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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Poly1305 authenticator algorithm, RFC7539
*
* Copyright (C) 2015 Martin Willi
*
* Based on public domain code by Andrew Moon and Daniel J. Bernstein.
*/
#include <crypto/internal/blockhash.h>
#include <crypto/internal/poly1305.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/unaligned.h>
void poly1305_init(struct poly1305_desc_ctx *desc,
const u8 key[POLY1305_KEY_SIZE])
{
desc->s[0] = get_unaligned_le32(key + 16);
desc->s[1] = get_unaligned_le32(key + 20);
desc->s[2] = get_unaligned_le32(key + 24);
desc->s[3] = get_unaligned_le32(key + 28);
desc->buflen = 0;
if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
poly1305_block_init_arch(&desc->state, key);
else
poly1305_block_init_generic(&desc->state, key);
}
EXPORT_SYMBOL(poly1305_init);
static inline void poly1305_blocks(struct poly1305_block_state *state,
const u8 *src, unsigned int len)
{
if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
poly1305_blocks_arch(state, src, len, 1);
else
poly1305_blocks_generic(state, src, len, 1);
}
void poly1305_update(struct poly1305_desc_ctx *desc,
const u8 *src, unsigned int nbytes)
{
desc->buflen = BLOCK_HASH_UPDATE(poly1305_blocks, &desc->state,
src, nbytes, POLY1305_BLOCK_SIZE,
desc->buf, desc->buflen);
}
EXPORT_SYMBOL(poly1305_update);
void poly1305_final(struct poly1305_desc_ctx *desc, u8 *dst)
{
if (unlikely(desc->buflen)) {
desc->buf[desc->buflen++] = 1;
memset(desc->buf + desc->buflen, 0,
POLY1305_BLOCK_SIZE - desc->buflen);
if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
poly1305_blocks_arch(&desc->state, desc->buf,
POLY1305_BLOCK_SIZE, 0);
else
poly1305_blocks_generic(&desc->state, desc->buf,
POLY1305_BLOCK_SIZE, 0);
}
if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
poly1305_emit_arch(&desc->state.h, dst, desc->s);
else
poly1305_emit_generic(&desc->state.h, dst, desc->s);
*desc = (struct poly1305_desc_ctx){};
}
EXPORT_SYMBOL(poly1305_final);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
MODULE_DESCRIPTION("Poly1305 authenticator algorithm, RFC7539");
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