diff options
Diffstat (limited to 'package/ead/src/tinysrp/bn_sqr.c')
| -rw-r--r-- | package/ead/src/tinysrp/bn_sqr.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/package/ead/src/tinysrp/bn_sqr.c b/package/ead/src/tinysrp/bn_sqr.c new file mode 100644 index 0000000000..2d3db70e35 --- /dev/null +++ b/package/ead/src/tinysrp/bn_sqr.c @@ -0,0 +1,160 @@ +/* crypto/bn/bn_sqr.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 <string.h> +#include "bn_lcl.h" + +/* r must not be a */ +/* I've just gone over this and it is now %20 faster on x86 - eay - 27 Jun 96 */ +int BN_sqr(BIGNUM *r, BIGNUM *a, BN_CTX *ctx) + { + int max,al; + int ret = 0; + BIGNUM *tmp,*rr; + +#ifdef BN_COUNT +printf("BN_sqr %d * %d\n",a->top,a->top); +#endif + bn_check_top(a); + + al=a->top; + if (al <= 0) + { + r->top=0; + return(1); + } + + BN_CTX_start(ctx); + rr=(a != r) ? r : BN_CTX_get(ctx); + tmp=BN_CTX_get(ctx); + if (tmp == NULL) goto err; + + max=(al+al); + if (bn_wexpand(rr,max+1) == NULL) goto err; + + r->neg=0; + if (al == 4) + { +#ifndef BN_SQR_COMBA + BN_ULONG t[8]; + bn_sqr_normal(rr->d,a->d,4,t); +#else + bn_sqr_comba4(rr->d,a->d); +#endif + } + else if (al == 8) + { +#ifndef BN_SQR_COMBA + BN_ULONG t[16]; + bn_sqr_normal(rr->d,a->d,8,t); +#else + bn_sqr_comba8(rr->d,a->d); +#endif + } + else + { + if (bn_wexpand(tmp,max) == NULL) goto err; + bn_sqr_normal(rr->d,a->d,al,tmp->d); + } + + rr->top=max; + if ((max > 0) && (rr->d[max-1] == 0)) rr->top--; + if (rr != r) BN_copy(r,rr); + ret = 1; + err: + BN_CTX_end(ctx); + return(ret); + } + +/* tmp must have 2*n words */ +void bn_sqr_normal(BN_ULONG *r, BN_ULONG *a, int n, BN_ULONG *tmp) + { + int i,j,max; + BN_ULONG *ap,*rp; + + max=n*2; + ap=a; + rp=r; + rp[0]=rp[max-1]=0; + rp++; + j=n; + + if (--j > 0) + { + ap++; + rp[j]=bn_mul_words(rp,ap,j,ap[-1]); + rp+=2; + } + + for (i=n-2; i>0; i--) + { + j--; + ap++; + rp[j]=bn_mul_add_words(rp,ap,j,ap[-1]); + rp+=2; + } + + bn_add_words(r,r,r,max); + + /* There will not be a carry */ + + bn_sqr_words(tmp,a,n); + + bn_add_words(r,r,tmp,max); + } |