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Tip revision: e42617b825f8073569da76dc4510bfa019b1c35a authored by Linus Torvalds on 08 December 2019, 22:57:55 UTC
Linux 5.5-rc1
Linux 5.5-rc1
Tip revision: e42617b
poly1305.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Common values for the Poly1305 algorithm
*/
#ifndef _CRYPTO_INTERNAL_POLY1305_H
#define _CRYPTO_INTERNAL_POLY1305_H
#include <asm/unaligned.h>
#include <linux/types.h>
#include <crypto/poly1305.h>
/*
* Poly1305 core functions. These implement the ε-almost-∆-universal hash
* function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
* ("s key") at the end. They also only support block-aligned inputs.
*/
void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key);
static inline void poly1305_core_init(struct poly1305_state *state)
{
*state = (struct poly1305_state){};
}
void poly1305_core_blocks(struct poly1305_state *state,
const struct poly1305_key *key, const void *src,
unsigned int nblocks, u32 hibit);
void poly1305_core_emit(const struct poly1305_state *state, void *dst);
/*
* Poly1305 requires a unique key for each tag, which implies that we can't set
* it on the tfm that gets accessed by multiple users simultaneously. Instead we
* expect the key as the first 32 bytes in the update() call.
*/
static inline
unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
const u8 *src, unsigned int srclen)
{
if (!dctx->sset) {
if (!dctx->rset && srclen >= POLY1305_BLOCK_SIZE) {
poly1305_core_setkey(dctx->r, src);
src += POLY1305_BLOCK_SIZE;
srclen -= POLY1305_BLOCK_SIZE;
dctx->rset = 1;
}
if (srclen >= POLY1305_BLOCK_SIZE) {
dctx->s[0] = get_unaligned_le32(src + 0);
dctx->s[1] = get_unaligned_le32(src + 4);
dctx->s[2] = get_unaligned_le32(src + 8);
dctx->s[3] = get_unaligned_le32(src + 12);
src += POLY1305_BLOCK_SIZE;
srclen -= POLY1305_BLOCK_SIZE;
dctx->sset = true;
}
}
return srclen;
}
#endif