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 <linux/cryptohash.h>
29#include <asm/octeon/octeon.h>
30#include <crypto/internal/hash.h>
31
32#include "octeon-crypto.h"
33
34/*
35 * We pass everything as 64-bit. OCTEON can handle misaligned data.
36 */
37
38static void octeon_md5_store_hash(struct md5_state *ctx)
39{
40	u64 *hash = (u64 *)ctx->hash;
41
42	write_octeon_64bit_hash_dword(hash[0], 0);
43	write_octeon_64bit_hash_dword(hash[1], 1);
44}
45
46static void octeon_md5_read_hash(struct md5_state *ctx)
47{
48	u64 *hash = (u64 *)ctx->hash;
49
50	hash[0] = read_octeon_64bit_hash_dword(0);
51	hash[1] = read_octeon_64bit_hash_dword(1);
52}
53
54static void octeon_md5_transform(const void *_block)
55{
56	const u64 *block = _block;
57
58	write_octeon_64bit_block_dword(block[0], 0);
59	write_octeon_64bit_block_dword(block[1], 1);
60	write_octeon_64bit_block_dword(block[2], 2);
61	write_octeon_64bit_block_dword(block[3], 3);
62	write_octeon_64bit_block_dword(block[4], 4);
63	write_octeon_64bit_block_dword(block[5], 5);
64	write_octeon_64bit_block_dword(block[6], 6);
65	octeon_md5_start(block[7]);
66}
67
68static int octeon_md5_init(struct shash_desc *desc)
69{
70	struct md5_state *mctx = shash_desc_ctx(desc);
71
72	mctx->hash[0] = cpu_to_le32(0x67452301);
73	mctx->hash[1] = cpu_to_le32(0xefcdab89);
74	mctx->hash[2] = cpu_to_le32(0x98badcfe);
75	mctx->hash[3] = cpu_to_le32(0x10325476);
76	mctx->byte_count = 0;
77
78	return 0;
79}
80
81static int octeon_md5_update(struct shash_desc *desc, const u8 *data,
82			     unsigned int len)
83{
84	struct md5_state *mctx = shash_desc_ctx(desc);
85	const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
86	struct octeon_cop2_state state;
87	unsigned long flags;
88
89	mctx->byte_count += len;
90
91	if (avail > len) {
92		memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
93		       data, len);
94		return 0;
95	}
96
97	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data,
98	       avail);
99
100	flags = octeon_crypto_enable(&state);
101	octeon_md5_store_hash(mctx);
102
103	octeon_md5_transform(mctx->block);
104	data += avail;
105	len -= avail;
106
107	while (len >= sizeof(mctx->block)) {
108		octeon_md5_transform(data);
109		data += sizeof(mctx->block);
110		len -= sizeof(mctx->block);
111	}
112
113	octeon_md5_read_hash(mctx);
114	octeon_crypto_disable(&state, flags);
115
116	memcpy(mctx->block, data, len);
117
118	return 0;
119}
120
121static int octeon_md5_final(struct shash_desc *desc, u8 *out)
122{
123	struct md5_state *mctx = shash_desc_ctx(desc);
124	const unsigned int offset = mctx->byte_count & 0x3f;
125	char *p = (char *)mctx->block + offset;
126	int padding = 56 - (offset + 1);
127	struct octeon_cop2_state state;
128	unsigned long flags;
129
130	*p++ = 0x80;
131
132	flags = octeon_crypto_enable(&state);
133	octeon_md5_store_hash(mctx);
134
135	if (padding < 0) {
136		memset(p, 0x00, padding + sizeof(u64));
137		octeon_md5_transform(mctx->block);
138		p = (char *)mctx->block;
139		padding = 56;
140	}
141
142	memset(p, 0, padding);
143	mctx->block[14] = cpu_to_le32(mctx->byte_count << 3);
144	mctx->block[15] = cpu_to_le32(mctx->byte_count >> 29);
145	octeon_md5_transform(mctx->block);
146
147	octeon_md5_read_hash(mctx);
148	octeon_crypto_disable(&state, flags);
149
150	memcpy(out, mctx->hash, sizeof(mctx->hash));
151	memset(mctx, 0, sizeof(*mctx));
152
153	return 0;
154}
155
156static int octeon_md5_export(struct shash_desc *desc, void *out)
157{
158	struct md5_state *ctx = shash_desc_ctx(desc);
159
160	memcpy(out, ctx, sizeof(*ctx));
161	return 0;
162}
163
164static int octeon_md5_import(struct shash_desc *desc, const void *in)
165{
166	struct md5_state *ctx = shash_desc_ctx(desc);
167
168	memcpy(ctx, in, sizeof(*ctx));
169	return 0;
170}
171
172static struct shash_alg alg = {
173	.digestsize	=	MD5_DIGEST_SIZE,
174	.init		=	octeon_md5_init,
175	.update		=	octeon_md5_update,
176	.final		=	octeon_md5_final,
177	.export		=	octeon_md5_export,
178	.import		=	octeon_md5_import,
179	.descsize	=	sizeof(struct md5_state),
180	.statesize	=	sizeof(struct md5_state),
181	.base		=	{
182		.cra_name	=	"md5",
183		.cra_driver_name=	"octeon-md5",
184		.cra_priority	=	OCTEON_CR_OPCODE_PRIORITY,
185		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
186		.cra_blocksize	=	MD5_HMAC_BLOCK_SIZE,
187		.cra_module	=	THIS_MODULE,
188	}
189};
190
191static int __init md5_mod_init(void)
192{
193	if (!octeon_has_crypto())
194		return -ENOTSUPP;
195	return crypto_register_shash(&alg);
196}
197
198static void __exit md5_mod_fini(void)
199{
200	crypto_unregister_shash(&alg);
201}
202
203module_init(md5_mod_init);
204module_exit(md5_mod_fini);
205
206MODULE_LICENSE("GPL");
207MODULE_DESCRIPTION("MD5 Message Digest Algorithm (OCTEON)");
208MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
209