1 /*
2 * Cryptographic API.
3 * Glue code for the SHA1 Secure Hash Algorithm assembler implementation
4 *
5 * This file is based on sha1_generic.c and sha1_ssse3_glue.c
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 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 *
17 */
18
19 #include <crypto/internal/hash.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/cryptohash.h>
23 #include <linux/types.h>
24 #include <crypto/sha.h>
25 #include <asm/byteorder.h>
26 #include <asm/crypto/sha1.h>
27
28
29 asmlinkage void sha1_block_data_order(u32 *digest,
30 const unsigned char *data, unsigned int rounds);
31
32
sha1_init(struct shash_desc * desc)33 static int sha1_init(struct shash_desc *desc)
34 {
35 struct sha1_state *sctx = shash_desc_ctx(desc);
36
37 *sctx = (struct sha1_state){
38 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
39 };
40
41 return 0;
42 }
43
44
__sha1_update(struct sha1_state * sctx,const u8 * data,unsigned int len,unsigned int partial)45 static int __sha1_update(struct sha1_state *sctx, const u8 *data,
46 unsigned int len, unsigned int partial)
47 {
48 unsigned int done = 0;
49
50 sctx->count += len;
51
52 if (partial) {
53 done = SHA1_BLOCK_SIZE - partial;
54 memcpy(sctx->buffer + partial, data, done);
55 sha1_block_data_order(sctx->state, sctx->buffer, 1);
56 }
57
58 if (len - done >= SHA1_BLOCK_SIZE) {
59 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
60 sha1_block_data_order(sctx->state, data + done, rounds);
61 done += rounds * SHA1_BLOCK_SIZE;
62 }
63
64 memcpy(sctx->buffer, data + done, len - done);
65 return 0;
66 }
67
68
sha1_update_arm(struct shash_desc * desc,const u8 * data,unsigned int len)69 int sha1_update_arm(struct shash_desc *desc, const u8 *data,
70 unsigned int len)
71 {
72 struct sha1_state *sctx = shash_desc_ctx(desc);
73 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
74 int res;
75
76 /* Handle the fast case right here */
77 if (partial + len < SHA1_BLOCK_SIZE) {
78 sctx->count += len;
79 memcpy(sctx->buffer + partial, data, len);
80 return 0;
81 }
82 res = __sha1_update(sctx, data, len, partial);
83 return res;
84 }
85 EXPORT_SYMBOL_GPL(sha1_update_arm);
86
87
88 /* Add padding and return the message digest. */
sha1_final(struct shash_desc * desc,u8 * out)89 static int sha1_final(struct shash_desc *desc, u8 *out)
90 {
91 struct sha1_state *sctx = shash_desc_ctx(desc);
92 unsigned int i, index, padlen;
93 __be32 *dst = (__be32 *)out;
94 __be64 bits;
95 static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
96
97 bits = cpu_to_be64(sctx->count << 3);
98
99 /* Pad out to 56 mod 64 and append length */
100 index = sctx->count % SHA1_BLOCK_SIZE;
101 padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
102 /* We need to fill a whole block for __sha1_update() */
103 if (padlen <= 56) {
104 sctx->count += padlen;
105 memcpy(sctx->buffer + index, padding, padlen);
106 } else {
107 __sha1_update(sctx, padding, padlen, index);
108 }
109 __sha1_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
110
111 /* Store state in digest */
112 for (i = 0; i < 5; i++)
113 dst[i] = cpu_to_be32(sctx->state[i]);
114
115 /* Wipe context */
116 memset(sctx, 0, sizeof(*sctx));
117 return 0;
118 }
119
120
sha1_export(struct shash_desc * desc,void * out)121 static int sha1_export(struct shash_desc *desc, void *out)
122 {
123 struct sha1_state *sctx = shash_desc_ctx(desc);
124 memcpy(out, sctx, sizeof(*sctx));
125 return 0;
126 }
127
128
sha1_import(struct shash_desc * desc,const void * in)129 static int sha1_import(struct shash_desc *desc, const void *in)
130 {
131 struct sha1_state *sctx = shash_desc_ctx(desc);
132 memcpy(sctx, in, sizeof(*sctx));
133 return 0;
134 }
135
136
137 static struct shash_alg alg = {
138 .digestsize = SHA1_DIGEST_SIZE,
139 .init = sha1_init,
140 .update = sha1_update_arm,
141 .final = sha1_final,
142 .export = sha1_export,
143 .import = sha1_import,
144 .descsize = sizeof(struct sha1_state),
145 .statesize = sizeof(struct sha1_state),
146 .base = {
147 .cra_name = "sha1",
148 .cra_driver_name= "sha1-asm",
149 .cra_priority = 150,
150 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
151 .cra_blocksize = SHA1_BLOCK_SIZE,
152 .cra_module = THIS_MODULE,
153 }
154 };
155
156
sha1_mod_init(void)157 static int __init sha1_mod_init(void)
158 {
159 return crypto_register_shash(&alg);
160 }
161
162
sha1_mod_fini(void)163 static void __exit sha1_mod_fini(void)
164 {
165 crypto_unregister_shash(&alg);
166 }
167
168
169 module_init(sha1_mod_init);
170 module_exit(sha1_mod_fini);
171
172 MODULE_LICENSE("GPL");
173 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (ARM)");
174 MODULE_ALIAS("sha1");
175 MODULE_AUTHOR("David McCullough <ucdevel@gmail.com>");
176