1 files changed, 197 insertions, 0 deletions

diff --git a/arch/arm/crypto/sha1_neon_glue.c b/arch/arm/crypto/sha1_neon_glue.c
new file mode 100644
index 000000000000..6f1b411b1d55
--- /dev/null
+++ b/arch/arm/crypto/sha1_neon_glue.c
@@ -0,0 +1,197 @@
+/*
+ * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
+ * ARM NEON instructions.
+ *
+ * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
+ *
+ * This file is based on sha1_generic.c and sha1_ssse3_glue.c:
+ *  Copyright (c) Alan Smithee.
+ *  Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ *  Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
+ *  Copyright (c) Mathias Krause <minipli@googlemail.com>
+ *  Copyright (c) Chandramouli Narayanan <mouli@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.
+ *
+ */
+
+#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/neon.h>
+#include <asm/simd.h>
+#include <asm/crypto/sha1.h>
+
+
+asmlinkage void sha1_transform_neon(void *state_h, const char *data,
+                                    unsigned int rounds);
+
+
+static int sha1_neon_init(struct shash_desc *desc)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+
+        *sctx = (struct sha1_state){
+                .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
+        };
+
+        return 0;
+}
+
+static int __sha1_neon_update(struct shash_desc *desc, const u8 *data,
+                               unsigned int len, unsigned int partial)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+        unsigned int done = 0;
+
+        sctx->count += len;
+
+        if (partial) {
+                done = SHA1_BLOCK_SIZE - partial;
+                memcpy(sctx->buffer + partial, data, done);
+                sha1_transform_neon(sctx->state, sctx->buffer, 1);
+        }
+
+        if (len - done >= SHA1_BLOCK_SIZE) {
+                const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
+
+                sha1_transform_neon(sctx->state, data + done, rounds);
+                done += rounds * SHA1_BLOCK_SIZE;
+        }
+
+        memcpy(sctx->buffer, data + done, len - done);
+
+        return 0;
+}
+
+static int sha1_neon_update(struct shash_desc *desc, const u8 *data,
+                             unsigned int len)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+        unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
+        int res;
+
+        /* Handle the fast case right here */
+        if (partial + len < SHA1_BLOCK_SIZE) {
+                sctx->count += len;
+                memcpy(sctx->buffer + partial, data, len);
+
+                return 0;
+        }
+
+        if (!may_use_simd()) {
+                res = sha1_update_arm(desc, data, len);
+        } else {
+                kernel_neon_begin();
+                res = __sha1_neon_update(desc, data, len, partial);
+                kernel_neon_end();
+        }
+
+        return res;
+}
+
+
+/* Add padding and return the message digest. */
+static int sha1_neon_final(struct shash_desc *desc, u8 *out)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+        unsigned int i, index, padlen;
+        __be32 *dst = (__be32 *)out;
+        __be64 bits;
+        static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
+
+        bits = cpu_to_be64(sctx->count << 3);
+
+        /* Pad out to 56 mod 64 and append length */
+        index = sctx->count % SHA1_BLOCK_SIZE;
+        padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
+        if (!may_use_simd()) {
+                sha1_update_arm(desc, padding, padlen);
+                sha1_update_arm(desc, (const u8 *)&bits, sizeof(bits));
+        } else {
+                kernel_neon_begin();
+                /* We need to fill a whole block for __sha1_neon_update() */
+                if (padlen <= 56) {
+                        sctx->count += padlen;
+                        memcpy(sctx->buffer + index, padding, padlen);
+                } else {
+                        __sha1_neon_update(desc, padding, padlen, index);
+                }
+                __sha1_neon_update(desc, (const u8 *)&bits, sizeof(bits), 56);
+                kernel_neon_end();
+        }
+
+        /* Store state in digest */
+        for (i = 0; i < 5; i++)
+                dst[i] = cpu_to_be32(sctx->state[i]);
+
+        /* Wipe context */
+        memset(sctx, 0, sizeof(*sctx));
+
+        return 0;
+}
+
+static int sha1_neon_export(struct shash_desc *desc, void *out)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+
+        memcpy(out, sctx, sizeof(*sctx));
+
+        return 0;
+}
+
+static int sha1_neon_import(struct shash_desc *desc, const void *in)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+
+        memcpy(sctx, in, sizeof(*sctx));
+
+        return 0;
+}
+
+static struct shash_alg alg = {
+        .digestsize     =       SHA1_DIGEST_SIZE,
+        .init           =       sha1_neon_init,
+        .update         =       sha1_neon_update,
+        .final          =       sha1_neon_final,
+        .export         =       sha1_neon_export,
+        .import         =       sha1_neon_import,
+        .descsize       =       sizeof(struct sha1_state),
+        .statesize      =       sizeof(struct sha1_state),
+        .base           =       {
+                .cra_name               = "sha1",
+                .cra_driver_name        = "sha1-neon",
+                .cra_priority           = 250,
+                .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
+                .cra_blocksize          = SHA1_BLOCK_SIZE,
+                .cra_module             = THIS_MODULE,
+        }
+};
+
+static int __init sha1_neon_mod_init(void)
+{
+        if (!cpu_has_neon())
+                return -ENODEV;
+
+        return crypto_register_shash(&alg);
+}
+
+static void __exit sha1_neon_mod_fini(void)
+{
+        crypto_unregister_shash(&alg);
+}
+
+module_init(sha1_neon_mod_init);
+module_exit(sha1_neon_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
+MODULE_ALIAS("sha1");