1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2 /*
3 * Helper functions for BLAKE2b implementations.
4 * Keep this in sync with the corresponding BLAKE2s header.
5 */
6
7 #ifndef _CRYPTO_INTERNAL_BLAKE2B_H
8 #define _CRYPTO_INTERNAL_BLAKE2B_H
9
10 #include <crypto/blake2b.h>
11 #include <crypto/internal/hash.h>
12 #include <linux/string.h>
13
14 void blake2b_compress_generic(struct blake2b_state *state,
15 const u8 *block, size_t nblocks, u32 inc);
16
17 static inline void blake2b_set_lastblock(struct blake2b_state *state)
18 {
19 state->f[0] = -1;
20 }
21
22 typedef void (*blake2b_compress_t)(struct blake2b_state *state,
23 const u8 *block, size_t nblocks, u32 inc);
24
25 static inline void __blake2b_update(struct blake2b_state *state,
26 const u8 *in, size_t inlen,
27 blake2b_compress_t compress)
28 {
29 const size_t fill = BLAKE2B_BLOCK_SIZE - state->buflen;
30
31 if (unlikely(!inlen))
32 return;
33 if (inlen > fill) {
34 memcpy(state->buf + state->buflen, in, fill);
35 (*compress)(state, state->buf, 1, BLAKE2B_BLOCK_SIZE);
36 state->buflen = 0;
37 in += fill;
38 inlen -= fill;
39 }
40 if (inlen > BLAKE2B_BLOCK_SIZE) {
41 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2B_BLOCK_SIZE);
42 /* Hash one less (full) block than strictly possible */
43 (*compress)(state, in, nblocks - 1, BLAKE2B_BLOCK_SIZE);
44 in += BLAKE2B_BLOCK_SIZE * (nblocks - 1);
45 inlen -= BLAKE2B_BLOCK_SIZE * (nblocks - 1);
46 }
47 memcpy(state->buf + state->buflen, in, inlen);
48 state->buflen += inlen;
49 }
50
51 static inline void __blake2b_final(struct blake2b_state *state, u8 *out,
52 blake2b_compress_t compress)
53 {
54 int i;
55
56 blake2b_set_lastblock(state);
57 memset(state->buf + state->buflen, 0,
58 BLAKE2B_BLOCK_SIZE - state->buflen); /* Padding */
59 (*compress)(state, state->buf, 1, state->buflen);
60 for (i = 0; i < ARRAY_SIZE(state->h); i++)
61 __cpu_to_le64s(&state->h[i]);
62 memcpy(out, state->h, state->outlen);
63 }
64
65 /* Helper functions for shash implementations of BLAKE2b */
66
67 struct blake2b_tfm_ctx {
68 u8 key[BLAKE2B_KEY_SIZE];
69 unsigned int keylen;
70 };
71
72 static inline int crypto_blake2b_setkey(struct crypto_shash *tfm,
73 const u8 *key, unsigned int keylen)
74 {
75 struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
76
77 if (keylen == 0 || keylen > BLAKE2B_KEY_SIZE)
78 return -EINVAL;
79
80 memcpy(tctx->key, key, keylen);
81 tctx->keylen = keylen;
82
83 return 0;
84 }
85
86 static inline int crypto_blake2b_init(struct shash_desc *desc)
87 {
88 const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
89 struct blake2b_state *state = shash_desc_ctx(desc);
90 unsigned int outlen = crypto_shash_digestsize(desc->tfm);
91
92 __blake2b_init(state, outlen, tctx->key, tctx->keylen);
93 return 0;
94 }
95
96 static inline int crypto_blake2b_update(struct shash_desc *desc,
97 const u8 *in, unsigned int inlen,
98 blake2b_compress_t compress)
99 {
100 struct blake2b_state *state = shash_desc_ctx(desc);
101
102 __blake2b_update(state, in, inlen, compress);
103 return 0;
104 }
105
106 static inline int crypto_blake2b_final(struct shash_desc *desc, u8 *out,
107 blake2b_compress_t compress)
108 {
109 struct blake2b_state *state = shash_desc_ctx(desc);
110
111 __blake2b_final(state, out, compress);
112 return 0;
113 }
114
115 #endif /* _CRYPTO_INTERNAL_BLAKE2B_H */
116
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