1
2
3
4
5
6
7
8
9
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <crypto/internal/hash.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/mm.h>
17#include <linux/cryptohash.h>
18#include <linux/types.h>
19#include <crypto/sha.h>
20
21#include <asm/pstate.h>
22#include <asm/elf.h>
23
24#include "opcodes.h"
25
26asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
27 unsigned int rounds);
28
29static int sha1_sparc64_init(struct shash_desc *desc)
30{
31 struct sha1_state *sctx = shash_desc_ctx(desc);
32
33 *sctx = (struct sha1_state){
34 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
35 };
36
37 return 0;
38}
39
40static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data,
41 unsigned int len, unsigned int partial)
42{
43 unsigned int done = 0;
44
45 sctx->count += len;
46 if (partial) {
47 done = SHA1_BLOCK_SIZE - partial;
48 memcpy(sctx->buffer + partial, data, done);
49 sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
50 }
51 if (len - done >= SHA1_BLOCK_SIZE) {
52 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
53
54 sha1_sparc64_transform(sctx->state, data + done, rounds);
55 done += rounds * SHA1_BLOCK_SIZE;
56 }
57
58 memcpy(sctx->buffer, data + done, len - done);
59}
60
61static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
62 unsigned int len)
63{
64 struct sha1_state *sctx = shash_desc_ctx(desc);
65 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
66
67
68 if (partial + len < SHA1_BLOCK_SIZE) {
69 sctx->count += len;
70 memcpy(sctx->buffer + partial, data, len);
71 } else
72 __sha1_sparc64_update(sctx, data, len, partial);
73
74 return 0;
75}
76
77
78static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
79{
80 struct sha1_state *sctx = shash_desc_ctx(desc);
81 unsigned int i, index, padlen;
82 __be32 *dst = (__be32 *)out;
83 __be64 bits;
84 static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
85
86 bits = cpu_to_be64(sctx->count << 3);
87
88
89 index = sctx->count % SHA1_BLOCK_SIZE;
90 padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
91
92
93 if (padlen <= 56) {
94 sctx->count += padlen;
95 memcpy(sctx->buffer + index, padding, padlen);
96 } else {
97 __sha1_sparc64_update(sctx, padding, padlen, index);
98 }
99 __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
100
101
102 for (i = 0; i < 5; i++)
103 dst[i] = cpu_to_be32(sctx->state[i]);
104
105
106 memset(sctx, 0, sizeof(*sctx));
107
108 return 0;
109}
110
111static int sha1_sparc64_export(struct shash_desc *desc, void *out)
112{
113 struct sha1_state *sctx = shash_desc_ctx(desc);
114
115 memcpy(out, sctx, sizeof(*sctx));
116
117 return 0;
118}
119
120static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
121{
122 struct sha1_state *sctx = shash_desc_ctx(desc);
123
124 memcpy(sctx, in, sizeof(*sctx));
125
126 return 0;
127}
128
129static struct shash_alg alg = {
130 .digestsize = SHA1_DIGEST_SIZE,
131 .init = sha1_sparc64_init,
132 .update = sha1_sparc64_update,
133 .final = sha1_sparc64_final,
134 .export = sha1_sparc64_export,
135 .import = sha1_sparc64_import,
136 .descsize = sizeof(struct sha1_state),
137 .statesize = sizeof(struct sha1_state),
138 .base = {
139 .cra_name = "sha1",
140 .cra_driver_name= "sha1-sparc64",
141 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
142 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
143 .cra_blocksize = SHA1_BLOCK_SIZE,
144 .cra_module = THIS_MODULE,
145 }
146};
147
148static bool __init sparc64_has_sha1_opcode(void)
149{
150 unsigned long cfr;
151
152 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
153 return false;
154
155 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
156 if (!(cfr & CFR_SHA1))
157 return false;
158
159 return true;
160}
161
162static int __init sha1_sparc64_mod_init(void)
163{
164 if (sparc64_has_sha1_opcode()) {
165 pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
166 return crypto_register_shash(&alg);
167 }
168 pr_info("sparc64 sha1 opcode not available.\n");
169 return -ENODEV;
170}
171
172static void __exit sha1_sparc64_mod_fini(void)
173{
174 crypto_unregister_shash(&alg);
175}
176
177module_init(sha1_sparc64_mod_init);
178module_exit(sha1_sparc64_mod_fini);
179
180MODULE_LICENSE("GPL");
181MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
182
183MODULE_ALIAS("sha1");
184
185#include "crop_devid.c"
186
