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/sha2.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 extern const u32 sha256_ce_offsetof_count;
31 extern const u32 sha256_ce_offsetof_finalize;
33 asmlinkage int __sha256_ce_transform(struct sha256_ce_state *sst, u8 const *src,
36 static void sha256_ce_transform(struct sha256_state *sst, u8 const *src,
43 rem = __sha256_ce_transform(container_of(sst,
44 struct sha256_ce_state,
47 src += (blocks - rem) * SHA256_BLOCK_SIZE;
52 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
54 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
57 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
59 static void sha256_arm64_transform(struct sha256_state *sst, u8 const *src,
62 sha256_block_data_order(sst->state, src, blocks);
65 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
68 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
70 if (!crypto_simd_usable())
71 return sha256_base_do_update(desc, data, len,
72 sha256_arm64_transform);
75 sha256_base_do_update(desc, data, len, sha256_ce_transform);
80 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
81 unsigned int len, u8 *out)
83 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
84 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
86 if (!crypto_simd_usable()) {
88 sha256_base_do_update(desc, data, len,
89 sha256_arm64_transform);
90 sha256_base_do_finalize(desc, sha256_arm64_transform);
91 return sha256_base_finish(desc, out);
95 * Allow the asm code to perform the finalization if there is no
96 * partial data and the input is a round multiple of the block size.
98 sctx->finalize = finalize;
100 sha256_base_do_update(desc, data, len, sha256_ce_transform);
102 sha256_base_do_finalize(desc, sha256_ce_transform);
103 return sha256_base_finish(desc, out);
106 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
108 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
110 if (!crypto_simd_usable()) {
111 sha256_base_do_finalize(desc, sha256_arm64_transform);
112 return sha256_base_finish(desc, out);
116 sha256_base_do_finalize(desc, sha256_ce_transform);
117 return sha256_base_finish(desc, out);
120 static int sha256_ce_digest(struct shash_desc *desc, const u8 *data,
121 unsigned int len, u8 *out)
123 sha256_base_init(desc);
124 return sha256_ce_finup(desc, data, len, out);
127 static int sha256_ce_export(struct shash_desc *desc, void *out)
129 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
131 memcpy(out, &sctx->sst, sizeof(struct sha256_state));
135 static int sha256_ce_import(struct shash_desc *desc, const void *in)
137 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
139 memcpy(&sctx->sst, in, sizeof(struct sha256_state));
144 static struct shash_alg algs[] = { {
145 .init = sha224_base_init,
146 .update = sha256_ce_update,
147 .final = sha256_ce_final,
148 .finup = sha256_ce_finup,
149 .export = sha256_ce_export,
150 .import = sha256_ce_import,
151 .descsize = sizeof(struct sha256_ce_state),
152 .statesize = sizeof(struct sha256_state),
153 .digestsize = SHA224_DIGEST_SIZE,
155 .cra_name = "sha224",
156 .cra_driver_name = "sha224-ce",
158 .cra_blocksize = SHA256_BLOCK_SIZE,
159 .cra_module = THIS_MODULE,
162 .init = sha256_base_init,
163 .update = sha256_ce_update,
164 .final = sha256_ce_final,
165 .finup = sha256_ce_finup,
166 .digest = sha256_ce_digest,
167 .export = sha256_ce_export,
168 .import = sha256_ce_import,
169 .descsize = sizeof(struct sha256_ce_state),
170 .statesize = sizeof(struct sha256_state),
171 .digestsize = SHA256_DIGEST_SIZE,
173 .cra_name = "sha256",
174 .cra_driver_name = "sha256-ce",
176 .cra_blocksize = SHA256_BLOCK_SIZE,
177 .cra_module = THIS_MODULE,
181 static int __init sha2_ce_mod_init(void)
183 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
186 static void __exit sha2_ce_mod_fini(void)
188 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
191 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
192 module_exit(sha2_ce_mod_fini);