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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/types.h>
19#include <crypto/sha2.h>
20
21#include <asm/pstate.h>
22#include <asm/elf.h>
23
24#include "opcodes.h"
25
26asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data,
27 unsigned int rounds);
28
29static int sha224_sparc64_init(struct shash_desc *desc)
30{
31 struct sha256_state *sctx = shash_desc_ctx(desc);
32 sctx->state[0] = SHA224_H0;
33 sctx->state[1] = SHA224_H1;
34 sctx->state[2] = SHA224_H2;
35 sctx->state[3] = SHA224_H3;
36 sctx->state[4] = SHA224_H4;
37 sctx->state[5] = SHA224_H5;
38 sctx->state[6] = SHA224_H6;
39 sctx->state[7] = SHA224_H7;
40 sctx->count = 0;
41
42 return 0;
43}
44
45static int sha256_sparc64_init(struct shash_desc *desc)
46{
47 struct sha256_state *sctx = shash_desc_ctx(desc);
48 sctx->state[0] = SHA256_H0;
49 sctx->state[1] = SHA256_H1;
50 sctx->state[2] = SHA256_H2;
51 sctx->state[3] = SHA256_H3;
52 sctx->state[4] = SHA256_H4;
53 sctx->state[5] = SHA256_H5;
54 sctx->state[6] = SHA256_H6;
55 sctx->state[7] = SHA256_H7;
56 sctx->count = 0;
57
58 return 0;
59}
60
61static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data,
62 unsigned int len, unsigned int partial)
63{
64 unsigned int done = 0;
65
66 sctx->count += len;
67 if (partial) {
68 done = SHA256_BLOCK_SIZE - partial;
69 memcpy(sctx->buf + partial, data, done);
70 sha256_sparc64_transform(sctx->state, sctx->buf, 1);
71 }
72 if (len - done >= SHA256_BLOCK_SIZE) {
73 const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
74
75 sha256_sparc64_transform(sctx->state, data + done, rounds);
76 done += rounds * SHA256_BLOCK_SIZE;
77 }
78
79 memcpy(sctx->buf, data + done, len - done);
80}
81
82static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data,
83 unsigned int len)
84{
85 struct sha256_state *sctx = shash_desc_ctx(desc);
86 unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
87
88
89 if (partial + len < SHA256_BLOCK_SIZE) {
90 sctx->count += len;
91 memcpy(sctx->buf + partial, data, len);
92 } else
93 __sha256_sparc64_update(sctx, data, len, partial);
94
95 return 0;
96}
97
98static int sha256_sparc64_final(struct shash_desc *desc, u8 *out)
99{
100 struct sha256_state *sctx = shash_desc_ctx(desc);
101 unsigned int i, index, padlen;
102 __be32 *dst = (__be32 *)out;
103 __be64 bits;
104 static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
105
106 bits = cpu_to_be64(sctx->count << 3);
107
108
109 index = sctx->count % SHA256_BLOCK_SIZE;
110 padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index);
111
112
113 if (padlen <= 56) {
114 sctx->count += padlen;
115 memcpy(sctx->buf + index, padding, padlen);
116 } else {
117 __sha256_sparc64_update(sctx, padding, padlen, index);
118 }
119 __sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
120
121
122 for (i = 0; i < 8; i++)
123 dst[i] = cpu_to_be32(sctx->state[i]);
124
125
126 memset(sctx, 0, sizeof(*sctx));
127
128 return 0;
129}
130
131static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash)
132{
133 u8 D[SHA256_DIGEST_SIZE];
134
135 sha256_sparc64_final(desc, D);
136
137 memcpy(hash, D, SHA224_DIGEST_SIZE);
138 memzero_explicit(D, SHA256_DIGEST_SIZE);
139
140 return 0;
141}
142
143static int sha256_sparc64_export(struct shash_desc *desc, void *out)
144{
145 struct sha256_state *sctx = shash_desc_ctx(desc);
146
147 memcpy(out, sctx, sizeof(*sctx));
148 return 0;
149}
150
151static int sha256_sparc64_import(struct shash_desc *desc, const void *in)
152{
153 struct sha256_state *sctx = shash_desc_ctx(desc);
154
155 memcpy(sctx, in, sizeof(*sctx));
156 return 0;
157}
158
159static struct shash_alg sha256_alg = {
160 .digestsize = SHA256_DIGEST_SIZE,
161 .init = sha256_sparc64_init,
162 .update = sha256_sparc64_update,
163 .final = sha256_sparc64_final,
164 .export = sha256_sparc64_export,
165 .import = sha256_sparc64_import,
166 .descsize = sizeof(struct sha256_state),
167 .statesize = sizeof(struct sha256_state),
168 .base = {
169 .cra_name = "sha256",
170 .cra_driver_name= "sha256-sparc64",
171 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
172 .cra_blocksize = SHA256_BLOCK_SIZE,
173 .cra_module = THIS_MODULE,
174 }
175};
176
177static struct shash_alg sha224_alg = {
178 .digestsize = SHA224_DIGEST_SIZE,
179 .init = sha224_sparc64_init,
180 .update = sha256_sparc64_update,
181 .final = sha224_sparc64_final,
182 .descsize = sizeof(struct sha256_state),
183 .base = {
184 .cra_name = "sha224",
185 .cra_driver_name= "sha224-sparc64",
186 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
187 .cra_blocksize = SHA224_BLOCK_SIZE,
188 .cra_module = THIS_MODULE,
189 }
190};
191
192static bool __init sparc64_has_sha256_opcode(void)
193{
194 unsigned long cfr;
195
196 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
197 return false;
198
199 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
200 if (!(cfr & CFR_SHA256))
201 return false;
202
203 return true;
204}
205
206static int __init sha256_sparc64_mod_init(void)
207{
208 if (sparc64_has_sha256_opcode()) {
209 int ret = crypto_register_shash(&sha224_alg);
210 if (ret < 0)
211 return ret;
212
213 ret = crypto_register_shash(&sha256_alg);
214 if (ret < 0) {
215 crypto_unregister_shash(&sha224_alg);
216 return ret;
217 }
218
219 pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
220 return 0;
221 }
222 pr_info("sparc64 sha256 opcode not available.\n");
223 return -ENODEV;
224}
225
226static void __exit sha256_sparc64_mod_fini(void)
227{
228 crypto_unregister_shash(&sha224_alg);
229 crypto_unregister_shash(&sha256_alg);
230}
231
232module_init(sha256_sparc64_mod_init);
233module_exit(sha256_sparc64_mod_fini);
234
235MODULE_LICENSE("GPL");
236MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated");
237
238MODULE_ALIAS_CRYPTO("sha224");
239MODULE_ALIAS_CRYPTO("sha256");
240
241#include "crop_devid.c"
242
