149 lines
4.5 KiB
C
Executable File
149 lines
4.5 KiB
C
Executable File
/* crypto/bn/bn_lib.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 "cryptlib.h"
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#include "bn_lcl.h"
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void BN_free(BIGNUM *a)
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{
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if (a == NULL) return;
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bn_check_top(a);
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if ((a->d != NULL) && !(BN_get_flags(a,BN_FLG_STATIC_DATA)))
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OPENSSL_free(a->d);
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if (a->flags & BN_FLG_MALLOCED)
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OPENSSL_free(a);
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else
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{
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a->d = NULL;
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}
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}
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BIGNUM *BN_dup(const BIGNUM *a)
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{
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BIGNUM *t;
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if (a == NULL) return NULL;
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bn_check_top(a);
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t = BN_new();
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if (t == NULL) return NULL;
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if(!BN_copy(t, a))
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{
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BN_free(t);
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return NULL;
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}
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bn_check_top(t);
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return t;
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}
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BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
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{
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int i;
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BN_ULONG *A;
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const BN_ULONG *B;
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bn_check_top(b);
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if (a == b) return(a);
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if (bn_wexpand(a,b->top) == NULL) return(NULL);
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#if 1
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A=a->d;
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B=b->d;
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for (i=b->top>>2; i>0; i--,A+=4,B+=4)
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{
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BN_ULONG a0,a1,a2,a3;
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a0=B[0]; a1=B[1]; a2=B[2]; a3=B[3];
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A[0]=a0; A[1]=a1; A[2]=a2; A[3]=a3;
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}
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switch (b->top&3)
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{
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case 3: A[2]=B[2];
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case 2: A[1]=B[1];
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case 1: A[0]=B[0];
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case 0: ; /* ultrix cc workaround, see comments in bn_expand_internal */
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}
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#else
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memcpy(a->d,b->d,sizeof(b->d[0])*b->top);
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#endif
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a->top=b->top;
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a->neg=b->neg;
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bn_check_top(a);
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return(a);
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}
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int BN_set_word(BIGNUM *a, BN_ULONG w)
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{
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bn_check_top(a);
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if (bn_expand(a,(int)sizeof(BN_ULONG)*8) == NULL) return(0);
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a->neg = 0;
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a->d[0] = w;
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a->top = (w ? 1 : 0);
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bn_check_top(a);
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return(1);
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}
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void BN_set_negative(BIGNUM *a, int b)
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{
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if (b && !BN_is_zero(a))
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a->neg = 1;
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else
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a->neg = 0;
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}
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