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/*
* 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>");
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