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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* sha512_base.h - core logic for SHA-512 implementations
*
* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
*/
#ifndef _CRYPTO_SHA512_BASE_H
#define _CRYPTO_SHA512_BASE_H
#include <crypto/internal/hash.h>
#include <crypto/sha2.h>
#include <linux/compiler.h>
#include <linux/math.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/unaligned.h>
typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
int blocks);
static inline int sha384_base_init(struct shash_desc *desc)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
sctx->state[0] = SHA384_H0;
sctx->state[1] = SHA384_H1;
sctx->state[2] = SHA384_H2;
sctx->state[3] = SHA384_H3;
sctx->state[4] = SHA384_H4;
sctx->state[5] = SHA384_H5;
sctx->state[6] = SHA384_H6;
sctx->state[7] = SHA384_H7;
sctx->count[0] = sctx->count[1] = 0;
return 0;
}
static inline int sha512_base_init(struct shash_desc *desc)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
sctx->state[0] = SHA512_H0;
sctx->state[1] = SHA512_H1;
sctx->state[2] = SHA512_H2;
sctx->state[3] = SHA512_H3;
sctx->state[4] = SHA512_H4;
sctx->state[5] = SHA512_H5;
sctx->state[6] = SHA512_H6;
sctx->state[7] = SHA512_H7;
sctx->count[0] = sctx->count[1] = 0;
return 0;
}
static inline int sha512_base_do_update_blocks(struct shash_desc *desc,
const u8 *data,
unsigned int len,
sha512_block_fn *block_fn)
{
unsigned int remain = len - round_down(len, SHA512_BLOCK_SIZE);
struct sha512_state *sctx = shash_desc_ctx(desc);
len -= remain;
sctx->count[0] += len;
if (sctx->count[0] < len)
sctx->count[1]++;
block_fn(sctx, data, len / SHA512_BLOCK_SIZE);
return remain;
}
static inline int sha512_base_do_finup(struct shash_desc *desc, const u8 *src,
unsigned int len,
sha512_block_fn *block_fn)
{
unsigned int bit_offset = SHA512_BLOCK_SIZE / 8 - 2;
struct sha512_state *sctx = shash_desc_ctx(desc);
union {
__be64 b64[SHA512_BLOCK_SIZE / 4];
u8 u8[SHA512_BLOCK_SIZE * 2];
} block = {};
if (len >= SHA512_BLOCK_SIZE) {
int remain;
remain = sha512_base_do_update_blocks(desc, src, len, block_fn);
src += len - remain;
len = remain;
}
if (len >= bit_offset * 8)
bit_offset += SHA512_BLOCK_SIZE / 8;
memcpy(&block, src, len);
block.u8[len] = 0x80;
sctx->count[0] += len;
block.b64[bit_offset] = cpu_to_be64(sctx->count[1] << 3 |
sctx->count[0] >> 61);
block.b64[bit_offset + 1] = cpu_to_be64(sctx->count[0] << 3);
block_fn(sctx, block.u8, (bit_offset + 2) * 8 / SHA512_BLOCK_SIZE);
memzero_explicit(&block, sizeof(block));
return 0;
}
static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)
{
unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
struct sha512_state *sctx = shash_desc_ctx(desc);
__be64 *digest = (__be64 *)out;
int i;
for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))
put_unaligned_be64(sctx->state[i], digest++);
return 0;
}
void sha512_generic_block_fn(struct sha512_state *sst, u8 const *src,
int blocks);
#endif /* _CRYPTO_SHA512_BASE_H */
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