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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/crc64.h>
#include <linux/module.h>
#include <crypto/internal/hash.h>
#include <linux/unaligned.h>
static int chksum_init(struct shash_desc *desc)
{
u64 *crc = shash_desc_ctx(desc);
*crc = 0;
return 0;
}
static int chksum_update(struct shash_desc *desc, const u8 *data,
unsigned int length)
{
u64 *crc = shash_desc_ctx(desc);
*crc = crc64_rocksoft_generic(*crc, data, length);
return 0;
}
static int chksum_final(struct shash_desc *desc, u8 *out)
{
u64 *crc = shash_desc_ctx(desc);
put_unaligned_le64(*crc, out);
return 0;
}
static int __chksum_finup(u64 crc, const u8 *data, unsigned int len, u8 *out)
{
crc = crc64_rocksoft_generic(crc, data, len);
put_unaligned_le64(crc, out);
return 0;
}
static int chksum_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
u64 *crc = shash_desc_ctx(desc);
return __chksum_finup(*crc, data, len, out);
}
static int chksum_digest(struct shash_desc *desc, const u8 *data,
unsigned int length, u8 *out)
{
return __chksum_finup(0, data, length, out);
}
static struct shash_alg alg = {
.digestsize = sizeof(u64),
.init = chksum_init,
.update = chksum_update,
.final = chksum_final,
.finup = chksum_finup,
.digest = chksum_digest,
.descsize = sizeof(u64),
.base = {
.cra_name = CRC64_ROCKSOFT_STRING,
.cra_driver_name = "crc64-rocksoft-generic",
.cra_priority = 200,
.cra_blocksize = 1,
.cra_module = THIS_MODULE,
}
};
static int __init crc64_rocksoft_init(void)
{
return crypto_register_shash(&alg);
}
static void __exit crc64_rocksoft_exit(void)
{
crypto_unregister_shash(&alg);
}
module_init(crc64_rocksoft_init);
module_exit(crc64_rocksoft_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Rocksoft model CRC64 calculation.");
MODULE_ALIAS_CRYPTO("crc64-rocksoft");
MODULE_ALIAS_CRYPTO("crc64-rocksoft-generic");
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