1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Cryptographic API.
4 *
5 * SHA-224 and SHA-256 Secure Hash Algorithm.
6 *
7 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
8 *
9 * Based on crypto/sha256_generic.c, which is:
10 *
11 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
12 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
13 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
14 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
15 */
16
17#include <linux/mm.h>
18#include <crypto/sha.h>
19#include <linux/init.h>
20#include <linux/types.h>
21#include <linux/module.h>
22#include <asm/byteorder.h>
23#include <asm/octeon/octeon.h>
24#include <crypto/internal/hash.h>
25
26#include "octeon-crypto.h"
27
28/*
29 * We pass everything as 64-bit. OCTEON can handle misaligned data.
30 */
31
32static void octeon_sha256_store_hash(struct sha256_state *sctx)
33{
34	u64 *hash = (u64 *)sctx->state;
35
36	write_octeon_64bit_hash_dword(hash[0], 0);
37	write_octeon_64bit_hash_dword(hash[1], 1);
38	write_octeon_64bit_hash_dword(hash[2], 2);
39	write_octeon_64bit_hash_dword(hash[3], 3);
40}
41
42static void octeon_sha256_read_hash(struct sha256_state *sctx)
43{
44	u64 *hash = (u64 *)sctx->state;
45
46	hash[0] = read_octeon_64bit_hash_dword(0);
47	hash[1] = read_octeon_64bit_hash_dword(1);
48	hash[2] = read_octeon_64bit_hash_dword(2);
49	hash[3] = read_octeon_64bit_hash_dword(3);
50}
51
52static void octeon_sha256_transform(const void *_block)
53{
54	const u64 *block = _block;
55
56	write_octeon_64bit_block_dword(block[0], 0);
57	write_octeon_64bit_block_dword(block[1], 1);
58	write_octeon_64bit_block_dword(block[2], 2);
59	write_octeon_64bit_block_dword(block[3], 3);
60	write_octeon_64bit_block_dword(block[4], 4);
61	write_octeon_64bit_block_dword(block[5], 5);
62	write_octeon_64bit_block_dword(block[6], 6);
63	octeon_sha256_start(block[7]);
64}
65
66static int octeon_sha224_init(struct shash_desc *desc)
67{
68	struct sha256_state *sctx = shash_desc_ctx(desc);
69
70	sctx->state[0] = SHA224_H0;
71	sctx->state[1] = SHA224_H1;
72	sctx->state[2] = SHA224_H2;
73	sctx->state[3] = SHA224_H3;
74	sctx->state[4] = SHA224_H4;
75	sctx->state[5] = SHA224_H5;
76	sctx->state[6] = SHA224_H6;
77	sctx->state[7] = SHA224_H7;
78	sctx->count = 0;
79
80	return 0;
81}
82
83static int octeon_sha256_init(struct shash_desc *desc)
84{
85	struct sha256_state *sctx = shash_desc_ctx(desc);
86
87	sctx->state[0] = SHA256_H0;
88	sctx->state[1] = SHA256_H1;
89	sctx->state[2] = SHA256_H2;
90	sctx->state[3] = SHA256_H3;
91	sctx->state[4] = SHA256_H4;
92	sctx->state[5] = SHA256_H5;
93	sctx->state[6] = SHA256_H6;
94	sctx->state[7] = SHA256_H7;
95	sctx->count = 0;
96
97	return 0;
98}
99
100static void __octeon_sha256_update(struct sha256_state *sctx, const u8 *data,
101				   unsigned int len)
102{
103	unsigned int partial;
104	unsigned int done;
105	const u8 *src;
106
107	partial = sctx->count % SHA256_BLOCK_SIZE;
108	sctx->count += len;
109	done = 0;
110	src = data;
111
112	if ((partial + len) >= SHA256_BLOCK_SIZE) {
113		if (partial) {
114			done = -partial;
115			memcpy(sctx->buf + partial, data,
116			       done + SHA256_BLOCK_SIZE);
117			src = sctx->buf;
118		}
119
120		do {
121			octeon_sha256_transform(src);
122			done += SHA256_BLOCK_SIZE;
123			src = data + done;
124		} while (done + SHA256_BLOCK_SIZE <= len);
125
126		partial = 0;
127	}
128	memcpy(sctx->buf + partial, src, len - done);
129}
130
131static int octeon_sha256_update(struct shash_desc *desc, const u8 *data,
132				unsigned int len)
133{
134	struct sha256_state *sctx = shash_desc_ctx(desc);
135	struct octeon_cop2_state state;
136	unsigned long flags;
137
138	/*
139	 * Small updates never reach the crypto engine, so the generic sha256 is
140	 * faster because of the heavyweight octeon_crypto_enable() /
141	 * octeon_crypto_disable().
142	 */
143	if ((sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
144		return crypto_sha256_update(desc, data, len);
145
146	flags = octeon_crypto_enable(&state);
147	octeon_sha256_store_hash(sctx);
148
149	__octeon_sha256_update(sctx, data, len);
150
151	octeon_sha256_read_hash(sctx);
152	octeon_crypto_disable(&state, flags);
153
154	return 0;
155}
156
157static int octeon_sha256_final(struct shash_desc *desc, u8 *out)
158{
159	struct sha256_state *sctx = shash_desc_ctx(desc);
160	static const u8 padding[64] = { 0x80, };
161	struct octeon_cop2_state state;
162	__be32 *dst = (__be32 *)out;
163	unsigned int pad_len;
164	unsigned long flags;
165	unsigned int index;
166	__be64 bits;
167	int i;
168
169	/* Save number of bits. */
170	bits = cpu_to_be64(sctx->count << 3);
171
172	/* Pad out to 56 mod 64. */
173	index = sctx->count & 0x3f;
174	pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
175
176	flags = octeon_crypto_enable(&state);
177	octeon_sha256_store_hash(sctx);
178
179	__octeon_sha256_update(sctx, padding, pad_len);
180
181	/* Append length (before padding). */
182	__octeon_sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
183
184	octeon_sha256_read_hash(sctx);
185	octeon_crypto_disable(&state, flags);
186
187	/* Store state in digest */
188	for (i = 0; i < 8; i++)
189		dst[i] = cpu_to_be32(sctx->state[i]);
190
191	/* Zeroize sensitive information. */
192	memset(sctx, 0, sizeof(*sctx));
193
194	return 0;
195}
196
197static int octeon_sha224_final(struct shash_desc *desc, u8 *hash)
198{
199	u8 D[SHA256_DIGEST_SIZE];
200
201	octeon_sha256_final(desc, D);
202
203	memcpy(hash, D, SHA224_DIGEST_SIZE);
204	memzero_explicit(D, SHA256_DIGEST_SIZE);
205
206	return 0;
207}
208
209static int octeon_sha256_export(struct shash_desc *desc, void *out)
210{
211	struct sha256_state *sctx = shash_desc_ctx(desc);
212
213	memcpy(out, sctx, sizeof(*sctx));
214	return 0;
215}
216
217static int octeon_sha256_import(struct shash_desc *desc, const void *in)
218{
219	struct sha256_state *sctx = shash_desc_ctx(desc);
220
221	memcpy(sctx, in, sizeof(*sctx));
222	return 0;
223}
224
225static struct shash_alg octeon_sha256_algs[2] = { {
226	.digestsize	=	SHA256_DIGEST_SIZE,
227	.init		=	octeon_sha256_init,
228	.update		=	octeon_sha256_update,
229	.final		=	octeon_sha256_final,
230	.export		=	octeon_sha256_export,
231	.import		=	octeon_sha256_import,
232	.descsize	=	sizeof(struct sha256_state),
233	.statesize	=	sizeof(struct sha256_state),
234	.base		=	{
235		.cra_name	=	"sha256",
236		.cra_driver_name=	"octeon-sha256",
237		.cra_priority	=	OCTEON_CR_OPCODE_PRIORITY,
238		.cra_blocksize	=	SHA256_BLOCK_SIZE,
239		.cra_module	=	THIS_MODULE,
240	}
241}, {
242	.digestsize	=	SHA224_DIGEST_SIZE,
243	.init		=	octeon_sha224_init,
244	.update		=	octeon_sha256_update,
245	.final		=	octeon_sha224_final,
246	.descsize	=	sizeof(struct sha256_state),
247	.base		=	{
248		.cra_name	=	"sha224",
249		.cra_driver_name=	"octeon-sha224",
250		.cra_blocksize	=	SHA224_BLOCK_SIZE,
251		.cra_module	=	THIS_MODULE,
252	}
253} };
254
255static int __init octeon_sha256_mod_init(void)
256{
257	if (!octeon_has_crypto())
258		return -ENOTSUPP;
259	return crypto_register_shashes(octeon_sha256_algs,
260				       ARRAY_SIZE(octeon_sha256_algs));
261}
262
263static void __exit octeon_sha256_mod_fini(void)
264{
265	crypto_unregister_shashes(octeon_sha256_algs,
266				  ARRAY_SIZE(octeon_sha256_algs));
267}
268
269module_init(octeon_sha256_mod_init);
270module_exit(octeon_sha256_mod_fini);
271
272MODULE_LICENSE("GPL");
273MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)");
274MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
275