projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| f3813f4b KB |
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 | ||
| 8 | static 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 | ||
| 17 | static 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 | ||
| 27 | static 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 | ||
| 35 | static 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 | ||
| 42 | static 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 | ||
| 50 | static 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 | ||
| 56 | static 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 | ||
| 73 | static int __init crc64_rocksoft_init(void) | |
| 74 | { | |
| 75 | return crypto_register_shash(&alg); | |
| 76 | } | |
| 77 | ||
| 78 | static void __exit crc64_rocksoft_exit(void) | |
| 79 | { | |
| 80 | crypto_unregister_shash(&alg); | |
| 81 | } | |
| 82 | ||
| 83 | module_init(crc64_rocksoft_init); | |
| 84 | module_exit(crc64_rocksoft_exit); | |
| 85 | ||
| 86 | MODULE_LICENSE("GPL"); | |
| 87 | MODULE_DESCRIPTION("Rocksoft model CRC64 calculation."); | |
| 88 | MODULE_ALIAS_CRYPTO("crc64-rocksoft"); | |
| 89 | MODULE_ALIAS_CRYPTO("crc64-rocksoft-generic"); |