cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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crc64_rocksoft_generic.c (1904B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2
      3#include <linux/crc64.h>
      4#include <linux/module.h>
      5#include <crypto/internal/hash.h>
      6#include <asm/unaligned.h>
      7
      8static int chksum_init(struct shash_desc *desc)
      9{
     10	u64 *crc = shash_desc_ctx(desc);
     11
     12	*crc = 0;
     13
     14	return 0;
     15}
     16
     17static int chksum_update(struct shash_desc *desc, const u8 *data,
     18			 unsigned int length)
     19{
     20	u64 *crc = shash_desc_ctx(desc);
     21
     22	*crc = crc64_rocksoft_generic(*crc, data, length);
     23
     24	return 0;
     25}
     26
     27static int chksum_final(struct shash_desc *desc, u8 *out)
     28{
     29	u64 *crc = shash_desc_ctx(desc);
     30
     31	put_unaligned_le64(*crc, out);
     32	return 0;
     33}
     34
     35static int __chksum_finup(u64 crc, const u8 *data, unsigned int len, u8 *out)
     36{
     37	crc = crc64_rocksoft_generic(crc, data, len);
     38	put_unaligned_le64(crc, out);
     39	return 0;
     40}
     41
     42static int chksum_finup(struct shash_desc *desc, const u8 *data,
     43			unsigned int len, u8 *out)
     44{
     45	u64 *crc = shash_desc_ctx(desc);
     46
     47	return __chksum_finup(*crc, data, len, out);
     48}
     49
     50static int chksum_digest(struct shash_desc *desc, const u8 *data,
     51			 unsigned int length, u8 *out)
     52{
     53	return __chksum_finup(0, data, length, out);
     54}
     55
     56static struct shash_alg alg = {
     57	.digestsize	= 	sizeof(u64),
     58	.init		=	chksum_init,
     59	.update		=	chksum_update,
     60	.final		=	chksum_final,
     61	.finup		=	chksum_finup,
     62	.digest		=	chksum_digest,
     63	.descsize	=	sizeof(u64),
     64	.base		=	{
     65		.cra_name		=	CRC64_ROCKSOFT_STRING,
     66		.cra_driver_name	=	"crc64-rocksoft-generic",
     67		.cra_priority		=	200,
     68		.cra_blocksize		=	1,
     69		.cra_module		=	THIS_MODULE,
     70	}
     71};
     72
     73static int __init crc64_rocksoft_init(void)
     74{
     75	return crypto_register_shash(&alg);
     76}
     77
     78static void __exit crc64_rocksoft_exit(void)
     79{
     80	crypto_unregister_shash(&alg);
     81}
     82
     83module_init(crc64_rocksoft_init);
     84module_exit(crc64_rocksoft_exit);
     85
     86MODULE_LICENSE("GPL");
     87MODULE_DESCRIPTION("Rocksoft model CRC64 calculation.");
     88MODULE_ALIAS_CRYPTO("crc64-rocksoft");
     89MODULE_ALIAS_CRYPTO("crc64-rocksoft-generic");