1133359Sobrien// SPDX-License-Identifier: GPL-2.0-only
2133359Sobrien/* Glue code for MD5 hashing optimized for sparc64 crypto opcodes.
3226048Sobrien *
4133359Sobrien * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
5226048Sobrien * and crypto/md5.c which are:
6133359Sobrien *
7133359Sobrien * Copyright (c) Alan Smithee.
8133359Sobrien * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
9133359Sobrien * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
10133359Sobrien * Copyright (c) Mathias Krause <minipli@googlemail.com>
11133359Sobrien * Copyright (c) Cryptoapi developers.
12133359Sobrien * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
13133359Sobrien */
14226048Sobrien
15#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
16
17#include <crypto/internal/hash.h>
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/mm.h>
21#include <linux/types.h>
22#include <crypto/md5.h>
23
24#include <asm/pstate.h>
25#include <asm/elf.h>
26
27#include "opcodes.h"
28
29asmlinkage void md5_sparc64_transform(u32 *digest, const char *data,
30				      unsigned int rounds);
31
32static int md5_sparc64_init(struct shash_desc *desc)
33{
34	struct md5_state *mctx = shash_desc_ctx(desc);
35
36	mctx->hash[0] = MD5_H0;
37	mctx->hash[1] = MD5_H1;
38	mctx->hash[2] = MD5_H2;
39	mctx->hash[3] = MD5_H3;
40	le32_to_cpu_array(mctx->hash, 4);
41	mctx->byte_count = 0;
42
43	return 0;
44}
45
46static void __md5_sparc64_update(struct md5_state *sctx, const u8 *data,
47				 unsigned int len, unsigned int partial)
48{
49	unsigned int done = 0;
50
51	sctx->byte_count += len;
52	if (partial) {
53		done = MD5_HMAC_BLOCK_SIZE - partial;
54		memcpy((u8 *)sctx->block + partial, data, done);
55		md5_sparc64_transform(sctx->hash, (u8 *)sctx->block, 1);
56	}
57	if (len - done >= MD5_HMAC_BLOCK_SIZE) {
58		const unsigned int rounds = (len - done) / MD5_HMAC_BLOCK_SIZE;
59
60		md5_sparc64_transform(sctx->hash, data + done, rounds);
61		done += rounds * MD5_HMAC_BLOCK_SIZE;
62	}
63
64	memcpy(sctx->block, data + done, len - done);
65}
66
67static int md5_sparc64_update(struct shash_desc *desc, const u8 *data,
68			      unsigned int len)
69{
70	struct md5_state *sctx = shash_desc_ctx(desc);
71	unsigned int partial = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
72
73	/* Handle the fast case right here */
74	if (partial + len < MD5_HMAC_BLOCK_SIZE) {
75		sctx->byte_count += len;
76		memcpy((u8 *)sctx->block + partial, data, len);
77	} else
78		__md5_sparc64_update(sctx, data, len, partial);
79
80	return 0;
81}
82
83/* Add padding and return the message digest. */
84static int md5_sparc64_final(struct shash_desc *desc, u8 *out)
85{
86	struct md5_state *sctx = shash_desc_ctx(desc);
87	unsigned int i, index, padlen;
88	u32 *dst = (u32 *)out;
89	__le64 bits;
90	static const u8 padding[MD5_HMAC_BLOCK_SIZE] = { 0x80, };
91
92	bits = cpu_to_le64(sctx->byte_count << 3);
93
94	/* Pad out to 56 mod 64 and append length */
95	index = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
96	padlen = (index < 56) ? (56 - index) : ((MD5_HMAC_BLOCK_SIZE+56) - index);
97
98	/* We need to fill a whole block for __md5_sparc64_update() */
99	if (padlen <= 56) {
100		sctx->byte_count += padlen;
101		memcpy((u8 *)sctx->block + index, padding, padlen);
102	} else {
103		__md5_sparc64_update(sctx, padding, padlen, index);
104	}
105	__md5_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
106
107	/* Store state in digest */
108	for (i = 0; i < MD5_HASH_WORDS; i++)
109		dst[i] = sctx->hash[i];
110
111	/* Wipe context */
112	memset(sctx, 0, sizeof(*sctx));
113
114	return 0;
115}
116
117static int md5_sparc64_export(struct shash_desc *desc, void *out)
118{
119	struct md5_state *sctx = shash_desc_ctx(desc);
120
121	memcpy(out, sctx, sizeof(*sctx));
122
123	return 0;
124}
125
126static int md5_sparc64_import(struct shash_desc *desc, const void *in)
127{
128	struct md5_state *sctx = shash_desc_ctx(desc);
129
130	memcpy(sctx, in, sizeof(*sctx));
131
132	return 0;
133}
134
135static struct shash_alg alg = {
136	.digestsize	=	MD5_DIGEST_SIZE,
137	.init		=	md5_sparc64_init,
138	.update		=	md5_sparc64_update,
139	.final		=	md5_sparc64_final,
140	.export		=	md5_sparc64_export,
141	.import		=	md5_sparc64_import,
142	.descsize	=	sizeof(struct md5_state),
143	.statesize	=	sizeof(struct md5_state),
144	.base		=	{
145		.cra_name	=	"md5",
146		.cra_driver_name=	"md5-sparc64",
147		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
148		.cra_blocksize	=	MD5_HMAC_BLOCK_SIZE,
149		.cra_module	=	THIS_MODULE,
150	}
151};
152
153static bool __init sparc64_has_md5_opcode(void)
154{
155	unsigned long cfr;
156
157	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
158		return false;
159
160	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
161	if (!(cfr & CFR_MD5))
162		return false;
163
164	return true;
165}
166
167static int __init md5_sparc64_mod_init(void)
168{
169	if (sparc64_has_md5_opcode()) {
170		pr_info("Using sparc64 md5 opcode optimized MD5 implementation\n");
171		return crypto_register_shash(&alg);
172	}
173	pr_info("sparc64 md5 opcode not available.\n");
174	return -ENODEV;
175}
176
177static void __exit md5_sparc64_mod_fini(void)
178{
179	crypto_unregister_shash(&alg);
180}
181
182module_init(md5_sparc64_mod_init);
183module_exit(md5_sparc64_mod_fini);
184
185MODULE_LICENSE("GPL");
186MODULE_DESCRIPTION("MD5 Message Digest Algorithm, sparc64 md5 opcode accelerated");
187
188MODULE_ALIAS_CRYPTO("md5");
189
190#include "crop_devid.c"
191