65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Common values for the Poly1305 algorithm
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*/
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#ifndef _CRYPTO_POLY1305_H
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#define _CRYPTO_POLY1305_H
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#include <linux/types.h>
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#include <linux/crypto.h>
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#define POLY1305_BLOCK_SIZE 16
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#define POLY1305_KEY_SIZE 32
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#define POLY1305_DIGEST_SIZE 16
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struct poly1305_key {
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u32 r[5]; /* key, base 2^26 */
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};
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struct poly1305_state {
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u32 h[5]; /* accumulator, base 2^26 */
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};
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struct poly1305_desc_ctx {
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/* key */
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struct poly1305_key r;
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/* finalize key */
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u32 s[4];
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/* accumulator */
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struct poly1305_state h;
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/* partial buffer */
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u8 buf[POLY1305_BLOCK_SIZE];
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/* bytes used in partial buffer */
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unsigned int buflen;
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/* r key has been set */
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bool rset;
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/* s key has been set */
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bool sset;
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};
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/*
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* Poly1305 core functions. These implement the ε-almost-∆-universal hash
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* function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
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* ("s key") at the end. They also only support block-aligned inputs.
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*/
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void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key);
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static inline void poly1305_core_init(struct poly1305_state *state)
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{
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memset(state->h, 0, sizeof(state->h));
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}
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void poly1305_core_blocks(struct poly1305_state *state,
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const struct poly1305_key *key,
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const void *src, unsigned int nblocks);
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void poly1305_core_emit(const struct poly1305_state *state, void *dst);
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/* Crypto API helper functions for the Poly1305 MAC */
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int crypto_poly1305_init(struct shash_desc *desc);
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unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
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const u8 *src, unsigned int srclen);
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int crypto_poly1305_update(struct shash_desc *desc,
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const u8 *src, unsigned int srclen);
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int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);
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#endif
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