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4ff28d4c DM |
1 | /* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes. |
2 | * | |
3 | * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c | |
4 | * | |
5 | * Copyright (c) Alan Smithee. | |
6 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
7 | * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> | |
8 | * Copyright (c) Mathias Krause <minipli@googlemail.com> | |
9 | */ | |
10 | ||
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
12 | ||
13 | #include <crypto/internal/hash.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/cryptohash.h> | |
18 | #include <linux/types.h> | |
19 | #include <crypto/sha.h> | |
20 | ||
21 | #include <asm/pstate.h> | |
22 | #include <asm/elf.h> | |
23 | ||
10803624 DM |
24 | #include "opcodes.h" |
25 | ||
4ff28d4c DM |
26 | asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data, |
27 | unsigned int rounds); | |
28 | ||
29 | static int sha1_sparc64_init(struct shash_desc *desc) | |
30 | { | |
31 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
32 | ||
33 | *sctx = (struct sha1_state){ | |
34 | .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, | |
35 | }; | |
36 | ||
37 | return 0; | |
38 | } | |
39 | ||
40 | static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data, | |
41 | unsigned int len, unsigned int partial) | |
42 | { | |
43 | unsigned int done = 0; | |
44 | ||
45 | sctx->count += len; | |
46 | if (partial) { | |
47 | done = SHA1_BLOCK_SIZE - partial; | |
48 | memcpy(sctx->buffer + partial, data, done); | |
49 | sha1_sparc64_transform(sctx->state, sctx->buffer, 1); | |
50 | } | |
51 | if (len - done >= SHA1_BLOCK_SIZE) { | |
52 | const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; | |
53 | ||
54 | sha1_sparc64_transform(sctx->state, data + done, rounds); | |
55 | done += rounds * SHA1_BLOCK_SIZE; | |
56 | } | |
57 | ||
58 | memcpy(sctx->buffer, data + done, len - done); | |
59 | } | |
60 | ||
61 | static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data, | |
62 | unsigned int len) | |
63 | { | |
64 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
65 | unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; | |
66 | ||
67 | /* Handle the fast case right here */ | |
68 | if (partial + len < SHA1_BLOCK_SIZE) { | |
69 | sctx->count += len; | |
70 | memcpy(sctx->buffer + partial, data, len); | |
71 | } else | |
72 | __sha1_sparc64_update(sctx, data, len, partial); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | /* Add padding and return the message digest. */ | |
78 | static int sha1_sparc64_final(struct shash_desc *desc, u8 *out) | |
79 | { | |
80 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
81 | unsigned int i, index, padlen; | |
82 | __be32 *dst = (__be32 *)out; | |
83 | __be64 bits; | |
84 | static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; | |
85 | ||
86 | bits = cpu_to_be64(sctx->count << 3); | |
87 | ||
88 | /* Pad out to 56 mod 64 and append length */ | |
89 | index = sctx->count % SHA1_BLOCK_SIZE; | |
90 | padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index); | |
91 | ||
92 | /* We need to fill a whole block for __sha1_sparc64_update() */ | |
93 | if (padlen <= 56) { | |
94 | sctx->count += padlen; | |
95 | memcpy(sctx->buffer + index, padding, padlen); | |
96 | } else { | |
97 | __sha1_sparc64_update(sctx, padding, padlen, index); | |
98 | } | |
99 | __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56); | |
100 | ||
101 | /* Store state in digest */ | |
102 | for (i = 0; i < 5; i++) | |
103 | dst[i] = cpu_to_be32(sctx->state[i]); | |
104 | ||
105 | /* Wipe context */ | |
106 | memset(sctx, 0, sizeof(*sctx)); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int sha1_sparc64_export(struct shash_desc *desc, void *out) | |
112 | { | |
113 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
114 | ||
115 | memcpy(out, sctx, sizeof(*sctx)); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static int sha1_sparc64_import(struct shash_desc *desc, const void *in) | |
121 | { | |
122 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
123 | ||
124 | memcpy(sctx, in, sizeof(*sctx)); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static struct shash_alg alg = { | |
130 | .digestsize = SHA1_DIGEST_SIZE, | |
131 | .init = sha1_sparc64_init, | |
132 | .update = sha1_sparc64_update, | |
133 | .final = sha1_sparc64_final, | |
134 | .export = sha1_sparc64_export, | |
135 | .import = sha1_sparc64_import, | |
136 | .descsize = sizeof(struct sha1_state), | |
137 | .statesize = sizeof(struct sha1_state), | |
138 | .base = { | |
139 | .cra_name = "sha1", | |
140 | .cra_driver_name= "sha1-sparc64", | |
10803624 | 141 | .cra_priority = SPARC_CR_OPCODE_PRIORITY, |
4ff28d4c DM |
142 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
143 | .cra_blocksize = SHA1_BLOCK_SIZE, | |
144 | .cra_module = THIS_MODULE, | |
145 | } | |
146 | }; | |
147 | ||
148 | static bool __init sparc64_has_sha1_opcode(void) | |
149 | { | |
150 | unsigned long cfr; | |
151 | ||
152 | if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) | |
153 | return false; | |
154 | ||
155 | __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); | |
156 | if (!(cfr & CFR_SHA1)) | |
157 | return false; | |
158 | ||
159 | return true; | |
160 | } | |
161 | ||
162 | static int __init sha1_sparc64_mod_init(void) | |
163 | { | |
164 | if (sparc64_has_sha1_opcode()) { | |
165 | pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n"); | |
166 | return crypto_register_shash(&alg); | |
167 | } | |
168 | pr_info("sparc64 sha1 opcode not available.\n"); | |
169 | return -ENODEV; | |
170 | } | |
171 | ||
172 | static void __exit sha1_sparc64_mod_fini(void) | |
173 | { | |
174 | crypto_unregister_shash(&alg); | |
175 | } | |
176 | ||
177 | module_init(sha1_sparc64_mod_init); | |
178 | module_exit(sha1_sparc64_mod_fini); | |
179 | ||
180 | MODULE_LICENSE("GPL"); | |
181 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated"); | |
182 | ||
5d26a105 | 183 | MODULE_ALIAS_CRYPTO("sha1"); |
226f7cea DM |
184 | |
185 | #include "crop_devid.c" |