1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <crypto/internal/hash.h>
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/mm.h>
19#include <linux/types.h>
20#include <crypto/sha.h>
21#include <asm/byteorder.h>
22
23void powerpc_sha_transform(u32 *state, const u8 *src);
24
25static int powerpc_sha1_init(struct shash_desc *desc)
26{
27 struct sha1_state *sctx = shash_desc_ctx(desc);
28
29 *sctx = (struct sha1_state){
30 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
31 };
32
33 return 0;
34}
35
36static int powerpc_sha1_update(struct shash_desc *desc, const u8 *data,
37 unsigned int len)
38{
39 struct sha1_state *sctx = shash_desc_ctx(desc);
40 unsigned int partial, done;
41 const u8 *src;
42
43 partial = sctx->count & 0x3f;
44 sctx->count += len;
45 done = 0;
46 src = data;
47
48 if ((partial + len) > 63) {
49
50 if (partial) {
51 done = -partial;
52 memcpy(sctx->buffer + partial, data, done + 64);
53 src = sctx->buffer;
54 }
55
56 do {
57 powerpc_sha_transform(sctx->state, src);
58 done += 64;
59 src = data + done;
60 } while (done + 63 < len);
61
62 partial = 0;
63 }
64 memcpy(sctx->buffer + partial, src, len - done);
65
66 return 0;
67}
68
69
70
71static int powerpc_sha1_final(struct shash_desc *desc, u8 *out)
72{
73 struct sha1_state *sctx = shash_desc_ctx(desc);
74 __be32 *dst = (__be32 *)out;
75 u32 i, index, padlen;
76 __be64 bits;
77 static const u8 padding[64] = { 0x80, };
78
79 bits = cpu_to_be64(sctx->count << 3);
80
81
82 index = sctx->count & 0x3f;
83 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
84 powerpc_sha1_update(desc, padding, padlen);
85
86
87 powerpc_sha1_update(desc, (const u8 *)&bits, sizeof(bits));
88
89
90 for (i = 0; i < 5; i++)
91 dst[i] = cpu_to_be32(sctx->state[i]);
92
93
94 memset(sctx, 0, sizeof *sctx);
95
96 return 0;
97}
98
99static int powerpc_sha1_export(struct shash_desc *desc, void *out)
100{
101 struct sha1_state *sctx = shash_desc_ctx(desc);
102
103 memcpy(out, sctx, sizeof(*sctx));
104 return 0;
105}
106
107static int powerpc_sha1_import(struct shash_desc *desc, const void *in)
108{
109 struct sha1_state *sctx = shash_desc_ctx(desc);
110
111 memcpy(sctx, in, sizeof(*sctx));
112 return 0;
113}
114
115static struct shash_alg alg = {
116 .digestsize = SHA1_DIGEST_SIZE,
117 .init = powerpc_sha1_init,
118 .update = powerpc_sha1_update,
119 .final = powerpc_sha1_final,
120 .export = powerpc_sha1_export,
121 .import = powerpc_sha1_import,
122 .descsize = sizeof(struct sha1_state),
123 .statesize = sizeof(struct sha1_state),
124 .base = {
125 .cra_name = "sha1",
126 .cra_driver_name= "sha1-powerpc",
127 .cra_blocksize = SHA1_BLOCK_SIZE,
128 .cra_module = THIS_MODULE,
129 }
130};
131
132static int __init sha1_powerpc_mod_init(void)
133{
134 return crypto_register_shash(&alg);
135}
136
137static void __exit sha1_powerpc_mod_fini(void)
138{
139 crypto_unregister_shash(&alg);
140}
141
142module_init(sha1_powerpc_mod_init);
143module_exit(sha1_powerpc_mod_fini);
144
145MODULE_LICENSE("GPL");
146MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
147
148MODULE_ALIAS_CRYPTO("sha1");
149MODULE_ALIAS_CRYPTO("sha1-powerpc");
150