1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * sha1_base.h - core logic for SHA-1 implementations
5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
8 #include <crypto/internal/hash.h>
9 #include <crypto/sha.h>
10 #include <linux/crypto.h>
11 #include <linux/module.h>
13 #include <asm/unaligned.h>
15 typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks);
17 static inline int sha1_base_init(struct shash_desc *desc)
19 struct sha1_state *sctx = shash_desc_ctx(desc);
21 sctx->state[0] = SHA1_H0;
22 sctx->state[1] = SHA1_H1;
23 sctx->state[2] = SHA1_H2;
24 sctx->state[3] = SHA1_H3;
25 sctx->state[4] = SHA1_H4;
31 static inline int sha1_base_do_update(struct shash_desc *desc,
34 sha1_block_fn *block_fn)
36 struct sha1_state *sctx = shash_desc_ctx(desc);
37 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
41 if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) {
45 int p = SHA1_BLOCK_SIZE - partial;
47 memcpy(sctx->buffer + partial, data, p);
51 block_fn(sctx, sctx->buffer, 1);
54 blocks = len / SHA1_BLOCK_SIZE;
55 len %= SHA1_BLOCK_SIZE;
58 block_fn(sctx, data, blocks);
59 data += blocks * SHA1_BLOCK_SIZE;
64 memcpy(sctx->buffer + partial, data, len);
69 static inline int sha1_base_do_finalize(struct shash_desc *desc,
70 sha1_block_fn *block_fn)
72 const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64);
73 struct sha1_state *sctx = shash_desc_ctx(desc);
74 __be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
75 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
77 sctx->buffer[partial++] = 0x80;
78 if (partial > bit_offset) {
79 memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial);
82 block_fn(sctx, sctx->buffer, 1);
85 memset(sctx->buffer + partial, 0x0, bit_offset - partial);
86 *bits = cpu_to_be64(sctx->count << 3);
87 block_fn(sctx, sctx->buffer, 1);
92 static inline int sha1_base_finish(struct shash_desc *desc, u8 *out)
94 struct sha1_state *sctx = shash_desc_ctx(desc);
95 __be32 *digest = (__be32 *)out;
98 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
99 put_unaligned_be32(sctx->state[i], digest++);
101 *sctx = (struct sha1_state){};