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 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
21 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
22 MODULE_LICENSE("GPL v2");
24 struct sha256_ce_state {
25 struct sha256_state sst;
29 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
32 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
34 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
37 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
40 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
43 kernel_neon_begin_partial(28);
44 sha256_base_do_update(desc, data, len,
45 (sha256_block_fn *)sha2_ce_transform);
51 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
52 unsigned int len, u8 *out)
54 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
55 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
58 * Allow the asm code to perform the finalization if there is no
59 * partial data and the input is a round multiple of the block size.
61 sctx->finalize = finalize;
63 kernel_neon_begin_partial(28);
64 sha256_base_do_update(desc, data, len,
65 (sha256_block_fn *)sha2_ce_transform);
67 sha256_base_do_finalize(desc,
68 (sha256_block_fn *)sha2_ce_transform);
70 return sha256_base_finish(desc, out);
73 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
75 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
78 kernel_neon_begin_partial(28);
79 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
81 return sha256_base_finish(desc, out);
84 static struct shash_alg algs[] = { {
85 .init = sha224_base_init,
86 .update = sha256_ce_update,
87 .final = sha256_ce_final,
88 .finup = sha256_ce_finup,
89 .descsize = sizeof(struct sha256_ce_state),
90 .digestsize = SHA224_DIGEST_SIZE,
93 .cra_driver_name = "sha224-ce",
95 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
96 .cra_blocksize = SHA256_BLOCK_SIZE,
97 .cra_module = THIS_MODULE,
100 .init = sha256_base_init,
101 .update = sha256_ce_update,
102 .final = sha256_ce_final,
103 .finup = sha256_ce_finup,
104 .descsize = sizeof(struct sha256_ce_state),
105 .digestsize = SHA256_DIGEST_SIZE,
107 .cra_name = "sha256",
108 .cra_driver_name = "sha256-ce",
110 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
111 .cra_blocksize = SHA256_BLOCK_SIZE,
112 .cra_module = THIS_MODULE,
116 static int __init sha2_ce_mod_init(void)
118 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
121 static void __exit sha2_ce_mod_fini(void)
123 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
126 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
127 module_exit(sha2_ce_mod_fini);