mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-23 08:27:30 +00:00
131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/* crypto/bn/bn_mpi.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 "bn_lcl.h"
|
|
|
|
int BN_bn2mpi(const BIGNUM *a, unsigned char *d)
|
|
{
|
|
int bits;
|
|
int num=0;
|
|
int ext=0;
|
|
long l;
|
|
|
|
bits=BN_num_bits(a);
|
|
num=(bits+7)/8;
|
|
if (bits > 0)
|
|
{
|
|
ext=((bits & 0x07) == 0);
|
|
}
|
|
if (d == NULL)
|
|
return(num+4+ext);
|
|
|
|
l=num+ext;
|
|
d[0]=(unsigned char)(l>>24)&0xff;
|
|
d[1]=(unsigned char)(l>>16)&0xff;
|
|
d[2]=(unsigned char)(l>> 8)&0xff;
|
|
d[3]=(unsigned char)(l )&0xff;
|
|
if (ext) d[4]=0;
|
|
num=BN_bn2bin(a,&(d[4+ext]));
|
|
if (a->neg)
|
|
d[4]|=0x80;
|
|
return(num+4+ext);
|
|
}
|
|
|
|
BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *a)
|
|
{
|
|
long len;
|
|
int neg=0;
|
|
|
|
if (n < 4)
|
|
{
|
|
BNerr(BN_F_BN_MPI2BN,BN_R_INVALID_LENGTH);
|
|
return(NULL);
|
|
}
|
|
len=((long)d[0]<<24)|((long)d[1]<<16)|((int)d[2]<<8)|(int)d[3];
|
|
if ((len+4) != n)
|
|
{
|
|
BNerr(BN_F_BN_MPI2BN,BN_R_ENCODING_ERROR);
|
|
return(NULL);
|
|
}
|
|
|
|
if (a == NULL) a=BN_new();
|
|
if (a == NULL) return(NULL);
|
|
|
|
if (len == 0)
|
|
{
|
|
a->neg=0;
|
|
a->top=0;
|
|
return(a);
|
|
}
|
|
d+=4;
|
|
if ((*d) & 0x80)
|
|
neg=1;
|
|
if (BN_bin2bn(d,(int)len,a) == NULL)
|
|
return(NULL);
|
|
a->neg=neg;
|
|
if (neg)
|
|
{
|
|
BN_clear_bit(a,BN_num_bits(a)-1);
|
|
}
|
|
bn_check_top(a);
|
|
return(a);
|
|
}
|
|
|