You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
567 lines
16 KiB
567 lines
16 KiB
/* crypto/bn/bn_mont.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.]
|
|
*/
|
|
/* ====================================================================
|
|
* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
|
|
*
|
|
* 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 above 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 acknowledgment:
|
|
* "This product includes software developed by the OpenSSL Project
|
|
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
|
|
*
|
|
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
|
* endorse or promote products derived from this software without
|
|
* prior written permission. For written permission, please contact
|
|
* openssl-core@openssl.org.
|
|
*
|
|
* 5. Products derived from this software may not be called "OpenSSL"
|
|
* nor may "OpenSSL" appear in their names without prior written
|
|
* permission of the OpenSSL Project.
|
|
*
|
|
* 6. Redistributions of any form whatsoever must retain the following
|
|
* acknowledgment:
|
|
* "This product includes software developed by the OpenSSL Project
|
|
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
|
* EXPRESSED 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 OpenSSL PROJECT OR
|
|
* ITS 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.
|
|
* ====================================================================
|
|
*
|
|
* This product includes cryptographic software written by Eric Young
|
|
* (eay@cryptsoft.com). This product includes software written by Tim
|
|
* Hudson (tjh@cryptsoft.com).
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Details about Montgomery multiplication algorithms can be found at
|
|
* http://security.ece.orst.edu/publications.html, e.g.
|
|
* http://security.ece.orst.edu/koc/papers/j37acmon.pdf and
|
|
* sections 3.8 and 4.2 in http://security.ece.orst.edu/koc/papers/r01rsasw.pdf
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include "cryptlib.h"
|
|
#include "bn_lcl.h"
|
|
|
|
#define MONT_WORD /* use the faster word-based algorithm */
|
|
|
|
#ifdef MONT_WORD
|
|
static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont);
|
|
#endif
|
|
|
|
int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
|
|
BN_MONT_CTX *mont, BN_CTX *ctx)
|
|
{
|
|
BIGNUM *tmp;
|
|
int ret=0;
|
|
#if defined(OPENSSL_BN_ASM_MONT) && defined(MONT_WORD)
|
|
int num = mont->N.top;
|
|
|
|
if (num>1 && a->top==num && b->top==num)
|
|
{
|
|
if (bn_wexpand(r,num) == NULL) return(0);
|
|
if (bn_mul_mont(r->d,a->d,b->d,mont->N.d,mont->n0,num))
|
|
{
|
|
r->neg = a->neg^b->neg;
|
|
r->top = num;
|
|
bn_correct_top(r);
|
|
return(1);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
BN_CTX_start(ctx);
|
|
tmp = BN_CTX_get(ctx);
|
|
if (tmp == NULL) goto err;
|
|
|
|
bn_check_top(tmp);
|
|
if (a == b)
|
|
{
|
|
if (!BN_sqr(tmp,a,ctx)) goto err;
|
|
}
|
|
else
|
|
{
|
|
if (!BN_mul(tmp,a,b,ctx)) goto err;
|
|
}
|
|
/* reduce from aRR to aR */
|
|
#ifdef MONT_WORD
|
|
if (!BN_from_montgomery_word(r,tmp,mont)) goto err;
|
|
#else
|
|
if (!BN_from_montgomery(r,tmp,mont,ctx)) goto err;
|
|
#endif
|
|
bn_check_top(r);
|
|
ret=1;
|
|
err:
|
|
BN_CTX_end(ctx);
|
|
return(ret);
|
|
}
|
|
|
|
#ifdef MONT_WORD
|
|
static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont)
|
|
{
|
|
BIGNUM *n;
|
|
BN_ULONG *ap,*np,*rp,n0,v,*nrp;
|
|
int al,nl,max,i,x,ri;
|
|
|
|
n= &(mont->N);
|
|
/* mont->ri is the size of mont->N in bits (rounded up
|
|
to the word size) */
|
|
al=ri=mont->ri/BN_BITS2;
|
|
|
|
nl=n->top;
|
|
if ((al == 0) || (nl == 0)) { ret->top=0; return(1); }
|
|
|
|
max=(nl+al+1); /* allow for overflow (no?) XXX */
|
|
if (bn_wexpand(r,max) == NULL) return(0);
|
|
|
|
r->neg^=n->neg;
|
|
np=n->d;
|
|
rp=r->d;
|
|
nrp= &(r->d[nl]);
|
|
|
|
/* clear the top words of T */
|
|
#if 1
|
|
for (i=r->top; i<max; i++) /* memset? XXX */
|
|
r->d[i]=0;
|
|
#else
|
|
memset(&(r->d[r->top]),0,(max-r->top)*sizeof(BN_ULONG));
|
|
#endif
|
|
|
|
r->top=max;
|
|
n0=mont->n0[0];
|
|
|
|
#ifdef BN_COUNT
|
|
fprintf(stderr,"word BN_from_montgomery_word %d * %d\n",nl,nl);
|
|
#endif
|
|
for (i=0; i<nl; i++)
|
|
{
|
|
#ifdef __TANDEM
|
|
{
|
|
long long t1;
|
|
long long t2;
|
|
long long t3;
|
|
t1 = rp[0] * (n0 & 0177777);
|
|
t2 = 037777600000l;
|
|
t2 = n0 & t2;
|
|
t3 = rp[0] & 0177777;
|
|
t2 = (t3 * t2) & BN_MASK2;
|
|
t1 = t1 + t2;
|
|
v=bn_mul_add_words(rp,np,nl,(BN_ULONG) t1);
|
|
}
|
|
#else
|
|
v=bn_mul_add_words(rp,np,nl,(rp[0]*n0)&BN_MASK2);
|
|
#endif
|
|
nrp++;
|
|
rp++;
|
|
if (((nrp[-1]+=v)&BN_MASK2) >= v)
|
|
continue;
|
|
else
|
|
{
|
|
if (((++nrp[0])&BN_MASK2) != 0) continue;
|
|
if (((++nrp[1])&BN_MASK2) != 0) continue;
|
|
for (x=2; (((++nrp[x])&BN_MASK2) == 0); x++) ;
|
|
}
|
|
}
|
|
bn_correct_top(r);
|
|
|
|
/* mont->ri will be a multiple of the word size and below code
|
|
* is kind of BN_rshift(ret,r,mont->ri) equivalent */
|
|
if (r->top <= ri)
|
|
{
|
|
ret->top=0;
|
|
return(1);
|
|
}
|
|
al=r->top-ri;
|
|
|
|
#define BRANCH_FREE 1
|
|
#if BRANCH_FREE
|
|
if (bn_wexpand(ret,ri) == NULL) return(0);
|
|
x=0-(((al-ri)>>(sizeof(al)*8-1))&1);
|
|
ret->top=x=(ri&~x)|(al&x); /* min(ri,al) */
|
|
ret->neg=r->neg;
|
|
|
|
rp=ret->d;
|
|
ap=&(r->d[ri]);
|
|
|
|
{
|
|
size_t m1,m2;
|
|
|
|
v=bn_sub_words(rp,ap,np,ri);
|
|
/* this ----------------^^ works even in al<ri case
|
|
* thanks to zealous zeroing of top of the vector in the
|
|
* beginning. */
|
|
|
|
/* if (al==ri && !v) || al>ri) nrp=rp; else nrp=ap; */
|
|
/* in other words if subtraction result is real, then
|
|
* trick unconditional memcpy below to perform in-place
|
|
* "refresh" instead of actual copy. */
|
|
m1=0-(size_t)(((al-ri)>>(sizeof(al)*8-1))&1); /* al<ri */
|
|
m2=0-(size_t)(((ri-al)>>(sizeof(al)*8-1))&1); /* al>ri */
|
|
m1|=m2; /* (al!=ri) */
|
|
m1|=(0-(size_t)v); /* (al!=ri || v) */
|
|
m1&=~m2; /* (al!=ri || v) && !al>ri */
|
|
nrp=(BN_ULONG *)(((size_t)rp&~m1)|((size_t)ap&m1));
|
|
}
|
|
|
|
/* 'i<ri' is chosen to eliminate dependency on input data, even
|
|
* though it results in redundant copy in al<ri case. */
|
|
for (i=0,ri-=4; i<ri; i+=4)
|
|
{
|
|
BN_ULONG t1,t2,t3,t4;
|
|
|
|
t1=nrp[i+0];
|
|
t2=nrp[i+1];
|
|
t3=nrp[i+2]; ap[i+0]=0;
|
|
t4=nrp[i+3]; ap[i+1]=0;
|
|
rp[i+0]=t1; ap[i+2]=0;
|
|
rp[i+1]=t2; ap[i+3]=0;
|
|
rp[i+2]=t3;
|
|
rp[i+3]=t4;
|
|
}
|
|
for (ri+=4; i<ri; i++)
|
|
rp[i]=nrp[i], ap[i]=0;
|
|
bn_correct_top(r);
|
|
bn_correct_top(ret);
|
|
#else
|
|
if (bn_wexpand(ret,al) == NULL) return(0);
|
|
ret->top=al;
|
|
ret->neg=r->neg;
|
|
|
|
rp=ret->d;
|
|
ap=&(r->d[ri]);
|
|
al-=4;
|
|
for (i=0; i<al; i+=4)
|
|
{
|
|
BN_ULONG t1,t2,t3,t4;
|
|
|
|
t1=ap[i+0];
|
|
t2=ap[i+1];
|
|
t3=ap[i+2];
|
|
t4=ap[i+3];
|
|
rp[i+0]=t1;
|
|
rp[i+1]=t2;
|
|
rp[i+2]=t3;
|
|
rp[i+3]=t4;
|
|
}
|
|
al+=4;
|
|
for (; i<al; i++)
|
|
rp[i]=ap[i];
|
|
|
|
if (BN_ucmp(ret, &(mont->N)) >= 0)
|
|
{
|
|
if (!BN_usub(ret,ret,&(mont->N))) return(0);
|
|
}
|
|
#endif
|
|
bn_check_top(ret);
|
|
|
|
return(1);
|
|
}
|
|
#endif /* MONT_WORD */
|
|
|
|
int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont,
|
|
BN_CTX *ctx)
|
|
{
|
|
int retn=0;
|
|
#ifdef MONT_WORD
|
|
BIGNUM *t;
|
|
|
|
BN_CTX_start(ctx);
|
|
if ((t = BN_CTX_get(ctx)) && BN_copy(t,a))
|
|
retn = BN_from_montgomery_word(ret,t,mont);
|
|
BN_CTX_end(ctx);
|
|
#else /* !MONT_WORD */
|
|
BIGNUM *t1,*t2;
|
|
|
|
BN_CTX_start(ctx);
|
|
t1 = BN_CTX_get(ctx);
|
|
t2 = BN_CTX_get(ctx);
|
|
if (t1 == NULL || t2 == NULL) goto err;
|
|
|
|
if (!BN_copy(t1,a)) goto err;
|
|
BN_mask_bits(t1,mont->ri);
|
|
|
|
if (!BN_mul(t2,t1,&mont->Ni,ctx)) goto err;
|
|
BN_mask_bits(t2,mont->ri);
|
|
|
|
if (!BN_mul(t1,t2,&mont->N,ctx)) goto err;
|
|
if (!BN_add(t2,a,t1)) goto err;
|
|
if (!BN_rshift(ret,t2,mont->ri)) goto err;
|
|
|
|
if (BN_ucmp(ret, &(mont->N)) >= 0)
|
|
{
|
|
if (!BN_usub(ret,ret,&(mont->N))) goto err;
|
|
}
|
|
retn=1;
|
|
bn_check_top(ret);
|
|
err:
|
|
BN_CTX_end(ctx);
|
|
#endif /* MONT_WORD */
|
|
return(retn);
|
|
}
|
|
|
|
BN_MONT_CTX *BN_MONT_CTX_new(void)
|
|
{
|
|
BN_MONT_CTX *ret;
|
|
|
|
if ((ret=(BN_MONT_CTX *)OPENSSL_malloc(sizeof(BN_MONT_CTX))) == NULL)
|
|
return(NULL);
|
|
|
|
BN_MONT_CTX_init(ret);
|
|
ret->flags=BN_FLG_MALLOCED;
|
|
return(ret);
|
|
}
|
|
|
|
void BN_MONT_CTX_init(BN_MONT_CTX *ctx)
|
|
{
|
|
ctx->ri=0;
|
|
BN_init(&(ctx->RR));
|
|
BN_init(&(ctx->N));
|
|
BN_init(&(ctx->Ni));
|
|
ctx->n0[0] = ctx->n0[1] = 0;
|
|
ctx->flags=0;
|
|
}
|
|
|
|
void BN_MONT_CTX_free(BN_MONT_CTX *mont)
|
|
{
|
|
if(mont == NULL)
|
|
return;
|
|
|
|
BN_free(&(mont->RR));
|
|
BN_free(&(mont->N));
|
|
BN_free(&(mont->Ni));
|
|
if (mont->flags & BN_FLG_MALLOCED)
|
|
OPENSSL_free(mont);
|
|
}
|
|
|
|
int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod, BN_CTX *ctx)
|
|
{
|
|
int ret = 0;
|
|
BIGNUM *Ri,*R;
|
|
|
|
BN_CTX_start(ctx);
|
|
if((Ri = BN_CTX_get(ctx)) == NULL) goto err;
|
|
R= &(mont->RR); /* grab RR as a temp */
|
|
if (!BN_copy(&(mont->N),mod)) goto err; /* Set N */
|
|
mont->N.neg = 0;
|
|
|
|
#ifdef MONT_WORD
|
|
{
|
|
BIGNUM tmod;
|
|
BN_ULONG buf[2];
|
|
|
|
BN_init(&tmod);
|
|
tmod.d=buf;
|
|
tmod.dmax=2;
|
|
tmod.neg=0;
|
|
|
|
mont->ri=(BN_num_bits(mod)+(BN_BITS2-1))/BN_BITS2*BN_BITS2;
|
|
|
|
#if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)
|
|
/* Only certain BN_BITS2<=32 platforms actually make use of
|
|
* n0[1], and we could use the #else case (with a shorter R
|
|
* value) for the others. However, currently only the assembler
|
|
* files do know which is which. */
|
|
|
|
BN_zero(R);
|
|
if (!(BN_set_bit(R,2*BN_BITS2))) goto err;
|
|
|
|
tmod.top=0;
|
|
if ((buf[0] = mod->d[0])) tmod.top=1;
|
|
if ((buf[1] = mod->top>1 ? mod->d[1] : 0)) tmod.top=2;
|
|
|
|
if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL)
|
|
goto err;
|
|
if (!BN_lshift(Ri,Ri,2*BN_BITS2)) goto err; /* R*Ri */
|
|
if (!BN_is_zero(Ri))
|
|
{
|
|
if (!BN_sub_word(Ri,1)) goto err;
|
|
}
|
|
else /* if N mod word size == 1 */
|
|
{
|
|
if (bn_expand(Ri,(int)sizeof(BN_ULONG)*2) == NULL)
|
|
goto err;
|
|
/* Ri-- (mod double word size) */
|
|
Ri->neg=0;
|
|
Ri->d[0]=BN_MASK2;
|
|
Ri->d[1]=BN_MASK2;
|
|
Ri->top=2;
|
|
}
|
|
if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err;
|
|
/* Ni = (R*Ri-1)/N,
|
|
* keep only couple of least significant words: */
|
|
mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
|
|
mont->n0[1] = (Ri->top > 1) ? Ri->d[1] : 0;
|
|
#else
|
|
BN_zero(R);
|
|
if (!(BN_set_bit(R,BN_BITS2))) goto err; /* R */
|
|
|
|
buf[0]=mod->d[0]; /* tmod = N mod word size */
|
|
buf[1]=0;
|
|
tmod.top = buf[0] != 0 ? 1 : 0;
|
|
/* Ri = R^-1 mod N*/
|
|
if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL)
|
|
goto err;
|
|
if (!BN_lshift(Ri,Ri,BN_BITS2)) goto err; /* R*Ri */
|
|
if (!BN_is_zero(Ri))
|
|
{
|
|
if (!BN_sub_word(Ri,1)) goto err;
|
|
}
|
|
else /* if N mod word size == 1 */
|
|
{
|
|
if (!BN_set_word(Ri,BN_MASK2)) goto err; /* Ri-- (mod word size) */
|
|
}
|
|
if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err;
|
|
/* Ni = (R*Ri-1)/N,
|
|
* keep only least significant word: */
|
|
mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
|
|
mont->n0[1] = 0;
|
|
#endif
|
|
}
|
|
#else /* !MONT_WORD */
|
|
{ /* bignum version */
|
|
mont->ri=BN_num_bits(&mont->N);
|
|
BN_zero(R);
|
|
if (!BN_set_bit(R,mont->ri)) goto err; /* R = 2^ri */
|
|
/* Ri = R^-1 mod N*/
|
|
if ((BN_mod_inverse(Ri,R,&mont->N,ctx)) == NULL)
|
|
goto err;
|
|
if (!BN_lshift(Ri,Ri,mont->ri)) goto err; /* R*Ri */
|
|
if (!BN_sub_word(Ri,1)) goto err;
|
|
/* Ni = (R*Ri-1) / N */
|
|
if (!BN_div(&(mont->Ni),NULL,Ri,&mont->N,ctx)) goto err;
|
|
}
|
|
#endif
|
|
|
|
/* setup RR for conversions */
|
|
BN_zero(&(mont->RR));
|
|
if (!BN_set_bit(&(mont->RR),mont->ri*2)) goto err;
|
|
if (!BN_mod(&(mont->RR),&(mont->RR),&(mont->N),ctx)) goto err;
|
|
|
|
ret = 1;
|
|
err:
|
|
BN_CTX_end(ctx);
|
|
return ret;
|
|
}
|
|
|
|
BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to, BN_MONT_CTX *from)
|
|
{
|
|
if (to == from) return(to);
|
|
|
|
if (!BN_copy(&(to->RR),&(from->RR))) return NULL;
|
|
if (!BN_copy(&(to->N),&(from->N))) return NULL;
|
|
if (!BN_copy(&(to->Ni),&(from->Ni))) return NULL;
|
|
to->ri=from->ri;
|
|
to->n0[0]=from->n0[0];
|
|
to->n0[1]=from->n0[1];
|
|
return(to);
|
|
}
|
|
|
|
BN_MONT_CTX *BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, int lock,
|
|
const BIGNUM *mod, BN_CTX *ctx)
|
|
{
|
|
int got_write_lock = 0;
|
|
BN_MONT_CTX *ret;
|
|
|
|
CRYPTO_r_lock(lock);
|
|
if (!*pmont)
|
|
{
|
|
CRYPTO_r_unlock(lock);
|
|
CRYPTO_w_lock(lock);
|
|
got_write_lock = 1;
|
|
|
|
if (!*pmont)
|
|
{
|
|
ret = BN_MONT_CTX_new();
|
|
if (ret && !BN_MONT_CTX_set(ret, mod, ctx))
|
|
BN_MONT_CTX_free(ret);
|
|
else
|
|
*pmont = ret;
|
|
}
|
|
}
|
|
|
|
ret = *pmont;
|
|
|
|
if (got_write_lock)
|
|
CRYPTO_w_unlock(lock);
|
|
else
|
|
CRYPTO_r_unlock(lock);
|
|
|
|
return ret;
|
|
}
|
|
|