4cd640f684
Same rationale as the previous commits.
(cherry picked from commit 422196759f)
Removed the winrt-specific parts.
558 lines
17 KiB
C
558 lines
17 KiB
C
/* 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, carry;
|
|
int nl, max, i;
|
|
|
|
n = &(mont->N);
|
|
nl = n->top;
|
|
if (nl == 0) {
|
|
ret->top = 0;
|
|
return (1);
|
|
}
|
|
|
|
max = (2 * nl); /* carry is stored separately */
|
|
if (bn_wexpand(r, max) == NULL)
|
|
return (0);
|
|
|
|
r->neg ^= n->neg;
|
|
np = n->d;
|
|
rp = r->d;
|
|
|
|
/* clear the top words of T */
|
|
# if 1
|
|
for (i = r->top; i < max; i++) /* memset? XXX */
|
|
rp[i] = 0;
|
|
# else
|
|
memset(&(rp[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 (carry = 0, i = 0; i < nl; i++, rp++) {
|
|
# 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
|
|
v = (v + carry + rp[nl]) & BN_MASK2;
|
|
carry |= (v != rp[nl]);
|
|
carry &= (v <= rp[nl]);
|
|
rp[nl] = v;
|
|
}
|
|
|
|
if (bn_wexpand(ret, nl) == NULL)
|
|
return (0);
|
|
ret->top = nl;
|
|
ret->neg = r->neg;
|
|
|
|
rp = ret->d;
|
|
ap = &(r->d[nl]);
|
|
|
|
# define BRANCH_FREE 1
|
|
# if BRANCH_FREE
|
|
{
|
|
BN_ULONG *nrp;
|
|
size_t m;
|
|
|
|
v = bn_sub_words(rp, ap, np, nl) - carry;
|
|
/*
|
|
* if subtraction result is real, then trick unconditional memcpy
|
|
* below to perform in-place "refresh" instead of actual copy.
|
|
*/
|
|
m = (0 - (size_t)v);
|
|
nrp =
|
|
(BN_ULONG *)(((PTR_SIZE_INT) rp & ~m) | ((PTR_SIZE_INT) ap & m));
|
|
|
|
for (i = 0, nl -= 4; i < nl; 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 (nl += 4; i < nl; i++)
|
|
rp[i] = nrp[i], ap[i] = 0;
|
|
}
|
|
# else
|
|
if (bn_sub_words(rp, ap, np, nl) - carry)
|
|
memcpy(rp, ap, nl * sizeof(BN_ULONG));
|
|
# endif
|
|
bn_correct_top(r);
|
|
bn_correct_top(ret);
|
|
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_clear_free(&(mont->RR));
|
|
BN_clear_free(&(mont->N));
|
|
BN_clear_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;
|
|
|
|
if (BN_is_zero(mod))
|
|
return 0;
|
|
|
|
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)
|
|
{
|
|
BN_MONT_CTX *ret;
|
|
|
|
CRYPTO_r_lock(lock);
|
|
ret = *pmont;
|
|
CRYPTO_r_unlock(lock);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* We don't want to serialise globally while doing our lazy-init math in
|
|
* BN_MONT_CTX_set. That punishes threads that are doing independent
|
|
* things. Instead, punish the case where more than one thread tries to
|
|
* lazy-init the same 'pmont', by having each do the lazy-init math work
|
|
* independently and only use the one from the thread that wins the race
|
|
* (the losers throw away the work they've done).
|
|
*/
|
|
ret = BN_MONT_CTX_new();
|
|
if (!ret)
|
|
return NULL;
|
|
if (!BN_MONT_CTX_set(ret, mod, ctx)) {
|
|
BN_MONT_CTX_free(ret);
|
|
return NULL;
|
|
}
|
|
|
|
/* The locked compare-and-set, after the local work is done. */
|
|
CRYPTO_w_lock(lock);
|
|
if (*pmont) {
|
|
BN_MONT_CTX_free(ret);
|
|
ret = *pmont;
|
|
} else
|
|
*pmont = ret;
|
|
CRYPTO_w_unlock(lock);
|
|
return ret;
|
|
}
|