/*
* 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 <asm/byteorder.h>
#include <asm/i387.h>
#include <asm/xcr.h>
#include <asm/xsave.h>
#include <linux/string.h>
asmlinkage void sha512_transform_ssse3(const char *data, u64 *digest,
u64 rounds);
#ifdef CONFIG_AS_AVX
asmlinkage void sha512_transform_avx(const char *data, u64 *digest,
u64 rounds);
#endif
#ifdef CONFIG_AS_AVX2
asmlinkage void sha512_transform_rorx(const char *data, u64 *digest,
u64 rounds);
#endif
static asmlinkage void (*sha512_transform_asm)(const char *, u64 *, u64);
static int sha512_ssse3_init(struct shash_desc *desc)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
sctx->state[0] = SHA512_H0;
sctx->state[1] = SHA512_H1;
sctx->state[2] = SHA512_H2;
sctx->state[3] = SHA512_H3;
sctx->state[4] = SHA512_H4;
sctx->state[5] = SHA512_H5;
sctx->state[6] = SHA512_H6;
sctx->state[7] = SHA512_H7;
sctx->count[0] = sctx->count[1] = 0;
return 0;
}
static int __sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
unsigned int len, unsigned int partial)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
unsigned int done = 0;
sctx->count[0] += len;
if (sctx->count[0] < len)
sctx->count[1]++;
if (partial) {
done = SHA512_BLOCK_SIZE - partial;
memcpy(sctx->buf + partial, data, done);
sha512_transform_asm(sctx->buf, sctx->state, 1);
}
if (len - done >= SHA512_BLOCK_SIZE) {
const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;
sha512_transform_asm(data + done, sctx->state, (u64) rounds);
done += rounds * SHA512_BLOCK_SIZE;
}
memcpy(sctx->buf, data + done, len - done);
return 0;
}
static int sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
int res;
/* Handle the fast case right here */
if (partial + len < SHA512_BLOCK_SIZE) {
sctx->count[0] += len;
if (sctx->count[0] < len)
sctx->count[1]++;
memcpy(sctx->buf + partial, data, len);
return 0;
}
if (!irq_fpu_usable()) {
res = crypto_sha512_update(desc, data, len);
} else {
kernel_fpu_begin();
res = __sha512_ssse3_update(desc, data, len, partial);
kernel_fpu_end();
}
return res;
}
/* Add padding and return the message digest. */
static int sha512_ssse3_final(struct shash_desc *desc, u8 *out)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
unsigned int i, index, padlen;
__be64 *dst = (__be64 *)out;
__be64 bits[2];
static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };
/* save number of bits */
bits[1] = cpu_to_be64(sctx->count[0] << 3);
bits[0] = cpu_to_be64(sctx->count[1] << 3) | sctx->count[0] >> 61;
/* Pad out to 112 mod 128 and append length */
index = sctx->count[0] & 0x7f;
padlen = (index < 112) ? (112 - index) : ((128+112) - index);
if (!irq_fpu_usable()) {
crypto_sha512_update(desc, padding, padlen);
crypto_sha512_update(desc, (const u8 *)&bits, sizeof(bits));
} else {
kernel_fpu_begin();
/* We need to fill a whole block for __sha512_ssse3_update() */
if (padlen <= 112) {
sctx->count[0] += padlen;
if (sctx->count[0] < padlen)
sctx->count[1]++;
memcpy(sctx->buf + index, padding, padlen);
} else {
__sha512_ssse3_update(desc, padding, padlen, index);
}
__sha512_ssse3_update(desc, (const u8 *)&bits,
sizeof(bits), 112);
kernel_fpu_end();
}
/* Store state in digest */
for (i = 0; i < 8; i++)
dst[i] = cpu_to_be64(sctx->state[i]);
/* Wipe context */
memset(sctx, 0, sizeof(*sctx));
return 0;
}
static int sha512_ssse3_export(struct shash_desc *desc, void *out)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
memcpy(out, sctx, sizeof(*sctx));
return 0;
}
static int sha512_ssse3_import(struct shash_desc *desc, const void *in)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
memcpy(sctx, in, sizeof(*sctx));
return 0;
}
static int sha384_ssse3_init(struct shash_desc *desc)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
sctx->state[0] = SHA384_H0;
sctx->state[1] = SHA384_H1;
sctx->state[2] = SHA384_H2;
sctx->state[3] = SHA384_H3;
sctx->state[4] = SHA384_H4;
sctx->state[5] = SHA384_H5;
sctx->state[6] = SHA384_H6;
sctx->state[7] = SHA384_H7;
sctx->count[0] = sctx->count[1] = 0;
return 0;
}
static int sha384_ssse3_final(struct shash_desc *desc, u8 *hash)
{
u8 D[SHA512_DIGEST_SIZE];
sha512_ssse3_final(desc, D);
memcpy(hash, D, SHA384_DIGEST_SIZE);
memset(D, 0, SHA512_DIGEST_SIZE);
return 0;
}
static struct shash_alg algs[] = { {
.digestsize = SHA512_DIGEST_SIZE,
.init = sha512_ssse3_init,
.update = sha512_ssse3_update,
.final = sha512_ssse3_final,
.export = sha512_ssse3_export,
.import = sha512_ssse3_import,
.descsize = sizeof(struct sha512_state),
.statesize = 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_ssse3_init,
.update = sha512_ssse3_update,
.final = sha384_ssse3_final,
.export = sha512_ssse3_export,
.import = sha512_ssse3_import,
.descsize = sizeof(struct sha512_state),
.statesize = 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("sha512");
MODULE_ALIAS("sha384");
