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
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
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
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. */
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
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
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
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
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
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
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