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/*
* Cryptographic API.
*
* Glue code for the SHA512 Secure Hash Algorithm assembler
* implementation using supplemental SSE3 / AVX / AVX2 instructions.
*
* This file is based on sha512_generic.c
*
* Copyright (C) 2013 Intel Corporation
* Author: Tim Chen <tim.c.chen@linux.intel.com>
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>
#include <crypto/sha512_base.h>
#include <asm/i387.h>
#include <asm/xcr.h>
#include <asm/xsave.h>
#include <linux/string.h>
asmlinkage void sha512_transform_ssse3(u64 *digest, const char *data,
u64 rounds);
#ifdef CONFIG_AS_AVX
asmlinkage void sha512_transform_avx(u64 *digest, const char *data,
u64 rounds);
#endif
#ifdef CONFIG_AS_AVX2
asmlinkage void sha512_transform_rorx(u64 *digest, const char *data,
u64 rounds);
#endif
static void (*sha512_transform_asm)(u64 *, const char *, u64);
static int sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
if (!irq_fpu_usable() ||
(sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
return crypto_sha512_update(desc, data, len);
/* make sure casting to sha512_block_fn() is safe */
BUILD_BUG_ON(offsetof(struct sha512_state, state) != 0);
kernel_fpu_begin();
sha512_base_do_update(desc, data, len,
(sha512_block_fn *)sha512_transform_asm);
kernel_fpu_end();
return 0;
}
static int sha512_ssse3_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
if (!irq_fpu_usable())
return crypto_sha512_finup(desc, data, len, out);
kernel_fpu_begin();
if (len)
sha512_base_do_update(desc, data, len,
(sha512_block_fn *)sha512_transform_asm);
sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_transform_asm);
kernel_fpu_end();
return sha512_base_finish(desc, out);
}
/* Add padding and return the message digest. */
static int sha512_ssse3_final(struct shash_desc *desc, u8 *out)
{
return sha512_ssse3_finup(desc, NULL, 0, out);
}
static struct shash_alg algs[] = { {
.digestsize = SHA512_DIGEST_SIZE,
.init = sha512_base_init,
.update = sha512_ssse3_update,
.final = sha512_ssse3_final,
.finup = sha512_ssse3_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha512",
.cra_driver_name = "sha512-ssse3",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA512_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA384_DIGEST_SIZE,
.init = sha384_base_init,
.update = sha512_ssse3_update,
.final = sha512_ssse3_final,
.finup = sha512_ssse3_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha384",
.cra_driver_name = "sha384-ssse3",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA384_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
#ifdef CONFIG_AS_AVX
static bool __init avx_usable(void)
{
u64 xcr0;
if (!cpu_has_avx || !cpu_has_osxsave)
return false;
xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
pr_info("AVX detected but unusable.\n");
return false;
}
return true;
}
#endif
static int __init sha512_ssse3_mod_init(void)
{
/* test for SSSE3 first */
if (cpu_has_ssse3)
sha512_transform_asm = sha512_transform_ssse3;
#ifdef CONFIG_AS_AVX
/* allow AVX to override SSSE3, it's a little faster */
if (avx_usable()) {
#ifdef CONFIG_AS_AVX2
if (boot_cpu_has(X86_FEATURE_AVX2))
sha512_transform_asm = sha512_transform_rorx;
else
#endif
sha512_transform_asm = sha512_transform_avx;
}
#endif
if (sha512_transform_asm) {
#ifdef CONFIG_AS_AVX
if (sha512_transform_asm == sha512_transform_avx)
pr_info("Using AVX optimized SHA-512 implementation\n");
#ifdef CONFIG_AS_AVX2
else if (sha512_transform_asm == sha512_transform_rorx)
pr_info("Using AVX2 optimized SHA-512 implementation\n");
#endif
else
#endif
pr_info("Using SSSE3 optimized SHA-512 implementation\n");
return crypto_register_shashes(algs, ARRAY_SIZE(algs));
}
pr_info("Neither AVX nor SSSE3 is available/usable.\n");
return -ENODEV;
}
static void __exit sha512_ssse3_mod_fini(void)
{
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}
module_init(sha512_ssse3_mod_init);
module_exit(sha512_ssse3_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, Supplemental SSE3 accelerated");
MODULE_ALIAS_CRYPTO("sha512");
MODULE_ALIAS_CRYPTO("sha384");
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