mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
b913a6404c
This patches modifies the GHASH secure hash implementation to switch to a faster, polynomial multiplication based reduction instead of one that uses shifts and rotates. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/*
|
|
* Accelerated GHASH implementation with ARMv8 PMULL instructions.
|
|
*
|
|
* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <asm/neon.h>
|
|
#include <asm/unaligned.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <linux/cpufeature.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/module.h>
|
|
|
|
MODULE_DESCRIPTION("GHASH secure hash using ARMv8 Crypto Extensions");
|
|
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
#define GHASH_BLOCK_SIZE 16
|
|
#define GHASH_DIGEST_SIZE 16
|
|
|
|
struct ghash_key {
|
|
u64 a;
|
|
u64 b;
|
|
};
|
|
|
|
struct ghash_desc_ctx {
|
|
u64 digest[GHASH_DIGEST_SIZE/sizeof(u64)];
|
|
u8 buf[GHASH_BLOCK_SIZE];
|
|
u32 count;
|
|
};
|
|
|
|
asmlinkage void pmull_ghash_update(int blocks, u64 dg[], const char *src,
|
|
struct ghash_key const *k, const char *head);
|
|
|
|
static int ghash_init(struct shash_desc *desc)
|
|
{
|
|
struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
*ctx = (struct ghash_desc_ctx){};
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_update(struct shash_desc *desc, const u8 *src,
|
|
unsigned int len)
|
|
{
|
|
struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
|
|
|
|
ctx->count += len;
|
|
|
|
if ((partial + len) >= GHASH_BLOCK_SIZE) {
|
|
struct ghash_key *key = crypto_shash_ctx(desc->tfm);
|
|
int blocks;
|
|
|
|
if (partial) {
|
|
int p = GHASH_BLOCK_SIZE - partial;
|
|
|
|
memcpy(ctx->buf + partial, src, p);
|
|
src += p;
|
|
len -= p;
|
|
}
|
|
|
|
blocks = len / GHASH_BLOCK_SIZE;
|
|
len %= GHASH_BLOCK_SIZE;
|
|
|
|
kernel_neon_begin_partial(8);
|
|
pmull_ghash_update(blocks, ctx->digest, src, key,
|
|
partial ? ctx->buf : NULL);
|
|
kernel_neon_end();
|
|
src += blocks * GHASH_BLOCK_SIZE;
|
|
partial = 0;
|
|
}
|
|
if (len)
|
|
memcpy(ctx->buf + partial, src, len);
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_final(struct shash_desc *desc, u8 *dst)
|
|
{
|
|
struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
|
|
|
|
if (partial) {
|
|
struct ghash_key *key = crypto_shash_ctx(desc->tfm);
|
|
|
|
memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial);
|
|
|
|
kernel_neon_begin_partial(8);
|
|
pmull_ghash_update(1, ctx->digest, ctx->buf, key, NULL);
|
|
kernel_neon_end();
|
|
}
|
|
put_unaligned_be64(ctx->digest[1], dst);
|
|
put_unaligned_be64(ctx->digest[0], dst + 8);
|
|
|
|
*ctx = (struct ghash_desc_ctx){};
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_setkey(struct crypto_shash *tfm,
|
|
const u8 *inkey, unsigned int keylen)
|
|
{
|
|
struct ghash_key *key = crypto_shash_ctx(tfm);
|
|
u64 a, b;
|
|
|
|
if (keylen != GHASH_BLOCK_SIZE) {
|
|
crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* perform multiplication by 'x' in GF(2^128) */
|
|
b = get_unaligned_be64(inkey);
|
|
a = get_unaligned_be64(inkey + 8);
|
|
|
|
key->a = (a << 1) | (b >> 63);
|
|
key->b = (b << 1) | (a >> 63);
|
|
|
|
if (b >> 63)
|
|
key->b ^= 0xc200000000000000UL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg ghash_alg = {
|
|
.digestsize = GHASH_DIGEST_SIZE,
|
|
.init = ghash_init,
|
|
.update = ghash_update,
|
|
.final = ghash_final,
|
|
.setkey = ghash_setkey,
|
|
.descsize = sizeof(struct ghash_desc_ctx),
|
|
.base = {
|
|
.cra_name = "ghash",
|
|
.cra_driver_name = "ghash-ce",
|
|
.cra_priority = 200,
|
|
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
|
|
.cra_blocksize = GHASH_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct ghash_key),
|
|
.cra_module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init ghash_ce_mod_init(void)
|
|
{
|
|
return crypto_register_shash(&ghash_alg);
|
|
}
|
|
|
|
static void __exit ghash_ce_mod_exit(void)
|
|
{
|
|
crypto_unregister_shash(&ghash_alg);
|
|
}
|
|
|
|
module_cpu_feature_match(PMULL, ghash_ce_mod_init);
|
|
module_exit(ghash_ce_mod_exit);
|