mirror of https://gitee.com/openkylin/linux.git
133 lines
2.8 KiB
C
133 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright 2012 Xyratex Technology Limited
|
|
*/
|
|
|
|
/*
|
|
* This is crypto api shash wrappers to crc32_le.
|
|
*/
|
|
|
|
#include <asm/unaligned.h>
|
|
#include <linux/crc32.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#define CHKSUM_BLOCK_SIZE 1
|
|
#define CHKSUM_DIGEST_SIZE 4
|
|
|
|
/** No default init with ~0 */
|
|
static int crc32_cra_init(struct crypto_tfm *tfm)
|
|
{
|
|
u32 *key = crypto_tfm_ctx(tfm);
|
|
|
|
*key = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Setting the seed allows arbitrary accumulators and flexible XOR policy
|
|
* If your algorithm starts with ~0, then XOR with ~0 before you set
|
|
* the seed.
|
|
*/
|
|
static int crc32_setkey(struct crypto_shash *hash, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
u32 *mctx = crypto_shash_ctx(hash);
|
|
|
|
if (keylen != sizeof(u32))
|
|
return -EINVAL;
|
|
*mctx = get_unaligned_le32(key);
|
|
return 0;
|
|
}
|
|
|
|
static int crc32_init(struct shash_desc *desc)
|
|
{
|
|
u32 *mctx = crypto_shash_ctx(desc->tfm);
|
|
u32 *crcp = shash_desc_ctx(desc);
|
|
|
|
*crcp = *mctx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crc32_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len)
|
|
{
|
|
u32 *crcp = shash_desc_ctx(desc);
|
|
|
|
*crcp = crc32_le(*crcp, data, len);
|
|
return 0;
|
|
}
|
|
|
|
/* No final XOR 0xFFFFFFFF, like crc32_le */
|
|
static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len,
|
|
u8 *out)
|
|
{
|
|
put_unaligned_le32(crc32_le(*crcp, data, len), out);
|
|
return 0;
|
|
}
|
|
|
|
static int crc32_finup(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
return __crc32_finup(shash_desc_ctx(desc), data, len, out);
|
|
}
|
|
|
|
static int crc32_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
u32 *crcp = shash_desc_ctx(desc);
|
|
|
|
put_unaligned_le32(*crcp, out);
|
|
return 0;
|
|
}
|
|
|
|
static int crc32_digest(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len,
|
|
out);
|
|
}
|
|
static struct shash_alg alg = {
|
|
.setkey = crc32_setkey,
|
|
.init = crc32_init,
|
|
.update = crc32_update,
|
|
.final = crc32_final,
|
|
.finup = crc32_finup,
|
|
.digest = crc32_digest,
|
|
.descsize = sizeof(u32),
|
|
.digestsize = CHKSUM_DIGEST_SIZE,
|
|
.base = {
|
|
.cra_name = "crc32",
|
|
.cra_driver_name = "crc32-generic",
|
|
.cra_priority = 100,
|
|
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
|
|
.cra_blocksize = CHKSUM_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(u32),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = crc32_cra_init,
|
|
}
|
|
};
|
|
|
|
static int __init crc32_mod_init(void)
|
|
{
|
|
return crypto_register_shash(&alg);
|
|
}
|
|
|
|
static void __exit crc32_mod_fini(void)
|
|
{
|
|
crypto_unregister_shash(&alg);
|
|
}
|
|
|
|
subsys_initcall(crc32_mod_init);
|
|
module_exit(crc32_mod_fini);
|
|
|
|
MODULE_AUTHOR("Alexander Boyko <alexander_boyko@xyratex.com>");
|
|
MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CRYPTO("crc32");
|
|
MODULE_ALIAS_CRYPTO("crc32-generic");
|