1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <crypto/internal/hash.h>
9*4882a593Smuzhiyun #include <crypto/internal/simd.h>
10*4882a593Smuzhiyun #include <crypto/sha.h>
11*4882a593Smuzhiyun #include <crypto/sha256_base.h>
12*4882a593Smuzhiyun #include <linux/cpufeature.h>
13*4882a593Smuzhiyun #include <linux/crypto.h>
14*4882a593Smuzhiyun #include <linux/module.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include <asm/hwcap.h>
17*4882a593Smuzhiyun #include <asm/simd.h>
18*4882a593Smuzhiyun #include <asm/neon.h>
19*4882a593Smuzhiyun #include <asm/unaligned.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include "sha256_glue.h"
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
24*4882a593Smuzhiyun MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
28*4882a593Smuzhiyun int blocks);
29*4882a593Smuzhiyun
sha2_ce_update(struct shash_desc * desc,const u8 * data,unsigned int len)30*4882a593Smuzhiyun static int sha2_ce_update(struct shash_desc *desc, const u8 *data,
31*4882a593Smuzhiyun unsigned int len)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun struct sha256_state *sctx = shash_desc_ctx(desc);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun if (!crypto_simd_usable() ||
36*4882a593Smuzhiyun (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
37*4882a593Smuzhiyun return crypto_sha256_arm_update(desc, data, len);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun kernel_neon_begin();
40*4882a593Smuzhiyun sha256_base_do_update(desc, data, len,
41*4882a593Smuzhiyun (sha256_block_fn *)sha2_ce_transform);
42*4882a593Smuzhiyun kernel_neon_end();
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return 0;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
sha2_ce_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)47*4882a593Smuzhiyun static int sha2_ce_finup(struct shash_desc *desc, const u8 *data,
48*4882a593Smuzhiyun unsigned int len, u8 *out)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun if (!crypto_simd_usable())
51*4882a593Smuzhiyun return crypto_sha256_arm_finup(desc, data, len, out);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun kernel_neon_begin();
54*4882a593Smuzhiyun if (len)
55*4882a593Smuzhiyun sha256_base_do_update(desc, data, len,
56*4882a593Smuzhiyun (sha256_block_fn *)sha2_ce_transform);
57*4882a593Smuzhiyun sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
58*4882a593Smuzhiyun kernel_neon_end();
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun return sha256_base_finish(desc, out);
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
sha2_ce_final(struct shash_desc * desc,u8 * out)63*4882a593Smuzhiyun static int sha2_ce_final(struct shash_desc *desc, u8 *out)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun return sha2_ce_finup(desc, NULL, 0, out);
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun static struct shash_alg algs[] = { {
69*4882a593Smuzhiyun .init = sha224_base_init,
70*4882a593Smuzhiyun .update = sha2_ce_update,
71*4882a593Smuzhiyun .final = sha2_ce_final,
72*4882a593Smuzhiyun .finup = sha2_ce_finup,
73*4882a593Smuzhiyun .descsize = sizeof(struct sha256_state),
74*4882a593Smuzhiyun .digestsize = SHA224_DIGEST_SIZE,
75*4882a593Smuzhiyun .base = {
76*4882a593Smuzhiyun .cra_name = "sha224",
77*4882a593Smuzhiyun .cra_driver_name = "sha224-ce",
78*4882a593Smuzhiyun .cra_priority = 300,
79*4882a593Smuzhiyun .cra_blocksize = SHA256_BLOCK_SIZE,
80*4882a593Smuzhiyun .cra_module = THIS_MODULE,
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun }, {
83*4882a593Smuzhiyun .init = sha256_base_init,
84*4882a593Smuzhiyun .update = sha2_ce_update,
85*4882a593Smuzhiyun .final = sha2_ce_final,
86*4882a593Smuzhiyun .finup = sha2_ce_finup,
87*4882a593Smuzhiyun .descsize = sizeof(struct sha256_state),
88*4882a593Smuzhiyun .digestsize = SHA256_DIGEST_SIZE,
89*4882a593Smuzhiyun .base = {
90*4882a593Smuzhiyun .cra_name = "sha256",
91*4882a593Smuzhiyun .cra_driver_name = "sha256-ce",
92*4882a593Smuzhiyun .cra_priority = 300,
93*4882a593Smuzhiyun .cra_blocksize = SHA256_BLOCK_SIZE,
94*4882a593Smuzhiyun .cra_module = THIS_MODULE,
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun } };
97*4882a593Smuzhiyun
sha2_ce_mod_init(void)98*4882a593Smuzhiyun static int __init sha2_ce_mod_init(void)
99*4882a593Smuzhiyun {
100*4882a593Smuzhiyun return crypto_register_shashes(algs, ARRAY_SIZE(algs));
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
sha2_ce_mod_fini(void)103*4882a593Smuzhiyun static void __exit sha2_ce_mod_fini(void)
104*4882a593Smuzhiyun {
105*4882a593Smuzhiyun crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
106*4882a593Smuzhiyun }
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun module_cpu_feature_match(SHA2, sha2_ce_mod_init);
109*4882a593Smuzhiyun module_exit(sha2_ce_mod_fini);
110