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tag: v3.6-rc4
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/*
* Cryptographic API.
*
* SHA1 Secure Hash Algorithm.
*
* Derived from cryptoapi implementation, adapted for in-place
* scatterlist interface.
*
* 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 <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>
#include <asm/byteorder.h>

static int sha1_init(struct shash_desc *desc)
{
struct sha1_state *sctx = shash_desc_ctx(desc);

*sctx = (struct sha1_state){
.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
};

return 0;
}

int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha1_state *sctx = shash_desc_ctx(desc);
unsigned int partial, done;
const u8 *src;

partial = sctx->count % SHA1_BLOCK_SIZE;
sctx->count += len;
done = 0;
src = data;

if ((partial + len) >= SHA1_BLOCK_SIZE) {
u32 temp[SHA_WORKSPACE_WORDS];

if (partial) {
done = -partial;
memcpy(sctx->buffer + partial, data,
done + SHA1_BLOCK_SIZE);
src = sctx->buffer;
}

do {
sha_transform(sctx->state, src, temp);
done += SHA1_BLOCK_SIZE;
src = data + done;
} while (done + SHA1_BLOCK_SIZE <= len);

memset(temp, 0, sizeof(temp));
partial = 0;
}
memcpy(sctx->buffer + partial, src, len - done);

return 0;
}
EXPORT_SYMBOL(crypto_sha1_update);


/* Add padding and return the message digest. */
static int sha1_final(struct shash_desc *desc, u8 *out)
{
struct sha1_state *sctx = shash_desc_ctx(desc);
__be32 *dst = (__be32 *)out;
u32 i, index, padlen;
__be64 bits;
static const u8 padding[64] = { 0x80, };

bits = cpu_to_be64(sctx->count << 3);

/* Pad out to 56 mod 64 */
index = sctx->count & 0x3f;
padlen = (index < 56) ? (56 - index) : ((64+56) - index);
crypto_sha1_update(desc, padding, padlen);

/* Append length */
crypto_sha1_update(desc, (const u8 *)&bits, sizeof(bits));

/* 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 int 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 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 alg = {
.digestsize = SHA1_DIGEST_SIZE,
.init = sha1_init,
.update = crypto_sha1_update,
.final = sha1_final,
.export = sha1_export,
.import = sha1_import,
.descsize = sizeof(struct sha1_state),
.statesize = sizeof(struct sha1_state),
.base = {
.cra_name = "sha1",
.cra_driver_name= "sha1-generic",
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};

static int __init sha1_generic_mod_init(void)
{
return crypto_register_shash(&alg);
}

static void __exit sha1_generic_mod_fini(void)
{
crypto_unregister_shash(&alg);
}

module_init(sha1_generic_mod_init);
module_exit(sha1_generic_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");

MODULE_ALIAS("sha1");
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