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 
35 static 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 
47 static 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 
59 static 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 
81 static 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 
98 static 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 
115 static 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 
149 static 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 
175 static 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 
216 static 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 
228 static 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_blocksize	=	SHA512_BLOCK_SIZE,
239 		.cra_module	=	THIS_MODULE,
240 	}
241 }, {
242 	.digestsize	=	SHA384_DIGEST_SIZE,
243 	.init		=	octeon_sha384_init,
244 	.update		=	octeon_sha512_update,
245 	.final		=	octeon_sha384_final,
246 	.descsize	=	sizeof(struct sha512_state),
247 	.base		=	{
248 		.cra_name	=	"sha384",
249 		.cra_driver_name=	"octeon-sha384",
250 		.cra_priority	=	OCTEON_CR_OPCODE_PRIORITY,
251 		.cra_blocksize	=	SHA384_BLOCK_SIZE,
252 		.cra_module	=	THIS_MODULE,
253 	}
254 } };
255 
256 static int __init octeon_sha512_mod_init(void)
257 {
258 	if (!octeon_has_crypto())
259 		return -ENOTSUPP;
260 	return crypto_register_shashes(octeon_sha512_algs,
261 				       ARRAY_SIZE(octeon_sha512_algs));
262 }
263 
264 static void __exit octeon_sha512_mod_fini(void)
265 {
266 	crypto_unregister_shashes(octeon_sha512_algs,
267 				  ARRAY_SIZE(octeon_sha512_algs));
268 }
269 
270 module_init(octeon_sha512_mod_init);
271 module_exit(octeon_sha512_mod_fini);
272 
273 MODULE_LICENSE("GPL");
274 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms (OCTEON)");
275 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
276