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// SPDX-License-Identifier: GPL-2.0
/*
* Poly1305 authenticator algorithm, RFC7539.
*
* Copyright 2023- IBM Corp. All rights reserved.
*/
#include <crypto/algapi.h>
#include <linux/crypto.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/jump_label.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/poly1305.h>
#include <crypto/internal/simd.h>
#include <linux/cpufeature.h>
#include <asm/unaligned.h>
#include <asm/simd.h>
#include <asm/switch_to.h>
asmlinkage void poly1305_p10le_4blocks(void *h, const u8 *m, u32 mlen);
asmlinkage void poly1305_64s(void *h, const u8 *m, u32 mlen, int highbit);
asmlinkage void poly1305_emit_64(void *h, void *s, u8 *dst);
static void vsx_begin(void)
{
preempt_disable();
enable_kernel_vsx();
}
static void vsx_end(void)
{
disable_kernel_vsx();
preempt_enable();
}
static int crypto_poly1305_p10_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_setdctxkey(struct poly1305_desc_ctx *dctx,
const u8 *inp, unsigned int len)
{
unsigned int acc = 0;
if (unlikely(!dctx->sset)) {
if (!dctx->rset && len >= POLY1305_BLOCK_SIZE) {
struct poly1305_core_key *key = &dctx->core_r;
key->key.r64[0] = get_unaligned_le64(&inp[0]);
key->key.r64[1] = get_unaligned_le64(&inp[8]);
inp += POLY1305_BLOCK_SIZE;
len -= POLY1305_BLOCK_SIZE;
acc += POLY1305_BLOCK_SIZE;
dctx->rset = 1;
}
if (len >= POLY1305_BLOCK_SIZE) {
dctx->s[0] = get_unaligned_le32(&inp[0]);
dctx->s[1] = get_unaligned_le32(&inp[4]);
dctx->s[2] = get_unaligned_le32(&inp[8]);
dctx->s[3] = get_unaligned_le32(&inp[12]);
acc += POLY1305_BLOCK_SIZE;
dctx->sset = true;
}
}
return acc;
}
static int crypto_poly1305_p10_update(struct shash_desc *desc,
const u8 *src, unsigned int srclen)
{
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
unsigned int bytes, used;
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) {
if (likely(!crypto_poly1305_setdctxkey(dctx, dctx->buf,
POLY1305_BLOCK_SIZE))) {
vsx_begin();
poly1305_64s(&dctx->h, dctx->buf,
POLY1305_BLOCK_SIZE, 1);
vsx_end();
}
dctx->buflen = 0;
}
}
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
bytes = round_down(srclen, POLY1305_BLOCK_SIZE);
used = crypto_poly1305_setdctxkey(dctx, src, bytes);
if (likely(used)) {
srclen -= used;
src += used;
}
if (crypto_simd_usable() && (srclen >= POLY1305_BLOCK_SIZE*4)) {
vsx_begin();
poly1305_p10le_4blocks(&dctx->h, src, srclen);
vsx_end();
src += srclen - (srclen % (POLY1305_BLOCK_SIZE * 4));
srclen %= POLY1305_BLOCK_SIZE * 4;
}
while (srclen >= POLY1305_BLOCK_SIZE) {
vsx_begin();
poly1305_64s(&dctx->h, src, POLY1305_BLOCK_SIZE, 1);
vsx_end();
srclen -= POLY1305_BLOCK_SIZE;
src += POLY1305_BLOCK_SIZE;
}
}
if (unlikely(srclen)) {
dctx->buflen = srclen;
memcpy(dctx->buf, src, srclen);
}
return 0;
}
static int crypto_poly1305_p10_final(struct shash_desc *desc, u8 *dst)
{
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
if (unlikely(!dctx->sset))
return -ENOKEY;
if ((dctx->buflen)) {
dctx->buf[dctx->buflen++] = 1;
memset(dctx->buf + dctx->buflen, 0,
POLY1305_BLOCK_SIZE - dctx->buflen);
vsx_begin();
poly1305_64s(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0);
vsx_end();
dctx->buflen = 0;
}
poly1305_emit_64(&dctx->h, &dctx->s, dst);
return 0;
}
static struct shash_alg poly1305_alg = {
.digestsize = POLY1305_DIGEST_SIZE,
.init = crypto_poly1305_p10_init,
.update = crypto_poly1305_p10_update,
.final = crypto_poly1305_p10_final,
.descsize = sizeof(struct poly1305_desc_ctx),
.base = {
.cra_name = "poly1305",
.cra_driver_name = "poly1305-p10",
.cra_priority = 300,
.cra_blocksize = POLY1305_BLOCK_SIZE,
.cra_module = THIS_MODULE,
},
};
static int __init poly1305_p10_init(void)
{
return crypto_register_shash(&poly1305_alg);
}
static void __exit poly1305_p10_exit(void)
{
crypto_unregister_shash(&poly1305_alg);
}
module_cpu_feature_match(PPC_MODULE_FEATURE_P10, poly1305_p10_init);
module_exit(poly1305_p10_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Danny Tsen <dtsen@linux.ibm.com>");
MODULE_DESCRIPTION("Optimized Poly1305 for P10");
MODULE_ALIAS_CRYPTO("poly1305");
MODULE_ALIAS_CRYPTO("poly1305-p10");
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