1 /*
2 * Cryptographic API.
3 *
4 * MD5 Message Digest Algorithm (RFC1321).
5 *
6 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
7 *
8 * Based on crypto/md5.c, which is:
9 *
10 * Derived from cryptoapi implementation, originally based on the
11 * public domain implementation written by Colin Plumb in 1993.
12 *
13 * Copyright (c) Cryptoapi developers.
14 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
15 *
16 * This program is free software; you can redistribute it and/or modify it
17 * under the terms of the GNU General Public License as published by the Free
18 * Software Foundation; either version 2 of the License, or (at your option)
19 * any later version.
20 */
21
22 #include <crypto/md5.h>
23 #include <linux/init.h>
24 #include <linux/types.h>
25 #include <linux/module.h>
26 #include <linux/string.h>
27 #include <asm/byteorder.h>
28 #include <asm/octeon/octeon.h>
29 #include <crypto/internal/hash.h>
30
31 #include "octeon-crypto.h"
32
33 /*
34 * We pass everything as 64-bit. OCTEON can handle misaligned data.
35 */
36
octeon_md5_store_hash(struct md5_state * ctx)37 static void octeon_md5_store_hash(struct md5_state *ctx)
38 {
39 u64 *hash = (u64 *)ctx->hash;
40
41 write_octeon_64bit_hash_dword(hash[0], 0);
42 write_octeon_64bit_hash_dword(hash[1], 1);
43 }
44
octeon_md5_read_hash(struct md5_state * ctx)45 static void octeon_md5_read_hash(struct md5_state *ctx)
46 {
47 u64 *hash = (u64 *)ctx->hash;
48
49 hash[0] = read_octeon_64bit_hash_dword(0);
50 hash[1] = read_octeon_64bit_hash_dword(1);
51 }
52
octeon_md5_transform(const void * _block)53 static void octeon_md5_transform(const void *_block)
54 {
55 const u64 *block = _block;
56
57 write_octeon_64bit_block_dword(block[0], 0);
58 write_octeon_64bit_block_dword(block[1], 1);
59 write_octeon_64bit_block_dword(block[2], 2);
60 write_octeon_64bit_block_dword(block[3], 3);
61 write_octeon_64bit_block_dword(block[4], 4);
62 write_octeon_64bit_block_dword(block[5], 5);
63 write_octeon_64bit_block_dword(block[6], 6);
64 octeon_md5_start(block[7]);
65 }
66
octeon_md5_init(struct shash_desc * desc)67 static int octeon_md5_init(struct shash_desc *desc)
68 {
69 struct md5_state *mctx = shash_desc_ctx(desc);
70
71 mctx->hash[0] = cpu_to_le32(MD5_H0);
72 mctx->hash[1] = cpu_to_le32(MD5_H1);
73 mctx->hash[2] = cpu_to_le32(MD5_H2);
74 mctx->hash[3] = cpu_to_le32(MD5_H3);
75 mctx->byte_count = 0;
76
77 return 0;
78 }
79
octeon_md5_update(struct shash_desc * desc,const u8 * data,unsigned int len)80 static int octeon_md5_update(struct shash_desc *desc, const u8 *data,
81 unsigned int len)
82 {
83 struct md5_state *mctx = shash_desc_ctx(desc);
84 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
85 struct octeon_cop2_state state;
86 unsigned long flags;
87
88 mctx->byte_count += len;
89
90 if (avail > len) {
91 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
92 data, len);
93 return 0;
94 }
95
96 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data,
97 avail);
98
99 flags = octeon_crypto_enable(&state);
100 octeon_md5_store_hash(mctx);
101
102 octeon_md5_transform(mctx->block);
103 data += avail;
104 len -= avail;
105
106 while (len >= sizeof(mctx->block)) {
107 octeon_md5_transform(data);
108 data += sizeof(mctx->block);
109 len -= sizeof(mctx->block);
110 }
111
112 octeon_md5_read_hash(mctx);
113 octeon_crypto_disable(&state, flags);
114
115 memcpy(mctx->block, data, len);
116
117 return 0;
118 }
119
octeon_md5_final(struct shash_desc * desc,u8 * out)120 static int octeon_md5_final(struct shash_desc *desc, u8 *out)
121 {
122 struct md5_state *mctx = shash_desc_ctx(desc);
123 const unsigned int offset = mctx->byte_count & 0x3f;
124 char *p = (char *)mctx->block + offset;
125 int padding = 56 - (offset + 1);
126 struct octeon_cop2_state state;
127 unsigned long flags;
128
129 *p++ = 0x80;
130
131 flags = octeon_crypto_enable(&state);
132 octeon_md5_store_hash(mctx);
133
134 if (padding < 0) {
135 memset(p, 0x00, padding + sizeof(u64));
136 octeon_md5_transform(mctx->block);
137 p = (char *)mctx->block;
138 padding = 56;
139 }
140
141 memset(p, 0, padding);
142 mctx->block[14] = cpu_to_le32(mctx->byte_count << 3);
143 mctx->block[15] = cpu_to_le32(mctx->byte_count >> 29);
144 octeon_md5_transform(mctx->block);
145
146 octeon_md5_read_hash(mctx);
147 octeon_crypto_disable(&state, flags);
148
149 memcpy(out, mctx->hash, sizeof(mctx->hash));
150 memset(mctx, 0, sizeof(*mctx));
151
152 return 0;
153 }
154
octeon_md5_export(struct shash_desc * desc,void * out)155 static int octeon_md5_export(struct shash_desc *desc, void *out)
156 {
157 struct md5_state *ctx = shash_desc_ctx(desc);
158
159 memcpy(out, ctx, sizeof(*ctx));
160 return 0;
161 }
162
octeon_md5_import(struct shash_desc * desc,const void * in)163 static int octeon_md5_import(struct shash_desc *desc, const void *in)
164 {
165 struct md5_state *ctx = shash_desc_ctx(desc);
166
167 memcpy(ctx, in, sizeof(*ctx));
168 return 0;
169 }
170
171 static struct shash_alg alg = {
172 .digestsize = MD5_DIGEST_SIZE,
173 .init = octeon_md5_init,
174 .update = octeon_md5_update,
175 .final = octeon_md5_final,
176 .export = octeon_md5_export,
177 .import = octeon_md5_import,
178 .descsize = sizeof(struct md5_state),
179 .statesize = sizeof(struct md5_state),
180 .base = {
181 .cra_name = "md5",
182 .cra_driver_name= "octeon-md5",
183 .cra_priority = OCTEON_CR_OPCODE_PRIORITY,
184 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
185 .cra_module = THIS_MODULE,
186 }
187 };
188
md5_mod_init(void)189 static int __init md5_mod_init(void)
190 {
191 if (!octeon_has_crypto())
192 return -ENOTSUPP;
193 return crypto_register_shash(&alg);
194 }
195
md5_mod_fini(void)196 static void __exit md5_mod_fini(void)
197 {
198 crypto_unregister_shash(&alg);
199 }
200
201 module_init(md5_mod_init);
202 module_exit(md5_mod_fini);
203
204 MODULE_LICENSE("GPL");
205 MODULE_DESCRIPTION("MD5 Message Digest Algorithm (OCTEON)");
206 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
207