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e90508d3 MS |
1 | /* |
2 | * Glue code for MD5 implementation for PPC assembler | |
3 | * | |
4 | * Based on generic implementation. | |
5 | * | |
6 | * Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
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/cryptohash.h> | |
20 | #include <linux/types.h> | |
21 | #include <crypto/md5.h> | |
22 | #include <asm/byteorder.h> | |
23 | ||
24 | extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks); | |
25 | ||
26 | static inline void ppc_md5_clear_context(struct md5_state *sctx) | |
27 | { | |
28 | int count = sizeof(struct md5_state) >> 2; | |
29 | u32 *ptr = (u32 *)sctx; | |
30 | ||
31 | /* make sure we can clear the fast way */ | |
32 | BUILD_BUG_ON(sizeof(struct md5_state) % 4); | |
33 | do { *ptr++ = 0; } while (--count); | |
34 | } | |
35 | ||
36 | static int ppc_md5_init(struct shash_desc *desc) | |
37 | { | |
38 | struct md5_state *sctx = shash_desc_ctx(desc); | |
39 | ||
a4015213 LC |
40 | sctx->hash[0] = MD5_H0; |
41 | sctx->hash[1] = MD5_H1; | |
42 | sctx->hash[2] = MD5_H2; | |
43 | sctx->hash[3] = MD5_H3; | |
e90508d3 MS |
44 | sctx->byte_count = 0; |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static int ppc_md5_update(struct shash_desc *desc, const u8 *data, | |
50 | unsigned int len) | |
51 | { | |
52 | struct md5_state *sctx = shash_desc_ctx(desc); | |
53 | const unsigned int offset = sctx->byte_count & 0x3f; | |
54 | unsigned int avail = 64 - offset; | |
55 | const u8 *src = data; | |
56 | ||
57 | sctx->byte_count += len; | |
58 | ||
59 | if (avail > len) { | |
60 | memcpy((char *)sctx->block + offset, src, len); | |
61 | return 0; | |
62 | } | |
63 | ||
64 | if (offset) { | |
65 | memcpy((char *)sctx->block + offset, src, avail); | |
66 | ppc_md5_transform(sctx->hash, (const u8 *)sctx->block, 1); | |
67 | len -= avail; | |
68 | src += avail; | |
69 | } | |
70 | ||
71 | if (len > 63) { | |
72 | ppc_md5_transform(sctx->hash, src, len >> 6); | |
73 | src += len & ~0x3f; | |
74 | len &= 0x3f; | |
75 | } | |
76 | ||
77 | memcpy((char *)sctx->block, src, len); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static int ppc_md5_final(struct shash_desc *desc, u8 *out) | |
82 | { | |
83 | struct md5_state *sctx = shash_desc_ctx(desc); | |
84 | const unsigned int offset = sctx->byte_count & 0x3f; | |
85 | const u8 *src = (const u8 *)sctx->block; | |
86 | u8 *p = (u8 *)src + offset; | |
87 | int padlen = 55 - offset; | |
88 | __le64 *pbits = (__le64 *)((char *)sctx->block + 56); | |
89 | __le32 *dst = (__le32 *)out; | |
90 | ||
91 | *p++ = 0x80; | |
92 | ||
93 | if (padlen < 0) { | |
94 | memset(p, 0x00, padlen + sizeof (u64)); | |
95 | ppc_md5_transform(sctx->hash, src, 1); | |
96 | p = (char *)sctx->block; | |
97 | padlen = 56; | |
98 | } | |
99 | ||
100 | memset(p, 0, padlen); | |
101 | *pbits = cpu_to_le64(sctx->byte_count << 3); | |
102 | ppc_md5_transform(sctx->hash, src, 1); | |
103 | ||
104 | dst[0] = cpu_to_le32(sctx->hash[0]); | |
105 | dst[1] = cpu_to_le32(sctx->hash[1]); | |
106 | dst[2] = cpu_to_le32(sctx->hash[2]); | |
107 | dst[3] = cpu_to_le32(sctx->hash[3]); | |
108 | ||
109 | ppc_md5_clear_context(sctx); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static int ppc_md5_export(struct shash_desc *desc, void *out) | |
114 | { | |
115 | struct md5_state *sctx = shash_desc_ctx(desc); | |
116 | ||
117 | memcpy(out, sctx, sizeof(*sctx)); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int ppc_md5_import(struct shash_desc *desc, const void *in) | |
122 | { | |
123 | struct md5_state *sctx = shash_desc_ctx(desc); | |
124 | ||
125 | memcpy(sctx, in, sizeof(*sctx)); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static struct shash_alg alg = { | |
130 | .digestsize = MD5_DIGEST_SIZE, | |
131 | .init = ppc_md5_init, | |
132 | .update = ppc_md5_update, | |
133 | .final = ppc_md5_final, | |
134 | .export = ppc_md5_export, | |
135 | .import = ppc_md5_import, | |
136 | .descsize = sizeof(struct md5_state), | |
137 | .statesize = sizeof(struct md5_state), | |
138 | .base = { | |
139 | .cra_name = "md5", | |
140 | .cra_driver_name= "md5-ppc", | |
141 | .cra_priority = 200, | |
142 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
143 | .cra_blocksize = MD5_HMAC_BLOCK_SIZE, | |
144 | .cra_module = THIS_MODULE, | |
145 | } | |
146 | }; | |
147 | ||
148 | static int __init ppc_md5_mod_init(void) | |
149 | { | |
150 | return crypto_register_shash(&alg); | |
151 | } | |
152 | ||
153 | static void __exit ppc_md5_mod_fini(void) | |
154 | { | |
155 | crypto_unregister_shash(&alg); | |
156 | } | |
157 | ||
158 | module_init(ppc_md5_mod_init); | |
159 | module_exit(ppc_md5_mod_fini); | |
160 | ||
161 | MODULE_LICENSE("GPL"); | |
162 | MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, PPC assembler"); | |
163 | ||
164 | MODULE_ALIAS_CRYPTO("md5"); | |
165 | MODULE_ALIAS_CRYPTO("md5-ppc"); |