arm/crypto: Add optimized AES and SHA1 routines

Add assembler versions of AES and SHA1 for ARM platforms.  This has provided
up to a 50% improvement in IPsec/TCP throughout for tunnels using AES128/SHA1.

Platform   CPU SPeed    Endian   Before (bps)   After (bps)   Improvement

IXP425      533 MHz      big     11217042        15566294        ~38%
KS8695      166 MHz     little    3828549         5795373        ~51%

Signed-off-by: David McCullough <ucdevel@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 179 insertions, 0 deletions

diff --git a/arch/arm/crypto/sha1_glue.c b/arch/arm/crypto/sha1_glue.c
new file mode 100644
index 000000000000..76cd976230bc
--- /dev/null
+++ b/arch/arm/crypto/sha1_glue.c
@@ -0,0 +1,179 @@
+/*
+ * Cryptographic API.
+ * Glue code for the SHA1 Secure Hash Algorithm assembler implementation
+ *
+ * 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>
+ *
+ * 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/cryptohash.h>
+#include <linux/types.h>
+#include <crypto/sha.h>
+#include <asm/byteorder.h>
+
+struct SHA1_CTX {
+	uint32_t h0,h1,h2,h3,h4;
+	u64 count;
+	u8 data[SHA1_BLOCK_SIZE];
+};
+
+asmlinkage void sha1_block_data_order(struct SHA1_CTX *digest,
+		const unsigned char *data, unsigned int rounds);
+
+
+static int sha1_init(struct shash_desc *desc)
+{
+	struct SHA1_CTX *sctx = shash_desc_ctx(desc);
+	memset(sctx, 0, sizeof(*sctx));
+	sctx->h0 = SHA1_H0;
+	sctx->h1 = SHA1_H1;
+	sctx->h2 = SHA1_H2;
+	sctx->h3 = SHA1_H3;
+	sctx->h4 = SHA1_H4;
+	return 0;
+}
+
+
+static int __sha1_update(struct SHA1_CTX *sctx, const u8 *data,
+			       unsigned int len, unsigned int partial)
+{
+	unsigned int done = 0;
+
+	sctx->count += len;
+
+	if (partial) {
+		done = SHA1_BLOCK_SIZE - partial;
+		memcpy(sctx->data + partial, data, done);
+		sha1_block_data_order(sctx, sctx->data, 1);
+	}
+
+	if (len - done >= SHA1_BLOCK_SIZE) {
+		const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
+		sha1_block_data_order(sctx, data + done, rounds);
+		done += rounds * SHA1_BLOCK_SIZE;
+	}
+
+	memcpy(sctx->data, data + done, len - done);
+	return 0;
+}
+
+
+static int sha1_update(struct shash_desc *desc, const u8 *data,
+			     unsigned int len)
+{
+	struct SHA1_CTX *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->data + partial, data, len);
+		return 0;
+	}
+	res = __sha1_update(sctx, data, len, partial);
+	return res;
+}
+
+
+/* Add padding and return the message digest. */
+static int sha1_final(struct shash_desc *desc, u8 *out)
+{
+	struct SHA1_CTX *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);
+	/* We need to fill a whole block for __sha1_update() */
+	if (padlen <= 56) {
+		sctx->count += padlen;
+		memcpy(sctx->data + index, padding, padlen);
+	} else {
+		__sha1_update(sctx, padding, padlen, index);
+	}
+	__sha1_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
+
+	/* Store state in digest */
+	for (i = 0; i < 5; i++)
+		dst[i] = cpu_to_be32(((u32 *)sctx)[i]);
+
+	/* Wipe context */
+	memset(sctx, 0, sizeof(*sctx));
+	return 0;
+}
+
+
+static int sha1_export(struct shash_desc *desc, void *out)
+{
+	struct SHA1_CTX *sctx = shash_desc_ctx(desc);
+	memcpy(out, sctx, sizeof(*sctx));
+	return 0;
+}
+
+
+static int sha1_import(struct shash_desc *desc, const void *in)
+{
+	struct SHA1_CTX *sctx = shash_desc_ctx(desc);
+	memcpy(sctx, in, sizeof(*sctx));
+	return 0;
+}
+
+
+static struct shash_alg alg = {
+	.digestsize	=	SHA1_DIGEST_SIZE,
+	.init		=	sha1_init,
+	.update		=	sha1_update,
+	.final		=	sha1_final,
+	.export		=	sha1_export,
+	.import		=	sha1_import,
+	.descsize	=	sizeof(struct SHA1_CTX),
+	.statesize	=	sizeof(struct SHA1_CTX),
+	.base		=	{
+		.cra_name	=	"sha1",
+		.cra_driver_name=	"sha1-asm",
+		.cra_priority	=	150,
+		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
+		.cra_blocksize	=	SHA1_BLOCK_SIZE,
+		.cra_module	=	THIS_MODULE,
+	}
+};
+
+
+static int __init sha1_mod_init(void)
+{
+	return crypto_register_shash(&alg);
+}
+
+
+static void __exit sha1_mod_fini(void)
+{
+	crypto_unregister_shash(&alg);
+}
+
+
+module_init(sha1_mod_init);
+module_exit(sha1_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (ARM)");
+MODULE_ALIAS("sha1");
+MODULE_AUTHOR("David McCullough <ucdevel@gmail.com>");