CRYPTO: Octeon: Add SHA512 module

Add OCTEON SHA512 module.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9496/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 278 insertions, 0 deletions

diff --git a/arch/mips/cavium-octeon/crypto/Makefile b/arch/mips/cavium-octeon/crypto/Makefile
index 47806a5c5d71..f7aa9d5d3b87 100644
--- a/arch/mips/cavium-octeon/crypto/Makefile
+++ b/arch/mips/cavium-octeon/crypto/Makefile
@@ -7,3 +7,4 @@ obj-y += octeon-crypto.o
 obj-$(CONFIG_CRYPTO_MD5_OCTEON)         += octeon-md5.o
 obj-$(CONFIG_CRYPTO_SHA1_OCTEON)        += octeon-sha1.o
 obj-$(CONFIG_CRYPTO_SHA256_OCTEON)      += octeon-sha256.o
+obj-$(CONFIG_CRYPTO_SHA512_OCTEON)      += octeon-sha512.o
diff --git a/arch/mips/cavium-octeon/crypto/octeon-sha512.c b/arch/mips/cavium-octeon/crypto/octeon-sha512.c
new file mode 100644
index 000000000000..d5fb3c6f22ae
--- /dev/null
+++ b/arch/mips/cavium-octeon/crypto/octeon-sha512.c
@@ -0,0 +1,277 @@
+/*
+ * Cryptographic API.
+ *
+ * SHA-512 and SHA-384 Secure Hash Algorithm.
+ *
+ * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
+ *
+ * Based on crypto/sha512_generic.c, which is:
+ *
+ * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) 2003 Kyle McMartin <kyle@debian.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, 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_sha512_store_hash(struct sha512_state *sctx)
+{
+        write_octeon_64bit_hash_sha512(sctx->state[0], 0);
+        write_octeon_64bit_hash_sha512(sctx->state[1], 1);
+        write_octeon_64bit_hash_sha512(sctx->state[2], 2);
+        write_octeon_64bit_hash_sha512(sctx->state[3], 3);
+        write_octeon_64bit_hash_sha512(sctx->state[4], 4);
+        write_octeon_64bit_hash_sha512(sctx->state[5], 5);
+        write_octeon_64bit_hash_sha512(sctx->state[6], 6);
+        write_octeon_64bit_hash_sha512(sctx->state[7], 7);
+}
+
+static void octeon_sha512_read_hash(struct sha512_state *sctx)
+{
+        sctx->state[0] = read_octeon_64bit_hash_sha512(0);
+        sctx->state[1] = read_octeon_64bit_hash_sha512(1);
+        sctx->state[2] = read_octeon_64bit_hash_sha512(2);
+        sctx->state[3] = read_octeon_64bit_hash_sha512(3);
+        sctx->state[4] = read_octeon_64bit_hash_sha512(4);
+        sctx->state[5] = read_octeon_64bit_hash_sha512(5);
+        sctx->state[6] = read_octeon_64bit_hash_sha512(6);
+        sctx->state[7] = read_octeon_64bit_hash_sha512(7);
+}
+
+static void octeon_sha512_transform(const void *_block)
+{
+        const u64 *block = _block;
+
+        write_octeon_64bit_block_sha512(block[0], 0);
+        write_octeon_64bit_block_sha512(block[1], 1);
+        write_octeon_64bit_block_sha512(block[2], 2);
+        write_octeon_64bit_block_sha512(block[3], 3);
+        write_octeon_64bit_block_sha512(block[4], 4);
+        write_octeon_64bit_block_sha512(block[5], 5);
+        write_octeon_64bit_block_sha512(block[6], 6);
+        write_octeon_64bit_block_sha512(block[7], 7);
+        write_octeon_64bit_block_sha512(block[8], 8);
+        write_octeon_64bit_block_sha512(block[9], 9);
+        write_octeon_64bit_block_sha512(block[10], 10);
+        write_octeon_64bit_block_sha512(block[11], 11);
+        write_octeon_64bit_block_sha512(block[12], 12);
+        write_octeon_64bit_block_sha512(block[13], 13);
+        write_octeon_64bit_block_sha512(block[14], 14);
+        octeon_sha512_start(block[15]);
+}
+
+static int octeon_sha512_init(struct shash_desc *desc)
+{
+        struct sha512_state *sctx = shash_desc_ctx(desc);
+
+        sctx->state[0] = SHA512_H0;
+        sctx->state[1] = SHA512_H1;
+        sctx->state[2] = SHA512_H2;
+        sctx->state[3] = SHA512_H3;
+        sctx->state[4] = SHA512_H4;
+        sctx->state[5] = SHA512_H5;
+        sctx->state[6] = SHA512_H6;
+        sctx->state[7] = SHA512_H7;
+        sctx->count[0] = sctx->count[1] = 0;
+
+        return 0;
+}
+
+static int octeon_sha384_init(struct shash_desc *desc)
+{
+        struct sha512_state *sctx = shash_desc_ctx(desc);
+
+        sctx->state[0] = SHA384_H0;
+        sctx->state[1] = SHA384_H1;
+        sctx->state[2] = SHA384_H2;
+        sctx->state[3] = SHA384_H3;
+        sctx->state[4] = SHA384_H4;
+        sctx->state[5] = SHA384_H5;
+        sctx->state[6] = SHA384_H6;
+        sctx->state[7] = SHA384_H7;
+        sctx->count[0] = sctx->count[1] = 0;
+
+        return 0;
+}
+
+static void __octeon_sha512_update(struct sha512_state *sctx, const u8 *data,
+                                   unsigned int len)
+{
+        unsigned int part_len;
+        unsigned int index;
+        unsigned int i;
+
+        /* Compute number of bytes mod 128. */
+        index = sctx->count[0] % SHA512_BLOCK_SIZE;
+
+        /* Update number of bytes. */
+        if ((sctx->count[0] += len) < len)
+                sctx->count[1]++;
+
+        part_len = SHA512_BLOCK_SIZE - index;
+
+        /* Transform as many times as possible. */
+        if (len >= part_len) {
+                memcpy(&sctx->buf[index], data, part_len);
+                octeon_sha512_transform(sctx->buf);
+
+                for (i = part_len; i + SHA512_BLOCK_SIZE <= len;
+                        i += SHA512_BLOCK_SIZE)
+                        octeon_sha512_transform(&data[i]);
+
+                index = 0;
+        } else {
+                i = 0;
+        }
+
+        /* Buffer remaining input. */
+        memcpy(&sctx->buf[index], &data[i], len - i);
+}
+
+static int octeon_sha512_update(struct shash_desc *desc, const u8 *data,
+                                unsigned int len)
+{
+        struct sha512_state *sctx = shash_desc_ctx(desc);
+        struct octeon_cop2_state state;
+        unsigned long flags;
+
+        /*
+         * Small updates never reach the crypto engine, so the generic sha512 is
+         * faster because of the heavyweight octeon_crypto_enable() /
+         * octeon_crypto_disable().
+         */
+        if ((sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
+                return crypto_sha512_update(desc, data, len);
+
+        flags = octeon_crypto_enable(&state);
+        octeon_sha512_store_hash(sctx);
+
+        __octeon_sha512_update(sctx, data, len);
+
+        octeon_sha512_read_hash(sctx);
+        octeon_crypto_disable(&state, flags);
+
+        return 0;
+}
+
+static int octeon_sha512_final(struct shash_desc *desc, u8 *hash)
+{
+        struct sha512_state *sctx = shash_desc_ctx(desc);
+        static u8 padding[128] = { 0x80, };
+        struct octeon_cop2_state state;
+        __be64 *dst = (__be64 *)hash;
+        unsigned int pad_len;
+        unsigned long flags;
+        unsigned int index;
+        __be64 bits[2];
+        int i;
+
+        /* Save number of bits. */
+        bits[1] = cpu_to_be64(sctx->count[0] << 3);
+        bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
+
+        /* Pad out to 112 mod 128. */
+        index = sctx->count[0] & 0x7f;
+        pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
+
+        flags = octeon_crypto_enable(&state);
+        octeon_sha512_store_hash(sctx);
+
+        __octeon_sha512_update(sctx, padding, pad_len);
+
+        /* Append length (before padding). */
+        __octeon_sha512_update(sctx, (const u8 *)bits, sizeof(bits));
+
+        octeon_sha512_read_hash(sctx);
+        octeon_crypto_disable(&state, flags);
+
+        /* Store state in digest. */
+        for (i = 0; i < 8; i++)
+                dst[i] = cpu_to_be64(sctx->state[i]);
+
+        /* Zeroize sensitive information. */
+        memset(sctx, 0, sizeof(struct sha512_state));
+
+        return 0;
+}
+
+static int octeon_sha384_final(struct shash_desc *desc, u8 *hash)
+{
+        u8 D[64];
+
+        octeon_sha512_final(desc, D);
+
+        memcpy(hash, D, 48);
+        memzero_explicit(D, 64);
+
+        return 0;
+}
+
+static struct shash_alg octeon_sha512_algs[2] = { {
+        .digestsize     =       SHA512_DIGEST_SIZE,
+        .init           =       octeon_sha512_init,
+        .update         =       octeon_sha512_update,
+        .final          =       octeon_sha512_final,
+        .descsize       =       sizeof(struct sha512_state),
+        .base           =       {
+                .cra_name       =       "sha512",
+                .cra_driver_name=       "octeon-sha512",
+                .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
+                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
+                .cra_blocksize  =       SHA512_BLOCK_SIZE,
+                .cra_module     =       THIS_MODULE,
+        }
+}, {
+        .digestsize     =       SHA384_DIGEST_SIZE,
+        .init           =       octeon_sha384_init,
+        .update         =       octeon_sha512_update,
+        .final          =       octeon_sha384_final,
+        .descsize       =       sizeof(struct sha512_state),
+        .base           =       {
+                .cra_name       =       "sha384",
+                .cra_driver_name=       "octeon-sha384",
+                .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
+                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
+                .cra_blocksize  =       SHA384_BLOCK_SIZE,
+                .cra_module     =       THIS_MODULE,
+        }
+} };
+
+static int __init octeon_sha512_mod_init(void)
+{
+        if (!octeon_has_crypto())
+                return -ENOTSUPP;
+        return crypto_register_shashes(octeon_sha512_algs,
+                                       ARRAY_SIZE(octeon_sha512_algs));
+}
+
+static void __exit octeon_sha512_mod_fini(void)
+{
+        crypto_unregister_shashes(octeon_sha512_algs,
+                                  ARRAY_SIZE(octeon_sha512_algs));
+}
+
+module_init(octeon_sha512_mod_init);
+module_exit(octeon_sha512_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms (OCTEON)");
+MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");