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fa4dfedc DM |
1 | /* Glue code for MD5 hashing optimized for sparc64 crypto opcodes. |
2 | * | |
3 | * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c | |
4 | * and crypto/md5.c which are: | |
5 | * | |
6 | * Copyright (c) Alan Smithee. | |
7 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
8 | * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> | |
9 | * Copyright (c) Mathias Krause <minipli@googlemail.com> | |
10 | * Copyright (c) Cryptoapi developers. | |
11 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
12 | */ | |
13 | ||
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 | ||
10803624 DM |
27 | #include "opcodes.h" |
28 | ||
fa4dfedc DM |
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 | ||
c20fc09a LC |
36 | mctx->hash[0] = cpu_to_le32(MD5_H0); |
37 | mctx->hash[1] = cpu_to_le32(MD5_H1); | |
38 | mctx->hash[2] = cpu_to_le32(MD5_H2); | |
39 | mctx->hash[3] = cpu_to_le32(MD5_H3); | |
fa4dfedc DM |
40 | mctx->byte_count = 0; |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | static 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 | ||
66 | static 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 | /* Handle the fast case right here */ | |
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 | /* Add padding and return the message digest. */ | |
83 | static 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 | /* Pad out to 56 mod 64 and append length */ | |
94 | index = sctx->byte_count % MD5_HMAC_BLOCK_SIZE; | |
95 | padlen = (index < 56) ? (56 - index) : ((MD5_HMAC_BLOCK_SIZE+56) - index); | |
96 | ||
97 | /* We need to fill a whole block for __md5_sparc64_update() */ | |
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 | /* Store state in digest */ | |
107 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
108 | dst[i] = sctx->hash[i]; | |
109 | ||
110 | /* Wipe context */ | |
111 | memset(sctx, 0, sizeof(*sctx)); | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static 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 | ||
125 | static 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 | ||
134 | static 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", | |
10803624 | 146 | .cra_priority = SPARC_CR_OPCODE_PRIORITY, |
fa4dfedc DM |
147 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
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"); | |
97ef8ef5 | 186 | MODULE_DESCRIPTION("MD5 Message Digest Algorithm, sparc64 md5 opcode accelerated"); |
fa4dfedc | 187 | |
5d26a105 | 188 | MODULE_ALIAS_CRYPTO("md5"); |
226f7cea DM |
189 | |
190 | #include "crop_devid.c" |