1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * sm3_base.h - core logic for SM3 implementations
4 *
5 * Copyright (C) 2017 ARM Limited or its affiliates.
6 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
7 */
8
9#ifndef _CRYPTO_SM3_BASE_H
10#define _CRYPTO_SM3_BASE_H
11
12#include <crypto/internal/hash.h>
13#include <crypto/sm3.h>
14#include <linux/math.h>
15#include <linux/module.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/unaligned.h>
19
20typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
21
22static inline int sm3_base_init(struct shash_desc *desc)
23{
24 sm3_init(sctx: shash_desc_ctx(desc));
25 return 0;
26}
27
28static inline int sm3_base_do_update_blocks(struct shash_desc *desc,
29 const u8 *data, unsigned int len,
30 sm3_block_fn *block_fn)
31{
32 unsigned int remain = len - round_down(len, SM3_BLOCK_SIZE);
33 struct sm3_state *sctx = shash_desc_ctx(desc);
34
35 sctx->count += len - remain;
36 block_fn(sctx, data, len / SM3_BLOCK_SIZE);
37 return remain;
38}
39
40static inline int sm3_base_do_finup(struct shash_desc *desc,
41 const u8 *src, unsigned int len,
42 sm3_block_fn *block_fn)
43{
44 unsigned int bit_offset = SM3_BLOCK_SIZE / 8 - 1;
45 struct sm3_state *sctx = shash_desc_ctx(desc);
46 union {
47 __be64 b64[SM3_BLOCK_SIZE / 4];
48 u8 u8[SM3_BLOCK_SIZE * 2];
49 } block = {};
50
51 if (len >= SM3_BLOCK_SIZE) {
52 int remain;
53
54 remain = sm3_base_do_update_blocks(desc, data: src, len, block_fn);
55 src += len - remain;
56 len = remain;
57 }
58
59 if (len >= bit_offset * 8)
60 bit_offset += SM3_BLOCK_SIZE / 8;
61 memcpy(&block, src, len);
62 block.u8[len] = 0x80;
63 sctx->count += len;
64 block.b64[bit_offset] = cpu_to_be64(sctx->count << 3);
65 block_fn(sctx, block.u8, (bit_offset + 1) * 8 / SM3_BLOCK_SIZE);
66 memzero_explicit(s: &block, count: sizeof(block));
67
68 return 0;
69}
70
71static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
72{
73 struct sm3_state *sctx = shash_desc_ctx(desc);
74 __be32 *digest = (__be32 *)out;
75 int i;
76
77 for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
78 put_unaligned_be32(val: sctx->state[i], p: digest++);
79 return 0;
80}
81
82#endif /* _CRYPTO_SM3_BASE_H */
83

source code of linux/include/crypto/sm3_base.h