crypto: sha256 - Create module providing optimized SHA256 routines using SSSE3, AVX or AVX2 instructions.

We added glue code and config options to create crypto
module that uses SSE/AVX/AVX2 optimized SHA256 x86_64 assembly routines.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 288 insertions, 0 deletions

diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index 83681a317422..9414b91b8f49 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_CRYPTO_GHASH_CLMUL_NI_INTEL) += ghash-clmulni-intel.o
 obj-$(CONFIG_CRYPTO_CRC32C_INTEL) += crc32c-intel.o
 obj-$(CONFIG_CRYPTO_SHA1_SSSE3) += sha1-ssse3.o
 obj-$(CONFIG_CRYPTO_CRC32_PCLMUL) += crc32-pclmul.o
+obj-$(CONFIG_CRYPTO_SHA256_SSSE3) += sha256-ssse3.o
 
 # These modules require assembler to support AVX.
 ifeq ($(avx_supported),yes)
@@ -66,3 +67,4 @@ sha1-ssse3-y := sha1_ssse3_asm.o sha1_ssse3_glue.o
 crc32c-intel-y := crc32c-intel_glue.o
 crc32c-intel-$(CONFIG_64BIT) += crc32c-pcl-intel-asm_64.o
 crc32-pclmul-y := crc32-pclmul_asm.o crc32-pclmul_glue.o
+sha256-ssse3-y := sha256-ssse3-asm.o sha256-avx-asm.o sha256-avx2-asm.o sha256_ssse3_glue.o
diff --git a/arch/x86/crypto/sha256_ssse3_glue.c b/arch/x86/crypto/sha256_ssse3_glue.c
new file mode 100644
index 000000000000..597d4da69656
--- /dev/null
+++ b/arch/x86/crypto/sha256_ssse3_glue.c
@@ -0,0 +1,275 @@
+/*
+ * 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 struct shash_alg alg = {
+        .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,
+        }
+};
+
+#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 SSE3 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))
+                        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_shash(&alg);
+        }
+        pr_info("Neither AVX nor SSSE3 is available/usable.\n");
+
+        return -ENODEV;
+}
+
+static void __exit sha256_ssse3_mod_fini(void)
+{
+        crypto_unregister_shash(&alg);
+}
+
+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("sha256");
diff --git a/crypto/Kconfig b/crypto/Kconfig
index aed52b2e4a55..8064ef1fedc4 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -470,6 +470,17 @@ config CRYPTO_SHA1_SSSE3
           using Supplemental SSE3 (SSSE3) instructions or Advanced Vector
           Extensions (AVX), when available.
 
+config CRYPTO_SHA256_SSSE3
+        tristate "SHA256 digest algorithm (SSSE3/AVX/AVX2)"
+        depends on X86 && 64BIT
+        select CRYPTO_SHA256
+        select CRYPTO_HASH
+        help
+          SHA-256 secure hash standard (DFIPS 180-2) implemented
+          using Supplemental SSE3 (SSSE3) instructions, or Advanced Vector
+          Extensions version 1 (AVX1), or Advanced Vector Extensions
+          version 2 (AVX2) instructions, when available.
+
 config CRYPTO_SHA1_SPARC64
         tristate "SHA1 digest algorithm (SPARC64)"
         depends on SPARC64