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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 <common.h>
#include <digest.h>
#include <init.h>
#include <crypto/sha.h>
#include <crypto/internal.h>
#include <asm/byteorder.h>
void sha1_block_data_order(u32 *digest,
const unsigned char *data, unsigned int rounds);
static int sha1_init(struct digest *desc)
{
struct sha1_state *sctx = digest_ctx(desc);
*sctx = (struct sha1_state){
.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
};
return 0;
}
static int __sha1_update(struct sha1_state *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->buffer + partial, data, done);
sha1_block_data_order(sctx->state, sctx->buffer, 1);
}
if (len - done >= SHA1_BLOCK_SIZE) {
const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
sha1_block_data_order(sctx->state, data + done, rounds);
done += rounds * SHA1_BLOCK_SIZE;
}
memcpy(sctx->buffer, data + done, len - done);
return 0;
}
int sha1_update_arm(struct digest *desc, const void *data,
unsigned long len)
{
struct sha1_state *sctx = digest_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->buffer + partial, data, len);
return 0;
}
res = __sha1_update(sctx, data, len, partial);
return res;
}
EXPORT_SYMBOL_GPL(sha1_update_arm);
/* Add padding and return the message digest. */
static int sha1_final(struct digest *desc, u8 *out)
{
struct sha1_state *sctx = digest_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->buffer + 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(sctx->state[i]);
/* Wipe context */
memset(sctx, 0, sizeof(*sctx));
return 0;
}
static struct digest_algo m = {
.base = {
.name = "sha1",
.driver_name = "sha1-asm",
.priority = 150,
.algo = HASH_ALGO_SHA1,
},
.init = sha1_init,
.update = sha1_update_arm,
.final = sha1_final,
.digest = digest_generic_digest,
.verify = digest_generic_verify,
.length = SHA1_DIGEST_SIZE,
.ctx_length = sizeof(struct sha1_state),
};
static int sha1_mod_init(void)
{
return digest_algo_register(&m);
}
coredevice_initcall(sha1_mod_init);
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