[mirror_ubuntu-hirsute-kernel.git] / include / crypto / sha256_base.h

/* 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>
 */

#ifndef _CRYPTO_SHA256_BASE_H
#define _CRYPTO_SHA256_BASE_H

#include <crypto/internal/hash.h>
#include <crypto/sha2.h>
#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/string.h>

#include <asm/unaligned.h>

typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,
			       int blocks);

static inline int sha224_base_init(struct shash_desc *desc)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	sha224_init(sctx);
	return 0;
}

static inline int sha256_base_init(struct shash_desc *desc)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	sha256_init(sctx);
	return 0;
}

static inline int sha256_base_do_update(struct shash_desc *desc,
					const u8 *data,
					unsigned int len,
					sha256_block_fn *block_fn)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;

	sctx->count += len;

	if (unlikely((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);

	return 0;
}

static inline int sha256_base_do_finalize(struct shash_desc *desc,
					  sha256_block_fn *block_fn)
{
	const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);
	struct sha256_state *sctx = shash_desc_ctx(desc);
	__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);

	return 0;
}

static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
{
	unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
	struct sha256_state *sctx = shash_desc_ctx(desc);
	__be32 *digest = (__be32 *)out;
	int i;

	for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))
		put_unaligned_be32(sctx->state[i], digest++);

	memzero_explicit(sctx, sizeof(*sctx));
	return 0;
}

#endif /* _CRYPTO_SHA256_BASE_H */
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
11b8d5ef AB	2	/*
	3	* sha256_base.h - core logic for SHA-256 implementations
	4	*
	5	* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
11b8d5ef AB	6	*/
11b8d5ef AB	7
68289c63 MY	8	#ifndef _CRYPTO_SHA256_BASE_H
	9	#define _CRYPTO_SHA256_BASE_H
	10
11b8d5ef	11	#include <crypto/internal/hash.h>
a24d22b2	12	#include <crypto/sha2.h>
11b8d5ef AB	13	#include <linux/crypto.h>
11b8d5ef AB	14	#include <linux/module.h>
458c0480	15	#include <linux/string.h>
11b8d5ef AB	16
	17	#include <asm/unaligned.h>
	18
	19	typedef void (sha256_block_fn)(struct sha256_state sst, u8 const src,
	20	int blocks);
	21
	22	static inline int sha224_base_init(struct shash_desc *desc)
	23	{
	24	struct sha256_state *sctx = shash_desc_ctx(desc);
	25
13855fd8 EB	26	sha224_init(sctx);
13855fd8 EB	27	return 0;
11b8d5ef AB	28	}
	29
	30	static inline int sha256_base_init(struct shash_desc *desc)
	31	{
	32	struct sha256_state *sctx = shash_desc_ctx(desc);
	33
13855fd8 EB	34	sha256_init(sctx);
13855fd8 EB	35	return 0;
11b8d5ef AB	36	}
	37
	38	static inline int sha256_base_do_update(struct shash_desc *desc,
	39	const u8 *data,
	40	unsigned int len,
	41	sha256_block_fn *block_fn)
	42	{
	43	struct sha256_state *sctx = shash_desc_ctx(desc);
	44	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
	45
	46	sctx->count += len;
	47
	48	if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {
	49	int blocks;
	50
	51	if (partial) {
	52	int p = SHA256_BLOCK_SIZE - partial;
	53
	54	memcpy(sctx->buf + partial, data, p);
	55	data += p;
	56	len -= p;
	57
	58	block_fn(sctx, sctx->buf, 1);
	59	}
	60
	61	blocks = len / SHA256_BLOCK_SIZE;
	62	len %= SHA256_BLOCK_SIZE;
	63
	64	if (blocks) {
	65	block_fn(sctx, data, blocks);
	66	data += blocks * SHA256_BLOCK_SIZE;
	67	}
	68	partial = 0;
	69	}
	70	if (len)
	71	memcpy(sctx->buf + partial, data, len);
	72
	73	return 0;
	74	}
	75
	76	static inline int sha256_base_do_finalize(struct shash_desc *desc,
	77	sha256_block_fn *block_fn)
	78	{
	79	const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);
	80	struct sha256_state *sctx = shash_desc_ctx(desc);
	81	__be64 bits = (__be64 )(sctx->buf + bit_offset);
	82	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
	83
	84	sctx->buf[partial++] = 0x80;
	85	if (partial > bit_offset) {
	86	memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial);
	87	partial = 0;
	88
	89	block_fn(sctx, sctx->buf, 1);
	90	}
	91
	92	memset(sctx->buf + partial, 0x0, bit_offset - partial);
	93	*bits = cpu_to_be64(sctx->count << 3);
	94	block_fn(sctx, sctx->buf, 1);
	95
	96	return 0;
	97	}
	98
	99	static inline int sha256_base_finish(struct shash_desc desc, u8 out)
100	{
101	unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
102	struct sha256_state *sctx = shash_desc_ctx(desc);
103	__be32 digest = (__be32 )out;
104	int i;
105
106	for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))
107	put_unaligned_be32(sctx->state[i], digest++);
108
458c0480	109	memzero_explicit(sctx, sizeof(*sctx));
11b8d5ef AB	110	return 0;
11b8d5ef AB	111	}
68289c63 MY	112
68289c63 MY	113	#endif /* _CRYPTO_SHA256_BASE_H */