1 // SPDX-License-Identifier: GPL-2.0-only
3 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
5 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
10 #include <asm/unaligned.h>
11 #include <crypto/internal/hash.h>
12 #include <crypto/internal/simd.h>
13 #include <crypto/sha.h>
14 #include <crypto/sha256_base.h>
15 #include <linux/cpufeature.h>
16 #include <linux/crypto.h>
17 #include <linux/module.h>
19 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21 MODULE_LICENSE("GPL v2");
22 MODULE_ALIAS_CRYPTO("sha224");
23 MODULE_ALIAS_CRYPTO("sha256");
25 struct sha256_ce_state {
26 struct sha256_state sst;
30 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
33 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
35 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
38 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
40 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
43 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
45 if (!crypto_simd_usable())
46 return sha256_base_do_update(desc, data, len,
47 (sha256_block_fn *)sha256_block_data_order);
51 sha256_base_do_update(desc, data, len,
52 (sha256_block_fn *)sha2_ce_transform);
58 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
59 unsigned int len, u8 *out)
61 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
62 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
64 if (!crypto_simd_usable()) {
66 sha256_base_do_update(desc, data, len,
67 (sha256_block_fn *)sha256_block_data_order);
68 sha256_base_do_finalize(desc,
69 (sha256_block_fn *)sha256_block_data_order);
70 return sha256_base_finish(desc, out);
74 * Allow the asm code to perform the finalization if there is no
75 * partial data and the input is a round multiple of the block size.
77 sctx->finalize = finalize;
80 sha256_base_do_update(desc, data, len,
81 (sha256_block_fn *)sha2_ce_transform);
83 sha256_base_do_finalize(desc,
84 (sha256_block_fn *)sha2_ce_transform);
86 return sha256_base_finish(desc, out);
89 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
91 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
93 if (!crypto_simd_usable()) {
94 sha256_base_do_finalize(desc,
95 (sha256_block_fn *)sha256_block_data_order);
96 return sha256_base_finish(desc, out);
101 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
103 return sha256_base_finish(desc, out);
106 static struct shash_alg algs[] = { {
107 .init = sha224_base_init,
108 .update = sha256_ce_update,
109 .final = sha256_ce_final,
110 .finup = sha256_ce_finup,
111 .descsize = sizeof(struct sha256_ce_state),
112 .digestsize = SHA224_DIGEST_SIZE,
114 .cra_name = "sha224",
115 .cra_driver_name = "sha224-ce",
117 .cra_blocksize = SHA256_BLOCK_SIZE,
118 .cra_module = THIS_MODULE,
121 .init = sha256_base_init,
122 .update = sha256_ce_update,
123 .final = sha256_ce_final,
124 .finup = sha256_ce_finup,
125 .descsize = sizeof(struct sha256_ce_state),
126 .digestsize = SHA256_DIGEST_SIZE,
128 .cra_name = "sha256",
129 .cra_driver_name = "sha256-ce",
131 .cra_blocksize = SHA256_BLOCK_SIZE,
132 .cra_module = THIS_MODULE,
136 static int __init sha2_ce_mod_init(void)
138 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
141 static void __exit sha2_ce_mod_fini(void)
143 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
146 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
147 module_exit(sha2_ce_mod_fini);