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 <linux/string.h>
12
13void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
14			      size_t nblocks, const u32 inc);
15
16void blake2s_compress(struct blake2s_state *state, const u8 *block,
17		      size_t nblocks, const u32 inc);
18
19bool blake2s_selftest(void);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
20
21#endif /* _CRYPTO_INTERNAL_BLAKE2S_H */

  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
 14void blake2s_compress_generic(struct blake2s_state *state,const u8 *block,
 15			      size_t nblocks, const u32 inc);
 16
 17void blake2s_compress_arch(struct blake2s_state *state,const u8 *block,
 18			   size_t nblocks, const u32 inc);
 19
 20bool blake2s_selftest(void);
 21
 22static inline void blake2s_set_lastblock(struct blake2s_state *state)
 23{
 24	state->f[0] = -1;
 25}
 26
 27typedef 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
 32static 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
 58static 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
 71struct blake2s_tfm_ctx {
 72	u8 key[BLAKE2S_KEY_SIZE];
 73	unsigned int keylen;
 74};
 75
 76static 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
 90static 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
100static 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
110static 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 */