1 // SPDX-License-Identifier: GPL-2.0-only
3 * sha1-ce-glue.c - SHA-1 secure hash 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/sha1_base.h>
15 #include <linux/cpufeature.h>
16 #include <linux/crypto.h>
17 #include <linux/module.h>
19 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21 MODULE_LICENSE("GPL v2");
22 MODULE_ALIAS_CRYPTO("sha1");
24 struct sha1_ce_state {
25 struct sha1_state sst;
29 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
32 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
33 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
35 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
38 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
40 if (!crypto_simd_usable())
41 return crypto_sha1_update(desc, data, len);
45 sha1_base_do_update(desc, data, len,
46 (sha1_block_fn *)sha1_ce_transform);
52 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
53 unsigned int len, u8 *out)
55 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
56 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
58 if (!crypto_simd_usable())
59 return crypto_sha1_finup(desc, data, len, out);
62 * Allow the asm code to perform the finalization if there is no
63 * partial data and the input is a round multiple of the block size.
65 sctx->finalize = finalize;
68 sha1_base_do_update(desc, data, len,
69 (sha1_block_fn *)sha1_ce_transform);
71 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
73 return sha1_base_finish(desc, out);
76 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
78 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
80 if (!crypto_simd_usable())
81 return crypto_sha1_finup(desc, NULL, 0, out);
85 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
87 return sha1_base_finish(desc, out);
90 static struct shash_alg alg = {
91 .init = sha1_base_init,
92 .update = sha1_ce_update,
93 .final = sha1_ce_final,
94 .finup = sha1_ce_finup,
95 .descsize = sizeof(struct sha1_ce_state),
96 .digestsize = SHA1_DIGEST_SIZE,
99 .cra_driver_name = "sha1-ce",
101 .cra_blocksize = SHA1_BLOCK_SIZE,
102 .cra_module = THIS_MODULE,
106 static int __init sha1_ce_mod_init(void)
108 return crypto_register_shash(&alg);
111 static void __exit sha1_ce_mod_fini(void)
113 crypto_unregister_shash(&alg);
116 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
117 module_exit(sha1_ce_mod_fini);