2 * Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions instructions
4 * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/crc-t10dif.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/string.h>
17 #include <crypto/internal/hash.h>
18 #include <crypto/internal/simd.h>
23 #define CRC_T10DIF_PMULL_CHUNK_SIZE 16U
25 asmlinkage u16 crc_t10dif_pmull(u16 init_crc, const u8 *buf, size_t len);
27 static int crct10dif_init(struct shash_desc *desc)
29 u16 *crc = shash_desc_ctx(desc);
35 static int crct10dif_update(struct shash_desc *desc, const u8 *data,
38 u16 *crc = shash_desc_ctx(desc);
40 if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) {
42 *crc = crc_t10dif_pmull(*crc, data, length);
45 *crc = crc_t10dif_generic(*crc, data, length);
51 static int crct10dif_final(struct shash_desc *desc, u8 *out)
53 u16 *crc = shash_desc_ctx(desc);
59 static struct shash_alg crc_t10dif_alg = {
60 .digestsize = CRC_T10DIF_DIGEST_SIZE,
61 .init = crct10dif_init,
62 .update = crct10dif_update,
63 .final = crct10dif_final,
64 .descsize = CRC_T10DIF_DIGEST_SIZE,
66 .base.cra_name = "crct10dif",
67 .base.cra_driver_name = "crct10dif-arm-ce",
68 .base.cra_priority = 200,
69 .base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE,
70 .base.cra_module = THIS_MODULE,
73 static int __init crc_t10dif_mod_init(void)
75 if (!(elf_hwcap2 & HWCAP2_PMULL))
78 return crypto_register_shash(&crc_t10dif_alg);
81 static void __exit crc_t10dif_mod_exit(void)
83 crypto_unregister_shash(&crc_t10dif_alg);
86 module_init(crc_t10dif_mod_init);
87 module_exit(crc_t10dif_mod_exit);
89 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
90 MODULE_LICENSE("GPL v2");
91 MODULE_ALIAS_CRYPTO("crct10dif");