1/*
2 * Cryptographic API.
3 *
4 * SHA-512 and SHA-384 Secure Hash Algorithm.
5 *
6 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
7 *
8 * Based on crypto/sha512_generic.c, which is:
9 *
10 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
11 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
12 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2, or (at your option) any
17 * later version.
18 */
19
20#include <linux/mm.h>
21#include <crypto/sha.h>
22#include <linux/init.h>
23#include <linux/types.h>
24#include <linux/module.h>
25#include <asm/byteorder.h>
26#include <asm/octeon/octeon.h>
27#include <crypto/internal/hash.h>
28
29#include "octeon-crypto.h"
30
31/*
32 * We pass everything as 64-bit. OCTEON can handle misaligned data.
33 */
34
35static void octeon_sha512_store_hash(struct sha512_state *sctx)
36{
37	write_octeon_64bit_hash_sha512(sctx->state[0], 0);
38	write_octeon_64bit_hash_sha512(sctx->state[1], 1);
39	write_octeon_64bit_hash_sha512(sctx->state[2], 2);
40	write_octeon_64bit_hash_sha512(sctx->state[3], 3);
41	write_octeon_64bit_hash_sha512(sctx->state[4], 4);
42	write_octeon_64bit_hash_sha512(sctx->state[5], 5);
43	write_octeon_64bit_hash_sha512(sctx->state[6], 6);
44	write_octeon_64bit_hash_sha512(sctx->state[7], 7);
45}
46
47static void octeon_sha512_read_hash(struct sha512_state *sctx)
48{
49	sctx->state[0] = read_octeon_64bit_hash_sha512(0);
50	sctx->state[1] = read_octeon_64bit_hash_sha512(1);
51	sctx->state[2] = read_octeon_64bit_hash_sha512(2);
52	sctx->state[3] = read_octeon_64bit_hash_sha512(3);
53	sctx->state[4] = read_octeon_64bit_hash_sha512(4);
54	sctx->state[5] = read_octeon_64bit_hash_sha512(5);
55	sctx->state[6] = read_octeon_64bit_hash_sha512(6);
56	sctx->state[7] = read_octeon_64bit_hash_sha512(7);
57}
58
59static void octeon_sha512_transform(const void *_block)
60{
61	const u64 *block = _block;
62
63	write_octeon_64bit_block_sha512(block[0], 0);
64	write_octeon_64bit_block_sha512(block[1], 1);
65	write_octeon_64bit_block_sha512(block[2], 2);
66	write_octeon_64bit_block_sha512(block[3], 3);
67	write_octeon_64bit_block_sha512(block[4], 4);
68	write_octeon_64bit_block_sha512(block[5], 5);
69	write_octeon_64bit_block_sha512(block[6], 6);
70	write_octeon_64bit_block_sha512(block[7], 7);
71	write_octeon_64bit_block_sha512(block[8], 8);
72	write_octeon_64bit_block_sha512(block[9], 9);
73	write_octeon_64bit_block_sha512(block[10], 10);
74	write_octeon_64bit_block_sha512(block[11], 11);
75	write_octeon_64bit_block_sha512(block[12], 12);
76	write_octeon_64bit_block_sha512(block[13], 13);
77	write_octeon_64bit_block_sha512(block[14], 14);
78	octeon_sha512_start(block[15]);
79}
80
81static int octeon_sha512_init(struct shash_desc *desc)
82{
83	struct sha512_state *sctx = shash_desc_ctx(desc);
84
85	sctx->state[0] = SHA512_H0;
86	sctx->state[1] = SHA512_H1;
87	sctx->state[2] = SHA512_H2;
88	sctx->state[3] = SHA512_H3;
89	sctx->state[4] = SHA512_H4;
90	sctx->state[5] = SHA512_H5;
91	sctx->state[6] = SHA512_H6;
92	sctx->state[7] = SHA512_H7;
93	sctx->count[0] = sctx->count[1] = 0;
94
95	return 0;
96}
97
98static int octeon_sha384_init(struct shash_desc *desc)
99{
100	struct sha512_state *sctx = shash_desc_ctx(desc);
101
102	sctx->state[0] = SHA384_H0;
103	sctx->state[1] = SHA384_H1;
104	sctx->state[2] = SHA384_H2;
105	sctx->state[3] = SHA384_H3;
106	sctx->state[4] = SHA384_H4;
107	sctx->state[5] = SHA384_H5;
108	sctx->state[6] = SHA384_H6;
109	sctx->state[7] = SHA384_H7;
110	sctx->count[0] = sctx->count[1] = 0;
111
112	return 0;
113}
114
115static void __octeon_sha512_update(struct sha512_state *sctx, const u8 *data,
116				   unsigned int len)
117{
118	unsigned int part_len;
119	unsigned int index;
120	unsigned int i;
121
122	/* Compute number of bytes mod 128. */
123	index = sctx->count[0] % SHA512_BLOCK_SIZE;
124
125	/* Update number of bytes. */
126	if ((sctx->count[0] += len) < len)
127		sctx->count[1]++;
128
129	part_len = SHA512_BLOCK_SIZE - index;
130
131	/* Transform as many times as possible. */
132	if (len >= part_len) {
133		memcpy(&sctx->buf[index], data, part_len);
134		octeon_sha512_transform(sctx->buf);
135
136		for (i = part_len; i + SHA512_BLOCK_SIZE <= len;
137			i += SHA512_BLOCK_SIZE)
138			octeon_sha512_transform(&data[i]);
139
140		index = 0;
141	} else {
142		i = 0;
143	}
144
145	/* Buffer remaining input. */
146	memcpy(&sctx->buf[index], &data[i], len - i);
147}
148
149static int octeon_sha512_update(struct shash_desc *desc, const u8 *data,
150				unsigned int len)
151{
152	struct sha512_state *sctx = shash_desc_ctx(desc);
153	struct octeon_cop2_state state;
154	unsigned long flags;
155
156	/*
157	 * Small updates never reach the crypto engine, so the generic sha512 is
158	 * faster because of the heavyweight octeon_crypto_enable() /
159	 * octeon_crypto_disable().
160	 */
161	if ((sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
162		return crypto_sha512_update(desc, data, len);
163
164	flags = octeon_crypto_enable(&state);
165	octeon_sha512_store_hash(sctx);
166
167	__octeon_sha512_update(sctx, data, len);
168
169	octeon_sha512_read_hash(sctx);
170	octeon_crypto_disable(&state, flags);
171
172	return 0;
173}
174
175static int octeon_sha512_final(struct shash_desc *desc, u8 *hash)
176{
177	struct sha512_state *sctx = shash_desc_ctx(desc);
178	static u8 padding[128] = { 0x80, };
179	struct octeon_cop2_state state;
180	__be64 *dst = (__be64 *)hash;
181	unsigned int pad_len;
182	unsigned long flags;
183	unsigned int index;
184	__be64 bits[2];
185	int i;
186
187	/* Save number of bits. */
188	bits[1] = cpu_to_be64(sctx->count[0] << 3);
189	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
190
191	/* Pad out to 112 mod 128. */
192	index = sctx->count[0] & 0x7f;
193	pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
194
195	flags = octeon_crypto_enable(&state);
196	octeon_sha512_store_hash(sctx);
197
198	__octeon_sha512_update(sctx, padding, pad_len);
199
200	/* Append length (before padding). */
201	__octeon_sha512_update(sctx, (const u8 *)bits, sizeof(bits));
202
203	octeon_sha512_read_hash(sctx);
204	octeon_crypto_disable(&state, flags);
205
206	/* Store state in digest. */
207	for (i = 0; i < 8; i++)
208		dst[i] = cpu_to_be64(sctx->state[i]);
209
210	/* Zeroize sensitive information. */
211	memset(sctx, 0, sizeof(struct sha512_state));
212
213	return 0;
214}
215
216static int octeon_sha384_final(struct shash_desc *desc, u8 *hash)
217{
218	u8 D[64];
219
220	octeon_sha512_final(desc, D);
221
222	memcpy(hash, D, 48);
223	memzero_explicit(D, 64);
224
225	return 0;
226}
227
228static struct shash_alg octeon_sha512_algs[2] = { {
229	.digestsize	=	SHA512_DIGEST_SIZE,
230	.init		=	octeon_sha512_init,
231	.update		=	octeon_sha512_update,
232	.final		=	octeon_sha512_final,
233	.descsize	=	sizeof(struct sha512_state),
234	.base		=	{
235		.cra_name	=	"sha512",
236		.cra_driver_name=	"octeon-sha512",
237		.cra_priority	=	OCTEON_CR_OPCODE_PRIORITY,
238		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
239		.cra_blocksize	=	SHA512_BLOCK_SIZE,
240		.cra_module	=	THIS_MODULE,
241	}
242}, {
243	.digestsize	=	SHA384_DIGEST_SIZE,
244	.init		=	octeon_sha384_init,
245	.update		=	octeon_sha512_update,
246	.final		=	octeon_sha384_final,
247	.descsize	=	sizeof(struct sha512_state),
248	.base		=	{
249		.cra_name	=	"sha384",
250		.cra_driver_name=	"octeon-sha384",
251		.cra_priority	=	OCTEON_CR_OPCODE_PRIORITY,
252		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
253		.cra_blocksize	=	SHA384_BLOCK_SIZE,
254		.cra_module	=	THIS_MODULE,
255	}
256} };
257
258static int __init octeon_sha512_mod_init(void)
259{
260	if (!octeon_has_crypto())
261		return -ENOTSUPP;
262	return crypto_register_shashes(octeon_sha512_algs,
263				       ARRAY_SIZE(octeon_sha512_algs));
264}
265
266static void __exit octeon_sha512_mod_fini(void)
267{
268	crypto_unregister_shashes(octeon_sha512_algs,
269				  ARRAY_SIZE(octeon_sha512_algs));
270}
271
272module_init(octeon_sha512_mod_init);
273module_exit(octeon_sha512_mod_fini);
274
275MODULE_LICENSE("GPL");
276MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms (OCTEON)");
277MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
278