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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Common values for the Poly1305 algorithm
4 */
5
6#ifndef _CRYPTO_INTERNAL_POLY1305_H
7#define _CRYPTO_INTERNAL_POLY1305_H
8
9#include <crypto/poly1305.h>
10#include <linux/types.h>
11
12/*
13 * Poly1305 core functions. These only accept whole blocks; the caller must
14 * handle any needed block buffering and padding. 'hibit' must be 1 for any
15 * full blocks, or 0 for the final block if it had to be padded. If 'nonce' is
16 * non-NULL, then it's added at the end to compute the Poly1305 MAC. Otherwise,
17 * only the ε-almost-∆-universal hash function (not the full MAC) is computed.
18 */
19
20void poly1305_core_setkey(struct poly1305_core_key *key,
21 const u8 raw_key[POLY1305_BLOCK_SIZE]);
22static inline void poly1305_core_init(struct poly1305_state *state)
23{
24 *state = (struct poly1305_state){};
25}
26
27void poly1305_core_blocks(struct poly1305_state *state,
28 const struct poly1305_core_key *key, const void *src,
29 unsigned int nblocks, u32 hibit);
30void poly1305_core_emit(const struct poly1305_state *state, const u32 nonce[4],
31 void *dst);
32
33void poly1305_block_init_arch(struct poly1305_block_state *state,
34 const u8 raw_key[POLY1305_BLOCK_SIZE]);
35void poly1305_block_init_generic(struct poly1305_block_state *state,
36 const u8 raw_key[POLY1305_BLOCK_SIZE]);
37void poly1305_blocks_arch(struct poly1305_block_state *state, const u8 *src,
38 unsigned int len, u32 padbit);
39
40static inline void poly1305_blocks_generic(struct poly1305_block_state *state,
41 const u8 *src, unsigned int len,
42 u32 padbit)
43{
44 poly1305_core_blocks(&state->h, &state->core_r, src,
45 len / POLY1305_BLOCK_SIZE, padbit);
46}
47
48void poly1305_emit_arch(const struct poly1305_state *state,
49 u8 digest[POLY1305_DIGEST_SIZE], const u32 nonce[4]);
50
51static inline void poly1305_emit_generic(const struct poly1305_state *state,
52 u8 digest[POLY1305_DIGEST_SIZE],
53 const u32 nonce[4])
54{
55 poly1305_core_emit(state, nonce, digest);
56}
57
58#endif