mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-27 06:12:15 +00:00
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
|
/* Based on linux source code */
|
||
|
|
/*
|
||
|
|
* sha256_base.h - core logic for SHA-256 implementations
|
||
|
|
*
|
||
|
|
* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
#include "sha256.h"
|
||
|
|
|
||
|
|
#define unlikely(x) __builtin_expect(!!(x), 0)
|
||
|
|
|
||
|
|
void sha256_block_data_order (uint32_t *ctx, const void *in, size_t num);
|
||
|
|
|
||
|
|
int sha256_init(struct sha256_state *sctx)
|
||
|
|
{
|
||
|
|
sctx->state[0] = SHA256_H0;
|
||
|
|
sctx->state[1] = SHA256_H1;
|
||
|
|
sctx->state[2] = SHA256_H2;
|
||
|
|
sctx->state[3] = SHA256_H3;
|
||
|
|
sctx->state[4] = SHA256_H4;
|
||
|
|
sctx->state[5] = SHA256_H5;
|
||
|
|
sctx->state[6] = SHA256_H6;
|
||
|
|
sctx->state[7] = SHA256_H7;
|
||
|
|
sctx->count = 0;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256_update(struct sha256_state *sctx,
|
||
|
|
const void *data,
|
||
|
|
size_t len)
|
||
|
|
{
|
||
|
|
const u8 *data8 = (const u8 *)data;
|
||
|
|
unsigned int len32 = (unsigned int)len;
|
||
|
|
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
|
||
|
|
|
||
|
|
sctx->count += len32;
|
||
|
|
|
||
|
|
if (unlikely((partial + len32) >= SHA256_BLOCK_SIZE)) {
|
||
|
|
int blocks;
|
||
|
|
|
||
|
|
if (partial) {
|
||
|
|
int p = SHA256_BLOCK_SIZE - partial;
|
||
|
|
|
||
|
|
memcpy(sctx->buf + partial, data8, p);
|
||
|
|
data8 += p;
|
||
|
|
len32 -= p;
|
||
|
|
|
||
|
|
sha256_block_data_order(sctx->state, sctx->buf, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
blocks = len32 / SHA256_BLOCK_SIZE;
|
||
|
|
len32 %= SHA256_BLOCK_SIZE;
|
||
|
|
|
||
|
|
if (blocks) {
|
||
|
|
sha256_block_data_order(sctx->state, data8, blocks);
|
||
|
|
data8 += blocks * SHA256_BLOCK_SIZE;
|
||
|
|
}
|
||
|
|
partial = 0;
|
||
|
|
}
|
||
|
|
if (len32)
|
||
|
|
memcpy(sctx->buf + partial, data8, len32);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256_finalize(struct sha256_state *sctx)
|
||
|
|
{
|
||
|
|
const int bit_offset = SHA256_BLOCK_SIZE - sizeof(u64);
|
||
|
|
u64 *bits = (u64 *)(sctx->buf + bit_offset);
|
||
|
|
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
|
||
|
|
|
||
|
|
sctx->buf[partial++] = 0x80;
|
||
|
|
if (partial > bit_offset) {
|
||
|
|
memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial);
|
||
|
|
partial = 0;
|
||
|
|
|
||
|
|
sha256_block_data_order(sctx->state, sctx->buf, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
memset(sctx->buf + partial, 0x0, bit_offset - partial);
|
||
|
|
*bits = __builtin_bswap64(sctx->count << 3);
|
||
|
|
sha256_block_data_order(sctx->state, sctx->buf, 1);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256_finish(struct sha256_state *sctx, void *out)
|
||
|
|
{
|
||
|
|
unsigned int digest_size = 32;
|
||
|
|
u32 *digest = (u32 *)out;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
// Switch: misalignment shouldn't be a problem here...
|
||
|
|
for (i = 0; digest_size > 0; i++, digest_size -= sizeof(u32))
|
||
|
|
*digest++ = __builtin_bswap32(sctx->state[i]);
|
||
|
|
|
||
|
|
*sctx = (struct sha256_state){};
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|