1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Glue code for MD5 implementation for PPC assembler
*
* Based on generic implementation.
*
* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
*/
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/md5.h>
#include <asm/byteorder.h>
extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks);
static inline void ppc_md5_clear_context(struct md5_state *sctx)
{
int count = sizeof(struct md5_state) >> 2;
u32 *ptr = (u32 *)sctx;
/* make sure we can clear the fast way */
BUILD_BUG_ON(sizeof(struct md5_state) % 4);
do { *ptr++ = 0; } while (--count);
}
static int ppc_md5_init(struct shash_desc *desc)
{
struct md5_state *sctx = shash_desc_ctx(desc);
sctx->hash[0] = MD5_H0;
sctx->hash[1] = MD5_H1;
sctx->hash[2] = MD5_H2;
sctx->hash[3] = MD5_H3;
sctx->byte_count = 0;
return 0;
}
static int ppc_md5_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct md5_state *sctx = shash_desc_ctx(desc);
const unsigned int offset = sctx->byte_count & 0x3f;
unsigned int avail = 64 - offset;
const u8 *src = data;
sctx->byte_count += len;
if (avail > len) {
memcpy((char *)sctx->block + offset, src, len);
return 0;
}
if (offset) {
memcpy((char *)sctx->block + offset, src, avail);
ppc_md5_transform(sctx->hash, (const u8 *)sctx->block, 1);
len -= avail;
src += avail;
}
if (len > 63) {
ppc_md5_transform(sctx->hash, src, len >> 6);
src += len & ~0x3f;
len &= 0x3f;
}
memcpy((char *)sctx->block, src, len);
return 0;
}
static int ppc_md5_final(struct shash_desc *desc, u8 *out)
{
struct md5_state *sctx = shash_desc_ctx(desc);
const unsigned int offset = sctx->byte_count & 0x3f;
const u8 *src = (const u8 *)sctx->block;
u8 *p = (u8 *)src + offset;
int padlen = 55 - offset;
__le64 *pbits = (__le64 *)((char *)sctx->block + 56);
__le32 *dst = (__le32 *)out;
*p++ = 0x80;
if (padlen < 0) {
memset(p, 0x00, padlen + sizeof (u64));
ppc_md5_transform(sctx->hash, src, 1);
p = (char *)sctx->block;
padlen = 56;
}
memset(p, 0, padlen);
*pbits = cpu_to_le64(sctx->byte_count << 3);
ppc_md5_transform(sctx->hash, src, 1);
dst[0] = cpu_to_le32(sctx->hash[0]);
dst[1] = cpu_to_le32(sctx->hash[1]);
dst[2] = cpu_to_le32(sctx->hash[2]);
dst[3] = cpu_to_le32(sctx->hash[3]);
ppc_md5_clear_context(sctx);
return 0;
}
static int ppc_md5_export(struct shash_desc *desc, void *out)
{
struct md5_state *sctx = shash_desc_ctx(desc);
memcpy(out, sctx, sizeof(*sctx));
return 0;
}
static int ppc_md5_import(struct shash_desc *desc, const void *in)
{
struct md5_state *sctx = shash_desc_ctx(desc);
memcpy(sctx, in, sizeof(*sctx));
return 0;
}
static struct shash_alg alg = {
.digestsize = MD5_DIGEST_SIZE,
.init = ppc_md5_init,
.update = ppc_md5_update,
.final = ppc_md5_final,
.export = ppc_md5_export,
.import = ppc_md5_import,
.descsize = sizeof(struct md5_state),
.statesize = sizeof(struct md5_state),
.base = {
.cra_name = "md5",
.cra_driver_name= "md5-ppc",
.cra_priority = 200,
.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
static int __init ppc_md5_mod_init(void)
{
return crypto_register_shash(&alg);
}
static void __exit ppc_md5_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
module_init(ppc_md5_mod_init);
module_exit(ppc_md5_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, PPC assembler");
MODULE_ALIAS_CRYPTO("md5");
MODULE_ALIAS_CRYPTO("md5-ppc");
|
