225 lines
6.2 KiB
C
225 lines
6.2 KiB
C
/* crypto/rsa/rsa_pk1.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/rand.h>
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int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
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const unsigned char *from, int flen)
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{
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int j;
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unsigned char *p;
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if (flen > (tlen-RSA_PKCS1_PADDING_SIZE))
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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return(0);
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}
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p=(unsigned char *)to;
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*(p++)=0;
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*(p++)=1; /* Private Key BT (Block Type) */
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/* pad out with 0xff data */
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j=tlen-3-flen;
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memset(p,0xff,j);
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p+=j;
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*(p++)='\0';
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memcpy(p,from,(unsigned int)flen);
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return(1);
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}
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int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
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const unsigned char *from, int flen, int num)
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{
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int i,j;
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const unsigned char *p;
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p=from;
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if ((num != (flen+1)) || (*(p++) != 01))
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BLOCK_TYPE_IS_NOT_01);
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return(-1);
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}
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/* scan over padding data */
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j=flen-1; /* one for type. */
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for (i=0; i<j; i++)
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{
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if (*p != 0xff) /* should decrypt to 0xff */
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{
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if (*p == 0)
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{ p++; break; }
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else {
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_FIXED_HEADER_DECRYPT);
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return(-1);
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}
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}
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p++;
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}
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if (i == j)
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_NULL_BEFORE_BLOCK_MISSING);
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return(-1);
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}
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if (i < 8)
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_PAD_BYTE_COUNT);
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return(-1);
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}
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i++; /* Skip over the '\0' */
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j-=i;
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if (j > tlen)
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE);
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return(-1);
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}
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memcpy(to,p,(unsigned int)j);
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return(j);
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}
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int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
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const unsigned char *from, int flen)
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{
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int i,j;
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unsigned char *p;
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if (flen > (tlen-11))
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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return(0);
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}
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p=(unsigned char *)to;
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*(p++)=0;
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*(p++)=2; /* Public Key BT (Block Type) */
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/* pad out with non-zero random data */
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j=tlen-3-flen;
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if (RAND_bytes(p,j) <= 0)
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return(0);
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for (i=0; i<j; i++)
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{
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if (*p == '\0')
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do {
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if (RAND_bytes(p,1) <= 0)
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return(0);
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} while (*p == '\0');
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p++;
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}
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*(p++)='\0';
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memcpy(p,from,(unsigned int)flen);
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return(1);
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}
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int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
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const unsigned char *from, int flen, int num)
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{
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int i,j;
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const unsigned char *p;
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p=from;
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if ((num != (flen+1)) || (*(p++) != 02))
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02);
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return(-1);
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}
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#ifdef PKCS1_CHECK
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return(num-11);
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#endif
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/* scan over padding data */
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j=flen-1; /* one for type. */
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for (i=0; i<j; i++)
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if (*(p++) == 0) break;
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if (i == j)
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING);
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return(-1);
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}
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if (i < 8)
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT);
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return(-1);
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}
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i++; /* Skip over the '\0' */
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j-=i;
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if (j > tlen)
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE);
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return(-1);
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}
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memcpy(to,p,(unsigned int)j);
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return(j);
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}
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