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/*
* 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>");
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