124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/*
|
|
* Poly1305 authenticator algorithm, RFC7539, SIMD glue code
|
|
*
|
|
* Copyright (C) 2015 Martin Willi
|
|
*
|
|
* 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/poly1305.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <asm/fpu/api.h>
|
|
#include <asm/simd.h>
|
|
|
|
asmlinkage void poly1305_block_sse2(u32 *h, const u8 *src,
|
|
const u32 *r, unsigned int blocks);
|
|
|
|
static unsigned int poly1305_simd_blocks(struct poly1305_desc_ctx *dctx,
|
|
const u8 *src, unsigned int srclen)
|
|
{
|
|
unsigned int blocks, datalen;
|
|
|
|
if (unlikely(!dctx->sset)) {
|
|
datalen = crypto_poly1305_setdesckey(dctx, src, srclen);
|
|
src += srclen - datalen;
|
|
srclen = datalen;
|
|
}
|
|
|
|
if (srclen >= POLY1305_BLOCK_SIZE) {
|
|
blocks = srclen / POLY1305_BLOCK_SIZE;
|
|
poly1305_block_sse2(dctx->h, src, dctx->r, blocks);
|
|
srclen -= POLY1305_BLOCK_SIZE * blocks;
|
|
}
|
|
return srclen;
|
|
}
|
|
|
|
static int poly1305_simd_update(struct shash_desc *desc,
|
|
const u8 *src, unsigned int srclen)
|
|
{
|
|
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
unsigned int bytes;
|
|
|
|
/* kernel_fpu_begin/end is costly, use fallback for small updates */
|
|
if (srclen <= 288 || !may_use_simd())
|
|
return crypto_poly1305_update(desc, src, srclen);
|
|
|
|
kernel_fpu_begin();
|
|
|
|
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_simd_blocks(dctx, dctx->buf,
|
|
POLY1305_BLOCK_SIZE);
|
|
dctx->buflen = 0;
|
|
}
|
|
}
|
|
|
|
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
|
|
bytes = poly1305_simd_blocks(dctx, src, srclen);
|
|
src += srclen - bytes;
|
|
srclen = bytes;
|
|
}
|
|
|
|
kernel_fpu_end();
|
|
|
|
if (unlikely(srclen)) {
|
|
dctx->buflen = srclen;
|
|
memcpy(dctx->buf, src, srclen);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg alg = {
|
|
.digestsize = POLY1305_DIGEST_SIZE,
|
|
.init = crypto_poly1305_init,
|
|
.update = poly1305_simd_update,
|
|
.final = crypto_poly1305_final,
|
|
.setkey = crypto_poly1305_setkey,
|
|
.descsize = sizeof(struct poly1305_desc_ctx),
|
|
.base = {
|
|
.cra_name = "poly1305",
|
|
.cra_driver_name = "poly1305-simd",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
|
|
.cra_alignmask = sizeof(u32) - 1,
|
|
.cra_blocksize = POLY1305_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init poly1305_simd_mod_init(void)
|
|
{
|
|
if (!cpu_has_xmm2)
|
|
return -ENODEV;
|
|
|
|
return crypto_register_shash(&alg);
|
|
}
|
|
|
|
static void __exit poly1305_simd_mod_exit(void)
|
|
{
|
|
crypto_unregister_shash(&alg);
|
|
}
|
|
|
|
module_init(poly1305_simd_mod_init);
|
|
module_exit(poly1305_simd_mod_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
|
|
MODULE_DESCRIPTION("Poly1305 authenticator");
|
|
MODULE_ALIAS_CRYPTO("poly1305");
|
|
MODULE_ALIAS_CRYPTO("poly1305-simd");
|