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// SPDX-License-Identifier: GPL-2.0-only
/*
* GHASH using the RISC-V vector crypto extensions
*
* Copyright (C) 2023 VRULL GmbH
* Author: Heiko Stuebner <heiko.stuebner@vrull.eu>
*
* Copyright (C) 2023 SiFive, Inc.
* Author: Jerry Shih <jerry.shih@sifive.com>
*/
#include <asm/simd.h>
#include <asm/vector.h>
#include <crypto/ghash.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>
#include <linux/linkage.h>
#include <linux/module.h>
asmlinkage void ghash_zvkg(be128 *accumulator, const be128 *key, const u8 *data,
size_t len);
struct riscv64_ghash_tfm_ctx {
be128 key;
};
struct riscv64_ghash_desc_ctx {
be128 accumulator;
u8 buffer[GHASH_BLOCK_SIZE];
u32 bytes;
};
static int riscv64_ghash_setkey(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
struct riscv64_ghash_tfm_ctx *tctx = crypto_shash_ctx(tfm);
if (keylen != GHASH_BLOCK_SIZE)
return -EINVAL;
memcpy(&tctx->key, key, GHASH_BLOCK_SIZE);
return 0;
}
static int riscv64_ghash_init(struct shash_desc *desc)
{
struct riscv64_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
*dctx = (struct riscv64_ghash_desc_ctx){};
return 0;
}
static inline void
riscv64_ghash_blocks(const struct riscv64_ghash_tfm_ctx *tctx,
struct riscv64_ghash_desc_ctx *dctx,
const u8 *src, size_t srclen)
{
/* The srclen is nonzero and a multiple of 16. */
if (crypto_simd_usable()) {
kernel_vector_begin();
ghash_zvkg(&dctx->accumulator, &tctx->key, src, srclen);
kernel_vector_end();
} else {
do {
crypto_xor((u8 *)&dctx->accumulator, src,
GHASH_BLOCK_SIZE);
gf128mul_lle(&dctx->accumulator, &tctx->key);
src += GHASH_BLOCK_SIZE;
srclen -= GHASH_BLOCK_SIZE;
} while (srclen);
}
}
static int riscv64_ghash_update(struct shash_desc *desc, const u8 *src,
unsigned int srclen)
{
const struct riscv64_ghash_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
struct riscv64_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
unsigned int len;
if (dctx->bytes) {
if (dctx->bytes + srclen < GHASH_BLOCK_SIZE) {
memcpy(dctx->buffer + dctx->bytes, src, srclen);
dctx->bytes += srclen;
return 0;
}
memcpy(dctx->buffer + dctx->bytes, src,
GHASH_BLOCK_SIZE - dctx->bytes);
riscv64_ghash_blocks(tctx, dctx, dctx->buffer,
GHASH_BLOCK_SIZE);
src += GHASH_BLOCK_SIZE - dctx->bytes;
srclen -= GHASH_BLOCK_SIZE - dctx->bytes;
dctx->bytes = 0;
}
len = round_down(srclen, GHASH_BLOCK_SIZE);
if (len) {
riscv64_ghash_blocks(tctx, dctx, src, len);
src += len;
srclen -= len;
}
if (srclen) {
memcpy(dctx->buffer, src, srclen);
dctx->bytes = srclen;
}
return 0;
}
static int riscv64_ghash_final(struct shash_desc *desc, u8 *out)
{
const struct riscv64_ghash_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
struct riscv64_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
int i;
if (dctx->bytes) {
for (i = dctx->bytes; i < GHASH_BLOCK_SIZE; i++)
dctx->buffer[i] = 0;
riscv64_ghash_blocks(tctx, dctx, dctx->buffer,
GHASH_BLOCK_SIZE);
}
memcpy(out, &dctx->accumulator, GHASH_DIGEST_SIZE);
return 0;
}
static struct shash_alg riscv64_ghash_alg = {
.init = riscv64_ghash_init,
.update = riscv64_ghash_update,
.final = riscv64_ghash_final,
.setkey = riscv64_ghash_setkey,
.descsize = sizeof(struct riscv64_ghash_desc_ctx),
.digestsize = GHASH_DIGEST_SIZE,
.base = {
.cra_blocksize = GHASH_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct riscv64_ghash_tfm_ctx),
.cra_priority = 300,
.cra_name = "ghash",
.cra_driver_name = "ghash-riscv64-zvkg",
.cra_module = THIS_MODULE,
},
};
static int __init riscv64_ghash_mod_init(void)
{
if (riscv_isa_extension_available(NULL, ZVKG) &&
riscv_vector_vlen() >= 128)
return crypto_register_shash(&riscv64_ghash_alg);
return -ENODEV;
}
static void __exit riscv64_ghash_mod_exit(void)
{
crypto_unregister_shash(&riscv64_ghash_alg);
}
module_init(riscv64_ghash_mod_init);
module_exit(riscv64_ghash_mod_exit);
MODULE_DESCRIPTION("GHASH (RISC-V accelerated)");
MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@vrull.eu>");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("ghash");
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