Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Open Menu / include / crypto / sha1_base.h
Loading...
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
/* 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/crypto.h>
#include <linux/module.h>
#include <linux/string.h>

#include <asm/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(struct shash_desc *desc,
				      const u8 *data,
				      unsigned int len,
				      sha1_block_fn *block_fn)
{
	struct sha1_state *sctx = shash_desc_ctx(desc);
	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;

	sctx->count += len;

	if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) {
		int blocks;

		if (partial) {
			int p = SHA1_BLOCK_SIZE - partial;

			memcpy(sctx->buffer + partial, data, p);
			data += p;
			len -= p;

			block_fn(sctx, sctx->buffer, 1);
		}

		blocks = len / SHA1_BLOCK_SIZE;
		len %= SHA1_BLOCK_SIZE;

		if (blocks) {
			block_fn(sctx, data, blocks);
			data += blocks * SHA1_BLOCK_SIZE;
		}
		partial = 0;
	}
	if (len)
		memcpy(sctx->buffer + partial, data, len);

	return 0;
}

static inline int sha1_base_do_finalize(struct shash_desc *desc,
					sha1_block_fn *block_fn)
{
	const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64);
	struct sha1_state *sctx = shash_desc_ctx(desc);
	__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;

	sctx->buffer[partial++] = 0x80;
	if (partial > bit_offset) {
		memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial);
		partial = 0;

		block_fn(sctx, sctx->buffer, 1);
	}

	memset(sctx->buffer + partial, 0x0, bit_offset - partial);
	*bits = cpu_to_be64(sctx->count << 3);
	block_fn(sctx, sctx->buffer, 1);

	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++);

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

#endif /* _CRYPTO_SHA1_BASE_H */