1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/ossrv/ssl/libcrypto/src/crypto/bn/bn_mpi.c Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,130 @@
1.4 +/* crypto/bn/bn_mpi.c */
1.5 +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
1.6 + * All rights reserved.
1.7 + *
1.8 + * This package is an SSL implementation written
1.9 + * by Eric Young (eay@cryptsoft.com).
1.10 + * The implementation was written so as to conform with Netscapes SSL.
1.11 + *
1.12 + * This library is free for commercial and non-commercial use as long as
1.13 + * the following conditions are aheared to. The following conditions
1.14 + * apply to all code found in this distribution, be it the RC4, RSA,
1.15 + * lhash, DES, etc., code; not just the SSL code. The SSL documentation
1.16 + * included with this distribution is covered by the same copyright terms
1.17 + * except that the holder is Tim Hudson (tjh@cryptsoft.com).
1.18 + *
1.19 + * Copyright remains Eric Young's, and as such any Copyright notices in
1.20 + * the code are not to be removed.
1.21 + * If this package is used in a product, Eric Young should be given attribution
1.22 + * as the author of the parts of the library used.
1.23 + * This can be in the form of a textual message at program startup or
1.24 + * in documentation (online or textual) provided with the package.
1.25 + *
1.26 + * Redistribution and use in source and binary forms, with or without
1.27 + * modification, are permitted provided that the following conditions
1.28 + * are met:
1.29 + * 1. Redistributions of source code must retain the copyright
1.30 + * notice, this list of conditions and the following disclaimer.
1.31 + * 2. Redistributions in binary form must reproduce the above copyright
1.32 + * notice, this list of conditions and the following disclaimer in the
1.33 + * documentation and/or other materials provided with the distribution.
1.34 + * 3. All advertising materials mentioning features or use of this software
1.35 + * must display the following acknowledgement:
1.36 + * "This product includes cryptographic software written by
1.37 + * Eric Young (eay@cryptsoft.com)"
1.38 + * The word 'cryptographic' can be left out if the rouines from the library
1.39 + * being used are not cryptographic related :-).
1.40 + * 4. If you include any Windows specific code (or a derivative thereof) from
1.41 + * the apps directory (application code) you must include an acknowledgement:
1.42 + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
1.43 + *
1.44 + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
1.45 + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.46 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.47 + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
1.48 + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1.49 + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1.50 + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.51 + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1.52 + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1.53 + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1.54 + * SUCH DAMAGE.
1.55 + *
1.56 + * The licence and distribution terms for any publically available version or
1.57 + * derivative of this code cannot be changed. i.e. this code cannot simply be
1.58 + * copied and put under another distribution licence
1.59 + * [including the GNU Public Licence.]
1.60 + */
1.61 +
1.62 +#include <stdio.h>
1.63 +#include "cryptlib.h"
1.64 +#include "bn_lcl.h"
1.65 +
1.66 +EXPORT_C int BN_bn2mpi(const BIGNUM *a, unsigned char *d)
1.67 + {
1.68 + int bits;
1.69 + int num=0;
1.70 + int ext=0;
1.71 + long l;
1.72 +
1.73 + bits=BN_num_bits(a);
1.74 + num=(bits+7)/8;
1.75 + if (bits > 0)
1.76 + {
1.77 + ext=((bits & 0x07) == 0);
1.78 + }
1.79 + if (d == NULL)
1.80 + return(num+4+ext);
1.81 +
1.82 + l=num+ext;
1.83 + d[0]=(unsigned char)(l>>24)&0xff;
1.84 + d[1]=(unsigned char)(l>>16)&0xff;
1.85 + d[2]=(unsigned char)(l>> 8)&0xff;
1.86 + d[3]=(unsigned char)(l )&0xff;
1.87 + if (ext) d[4]=0;
1.88 + num=BN_bn2bin(a,&(d[4+ext]));
1.89 + if (a->neg)
1.90 + d[4]|=0x80;
1.91 + return(num+4+ext);
1.92 + }
1.93 +
1.94 +EXPORT_C BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *a)
1.95 + {
1.96 + long len;
1.97 + int neg=0;
1.98 +
1.99 + if (n < 4)
1.100 + {
1.101 + BNerr(BN_F_BN_MPI2BN,BN_R_INVALID_LENGTH);
1.102 + return(NULL);
1.103 + }
1.104 + len=((long)d[0]<<24)|((long)d[1]<<16)|((int)d[2]<<8)|(int)d[3];
1.105 + if ((len+4) != n)
1.106 + {
1.107 + BNerr(BN_F_BN_MPI2BN,BN_R_ENCODING_ERROR);
1.108 + return(NULL);
1.109 + }
1.110 +
1.111 + if (a == NULL) a=BN_new();
1.112 + if (a == NULL) return(NULL);
1.113 +
1.114 + if (len == 0)
1.115 + {
1.116 + a->neg=0;
1.117 + a->top=0;
1.118 + return(a);
1.119 + }
1.120 + d+=4;
1.121 + if ((*d) & 0x80)
1.122 + neg=1;
1.123 + if (BN_bin2bn(d,(int)len,a) == NULL)
1.124 + return(NULL);
1.125 + a->neg=neg;
1.126 + if (neg)
1.127 + {
1.128 + BN_clear_bit(a,BN_num_bits(a)-1);
1.129 + }
1.130 + bn_check_top(a);
1.131 + return(a);
1.132 + }
1.133 +