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/* 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);
}
return(a);
}
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