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14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <crypto/internal/hash.h>
17#include <linux/init.h>
18#include <linux/module.h>
19#include <linux/mm.h>
20#include <linux/cryptohash.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] = cpu_to_le32(0x67452301);
37 mctx->hash[1] = cpu_to_le32(0xefcdab89);
38 mctx->hash[2] = cpu_to_le32(0x98badcfe);
39 mctx->hash[3] = cpu_to_le32(0x10325476);
40 mctx->byte_count = 0;
41
42 return 0;
43}
44
45static void __md5_sparc64_update(struct md5_state *sctx, const u8 *data,
46 unsigned int len, unsigned int partial)
47{
48 unsigned int done = 0;
49
50 sctx->byte_count += len;
51 if (partial) {
52 done = MD5_HMAC_BLOCK_SIZE - partial;
53 memcpy((u8 *)sctx->block + partial, data, done);
54 md5_sparc64_transform(sctx->hash, (u8 *)sctx->block, 1);
55 }
56 if (len - done >= MD5_HMAC_BLOCK_SIZE) {
57 const unsigned int rounds = (len - done) / MD5_HMAC_BLOCK_SIZE;
58
59 md5_sparc64_transform(sctx->hash, data + done, rounds);
60 done += rounds * MD5_HMAC_BLOCK_SIZE;
61 }
62
63 memcpy(sctx->block, data + done, len - done);
64}
65
66static int md5_sparc64_update(struct shash_desc *desc, const u8 *data,
67 unsigned int len)
68{
69 struct md5_state *sctx = shash_desc_ctx(desc);
70 unsigned int partial = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
71
72
73 if (partial + len < MD5_HMAC_BLOCK_SIZE) {
74 sctx->byte_count += len;
75 memcpy((u8 *)sctx->block + partial, data, len);
76 } else
77 __md5_sparc64_update(sctx, data, len, partial);
78
79 return 0;
80}
81
82
83static int md5_sparc64_final(struct shash_desc *desc, u8 *out)
84{
85 struct md5_state *sctx = shash_desc_ctx(desc);
86 unsigned int i, index, padlen;
87 u32 *dst = (u32 *)out;
88 __le64 bits;
89 static const u8 padding[MD5_HMAC_BLOCK_SIZE] = { 0x80, };
90
91 bits = cpu_to_le64(sctx->byte_count << 3);
92
93
94 index = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
95 padlen = (index < 56) ? (56 - index) : ((MD5_HMAC_BLOCK_SIZE+56) - index);
96
97
98 if (padlen <= 56) {
99 sctx->byte_count += padlen;
100 memcpy((u8 *)sctx->block + index, padding, padlen);
101 } else {
102 __md5_sparc64_update(sctx, padding, padlen, index);
103 }
104 __md5_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
105
106
107 for (i = 0; i < MD5_HASH_WORDS; i++)
108 dst[i] = sctx->hash[i];
109
110
111 memset(sctx, 0, sizeof(*sctx));
112
113 return 0;
114}
115
116static int md5_sparc64_export(struct shash_desc *desc, void *out)
117{
118 struct md5_state *sctx = shash_desc_ctx(desc);
119
120 memcpy(out, sctx, sizeof(*sctx));
121
122 return 0;
123}
124
125static int md5_sparc64_import(struct shash_desc *desc, const void *in)
126{
127 struct md5_state *sctx = shash_desc_ctx(desc);
128
129 memcpy(sctx, in, sizeof(*sctx));
130
131 return 0;
132}
133
134static struct shash_alg alg = {
135 .digestsize = MD5_DIGEST_SIZE,
136 .init = md5_sparc64_init,
137 .update = md5_sparc64_update,
138 .final = md5_sparc64_final,
139 .export = md5_sparc64_export,
140 .import = md5_sparc64_import,
141 .descsize = sizeof(struct md5_state),
142 .statesize = sizeof(struct md5_state),
143 .base = {
144 .cra_name = "md5",
145 .cra_driver_name= "md5-sparc64",
146 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
147 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
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 Secure Hash Algorithm, sparc64 md5 opcode accelerated");
187
188MODULE_ALIAS_CRYPTO("md5");
189
190#include "crop_devid.c"
191
