mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 16:12:02 +00:00
5f60d5f6bb
asm/unaligned.h is always an include of asm-generic/unaligned.h; might as well move that thing to linux/unaligned.h and include that - there's nothing arch-specific in that header. auto-generated by the following: for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $i done for i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $i done git mv include/asm-generic/unaligned.h include/linux/unaligned.h git mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.h sed -i -e "/unaligned.h/d" include/asm-generic/Kbuild sed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h
150 lines
3.7 KiB
C
150 lines
3.7 KiB
C
/*
|
|
* Poly1305 authenticator algorithm, RFC7539
|
|
*
|
|
* Copyright (C) 2015 Martin Willi
|
|
*
|
|
* Based on public domain code by Andrew Moon and Daniel J. Bernstein.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <crypto/internal/poly1305.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/unaligned.h>
|
|
|
|
static int crypto_poly1305_init(struct shash_desc *desc)
|
|
{
|
|
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
poly1305_core_init(&dctx->h);
|
|
dctx->buflen = 0;
|
|
dctx->rset = 0;
|
|
dctx->sset = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static 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->core_r, src);
|
|
src += POLY1305_BLOCK_SIZE;
|
|
srclen -= POLY1305_BLOCK_SIZE;
|
|
dctx->rset = 2;
|
|
}
|
|
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;
|
|
}
|
|
|
|
static void poly1305_blocks(struct poly1305_desc_ctx *dctx, const u8 *src,
|
|
unsigned int srclen)
|
|
{
|
|
unsigned int datalen;
|
|
|
|
if (unlikely(!dctx->sset)) {
|
|
datalen = crypto_poly1305_setdesckey(dctx, src, srclen);
|
|
src += srclen - datalen;
|
|
srclen = datalen;
|
|
}
|
|
|
|
poly1305_core_blocks(&dctx->h, &dctx->core_r, src,
|
|
srclen / POLY1305_BLOCK_SIZE, 1);
|
|
}
|
|
|
|
static int crypto_poly1305_update(struct shash_desc *desc,
|
|
const u8 *src, unsigned int srclen)
|
|
{
|
|
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
unsigned int bytes;
|
|
|
|
if (unlikely(dctx->buflen)) {
|
|
bytes = min(srclen, POLY1305_BLOCK_SIZE - dctx->buflen);
|
|
memcpy(dctx->buf + dctx->buflen, src, bytes);
|
|
src += bytes;
|
|
srclen -= bytes;
|
|
dctx->buflen += bytes;
|
|
|
|
if (dctx->buflen == POLY1305_BLOCK_SIZE) {
|
|
poly1305_blocks(dctx, dctx->buf,
|
|
POLY1305_BLOCK_SIZE);
|
|
dctx->buflen = 0;
|
|
}
|
|
}
|
|
|
|
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
|
|
poly1305_blocks(dctx, src, srclen);
|
|
src += srclen - (srclen % POLY1305_BLOCK_SIZE);
|
|
srclen %= POLY1305_BLOCK_SIZE;
|
|
}
|
|
|
|
if (unlikely(srclen)) {
|
|
dctx->buflen = srclen;
|
|
memcpy(dctx->buf, src, srclen);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)
|
|
{
|
|
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
if (unlikely(!dctx->sset))
|
|
return -ENOKEY;
|
|
|
|
poly1305_final_generic(dctx, dst);
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg poly1305_alg = {
|
|
.digestsize = POLY1305_DIGEST_SIZE,
|
|
.init = crypto_poly1305_init,
|
|
.update = crypto_poly1305_update,
|
|
.final = crypto_poly1305_final,
|
|
.descsize = sizeof(struct poly1305_desc_ctx),
|
|
.base = {
|
|
.cra_name = "poly1305",
|
|
.cra_driver_name = "poly1305-generic",
|
|
.cra_priority = 100,
|
|
.cra_blocksize = POLY1305_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init poly1305_mod_init(void)
|
|
{
|
|
return crypto_register_shash(&poly1305_alg);
|
|
}
|
|
|
|
static void __exit poly1305_mod_exit(void)
|
|
{
|
|
crypto_unregister_shash(&poly1305_alg);
|
|
}
|
|
|
|
subsys_initcall(poly1305_mod_init);
|
|
module_exit(poly1305_mod_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
|
|
MODULE_DESCRIPTION("Poly1305 authenticator");
|
|
MODULE_ALIAS_CRYPTO("poly1305");
|
|
MODULE_ALIAS_CRYPTO("poly1305-generic");
|