2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
4 * Copyright (C) 2014 - 2017 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.
13 #include <asm/unaligned.h>
14 #include <crypto/internal/hash.h>
15 #include <crypto/internal/simd.h>
16 #include <crypto/sha.h>
17 #include <crypto/sha256_base.h>
18 #include <linux/cpufeature.h>
19 #include <linux/crypto.h>
20 #include <linux/module.h>
22 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
24 MODULE_LICENSE("GPL v2");
26 struct sha256_ce_state {
27 struct sha256_state sst;
31 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
34 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
36 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
39 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
41 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
44 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
46 if (!crypto_simd_usable())
47 return sha256_base_do_update(desc, data, len,
48 (sha256_block_fn *)sha256_block_data_order);
52 sha256_base_do_update(desc, data, len,
53 (sha256_block_fn *)sha2_ce_transform);
59 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
60 unsigned int len, u8 *out)
62 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
63 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
65 if (!crypto_simd_usable()) {
67 sha256_base_do_update(desc, data, len,
68 (sha256_block_fn *)sha256_block_data_order);
69 sha256_base_do_finalize(desc,
70 (sha256_block_fn *)sha256_block_data_order);
71 return sha256_base_finish(desc, out);
75 * Allow the asm code to perform the finalization if there is no
76 * partial data and the input is a round multiple of the block size.
78 sctx->finalize = finalize;
81 sha256_base_do_update(desc, data, len,
82 (sha256_block_fn *)sha2_ce_transform);
84 sha256_base_do_finalize(desc,
85 (sha256_block_fn *)sha2_ce_transform);
87 return sha256_base_finish(desc, out);
90 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
92 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
94 if (!crypto_simd_usable()) {
95 sha256_base_do_finalize(desc,
96 (sha256_block_fn *)sha256_block_data_order);
97 return sha256_base_finish(desc, out);
102 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
104 return sha256_base_finish(desc, out);
107 static struct shash_alg algs[] = { {
108 .init = sha224_base_init,
109 .update = sha256_ce_update,
110 .final = sha256_ce_final,
111 .finup = sha256_ce_finup,
112 .descsize = sizeof(struct sha256_ce_state),
113 .digestsize = SHA224_DIGEST_SIZE,
115 .cra_name = "sha224",
116 .cra_driver_name = "sha224-ce",
118 .cra_blocksize = SHA256_BLOCK_SIZE,
119 .cra_module = THIS_MODULE,
122 .init = sha256_base_init,
123 .update = sha256_ce_update,
124 .final = sha256_ce_final,
125 .finup = sha256_ce_finup,
126 .descsize = sizeof(struct sha256_ce_state),
127 .digestsize = SHA256_DIGEST_SIZE,
129 .cra_name = "sha256",
130 .cra_driver_name = "sha256-ce",
132 .cra_blocksize = SHA256_BLOCK_SIZE,
133 .cra_module = THIS_MODULE,
137 static int __init sha2_ce_mod_init(void)
139 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
142 static void __exit sha2_ce_mod_fini(void)
144 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
147 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
148 module_exit(sha2_ce_mod_fini);