crypto: octeon - add SHA1 module

Add OCTEON SHA1 module.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 243 insertions, 1 deletions

diff --git a/arch/mips/cavium-octeon/crypto/Makefile b/arch/mips/cavium-octeon/crypto/Makefile
index a74f76d85a2f..3f671d60a3d9 100644
--- a/arch/mips/cavium-octeon/crypto/Makefile
+++ b/arch/mips/cavium-octeon/crypto/Makefile
@@ -4,4 +4,5 @@
 
 obj-y += octeon-crypto.o
 
-obj-$(CONFIG_CRYPTO_MD5_OCTEON) += octeon-md5.o
+obj-$(CONFIG_CRYPTO_MD5_OCTEON)         += octeon-md5.o
+obj-$(CONFIG_CRYPTO_SHA1_OCTEON)        += octeon-sha1.o
diff --git a/arch/mips/cavium-octeon/crypto/octeon-sha1.c b/arch/mips/cavium-octeon/crypto/octeon-sha1.c
new file mode 100644
index 000000000000..2b74b5b67cae
--- /dev/null
+++ b/arch/mips/cavium-octeon/crypto/octeon-sha1.c
@@ -0,0 +1,241 @@
+/*
+ * Cryptographic API.
+ *
+ * SHA1 Secure Hash Algorithm.
+ *
+ * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
+ *
+ * Based on crypto/sha1_generic.c, which is:
+ *
+ * Copyright (c) Alan Smithee.
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
+ *
+ * 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 <linux/mm.h>
+#include <crypto/sha.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <asm/byteorder.h>
+#include <asm/octeon/octeon.h>
+#include <crypto/internal/hash.h>
+
+#include "octeon-crypto.h"
+
+/*
+ * We pass everything as 64-bit. OCTEON can handle misaligned data.
+ */
+
+static void octeon_sha1_store_hash(struct sha1_state *sctx)
+{
+        u64 *hash = (u64 *)sctx->state;
+        union {
+                u32 word[2];
+                u64 dword;
+        } hash_tail = { { sctx->state[4], } };
+
+        write_octeon_64bit_hash_dword(hash[0], 0);
+        write_octeon_64bit_hash_dword(hash[1], 1);
+        write_octeon_64bit_hash_dword(hash_tail.dword, 2);
+        memzero_explicit(&hash_tail.word[0], sizeof(hash_tail.word[0]));
+}
+
+static void octeon_sha1_read_hash(struct sha1_state *sctx)
+{
+        u64 *hash = (u64 *)sctx->state;
+        union {
+                u32 word[2];
+                u64 dword;
+        } hash_tail;
+
+        hash[0]         = read_octeon_64bit_hash_dword(0);
+        hash[1]         = read_octeon_64bit_hash_dword(1);
+        hash_tail.dword = read_octeon_64bit_hash_dword(2);
+        sctx->state[4]  = hash_tail.word[0];
+        memzero_explicit(&hash_tail.dword, sizeof(hash_tail.dword));
+}
+
+static void octeon_sha1_transform(const void *_block)
+{
+        const u64 *block = _block;
+
+        write_octeon_64bit_block_dword(block[0], 0);
+        write_octeon_64bit_block_dword(block[1], 1);
+        write_octeon_64bit_block_dword(block[2], 2);
+        write_octeon_64bit_block_dword(block[3], 3);
+        write_octeon_64bit_block_dword(block[4], 4);
+        write_octeon_64bit_block_dword(block[5], 5);
+        write_octeon_64bit_block_dword(block[6], 6);
+        octeon_sha1_start(block[7]);
+}
+
+static int octeon_sha1_init(struct shash_desc *desc)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+
+        sctx->state[0] = SHA1_H0;
+        sctx->state[1] = SHA1_H1;
+        sctx->state[2] = SHA1_H2;
+        sctx->state[3] = SHA1_H3;
+        sctx->state[4] = SHA1_H4;
+        sctx->count = 0;
+
+        return 0;
+}
+
+static void __octeon_sha1_update(struct sha1_state *sctx, const u8 *data,
+                                 unsigned int len)
+{
+        unsigned int partial;
+        unsigned int done;
+        const u8 *src;
+
+        partial = sctx->count % SHA1_BLOCK_SIZE;
+        sctx->count += len;
+        done = 0;
+        src = data;
+
+        if ((partial + len) >= SHA1_BLOCK_SIZE) {
+                if (partial) {
+                        done = -partial;
+                        memcpy(sctx->buffer + partial, data,
+                               done + SHA1_BLOCK_SIZE);
+                        src = sctx->buffer;
+                }
+
+                do {
+                        octeon_sha1_transform(src);
+                        done += SHA1_BLOCK_SIZE;
+                        src = data + done;
+                } while (done + SHA1_BLOCK_SIZE <= len);
+
+                partial = 0;
+        }
+        memcpy(sctx->buffer + partial, src, len - done);
+}
+
+static int octeon_sha1_update(struct shash_desc *desc, const u8 *data,
+                        unsigned int len)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+        struct octeon_cop2_state state;
+        unsigned long flags;
+
+        /*
+         * Small updates never reach the crypto engine, so the generic sha1 is
+         * faster because of the heavyweight octeon_crypto_enable() /
+         * octeon_crypto_disable().
+         */
+        if ((sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
+                return crypto_sha1_update(desc, data, len);
+
+        flags = octeon_crypto_enable(&state);
+        octeon_sha1_store_hash(sctx);
+
+        __octeon_sha1_update(sctx, data, len);
+
+        octeon_sha1_read_hash(sctx);
+        octeon_crypto_disable(&state, flags);
+
+        return 0;
+}
+
+static int octeon_sha1_final(struct shash_desc *desc, u8 *out)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+        static const u8 padding[64] = { 0x80, };
+        struct octeon_cop2_state state;
+        __be32 *dst = (__be32 *)out;
+        unsigned int pad_len;
+        unsigned long flags;
+        unsigned int index;
+        __be64 bits;
+        int i;
+
+        /* Save number of bits. */
+        bits = cpu_to_be64(sctx->count << 3);
+
+        /* Pad out to 56 mod 64. */
+        index = sctx->count & 0x3f;
+        pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
+
+        flags = octeon_crypto_enable(&state);
+        octeon_sha1_store_hash(sctx);
+
+        __octeon_sha1_update(sctx, padding, pad_len);
+
+        /* Append length (before padding). */
+        __octeon_sha1_update(sctx, (const u8 *)&bits, sizeof(bits));
+
+        octeon_sha1_read_hash(sctx);
+        octeon_crypto_disable(&state, flags);
+
+        /* Store state in digest */
+        for (i = 0; i < 5; i++)
+                dst[i] = cpu_to_be32(sctx->state[i]);
+
+        /* Zeroize sensitive information. */
+        memset(sctx, 0, sizeof(*sctx));
+
+        return 0;
+}
+
+static int octeon_sha1_export(struct shash_desc *desc, void *out)
+{
+        struct sha1_state *sctx = shash_desc_ctx(desc);
+
+        memcpy(out, sctx, sizeof(*sctx));
+        return 0;
+}
+
+static int octeon_sha1_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 octeon_sha1_alg = {
+        .digestsize     =       SHA1_DIGEST_SIZE,
+        .init           =       octeon_sha1_init,
+        .update         =       octeon_sha1_update,
+        .final          =       octeon_sha1_final,
+        .export         =       octeon_sha1_export,
+        .import         =       octeon_sha1_import,
+        .descsize       =       sizeof(struct sha1_state),
+        .statesize      =       sizeof(struct sha1_state),
+        .base           =       {
+                .cra_name       =       "sha1",
+                .cra_driver_name=       "octeon-sha1",
+                .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
+                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
+                .cra_blocksize  =       SHA1_BLOCK_SIZE,
+                .cra_module     =       THIS_MODULE,
+        }
+};
+
+static int __init octeon_sha1_mod_init(void)
+{
+        if (!octeon_has_crypto())
+                return -ENOTSUPP;
+        return crypto_register_shash(&octeon_sha1_alg);
+}
+
+static void __exit octeon_sha1_mod_fini(void)
+{
+        crypto_unregister_shash(&octeon_sha1_alg);
+}
+
+module_init(octeon_sha1_mod_init);
+module_exit(octeon_sha1_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (OCTEON)");
+MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");