2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
4 * Copyright (C) 2014 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.
12 #include <asm/unaligned.h>
13 #include <crypto/internal/hash.h>
14 #include <crypto/sha.h>
15 #include <crypto/sha256_base.h>
16 #include <linux/cpufeature.h>
17 #include <linux/crypto.h>
18 #include <linux/module.h>
20 #define ASM_EXPORT(sym, val) \
21 asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val));
23 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25 MODULE_LICENSE("GPL v2");
27 struct sha256_ce_state {
28 struct sha256_state sst;
32 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
35 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
38 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
41 kernel_neon_begin_partial(28);
42 sha256_base_do_update(desc, data, len,
43 (sha256_block_fn *)sha2_ce_transform);
49 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
50 unsigned int len, u8 *out)
52 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
53 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
55 ASM_EXPORT(sha256_ce_offsetof_count,
56 offsetof(struct sha256_ce_state, sst.count));
57 ASM_EXPORT(sha256_ce_offsetof_finalize,
58 offsetof(struct sha256_ce_state, finalize));
61 * Allow the asm code to perform the finalization if there is no
62 * partial data and the input is a round multiple of the block size.
64 sctx->finalize = finalize;
66 kernel_neon_begin_partial(28);
67 sha256_base_do_update(desc, data, len,
68 (sha256_block_fn *)sha2_ce_transform);
70 sha256_base_do_finalize(desc,
71 (sha256_block_fn *)sha2_ce_transform);
73 return sha256_base_finish(desc, out);
76 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
78 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
81 kernel_neon_begin_partial(28);
82 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
84 return sha256_base_finish(desc, out);
87 static struct shash_alg algs[] = { {
88 .init = sha224_base_init,
89 .update = sha256_ce_update,
90 .final = sha256_ce_final,
91 .finup = sha256_ce_finup,
92 .descsize = sizeof(struct sha256_ce_state),
93 .digestsize = SHA224_DIGEST_SIZE,
96 .cra_driver_name = "sha224-ce",
98 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
99 .cra_blocksize = SHA256_BLOCK_SIZE,
100 .cra_module = THIS_MODULE,
103 .init = sha256_base_init,
104 .update = sha256_ce_update,
105 .final = sha256_ce_final,
106 .finup = sha256_ce_finup,
107 .descsize = sizeof(struct sha256_ce_state),
108 .digestsize = SHA256_DIGEST_SIZE,
110 .cra_name = "sha256",
111 .cra_driver_name = "sha256-ce",
113 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
114 .cra_blocksize = SHA256_BLOCK_SIZE,
115 .cra_module = THIS_MODULE,
119 static int __init sha2_ce_mod_init(void)
121 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
124 static void __exit sha2_ce_mod_fini(void)
126 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
129 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
130 module_exit(sha2_ce_mod_fini);