kopia lustrzana https://github.com/ryukoposting/Signal-Android
225 wiersze
6.2 KiB
C
225 wiersze
6.2 KiB
C
![]() |
/* crypto/rsa/rsa_pk1.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/rand.h>
|
||
|
|
||
|
int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
|
||
|
const unsigned char *from, int flen)
|
||
|
{
|
||
|
int j;
|
||
|
unsigned char *p;
|
||
|
|
||
|
if (flen > (tlen-RSA_PKCS1_PADDING_SIZE))
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
p=(unsigned char *)to;
|
||
|
|
||
|
*(p++)=0;
|
||
|
*(p++)=1; /* Private Key BT (Block Type) */
|
||
|
|
||
|
/* pad out with 0xff data */
|
||
|
j=tlen-3-flen;
|
||
|
memset(p,0xff,j);
|
||
|
p+=j;
|
||
|
*(p++)='\0';
|
||
|
memcpy(p,from,(unsigned int)flen);
|
||
|
return(1);
|
||
|
}
|
||
|
|
||
|
int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
|
||
|
const unsigned char *from, int flen, int num)
|
||
|
{
|
||
|
int i,j;
|
||
|
const unsigned char *p;
|
||
|
|
||
|
p=from;
|
||
|
if ((num != (flen+1)) || (*(p++) != 01))
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BLOCK_TYPE_IS_NOT_01);
|
||
|
return(-1);
|
||
|
}
|
||
|
|
||
|
/* scan over padding data */
|
||
|
j=flen-1; /* one for type. */
|
||
|
for (i=0; i<j; i++)
|
||
|
{
|
||
|
if (*p != 0xff) /* should decrypt to 0xff */
|
||
|
{
|
||
|
if (*p == 0)
|
||
|
{ p++; break; }
|
||
|
else {
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_FIXED_HEADER_DECRYPT);
|
||
|
return(-1);
|
||
|
}
|
||
|
}
|
||
|
p++;
|
||
|
}
|
||
|
|
||
|
if (i == j)
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_NULL_BEFORE_BLOCK_MISSING);
|
||
|
return(-1);
|
||
|
}
|
||
|
|
||
|
if (i < 8)
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_PAD_BYTE_COUNT);
|
||
|
return(-1);
|
||
|
}
|
||
|
i++; /* Skip over the '\0' */
|
||
|
j-=i;
|
||
|
if (j > tlen)
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE);
|
||
|
return(-1);
|
||
|
}
|
||
|
memcpy(to,p,(unsigned int)j);
|
||
|
|
||
|
return(j);
|
||
|
}
|
||
|
|
||
|
int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
|
||
|
const unsigned char *from, int flen)
|
||
|
{
|
||
|
int i,j;
|
||
|
unsigned char *p;
|
||
|
|
||
|
if (flen > (tlen-11))
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
p=(unsigned char *)to;
|
||
|
|
||
|
*(p++)=0;
|
||
|
*(p++)=2; /* Public Key BT (Block Type) */
|
||
|
|
||
|
/* pad out with non-zero random data */
|
||
|
j=tlen-3-flen;
|
||
|
|
||
|
if (RAND_bytes(p,j) <= 0)
|
||
|
return(0);
|
||
|
for (i=0; i<j; i++)
|
||
|
{
|
||
|
if (*p == '\0')
|
||
|
do {
|
||
|
if (RAND_bytes(p,1) <= 0)
|
||
|
return(0);
|
||
|
} while (*p == '\0');
|
||
|
p++;
|
||
|
}
|
||
|
|
||
|
*(p++)='\0';
|
||
|
|
||
|
memcpy(p,from,(unsigned int)flen);
|
||
|
return(1);
|
||
|
}
|
||
|
|
||
|
int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
|
||
|
const unsigned char *from, int flen, int num)
|
||
|
{
|
||
|
int i,j;
|
||
|
const unsigned char *p;
|
||
|
|
||
|
p=from;
|
||
|
if ((num != (flen+1)) || (*(p++) != 02))
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02);
|
||
|
return(-1);
|
||
|
}
|
||
|
#ifdef PKCS1_CHECK
|
||
|
return(num-11);
|
||
|
#endif
|
||
|
|
||
|
/* scan over padding data */
|
||
|
j=flen-1; /* one for type. */
|
||
|
for (i=0; i<j; i++)
|
||
|
if (*(p++) == 0) break;
|
||
|
|
||
|
if (i == j)
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING);
|
||
|
return(-1);
|
||
|
}
|
||
|
|
||
|
if (i < 8)
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT);
|
||
|
return(-1);
|
||
|
}
|
||
|
i++; /* Skip over the '\0' */
|
||
|
j-=i;
|
||
|
if (j > tlen)
|
||
|
{
|
||
|
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE);
|
||
|
return(-1);
|
||
|
}
|
||
|
memcpy(to,p,(unsigned int)j);
|
||
|
|
||
|
return(j);
|
||
|
}
|
||
|
|