878afc35cd
In preparation for exposing a low-level Poly1305 API which implements the ε-almost-∆-universal (εA∆U) hash function underlying the Poly1305 MAC and supports block-aligned inputs only, create structures poly1305_key and poly1305_state which hold the limbs of the Poly1305 "r" key and accumulator, respectively. These structures could actually have the same type (e.g. poly1305_val), but different types are preferable, to prevent misuse. Acked-by: Martin Willi <martin@strongswan.org> Signed-off-by: Eric Biggers <ebiggers@google.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
/* 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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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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