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
37static 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
45static 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
53static 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
67static 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
80static 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
120static 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
155static 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
163static 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
171static 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
189static int __init md5_mod_init(void)
190{
191	if (!octeon_has_crypto())
192		return -ENOTSUPP;
193	return crypto_register_shash(&alg);
194}
195
196static void __exit md5_mod_fini(void)
197{
198	crypto_unregister_shash(&alg);
199}
200
201module_init(md5_mod_init);
202module_exit(md5_mod_fini);
203
204MODULE_LICENSE("GPL");
205MODULE_DESCRIPTION("MD5 Message Digest Algorithm (OCTEON)");
206MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
207