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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* sha1_base.h - core logic for SHA-1 implementations
*
* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
*/
#ifndef _CRYPTO_SHA1_BASE_H
#define _CRYPTO_SHA1_BASE_H
#include <crypto/internal/hash.h>
#include <crypto/sha1.h>
#include <linux/math.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/unaligned.h>
typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks);
static inline int sha1_base_init(struct shash_desc *desc)
{
struct sha1_state *sctx = shash_desc_ctx(desc);
sctx->state[0] = SHA1_H0;
sctx->state[1] = SHA1_H1;
sctx->state[2] = SHA1_H2;
sctx->state[3] = SHA1_H3;
sctx->state[4] = SHA1_H4;
sctx->count = 0;
return 0;
}
static inline int sha1_base_do_update_blocks(struct shash_desc *desc,
const u8 *data,
unsigned int len,
sha1_block_fn *block_fn)
{
unsigned int remain = len - round_down(len, SHA1_BLOCK_SIZE);
struct sha1_state *sctx = shash_desc_ctx(desc);
sctx->count += len - remain;
block_fn(sctx, data, len / SHA1_BLOCK_SIZE);
return remain;
}
static inline int sha1_base_do_finup(struct shash_desc *desc,
const u8 *src, unsigned int len,
sha1_block_fn *block_fn)
{
unsigned int bit_offset = SHA1_BLOCK_SIZE / 8 - 1;
struct sha1_state *sctx = shash_desc_ctx(desc);
union {
__be64 b64[SHA1_BLOCK_SIZE / 4];
u8 u8[SHA1_BLOCK_SIZE * 2];
} block = {};
if (len >= bit_offset * 8)
bit_offset += SHA1_BLOCK_SIZE / 8;
memcpy(&block, src, len);
block.u8[len] = 0x80;
sctx->count += len;
block.b64[bit_offset] = cpu_to_be64(sctx->count << 3);
block_fn(sctx, block.u8, (bit_offset + 1) * 8 / SHA1_BLOCK_SIZE);
memzero_explicit(&block, sizeof(block));
return 0;
}
static inline int sha1_base_finish(struct shash_desc *desc, u8 *out)
{
struct sha1_state *sctx = shash_desc_ctx(desc);
__be32 *digest = (__be32 *)out;
int i;
for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
put_unaligned_be32(sctx->state[i], digest++);
return 0;
}
#endif /* _CRYPTO_SHA1_BASE_H */
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