mirror of
https://github.com/openssl/openssl.git
synced 2024-12-14 04:24:23 +08:00
706457b7bd
Apart from public and internal header files, there is a third type called local header files, which are located next to source files in the source directory. Currently, they have different suffixes like '*_lcl.h', '*_local.h', or '*_int.h' This commit changes the different suffixes to '*_local.h' uniformly. Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/9333)
172 lines
3.3 KiB
C
172 lines
3.3 KiB
C
/*
|
|
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#include "internal/cryptlib.h"
|
|
#include "bn_local.h"
|
|
|
|
/* signed add of b to a. */
|
|
int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
|
|
{
|
|
int ret, r_neg, cmp_res;
|
|
|
|
bn_check_top(a);
|
|
bn_check_top(b);
|
|
|
|
if (a->neg == b->neg) {
|
|
r_neg = a->neg;
|
|
ret = BN_uadd(r, a, b);
|
|
} else {
|
|
cmp_res = BN_ucmp(a, b);
|
|
if (cmp_res > 0) {
|
|
r_neg = a->neg;
|
|
ret = BN_usub(r, a, b);
|
|
} else if (cmp_res < 0) {
|
|
r_neg = b->neg;
|
|
ret = BN_usub(r, b, a);
|
|
} else {
|
|
r_neg = 0;
|
|
BN_zero(r);
|
|
ret = 1;
|
|
}
|
|
}
|
|
|
|
r->neg = r_neg;
|
|
bn_check_top(r);
|
|
return ret;
|
|
}
|
|
|
|
/* signed sub of b from a. */
|
|
int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
|
|
{
|
|
int ret, r_neg, cmp_res;
|
|
|
|
bn_check_top(a);
|
|
bn_check_top(b);
|
|
|
|
if (a->neg != b->neg) {
|
|
r_neg = a->neg;
|
|
ret = BN_uadd(r, a, b);
|
|
} else {
|
|
cmp_res = BN_ucmp(a, b);
|
|
if (cmp_res > 0) {
|
|
r_neg = a->neg;
|
|
ret = BN_usub(r, a, b);
|
|
} else if (cmp_res < 0) {
|
|
r_neg = !b->neg;
|
|
ret = BN_usub(r, b, a);
|
|
} else {
|
|
r_neg = 0;
|
|
BN_zero(r);
|
|
ret = 1;
|
|
}
|
|
}
|
|
|
|
r->neg = r_neg;
|
|
bn_check_top(r);
|
|
return ret;
|
|
}
|
|
|
|
/* unsigned add of b to a, r can be equal to a or b. */
|
|
int BN_uadd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
|
|
{
|
|
int max, min, dif;
|
|
const BN_ULONG *ap, *bp;
|
|
BN_ULONG *rp, carry, t1, t2;
|
|
|
|
bn_check_top(a);
|
|
bn_check_top(b);
|
|
|
|
if (a->top < b->top) {
|
|
const BIGNUM *tmp;
|
|
|
|
tmp = a;
|
|
a = b;
|
|
b = tmp;
|
|
}
|
|
max = a->top;
|
|
min = b->top;
|
|
dif = max - min;
|
|
|
|
if (bn_wexpand(r, max + 1) == NULL)
|
|
return 0;
|
|
|
|
r->top = max;
|
|
|
|
ap = a->d;
|
|
bp = b->d;
|
|
rp = r->d;
|
|
|
|
carry = bn_add_words(rp, ap, bp, min);
|
|
rp += min;
|
|
ap += min;
|
|
|
|
while (dif) {
|
|
dif--;
|
|
t1 = *(ap++);
|
|
t2 = (t1 + carry) & BN_MASK2;
|
|
*(rp++) = t2;
|
|
carry &= (t2 == 0);
|
|
}
|
|
*rp = carry;
|
|
r->top += carry;
|
|
|
|
r->neg = 0;
|
|
bn_check_top(r);
|
|
return 1;
|
|
}
|
|
|
|
/* unsigned subtraction of b from a, a must be larger than b. */
|
|
int BN_usub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
|
|
{
|
|
int max, min, dif;
|
|
BN_ULONG t1, t2, borrow, *rp;
|
|
const BN_ULONG *ap, *bp;
|
|
|
|
bn_check_top(a);
|
|
bn_check_top(b);
|
|
|
|
max = a->top;
|
|
min = b->top;
|
|
dif = max - min;
|
|
|
|
if (dif < 0) { /* hmm... should not be happening */
|
|
BNerr(BN_F_BN_USUB, BN_R_ARG2_LT_ARG3);
|
|
return 0;
|
|
}
|
|
|
|
if (bn_wexpand(r, max) == NULL)
|
|
return 0;
|
|
|
|
ap = a->d;
|
|
bp = b->d;
|
|
rp = r->d;
|
|
|
|
borrow = bn_sub_words(rp, ap, bp, min);
|
|
ap += min;
|
|
rp += min;
|
|
|
|
while (dif) {
|
|
dif--;
|
|
t1 = *(ap++);
|
|
t2 = (t1 - borrow) & BN_MASK2;
|
|
*(rp++) = t2;
|
|
borrow &= (t1 == 0);
|
|
}
|
|
|
|
while (max && *--rp == 0)
|
|
max--;
|
|
|
|
r->top = max;
|
|
r->neg = 0;
|
|
bn_pollute(r);
|
|
|
|
return 1;
|
|
}
|
|
|