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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* sha256_base.h - core logic for SHA-256 implementations
*
* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
* Copyright 2022 NXP
*/
#ifndef _CRYPTO_SHA256_BASE_H
#define _CRYPTO_SHA256_BASE_H
#include <asm/unaligned.h>
#include <linux/string.h>
#include <compiler.h>
#include <crypto/sha2.h>
typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,
int blocks);
static inline void sha256_base_do_update(struct sha256_state *sctx,
const u8 *data,
unsigned int len,
sha256_block_fn *block_fn)
{
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
sctx->count += len;
if ((partial + len) >= SHA256_BLOCK_SIZE) {
int blocks;
if (partial) {
int p = SHA256_BLOCK_SIZE - partial;
memcpy(sctx->buf + partial, data, p);
data += p;
len -= p;
block_fn(sctx, sctx->buf, 1);
}
blocks = len / SHA256_BLOCK_SIZE;
len %= SHA256_BLOCK_SIZE;
if (blocks) {
block_fn(sctx, data, blocks);
data += blocks * SHA256_BLOCK_SIZE;
}
partial = 0;
}
if (len)
memcpy(sctx->buf + partial, data, len);
}
static inline void sha256_base_do_finalize(struct sha256_state *sctx,
sha256_block_fn *block_fn)
{
const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);
__be64 *bits = (__be64 *)(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;
block_fn(sctx, sctx->buf, 1);
}
memset(sctx->buf + partial, 0x0, bit_offset - partial);
*bits = cpu_to_be64(sctx->count << 3);
block_fn(sctx, sctx->buf, 1);
}
static inline void sha256_base_finish(struct sha256_state *sctx, u8 *out)
{
unsigned int digest_size = SHA256_DIGEST_SIZE;
__be32 *digest = (__be32 *)out;
int i;
for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))
put_unaligned_be32(sctx->state[i], digest++);
memset(sctx, 0x0, sizeof(*sctx));
}
#endif /* _CRYPTO_SHA256_BASE_H */
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