[thirdparty/linux.git] / lib / crypto / poly1305.c

// 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/poly1305.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/unaligned.h>

void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key)
{
	poly1305_core_setkey(&desc->core_r, key);
	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);
	poly1305_core_init(&desc->h);
	desc->buflen = 0;
	desc->sset = true;
	desc->rset = 2;
}
EXPORT_SYMBOL_GPL(poly1305_init_generic);

void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src,
			     unsigned int nbytes)
{
	unsigned int bytes;

	if (unlikely(desc->buflen)) {
		bytes = min(nbytes, POLY1305_BLOCK_SIZE - desc->buflen);
		memcpy(desc->buf + desc->buflen, src, bytes);
		src += bytes;
		nbytes -= bytes;
		desc->buflen += bytes;

		if (desc->buflen == POLY1305_BLOCK_SIZE) {
			poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf,
					     1, 1);
			desc->buflen = 0;
		}
	}

	if (likely(nbytes >= POLY1305_BLOCK_SIZE)) {
		poly1305_core_blocks(&desc->h, &desc->core_r, src,
				     nbytes / POLY1305_BLOCK_SIZE, 1);
		src += nbytes - (nbytes % POLY1305_BLOCK_SIZE);
		nbytes %= POLY1305_BLOCK_SIZE;
	}

	if (unlikely(nbytes)) {
		desc->buflen = nbytes;
		memcpy(desc->buf, src, nbytes);
	}
}
EXPORT_SYMBOL_GPL(poly1305_update_generic);

void poly1305_final_generic(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);
		poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, 1, 0);
	}

	poly1305_core_emit(&desc->h, desc->s, dst);
	*desc = (struct poly1305_desc_ctx){};
}
EXPORT_SYMBOL_GPL(poly1305_final_generic);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
Commit	Line	Data
48ea8c6e AB	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Poly1305 authenticator algorithm, RFC7539
	4	*
	5	* Copyright (C) 2015 Martin Willi
	6	*
	7	* Based on public domain code by Andrew Moon and Daniel J. Bernstein.
	8	*/
	9
	10	#include <crypto/internal/poly1305.h>
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <asm/unaligned.h>
	14
a1d93064 AB	15	void poly1305_init_generic(struct poly1305_desc_ctx desc, const u8 key)
a1d93064 AB	16	{
1c08a104	17	poly1305_core_setkey(&desc->core_r, key);
a1d93064 AB	18	desc->s[0] = get_unaligned_le32(key + 16);
	19	desc->s[1] = get_unaligned_le32(key + 20);
	20	desc->s[2] = get_unaligned_le32(key + 24);
	21	desc->s[3] = get_unaligned_le32(key + 28);
	22	poly1305_core_init(&desc->h);
	23	desc->buflen = 0;
	24	desc->sset = true;
1c08a104	25	desc->rset = 2;
a1d93064 AB	26	}
	27	EXPORT_SYMBOL_GPL(poly1305_init_generic);
	28
	29	void poly1305_update_generic(struct poly1305_desc_ctx desc, const u8 src,
	30	unsigned int nbytes)
	31	{
	32	unsigned int bytes;
	33
	34	if (unlikely(desc->buflen)) {
	35	bytes = min(nbytes, POLY1305_BLOCK_SIZE - desc->buflen);
	36	memcpy(desc->buf + desc->buflen, src, bytes);
	37	src += bytes;
	38	nbytes -= bytes;
	39	desc->buflen += bytes;
	40
	41	if (desc->buflen == POLY1305_BLOCK_SIZE) {
1c08a104 JD	42	poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf,
1c08a104 JD	43	1, 1);
a1d93064 AB	44	desc->buflen = 0;
	45	}
	46	}
	47
	48	if (likely(nbytes >= POLY1305_BLOCK_SIZE)) {
1c08a104	49	poly1305_core_blocks(&desc->h, &desc->core_r, src,
a1d93064 AB	50	nbytes / POLY1305_BLOCK_SIZE, 1);
	51	src += nbytes - (nbytes % POLY1305_BLOCK_SIZE);
	52	nbytes %= POLY1305_BLOCK_SIZE;
	53	}
	54
	55	if (unlikely(nbytes)) {
	56	desc->buflen = nbytes;
	57	memcpy(desc->buf, src, nbytes);
	58	}
	59	}
	60	EXPORT_SYMBOL_GPL(poly1305_update_generic);
	61
	62	void poly1305_final_generic(struct poly1305_desc_ctx desc, u8 dst)
	63	{
a1d93064 AB	64	if (unlikely(desc->buflen)) {
	65	desc->buf[desc->buflen++] = 1;
	66	memset(desc->buf + desc->buflen, 0,
	67	POLY1305_BLOCK_SIZE - desc->buflen);
1c08a104	68	poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, 1, 0);
a1d93064 AB	69	}
a1d93064 AB	70
1c08a104	71	poly1305_core_emit(&desc->h, desc->s, dst);
a1d93064 AB	72	*desc = (struct poly1305_desc_ctx){};
	73	}
	74	EXPORT_SYMBOL_GPL(poly1305_final_generic);
	75
48ea8c6e AB	76	MODULE_LICENSE("GPL");
48ea8c6e AB	77	MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");