1 // SPDX-License-Identifier: GPL-2.0-only
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
25 #include "opcodes.h"
26
27 asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data,
28 unsigned int rounds);
29
sha224_sparc64_init(struct shash_desc * desc)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
sha256_sparc64_init(struct shash_desc * desc)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
__sha256_sparc64_update(struct sha256_state * sctx,const u8 * data,unsigned int len,unsigned int partial)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
sha256_sparc64_update(struct shash_desc * desc,const u8 * data,unsigned int len)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
sha256_sparc64_final(struct shash_desc * desc,u8 * out)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
sha224_sparc64_final(struct shash_desc * desc,u8 * hash)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);
139 memzero_explicit(D, SHA256_DIGEST_SIZE);
140
141 return 0;
142 }
143
sha256_sparc64_export(struct shash_desc * desc,void * out)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
sha256_sparc64_import(struct shash_desc * desc,const void * in)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",
172 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
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",
187 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
188 .cra_blocksize = SHA224_BLOCK_SIZE,
189 .cra_module = THIS_MODULE,
190 }
191 };
192
sparc64_has_sha256_opcode(void)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
sha256_sparc64_mod_init(void)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
sha256_sparc64_mod_fini(void)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
239 MODULE_ALIAS_CRYPTO("sha224");
240 MODULE_ALIAS_CRYPTO("sha256");
241
242 #include "crop_devid.c"
243
