216 lines
6.2 KiB
C
216 lines
6.2 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 I/O routines 2.
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* mrio2.c
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*/
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#include "miracl.h"
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#ifndef MR_SIMPLE_BASE
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#ifndef MR_SIMPLE_IO
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static void cbase(_MIPD_ big x,mr_small oldbase,big y)
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{ /* change radix of x from oldbase to base */
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int i,s;
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mr_small n;
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BOOL done;
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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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if (mr_mip->base==oldbase)
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{
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copy(x,y);
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return;
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}
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MR_IN(13)
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s=exsign(x);
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#ifdef MR_FLASH
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numer(_MIPP_ x,mr_mip->w1);
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denom(_MIPP_ x,mr_mip->w2);
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done=FALSE;
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#else
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copy(x,mr_mip->w1);
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done=TRUE;
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#endif
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insign(PLUS,mr_mip->w1);
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forever
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{
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zero(mr_mip->w6);
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convert(_MIPP_ 1,mr_mip->w0);
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for (i=0;i<(int)mr_mip->w1->len;i++)
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{ /* this is a bit slow - but not time critical */
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mr_pmul(_MIPP_ mr_mip->w0,mr_mip->w1->w[i],mr_mip->w5);
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add(_MIPP_ mr_mip->w6,mr_mip->w5,mr_mip->w6);
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if (oldbase==0)
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{ /* bit of a frig! */
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n=mr_shiftbits(1,MIRACL/2);
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mr_pmul(_MIPP_ mr_mip->w0,n,mr_mip->w0);
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mr_pmul(_MIPP_ mr_mip->w0,n,mr_mip->w0);
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}
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else mr_pmul(_MIPP_ mr_mip->w0,oldbase,mr_mip->w0);
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}
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if (mr_mip->ERNUM || done) break;
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#ifdef MR_FLASH
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copy(mr_mip->w2,mr_mip->w1);
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copy(mr_mip->w6,mr_mip->w7);
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done=TRUE;
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#endif
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}
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#ifdef MR_FLASH
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fpack(_MIPP_ mr_mip->w7,mr_mip->w6,y);
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#else
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copy(mr_mip->w6,y);
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#endif
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insign(s,y);
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MR_OUT
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}
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int cinstr(_MIPD_ flash x,char *string)
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{ /* input big number in base IOBASE */
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mr_small newb,oldb,b;
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mr_lentype lx;
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int ipt;
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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 0;
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MR_IN(78)
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newb=mr_mip->IOBASE;
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oldb=mr_mip->apbase;
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mr_setbase(_MIPP_ newb); /* temporarily change base ... */
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b=mr_mip->base;
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mr_mip->check=OFF;
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ipt=instr(_MIPP_ mr_mip->w5,string); /* ... and get number */
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mr_mip->check=ON;
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lx=(mr_mip->w5->len&MR_OBITS);
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#ifdef MR_FLASH
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if ((int)(lx&MR_MSK)>mr_mip->nib || (int)((lx>>MR_BTS)&MR_MSK)>mr_mip->nib)
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#else
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if ((int)lx>mr_mip->nib)
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#endif
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{ /* numerator or denominator too big */
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mr_berror(_MIPP_ MR_ERR_OVERFLOW);
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MR_OUT
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return 0;
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}
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mr_setbase(_MIPP_ oldb); /* restore original base */
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cbase(_MIPP_ mr_mip->w5,b,x);
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MR_OUT
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return ipt;
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}
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int cotstr(_MIPD_ flash x,char *string)
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{ /* output a big number in base IOBASE */
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mr_small newb,oldb,b;
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int ipt;
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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 0;
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MR_IN(77)
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newb=mr_mip->IOBASE;
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oldb=mr_mip->apbase;
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b=mr_mip->base;
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mr_setbase(_MIPP_ newb); /* temporarily change base ... */
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mr_mip->check=OFF;
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cbase(_MIPP_ x,b,mr_mip->w5); /* number may get bigger ! */
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mr_mip->check=ON;
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ipt=otstr(_MIPP_ mr_mip->w5,string); /*..... and output number */
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zero(mr_mip->w5);
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mr_setbase(_MIPP_ oldb);
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MR_OUT
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return ipt;
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}
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#ifndef MR_NO_FILE_IO
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int cinnum(_MIPD_ flash x,FILE *filep)
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{ /* convert from string to flash x */
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int n;
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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 0;
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MR_IN(14)
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mr_mip->infile=filep;
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mr_mip->fin=TRUE;
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n=cinstr(_MIPP_ x,NULL);
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mr_mip->fin=FALSE;
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MR_OUT
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return n;
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}
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int cotnum(_MIPD_ flash x,FILE *filep)
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{ /* convert flash to string */
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int n;
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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 0;
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MR_IN(15)
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mr_mip->otfile=filep;
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mr_mip->fout=TRUE;
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n=cotstr(_MIPP_ x,NULL);
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mr_mip->fout=FALSE;
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MR_OUT
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return n;
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}
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#endif
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#endif
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#endif
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