1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2 /*
3 * Helper functions for BLAKE2s implementations.
4 * Keep this in sync with the corresponding BLAKE2b header.
5 */
6
7 #ifndef _CRYPTO_INTERNAL_BLAKE2S_H
8 #define _CRYPTO_INTERNAL_BLAKE2S_H
9
10 #include <crypto/blake2s.h>
11 #include <crypto/internal/hash.h>
12 #include <linux/string.h>
13
14 void blake2s_compress_generic(struct blake2s_state *state,const u8 *block,
15 size_t nblocks, const u32 inc);
16
17 void blake2s_compress_arch(struct blake2s_state *state,const u8 *block,
18 size_t nblocks, const u32 inc);
19
20 bool blake2s_selftest(void);
21
blake2s_set_lastblock(struct blake2s_state * state)22 static inline void blake2s_set_lastblock(struct blake2s_state *state)
23 {
24 state->f[0] = -1;
25 }
26
27 typedef void (*blake2s_compress_t)(struct blake2s_state *state,
28 const u8 *block, size_t nblocks, u32 inc);
29
30 /* Helper functions for BLAKE2s shared by the library and shash APIs */
31
__blake2s_update(struct blake2s_state * state,const u8 * in,size_t inlen,blake2s_compress_t compress)32 static inline void __blake2s_update(struct blake2s_state *state,
33 const u8 *in, size_t inlen,
34 blake2s_compress_t compress)
35 {
36 const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
37
38 if (unlikely(!inlen))
39 return;
40 if (inlen > fill) {
41 memcpy(state->buf + state->buflen, in, fill);
42 (*compress)(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
43 state->buflen = 0;
44 in += fill;
45 inlen -= fill;
46 }
47 if (inlen > BLAKE2S_BLOCK_SIZE) {
48 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
49 /* Hash one less (full) block than strictly possible */
50 (*compress)(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
51 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
52 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
53 }
54 memcpy(state->buf + state->buflen, in, inlen);
55 state->buflen += inlen;
56 }
57
__blake2s_final(struct blake2s_state * state,u8 * out,blake2s_compress_t compress)58 static inline void __blake2s_final(struct blake2s_state *state, u8 *out,
59 blake2s_compress_t compress)
60 {
61 blake2s_set_lastblock(state);
62 memset(state->buf + state->buflen, 0,
63 BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
64 (*compress)(state, state->buf, 1, state->buflen);
65 cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
66 memcpy(out, state->h, state->outlen);
67 }
68
69 /* Helper functions for shash implementations of BLAKE2s */
70
71 struct blake2s_tfm_ctx {
72 u8 key[BLAKE2S_KEY_SIZE];
73 unsigned int keylen;
74 };
75
crypto_blake2s_setkey(struct crypto_shash * tfm,const u8 * key,unsigned int keylen)76 static inline int crypto_blake2s_setkey(struct crypto_shash *tfm,
77 const u8 *key, unsigned int keylen)
78 {
79 struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
80
81 if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE)
82 return -EINVAL;
83
84 memcpy(tctx->key, key, keylen);
85 tctx->keylen = keylen;
86
87 return 0;
88 }
89
crypto_blake2s_init(struct shash_desc * desc)90 static inline int crypto_blake2s_init(struct shash_desc *desc)
91 {
92 const struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
93 struct blake2s_state *state = shash_desc_ctx(desc);
94 unsigned int outlen = crypto_shash_digestsize(desc->tfm);
95
96 __blake2s_init(state, outlen, tctx->key, tctx->keylen);
97 return 0;
98 }
99
crypto_blake2s_update(struct shash_desc * desc,const u8 * in,unsigned int inlen,blake2s_compress_t compress)100 static inline int crypto_blake2s_update(struct shash_desc *desc,
101 const u8 *in, unsigned int inlen,
102 blake2s_compress_t compress)
103 {
104 struct blake2s_state *state = shash_desc_ctx(desc);
105
106 __blake2s_update(state, in, inlen, compress);
107 return 0;
108 }
109
crypto_blake2s_final(struct shash_desc * desc,u8 * out,blake2s_compress_t compress)110 static inline int crypto_blake2s_final(struct shash_desc *desc, u8 *out,
111 blake2s_compress_t compress)
112 {
113 struct blake2s_state *state = shash_desc_ctx(desc);
114
115 __blake2s_final(state, out, compress);
116 return 0;
117 }
118
119 #endif /* _CRYPTO_INTERNAL_BLAKE2S_H */
120