret = 0;
}
else
ret = 1;
err:
if (DB)
return ret;
}
const unsigned char *mHash,
{
int i;
int ret = 0;
/*
* Negative sLen has special meanings:
* -1 sLen == hLen
* -2 salt length is maximized
* -N reserved
*/
else if (sLen < -2)
{
goto err;
}
if (MSBits == 0)
{
*EM++ = 0;
emLen--;
}
if (sLen == -2)
{
}
{
goto err;
}
if (sLen > 0)
{
if (!salt)
{
goto err;
}
goto err;
}
H = EM + maskedDBLen;
if (sLen)
/* Generate dbMask in place then perform XOR on it */
p = EM;
/* Initial PS XORs with all zeroes which is a NOP so just update
* pointer. Note from a test above this value is guaranteed to
* be non-negative.
*/
*p++ ^= 0x1;
if (sLen > 0)
{
for (i = 0; i < sLen; i++)
*p++ ^= salt[i];
}
if (MSBits)
/* H is already in place so just set final 0xbc */
ret = 1;
err:
if (salt)
return ret;
}
#if defined(_MSC_VER)
#endif