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/*
* Cryptographic API.
* Glue code for the SHA1 Secure Hash Algorithm assembler implementation
*
* This file is based on sha1_generic.c and sha1_ssse3_glue.c
*
* Copyright (c) Alan Smithee.
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
* Copyright (c) Mathias Krause <minipli@googlemail.com>
*
* 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 <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>
#include <asm/byteorder.h>
struct SHA1_CTX {
uint32_t h0,h1,h2,h3,h4;
u64 count;
u8 data[SHA1_BLOCK_SIZE];
};
asmlinkage void sha1_block_data_order(struct SHA1_CTX *digest,
const unsigned char *data, unsigned int rounds);
static int sha1_init(struct shash_desc *desc)
{
struct SHA1_CTX *sctx = shash_desc_ctx(desc);
memset(sctx, 0, sizeof(*sctx));
sctx->h0 = SHA1_H0;
sctx->h1 = SHA1_H1;
sctx->h2 = SHA1_H2;
sctx->h3 = SHA1_H3;
sctx->h4 = SHA1_H4;
return 0;
}
static int __sha1_update(struct SHA1_CTX *sctx, const u8 *data,
unsigned int len, unsigned int partial)
{
unsigned int done = 0;
sctx->count += len;
if (partial) {
done = SHA1_BLOCK_SIZE - partial;
memcpy(sctx->data + partial, data, done);
sha1_block_data_order(sctx, sctx->data, 1);
}
if (len - done >= SHA1_BLOCK_SIZE) {
const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
sha1_block_data_order(sctx, data + done, rounds);
done += rounds * SHA1_BLOCK_SIZE;
}
memcpy(sctx->data, data + done, len - done);
return 0;
}
static int sha1_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct SHA1_CTX *sctx = shash_desc_ctx(desc);
unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
int res;
/* Handle the fast case right here */
if (partial + len < SHA1_BLOCK_SIZE) {
sctx->count += len;
memcpy(sctx->data + partial, data, len);
return 0;
}
res = __sha1_update(sctx, data, len, partial);
return res;
}
/* Add padding and return the message digest. */
static int sha1_final(struct shash_desc *desc, u8 *out)
{
struct SHA1_CTX *sctx = shash_desc_ctx(desc);
unsigned int i, index, padlen;
__be32 *dst = (__be32 *)out;
__be64 bits;
static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
bits = cpu_to_be64(sctx->count << 3);
/* Pad out to 56 mod 64 and append length */
index = sctx->count % SHA1_BLOCK_SIZE;
padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
/* We need to fill a whole block for __sha1_update() */
if (padlen <= 56) {
sctx->count += padlen;
memcpy(sctx->data + index, padding, padlen);
} else {
__sha1_update(sctx, padding, padlen, index);
}
__sha1_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
/* Store state in digest */
for (i = 0; i < 5; i++)
dst[i] = cpu_to_be32(((u32 *)sctx)[i]);
/* Wipe context */
memset(sctx, 0, sizeof(*sctx));
return 0;
}
static int sha1_export(struct shash_desc *desc, void *out)
{
struct SHA1_CTX *sctx = shash_desc_ctx(desc);
memcpy(out, sctx, sizeof(*sctx));
return 0;
}
static int sha1_import(struct shash_desc *desc, const void *in)
{
struct SHA1_CTX *sctx = shash_desc_ctx(desc);
memcpy(sctx, in, sizeof(*sctx));
return 0;
}
static struct shash_alg alg = {
.digestsize = SHA1_DIGEST_SIZE,
.init = sha1_init,
.update = sha1_update,
.final = sha1_final,
.export = sha1_export,
.import = sha1_import,
.descsize = sizeof(struct SHA1_CTX),
.statesize = sizeof(struct SHA1_CTX),
.base = {
.cra_name = "sha1",
.cra_driver_name= "sha1-asm",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
static int __init sha1_mod_init(void)
{
return crypto_register_shash(&alg);
}
static void __exit sha1_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
module_init(sha1_mod_init);
module_exit(sha1_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (ARM)");
MODULE_ALIAS("sha1");
MODULE_AUTHOR("David McCullough <ucdevel@gmail.com>");
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