99 lines
4.0 KiB
C
99 lines
4.0 KiB
C
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/***************************************************************************
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*
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Copyright 2013 CertiVox UK Ltd. *
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*
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This file is part of CertiVox MIRACL Crypto SDK. *
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*
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The CertiVox MIRACL Crypto SDK provides developers with an *
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extensive and efficient set of cryptographic functions. *
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For further information about its features and functionalities please *
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refer to http://www.certivox.com *
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*
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* The CertiVox MIRACL Crypto SDK is free software: you can *
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redistribute it and/or modify it under the terms of the *
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GNU Affero General Public License as published by the *
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Free Software Foundation, either version 3 of the License, *
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or (at your option) any later version. *
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*
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* The CertiVox MIRACL Crypto SDK is distributed in the hope *
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that it will be useful, but WITHOUT ANY WARRANTY; without even the *
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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See the GNU Affero General Public License for more details. *
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*
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* You should have received a copy of the GNU Affero General Public *
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License along with CertiVox MIRACL Crypto SDK. *
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If not, see <http://www.gnu.org/licenses/>. *
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*
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You can be released from the requirements of the license by purchasing *
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a commercial license. Buying such a license is mandatory as soon as you *
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develop commercial activities involving the CertiVox MIRACL Crypto SDK *
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without disclosing the source code of your own applications, or shipping *
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the CertiVox MIRACL Crypto SDK with a closed source product. *
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*
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***************************************************************************/
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/*
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* MIRACL calculate pi - by Gauss-Legendre method
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* mrpi.c
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*/
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#include <stdlib.h>
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#include "miracl.h"
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#ifdef MR_FLASH
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void fpi(_MIPD_ flash pi)
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{ /* Calculate pi using Guass-Legendre method */
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int x,nits,op[5];
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#ifdef MR_OS_THREADS
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miracl *mr_mip=get_mip();
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#endif
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if (mr_mip->ERNUM) return;
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MR_IN(53)
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if (size(mr_mip->pi)!=0)
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{
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copy(mr_mip->pi,pi);
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mr_mip->EXACT=FALSE;
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MR_OUT
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return;
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}
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fconv(_MIPP_ 1,2,mr_mip->pi);
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froot(_MIPP_ mr_mip->pi,2,mr_mip->pi);
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fconv(_MIPP_ 1,1,mr_mip->w11);
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fconv(_MIPP_ 1,4,mr_mip->w12);
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x=1;
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op[0]=0x6C;
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op[1]=1;
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op[4]=0;
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nits=mr_mip->lg2b*mr_mip->nib/4;
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while (x<nits)
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{
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copy(mr_mip->w11,mr_mip->w13);
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op[2]=1;
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op[3]=2;
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flop(_MIPP_ mr_mip->w11,mr_mip->pi,op,mr_mip->w11);
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fmul(_MIPP_ mr_mip->pi,mr_mip->w13,mr_mip->pi);
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froot(_MIPP_ mr_mip->pi,2,mr_mip->pi);
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fsub(_MIPP_ mr_mip->w11,mr_mip->w13,mr_mip->w13);
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fmul(_MIPP_ mr_mip->w13,mr_mip->w13,mr_mip->w13);
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op[3]=1;
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op[2]=(-x);
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flop(_MIPP_ mr_mip->w12,mr_mip->w13,op,mr_mip->w12); /* w12 = w12 - x.w13 */
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x*=2;
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}
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fadd(_MIPP_ mr_mip->w11,mr_mip->pi,mr_mip->pi);
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fmul(_MIPP_ mr_mip->pi,mr_mip->pi,mr_mip->pi);
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op[0]=0x48;
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op[2]=0;
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op[3]=4;
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flop(_MIPP_ mr_mip->pi,mr_mip->w12,op,mr_mip->pi); /* pi = pi/(4.w12) */
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if (pi!=NULL) copy(mr_mip->pi,pi);
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MR_OUT
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}
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#endif
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