xref: /linux/arch/sparc/crypto/md5_glue.c (revision cdd38c5f1ce4398ec58fec95904b75824daab7b5)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Glue code for MD5 hashing optimized for sparc64 crypto opcodes.
3  *
4  * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
5  * and crypto/md5.c which are:
6  *
7  * Copyright (c) Alan Smithee.
8  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
9  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
10  * Copyright (c) Mathias Krause <minipli@googlemail.com>
11  * Copyright (c) Cryptoapi developers.
12  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
13  */
14 
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 
29 asmlinkage void md5_sparc64_transform(u32 *digest, const char *data,
30 				      unsigned int rounds);
31 
md5_sparc64_init(struct shash_desc * desc)32 static 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 
__md5_sparc64_update(struct md5_state * sctx,const u8 * data,unsigned int len,unsigned int partial)46 static 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 
md5_sparc64_update(struct shash_desc * desc,const u8 * data,unsigned int len)67 static 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. */
md5_sparc64_final(struct shash_desc * desc,u8 * out)84 static 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 
md5_sparc64_export(struct shash_desc * desc,void * out)117 static 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 
md5_sparc64_import(struct shash_desc * desc,const void * in)126 static 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 
135 static 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 
sparc64_has_md5_opcode(void)153 static 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 
md5_sparc64_mod_init(void)167 static 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 
md5_sparc64_mod_fini(void)177 static void __exit md5_sparc64_mod_fini(void)
178 {
179 	crypto_unregister_shash(&alg);
180 }
181 
182 module_init(md5_sparc64_mod_init);
183 module_exit(md5_sparc64_mod_fini);
184 
185 MODULE_LICENSE("GPL");
186 MODULE_DESCRIPTION("MD5 Message Digest Algorithm, sparc64 md5 opcode accelerated");
187 
188 MODULE_ALIAS_CRYPTO("md5");
189 
190 #include "crop_devid.c"
191