mirror of
https://github.com/koverstreet/bcachefs-tools.git
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77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/*
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* Poly1305 authenticator algorithm, RFC7539
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*
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* Copyright (C) 2015 Martin Willi
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*
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* Based on public domain code by Andrew Moon and Daniel J. Bernstein.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/byteorder.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <asm/unaligned.h>
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#include <linux/crypto.h>
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#include <crypto/algapi.h>
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#include <crypto/internal/hash.h>
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#include <crypto/poly1305.h>
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struct poly1305_desc_ctx {
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bool key_done;
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crypto_onetimeauth_poly1305_state s;
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};
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static int poly1305_init(struct shash_desc *desc)
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{
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struct poly1305_desc_ctx *state = shash_desc_ctx(desc);
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state->key_done = false;
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return 0;
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}
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static int poly1305_update(struct shash_desc *desc,
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const u8 *src, unsigned len)
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{
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struct poly1305_desc_ctx *state = shash_desc_ctx(desc);
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if (!state->key_done) {
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BUG_ON(len != crypto_onetimeauth_poly1305_KEYBYTES);
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state->key_done = true;
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return crypto_onetimeauth_poly1305_init(&state->s, src);
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}
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return crypto_onetimeauth_poly1305_update(&state->s, src, len);
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}
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static int poly1305_final(struct shash_desc *desc, u8 *out)
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{
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struct poly1305_desc_ctx *state = shash_desc_ctx(desc);
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return crypto_onetimeauth_poly1305_final(&state->s, out);
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}
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static struct shash_alg poly1305_alg = {
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.digestsize = crypto_onetimeauth_poly1305_BYTES,
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.init = poly1305_init,
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.update = poly1305_update,
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.final = poly1305_final,
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.descsize = sizeof(struct poly1305_desc_ctx),
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.base = {
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.cra_name = "poly1305",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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},
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};
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__attribute__((constructor(110)))
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static int poly1305_mod_init(void)
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{
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return crypto_register_shash(&poly1305_alg);
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}
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