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*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see http://www.gnu.org/licenses
*
* Please visit http://www.xyratex.com/contact if you need additional
* information or have any questions.
*
* GPL HEADER END
*/
/*
* Copyright 2012 Xyratex Technology Limited
*/
/*
* This is crypto api shash wrappers to zlib_adler32.
*/
#include <linux/module.h>
#include <linux/zutil.h>
#include <crypto/internal/hash.h>
#define CHKSUM_BLOCK_SIZE 1
#define CHKSUM_DIGEST_SIZE 4
static u32 __adler32(u32 cksum, unsigned char const *p, size_t len)
{
return zlib_adler32(cksum, p, len);
}
static int adler32_cra_init(struct crypto_tfm *tfm)
{
u32 *key = crypto_tfm_ctx(tfm);
*key = 1;
return 0;
}
static int adler32_setkey(struct crypto_shash *hash, const u8 *key,
unsigned int keylen)
{
u32 *mctx = crypto_shash_ctx(hash);
if (keylen != sizeof(u32)) {
crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
*mctx = *(u32 *)key;
return 0;
}
static int adler32_init(struct shash_desc *desc)
{
u32 *mctx = crypto_shash_ctx(desc->tfm);
u32 *cksump = shash_desc_ctx(desc);
*cksump = *mctx;
return 0;
}
static int adler32_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
u32 *cksump = shash_desc_ctx(desc);
*cksump = __adler32(*cksump, data, len);
return 0;
}
static int __adler32_finup(u32 *cksump, const u8 *data, unsigned int len,
u8 *out)
{
*(u32 *)out = __adler32(*cksump, data, len);
return 0;
}
static int adler32_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return __adler32_finup(shash_desc_ctx(desc), data, len, out);
}
static int adler32_final(struct shash_desc *desc, u8 *out)
{
u32 *cksump = shash_desc_ctx(desc);
*(u32 *)out = *cksump;
return 0;
}
static int adler32_digest(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return __adler32_finup(crypto_shash_ctx(desc->tfm), data, len,
out);
}
static struct shash_alg alg = {
.setkey = adler32_setkey,
.init = adler32_init,
.update = adler32_update,
.final = adler32_final,
.finup = adler32_finup,
.digest = adler32_digest,
.descsize = sizeof(u32),
.digestsize = CHKSUM_DIGEST_SIZE,
.base = {
.cra_name = "adler32",
.cra_driver_name = "adler32-zlib",
.cra_priority = 100,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
.cra_init = adler32_cra_init,
}
};
int cfs_crypto_adler32_register(void)
{
return crypto_register_shash(&alg);
}
EXPORT_SYMBOL(cfs_crypto_adler32_register);
void cfs_crypto_adler32_unregister(void)
{
crypto_unregister_shash(&alg);
}
EXPORT_SYMBOL(cfs_crypto_adler32_unregister);
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