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Diffstat (limited to 'crypto/bn/bn_word.c')
-rw-r--r-- | crypto/bn/bn_word.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/crypto/bn/bn_word.c b/crypto/bn/bn_word.c new file mode 100644 index 0000000000..b61ddd95ce --- /dev/null +++ b/crypto/bn/bn_word.c @@ -0,0 +1,155 @@ +/* crypto/bn/bn_word.c */ +/* Copyright (C) 1995-1997 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" + +BN_ULONG BN_mod_word(a, w) +BIGNUM *a; +unsigned long w; + { +#ifndef BN_LLONG + BN_ULONG ret=0; +#else + BN_ULLONG ret=0; +#endif + int i; + + for (i=a->top-1; i>=0; i--) + { +#ifndef BN_LLONG + ret=((ret<<BN_BITS4)|((a->d[i]>>BN_BITS4)&BN_MASK2l))%(int)w; + ret=((ret<<BN_BITS4)|(a->d[i]&BN_MASK2l))%(int)w; +#else + ret=(BN_ULLONG)(((ret<<(BN_ULLONG)BN_BITS2)|a->d[i])% + (BN_ULLONG)w); +#endif + } + return((BN_ULONG)ret); + } + +BN_ULONG BN_div_word(a, w) +BIGNUM *a; +unsigned long w; + { + BN_ULONG ret; + int i; + + if (a->top == 0) return(0); + ret=0; + for (i=a->top-1; i>=0; i--) + { +#ifndef BN_LLONG + ret=((ret<<BN_BITS4)|((a->d[i]>>BN_BITS4)&BN_MASK2l))%(int)w; + ret=((ret<<BN_BITS4)|(a->d[i]&BN_MASK2l))%(int)w; +#else + BN_ULLONG ll; + + ll=((BN_ULLONG)ret<<(BN_ULONG)BN_BITS2)|a->d[i]; + a->d[i]=(BN_ULONG)(ll/w); + ret=(BN_ULONG)(ll%w); +#endif + } + if (a->d[a->top-1] == 0) + a->top--; + return(ret); + } + +int BN_add_word(a, w) +BIGNUM *a; +unsigned long w; + { + BN_ULONG l; + int i; + + if (bn_expand(a,a->top*BN_BITS2+1) == NULL) return(0); + i=0; + for (;;) + { + l=(a->d[i]+(BN_ULONG)w)&BN_MASK2; + a->d[i]=l; + if (w > l) + w=1; + else + break; + i++; + } + if (i >= a->top) + a->top++; + return(1); + } + +#ifdef undef +BN_ULONG *BN_mod_inverse_word(a) +BN_ULONG a; + { + BN_ULONG A,B,X,Y,M,D,R,RET,T; + int sign,hight=1; + + X=0; + Y=1; + A=0; + B=a; + sign=1; + + while (B != 0) + { + +#endif + |