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