124 lines
1.9 KiB
C++
124 lines
1.9 KiB
C++
// Copyright 2007,2008 Segher Boessenkool <segher@kernel.crashing.org>
|
|
// Licensed under the terms of the GNU GPL, version 2
|
|
// http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include "../Common.h"
|
|
#include "tools.h"
|
|
|
|
/*static void bn_print(char *name, u8 *a, u32 n)
|
|
{
|
|
u32 i;
|
|
|
|
printf("%s = ", name);
|
|
|
|
for (i = 0; i < n; i++)
|
|
printf("%02x", a[i]);
|
|
|
|
printf("\n");
|
|
}*/
|
|
|
|
static void bn_zero(u8 *d, u32 n)
|
|
{
|
|
memset(d, 0, n);
|
|
}
|
|
|
|
static void bn_copy(u8 *d, u8 *a, u32 n)
|
|
{
|
|
memcpy(d, a, n);
|
|
}
|
|
|
|
int bn_compare(u8 *a, u8 *b, u32 n)
|
|
{
|
|
u32 i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
if (a[i] < b[i])
|
|
return -1;
|
|
if (a[i] > b[i])
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bn_sub_modulus(u8 *a, u8 *N, u32 n)
|
|
{
|
|
u32 i;
|
|
u32 dig;
|
|
u8 c;
|
|
|
|
c = 0;
|
|
for (i = n - 1; i < n; i--) {
|
|
dig = N[i] + c;
|
|
c = (a[i] < dig);
|
|
a[i] -= dig;
|
|
}
|
|
}
|
|
|
|
void bn_add(u8 *d, u8 *a, u8 *b, u8 *N, u32 n)
|
|
{
|
|
u32 i;
|
|
u32 dig;
|
|
u8 c;
|
|
|
|
c = 0;
|
|
for (i = n - 1; i < n; i--) {
|
|
dig = a[i] + b[i] + c;
|
|
c = (dig >= 0x100);
|
|
d[i] = dig;
|
|
}
|
|
|
|
if (c)
|
|
bn_sub_modulus(d, N, n);
|
|
|
|
if (bn_compare(d, N, n) >= 0)
|
|
bn_sub_modulus(d, N, n);
|
|
}
|
|
|
|
void bn_mul(u8 *d, u8 *a, u8 *b, u8 *N, u32 n)
|
|
{
|
|
u32 i;
|
|
u8 mask;
|
|
|
|
bn_zero(d, n);
|
|
|
|
for (i = 0; i < n; i++)
|
|
for (mask = 0x80; mask != 0; mask >>= 1) {
|
|
bn_add(d, d, d, N, n);
|
|
if ((a[i] & mask) != 0)
|
|
bn_add(d, d, b, N, n);
|
|
}
|
|
}
|
|
|
|
void bn_exp(u8 *d, u8 *a, u8 *N, u32 n, u8 *e, u32 en)
|
|
{
|
|
u8 t[512];
|
|
u32 i;
|
|
u8 mask;
|
|
|
|
bn_zero(d, n);
|
|
d[n-1] = 1;
|
|
for (i = 0; i < en; i++)
|
|
for (mask = 0x80; mask != 0; mask >>= 1) {
|
|
bn_mul(t, d, d, N, n);
|
|
if ((e[i] & mask) != 0)
|
|
bn_mul(d, t, a, N, n);
|
|
else
|
|
bn_copy(d, t, n);
|
|
}
|
|
}
|
|
|
|
// only for prime N -- stupid but lazy, see if I care
|
|
void bn_inv(u8 *d, u8 *a, u8 *N, u32 n)
|
|
{
|
|
u8 t[512], s[512];
|
|
|
|
bn_copy(t, N, n);
|
|
bn_zero(s, n);
|
|
s[n-1] = 2;
|
|
bn_sub_modulus(t, s, n);
|
|
bn_exp(d, a, N, n, t, n);
|
|
}
|