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