mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 17:12:06 +00:00
a6326ba025
Memset on a local variable may be removed when it is called just before the variable goes out of scope. Using memzero_explicit defeats this optimization. A simplified version of the semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier x; type T; @@ { ... when any T x[...]; ... when any when exists - memset + memzero_explicit (x, -0, ...) ... when != x when strict } // </smpl> This change was suggested by Daniel Borkmann <dborkman@redhat.com> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
323 lines
8.0 KiB
C
323 lines
8.0 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* Glue code for the SHA256 Secure Hash Algorithm assembler
|
|
* implementation using supplemental SSE3 / AVX / AVX2 instructions.
|
|
*
|
|
* This file is based on sha256_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 sha256_transform_ssse3(const char *data, u32 *digest,
|
|
u64 rounds);
|
|
#ifdef CONFIG_AS_AVX
|
|
asmlinkage void sha256_transform_avx(const char *data, u32 *digest,
|
|
u64 rounds);
|
|
#endif
|
|
#ifdef CONFIG_AS_AVX2
|
|
asmlinkage void sha256_transform_rorx(const char *data, u32 *digest,
|
|
u64 rounds);
|
|
#endif
|
|
|
|
static asmlinkage void (*sha256_transform_asm)(const char *, u32 *, u64);
|
|
|
|
|
|
static int sha256_ssse3_init(struct shash_desc *desc)
|
|
{
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
|
|
|
sctx->state[0] = SHA256_H0;
|
|
sctx->state[1] = SHA256_H1;
|
|
sctx->state[2] = SHA256_H2;
|
|
sctx->state[3] = SHA256_H3;
|
|
sctx->state[4] = SHA256_H4;
|
|
sctx->state[5] = SHA256_H5;
|
|
sctx->state[6] = SHA256_H6;
|
|
sctx->state[7] = SHA256_H7;
|
|
sctx->count = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __sha256_ssse3_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, unsigned int partial)
|
|
{
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
|
unsigned int done = 0;
|
|
|
|
sctx->count += len;
|
|
|
|
if (partial) {
|
|
done = SHA256_BLOCK_SIZE - partial;
|
|
memcpy(sctx->buf + partial, data, done);
|
|
sha256_transform_asm(sctx->buf, sctx->state, 1);
|
|
}
|
|
|
|
if (len - done >= SHA256_BLOCK_SIZE) {
|
|
const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
|
|
|
|
sha256_transform_asm(data + done, sctx->state, (u64) rounds);
|
|
|
|
done += rounds * SHA256_BLOCK_SIZE;
|
|
}
|
|
|
|
memcpy(sctx->buf, data + done, len - done);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sha256_ssse3_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len)
|
|
{
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
|
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
|
|
int res;
|
|
|
|
/* Handle the fast case right here */
|
|
if (partial + len < SHA256_BLOCK_SIZE) {
|
|
sctx->count += len;
|
|
memcpy(sctx->buf + partial, data, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (!irq_fpu_usable()) {
|
|
res = crypto_sha256_update(desc, data, len);
|
|
} else {
|
|
kernel_fpu_begin();
|
|
res = __sha256_ssse3_update(desc, data, len, partial);
|
|
kernel_fpu_end();
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/* Add padding and return the message digest. */
|
|
static int sha256_ssse3_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
|
unsigned int i, index, padlen;
|
|
__be32 *dst = (__be32 *)out;
|
|
__be64 bits;
|
|
static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
|
|
|
|
bits = cpu_to_be64(sctx->count << 3);
|
|
|
|
/* Pad out to 56 mod 64 and append length */
|
|
index = sctx->count % SHA256_BLOCK_SIZE;
|
|
padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56)-index);
|
|
|
|
if (!irq_fpu_usable()) {
|
|
crypto_sha256_update(desc, padding, padlen);
|
|
crypto_sha256_update(desc, (const u8 *)&bits, sizeof(bits));
|
|
} else {
|
|
kernel_fpu_begin();
|
|
/* We need to fill a whole block for __sha256_ssse3_update() */
|
|
if (padlen <= 56) {
|
|
sctx->count += padlen;
|
|
memcpy(sctx->buf + index, padding, padlen);
|
|
} else {
|
|
__sha256_ssse3_update(desc, padding, padlen, index);
|
|
}
|
|
__sha256_ssse3_update(desc, (const u8 *)&bits,
|
|
sizeof(bits), 56);
|
|
kernel_fpu_end();
|
|
}
|
|
|
|
/* Store state in digest */
|
|
for (i = 0; i < 8; i++)
|
|
dst[i] = cpu_to_be32(sctx->state[i]);
|
|
|
|
/* Wipe context */
|
|
memset(sctx, 0, sizeof(*sctx));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sha256_ssse3_export(struct shash_desc *desc, void *out)
|
|
{
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
|
|
|
memcpy(out, sctx, sizeof(*sctx));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sha256_ssse3_import(struct shash_desc *desc, const void *in)
|
|
{
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
|
|
|
memcpy(sctx, in, sizeof(*sctx));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sha224_ssse3_init(struct shash_desc *desc)
|
|
{
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
|
|
|
sctx->state[0] = SHA224_H0;
|
|
sctx->state[1] = SHA224_H1;
|
|
sctx->state[2] = SHA224_H2;
|
|
sctx->state[3] = SHA224_H3;
|
|
sctx->state[4] = SHA224_H4;
|
|
sctx->state[5] = SHA224_H5;
|
|
sctx->state[6] = SHA224_H6;
|
|
sctx->state[7] = SHA224_H7;
|
|
sctx->count = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sha224_ssse3_final(struct shash_desc *desc, u8 *hash)
|
|
{
|
|
u8 D[SHA256_DIGEST_SIZE];
|
|
|
|
sha256_ssse3_final(desc, D);
|
|
|
|
memcpy(hash, D, SHA224_DIGEST_SIZE);
|
|
memzero_explicit(D, SHA256_DIGEST_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg algs[] = { {
|
|
.digestsize = SHA256_DIGEST_SIZE,
|
|
.init = sha256_ssse3_init,
|
|
.update = sha256_ssse3_update,
|
|
.final = sha256_ssse3_final,
|
|
.export = sha256_ssse3_export,
|
|
.import = sha256_ssse3_import,
|
|
.descsize = sizeof(struct sha256_state),
|
|
.statesize = sizeof(struct sha256_state),
|
|
.base = {
|
|
.cra_name = "sha256",
|
|
.cra_driver_name = "sha256-ssse3",
|
|
.cra_priority = 150,
|
|
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
|
|
.cra_blocksize = SHA256_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
}, {
|
|
.digestsize = SHA224_DIGEST_SIZE,
|
|
.init = sha224_ssse3_init,
|
|
.update = sha256_ssse3_update,
|
|
.final = sha224_ssse3_final,
|
|
.export = sha256_ssse3_export,
|
|
.import = sha256_ssse3_import,
|
|
.descsize = sizeof(struct sha256_state),
|
|
.statesize = sizeof(struct sha256_state),
|
|
.base = {
|
|
.cra_name = "sha224",
|
|
.cra_driver_name = "sha224-ssse3",
|
|
.cra_priority = 150,
|
|
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
|
|
.cra_blocksize = SHA224_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 sha256_ssse3_mod_init(void)
|
|
{
|
|
/* test for SSSE3 first */
|
|
if (cpu_has_ssse3)
|
|
sha256_transform_asm = sha256_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) && boot_cpu_has(X86_FEATURE_BMI2))
|
|
sha256_transform_asm = sha256_transform_rorx;
|
|
else
|
|
#endif
|
|
sha256_transform_asm = sha256_transform_avx;
|
|
}
|
|
#endif
|
|
|
|
if (sha256_transform_asm) {
|
|
#ifdef CONFIG_AS_AVX
|
|
if (sha256_transform_asm == sha256_transform_avx)
|
|
pr_info("Using AVX optimized SHA-256 implementation\n");
|
|
#ifdef CONFIG_AS_AVX2
|
|
else if (sha256_transform_asm == sha256_transform_rorx)
|
|
pr_info("Using AVX2 optimized SHA-256 implementation\n");
|
|
#endif
|
|
else
|
|
#endif
|
|
pr_info("Using SSSE3 optimized SHA-256 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 sha256_ssse3_mod_fini(void)
|
|
{
|
|
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
|
|
}
|
|
|
|
module_init(sha256_ssse3_mod_init);
|
|
module_exit(sha256_ssse3_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm, Supplemental SSE3 accelerated");
|
|
|
|
MODULE_ALIAS_CRYPTO("sha256");
|
|
MODULE_ALIAS_CRYPTO("sha224");
|