mirror of
https://github.com/zoogie/TADPole-3DS.git
synced 2025-06-18 19:25:32 -04:00
137 lines
2.3 KiB
C++
137 lines
2.3 KiB
C++
// Copyright 2007,2008 Segher Boessenkool <segher@kernel.crashing.org>
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// Licensed under the terms of the GNU GPL, version 2
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// http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
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// obtained from http://git.infradead.org/?p=users/segher/wii.git
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#include <3ds.h>
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#include <string.h>
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#include <stdio.h>
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#if 0
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static void bn_print(char *name, u8 *a, u32 n)
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{
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u32 i;
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printf("%s = ", name);
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for (i = 0; i < n; i++)
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printf("%02x", a[i]);
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printf("\n");
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}
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#endif
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static void bn_zero(u8 *d, u32 n)
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{
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memset(d, 0, n);
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}
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static void bn_copy(u8 *d, u8 *a, u32 n)
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{
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memcpy(d, a, n);
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}
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int bn_compare(u8 *a, u8 *b, u32 n)
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{
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u32 i;
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for (i = 0; i < n; i++) {
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if (a[i] < b[i])
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return -1;
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if (a[i] > b[i])
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return 1;
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}
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return 0;
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}
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void bn_sub_modulus(u8 *a, u8 *N, u32 n)
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{
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u32 i;
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u32 dig;
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u8 c;
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c = 0;
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for (i = n - 1; i < n; i--) {
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dig = N[i] + c;
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c = (a[i] < dig);
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a[i] -= dig;
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}
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}
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void bn_add(u8 *d, u8 *a, u8 *b, u8 *N, u32 n)
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{
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u32 i;
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u32 dig;
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u8 c;
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c = 0;
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for (i = n - 1; i < n; i--) {
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dig = a[i] + b[i] + c;
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c = (dig >= 0x100);
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d[i] = dig;
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}
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if (c)
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bn_sub_modulus(d, N, n);
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if (bn_compare(d, N, n) >= 0)
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bn_sub_modulus(d, N, n);
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}
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void bn_mul(u8 *d, u8 *a, u8 *b, u8 *N, u32 n)
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{
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u32 i;
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u8 mask;
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bn_zero(d, n);
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for (i = 0; i < n; i++)
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for (mask = 0x80; mask != 0; mask >>= 1) {
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bn_add(d, d, d, N, n);
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if ((a[i] & mask) != 0)
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bn_add(d, d, b, N, n);
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}
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}
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void bn_exp(u8 *d, u8 *a, u8 *N, u32 n, u8 *e, u32 en)
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{
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u8 t[512];
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u32 i;
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u8 mask;
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bn_zero(d, n);
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d[n-1] = 1;
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for (i = 0; i < en; i++)
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for (mask = 0x80; mask != 0; mask >>= 1) {
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bn_mul(t, d, d, N, n);
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if ((e[i] & mask) != 0)
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bn_mul(d, t, a, N, n);
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else
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bn_copy(d, t, n);
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}
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}
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// only for prime N -- stupid but lazy, see if I care
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void bn_inv(u8 *d, u8 *a, u8 *N, u32 n)
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{
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u8 t[512], s[512];
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bn_copy(t, N, n);
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bn_zero(s, n);
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s[n-1] = 2;
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bn_sub_modulus(t, s, n);
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bn_exp(d, a, N, n, t, n);
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}
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void bn_shiftr(u8 *in, u32 size, u32 shiftn){ //this is to help convert sha1 ecdsa to sha256. this curve is limited to 233 bits so the 256 bit hash needs to be shifted right 23 bits.
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u8 carry=0;
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u8 temp=0;
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for(u32 j=0;j<shiftn;j++){
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for(u32 i=0;i<size;i++){
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temp=*(in+i) & 1;
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*(in+i)=(*(in+i) >> 1 ) | carry<<7;
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carry=temp;
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}
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carry=0; temp=0;
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}
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} |