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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#include <asm/octeon/octeon.h>
#include <crypto/internal/hash.h>
#include <crypto/sha1.h>
#include <crypto/sha1_base.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.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(struct sha1_state *sctx, const u8 *src,
int blocks)
{
do {
const u64 *block = (const u64 *)src;
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]);
src += SHA1_BLOCK_SIZE;
} while (--blocks);
}
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;
int remain;
flags = octeon_crypto_enable(&state);
octeon_sha1_store_hash(sctx);
remain = sha1_base_do_update_blocks(desc, data, len,
octeon_sha1_transform);
octeon_sha1_read_hash(sctx);
octeon_crypto_disable(&state, flags);
return remain;
}
static int octeon_sha1_finup(struct shash_desc *desc, const u8 *src,
unsigned int len, u8 *out)
{
struct sha1_state *sctx = shash_desc_ctx(desc);
struct octeon_cop2_state state;
unsigned long flags;
flags = octeon_crypto_enable(&state);
octeon_sha1_store_hash(sctx);
sha1_base_do_finup(desc, src, len, octeon_sha1_transform);
octeon_sha1_read_hash(sctx);
octeon_crypto_disable(&state, flags);
return sha1_base_finish(desc, out);
}
static struct shash_alg octeon_sha1_alg = {
.digestsize = SHA1_DIGEST_SIZE,
.init = sha1_base_init,
.update = octeon_sha1_update,
.finup = octeon_sha1_finup,
.descsize = SHA1_STATE_SIZE,
.base = {
.cra_name = "sha1",
.cra_driver_name= "octeon-sha1",
.cra_priority = OCTEON_CR_OPCODE_PRIORITY,
.cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY,
.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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