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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
86c93b24 DM |
2 | /* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes. |
3 | * | |
4 | * This is based largely upon crypto/sha256_generic.c | |
5 | * | |
6 | * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> | |
7 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
8 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
9 | * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
13 | ||
14 | #include <crypto/internal/hash.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/cryptohash.h> | |
19 | #include <linux/types.h> | |
20 | #include <crypto/sha.h> | |
21 | ||
22 | #include <asm/pstate.h> | |
23 | #include <asm/elf.h> | |
24 | ||
10803624 DM |
25 | #include "opcodes.h" |
26 | ||
86c93b24 DM |
27 | asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data, |
28 | unsigned int rounds); | |
29 | ||
30 | static int sha224_sparc64_init(struct shash_desc *desc) | |
31 | { | |
32 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
33 | sctx->state[0] = SHA224_H0; | |
34 | sctx->state[1] = SHA224_H1; | |
35 | sctx->state[2] = SHA224_H2; | |
36 | sctx->state[3] = SHA224_H3; | |
37 | sctx->state[4] = SHA224_H4; | |
38 | sctx->state[5] = SHA224_H5; | |
39 | sctx->state[6] = SHA224_H6; | |
40 | sctx->state[7] = SHA224_H7; | |
41 | sctx->count = 0; | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
46 | static int sha256_sparc64_init(struct shash_desc *desc) | |
47 | { | |
48 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
49 | sctx->state[0] = SHA256_H0; | |
50 | sctx->state[1] = SHA256_H1; | |
51 | sctx->state[2] = SHA256_H2; | |
52 | sctx->state[3] = SHA256_H3; | |
53 | sctx->state[4] = SHA256_H4; | |
54 | sctx->state[5] = SHA256_H5; | |
55 | sctx->state[6] = SHA256_H6; | |
56 | sctx->state[7] = SHA256_H7; | |
57 | sctx->count = 0; | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data, | |
63 | unsigned int len, unsigned int partial) | |
64 | { | |
65 | unsigned int done = 0; | |
66 | ||
67 | sctx->count += len; | |
68 | if (partial) { | |
69 | done = SHA256_BLOCK_SIZE - partial; | |
70 | memcpy(sctx->buf + partial, data, done); | |
71 | sha256_sparc64_transform(sctx->state, sctx->buf, 1); | |
72 | } | |
73 | if (len - done >= SHA256_BLOCK_SIZE) { | |
74 | const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE; | |
75 | ||
76 | sha256_sparc64_transform(sctx->state, data + done, rounds); | |
77 | done += rounds * SHA256_BLOCK_SIZE; | |
78 | } | |
79 | ||
80 | memcpy(sctx->buf, data + done, len - done); | |
81 | } | |
82 | ||
83 | static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data, | |
84 | unsigned int len) | |
85 | { | |
86 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
87 | unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; | |
88 | ||
89 | /* Handle the fast case right here */ | |
90 | if (partial + len < SHA256_BLOCK_SIZE) { | |
91 | sctx->count += len; | |
92 | memcpy(sctx->buf + partial, data, len); | |
93 | } else | |
94 | __sha256_sparc64_update(sctx, data, len, partial); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int sha256_sparc64_final(struct shash_desc *desc, u8 *out) | |
100 | { | |
101 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
102 | unsigned int i, index, padlen; | |
103 | __be32 *dst = (__be32 *)out; | |
104 | __be64 bits; | |
105 | static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, }; | |
106 | ||
107 | bits = cpu_to_be64(sctx->count << 3); | |
108 | ||
109 | /* Pad out to 56 mod 64 and append length */ | |
110 | index = sctx->count % SHA256_BLOCK_SIZE; | |
111 | padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index); | |
112 | ||
113 | /* We need to fill a whole block for __sha256_sparc64_update() */ | |
114 | if (padlen <= 56) { | |
115 | sctx->count += padlen; | |
116 | memcpy(sctx->buf + index, padding, padlen); | |
117 | } else { | |
118 | __sha256_sparc64_update(sctx, padding, padlen, index); | |
119 | } | |
120 | __sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56); | |
121 | ||
122 | /* Store state in digest */ | |
123 | for (i = 0; i < 8; i++) | |
124 | dst[i] = cpu_to_be32(sctx->state[i]); | |
125 | ||
126 | /* Wipe context */ | |
127 | memset(sctx, 0, sizeof(*sctx)); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash) | |
133 | { | |
134 | u8 D[SHA256_DIGEST_SIZE]; | |
135 | ||
136 | sha256_sparc64_final(desc, D); | |
137 | ||
138 | memcpy(hash, D, SHA224_DIGEST_SIZE); | |
8202cd72 | 139 | memzero_explicit(D, SHA256_DIGEST_SIZE); |
86c93b24 DM |
140 | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int sha256_sparc64_export(struct shash_desc *desc, void *out) | |
145 | { | |
146 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
147 | ||
148 | memcpy(out, sctx, sizeof(*sctx)); | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int sha256_sparc64_import(struct shash_desc *desc, const void *in) | |
153 | { | |
154 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
155 | ||
156 | memcpy(sctx, in, sizeof(*sctx)); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | static struct shash_alg sha256 = { | |
161 | .digestsize = SHA256_DIGEST_SIZE, | |
162 | .init = sha256_sparc64_init, | |
163 | .update = sha256_sparc64_update, | |
164 | .final = sha256_sparc64_final, | |
165 | .export = sha256_sparc64_export, | |
166 | .import = sha256_sparc64_import, | |
167 | .descsize = sizeof(struct sha256_state), | |
168 | .statesize = sizeof(struct sha256_state), | |
169 | .base = { | |
170 | .cra_name = "sha256", | |
171 | .cra_driver_name= "sha256-sparc64", | |
10803624 | 172 | .cra_priority = SPARC_CR_OPCODE_PRIORITY, |
86c93b24 DM |
173 | .cra_blocksize = SHA256_BLOCK_SIZE, |
174 | .cra_module = THIS_MODULE, | |
175 | } | |
176 | }; | |
177 | ||
178 | static struct shash_alg sha224 = { | |
179 | .digestsize = SHA224_DIGEST_SIZE, | |
180 | .init = sha224_sparc64_init, | |
181 | .update = sha256_sparc64_update, | |
182 | .final = sha224_sparc64_final, | |
183 | .descsize = sizeof(struct sha256_state), | |
184 | .base = { | |
185 | .cra_name = "sha224", | |
186 | .cra_driver_name= "sha224-sparc64", | |
10803624 | 187 | .cra_priority = SPARC_CR_OPCODE_PRIORITY, |
86c93b24 DM |
188 | .cra_blocksize = SHA224_BLOCK_SIZE, |
189 | .cra_module = THIS_MODULE, | |
190 | } | |
191 | }; | |
192 | ||
193 | static bool __init sparc64_has_sha256_opcode(void) | |
194 | { | |
195 | unsigned long cfr; | |
196 | ||
197 | if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) | |
198 | return false; | |
199 | ||
200 | __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); | |
201 | if (!(cfr & CFR_SHA256)) | |
202 | return false; | |
203 | ||
204 | return true; | |
205 | } | |
206 | ||
207 | static int __init sha256_sparc64_mod_init(void) | |
208 | { | |
209 | if (sparc64_has_sha256_opcode()) { | |
210 | int ret = crypto_register_shash(&sha224); | |
211 | if (ret < 0) | |
212 | return ret; | |
213 | ||
214 | ret = crypto_register_shash(&sha256); | |
215 | if (ret < 0) { | |
216 | crypto_unregister_shash(&sha224); | |
217 | return ret; | |
218 | } | |
219 | ||
220 | pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n"); | |
221 | return 0; | |
222 | } | |
223 | pr_info("sparc64 sha256 opcode not available.\n"); | |
224 | return -ENODEV; | |
225 | } | |
226 | ||
227 | static void __exit sha256_sparc64_mod_fini(void) | |
228 | { | |
229 | crypto_unregister_shash(&sha224); | |
230 | crypto_unregister_shash(&sha256); | |
231 | } | |
232 | ||
233 | module_init(sha256_sparc64_mod_init); | |
234 | module_exit(sha256_sparc64_mod_fini); | |
235 | ||
236 | MODULE_LICENSE("GPL"); | |
237 | MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated"); | |
238 | ||
5d26a105 KC |
239 | MODULE_ALIAS_CRYPTO("sha224"); |
240 | MODULE_ALIAS_CRYPTO("sha256"); | |
226f7cea DM |
241 | |
242 | #include "crop_devid.c" |