ALSA: hda - Merge HP mute-LED status callback on both IDT 92HD7x and 8x codecs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / crypto / sha1_generic.c
blob0416091bf45ad3854a5987a0d05d2c227cfdaeb3
1 /*
2 * Cryptographic API.
4 * SHA1 Secure Hash Algorithm.
6 * Derived from cryptoapi implementation, adapted for in-place
7 * scatterlist interface.
9 * Copyright (c) Alan Smithee.
10 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
11 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 2 of the License, or (at your option)
16 * any later version.
19 #include <crypto/internal/hash.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/cryptohash.h>
24 #include <linux/types.h>
25 #include <crypto/sha.h>
26 #include <asm/byteorder.h>
28 static int sha1_init(struct shash_desc *desc)
30 struct sha1_state *sctx = shash_desc_ctx(desc);
32 *sctx = (struct sha1_state){
33 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
36 return 0;
39 static int sha1_update(struct shash_desc *desc, const u8 *data,
40 unsigned int len)
42 struct sha1_state *sctx = shash_desc_ctx(desc);
43 unsigned int partial, done;
44 const u8 *src;
46 partial = sctx->count & 0x3f;
47 sctx->count += len;
48 done = 0;
49 src = data;
51 if ((partial + len) > 63) {
52 u32 temp[SHA_WORKSPACE_WORDS];
54 if (partial) {
55 done = -partial;
56 memcpy(sctx->buffer + partial, data, done + 64);
57 src = sctx->buffer;
60 do {
61 sha_transform(sctx->state, src, temp);
62 done += 64;
63 src = data + done;
64 } while (done + 63 < len);
66 memset(temp, 0, sizeof(temp));
67 partial = 0;
69 memcpy(sctx->buffer + partial, src, len - done);
71 return 0;
75 /* Add padding and return the message digest. */
76 static int sha1_final(struct shash_desc *desc, u8 *out)
78 struct sha1_state *sctx = shash_desc_ctx(desc);
79 __be32 *dst = (__be32 *)out;
80 u32 i, index, padlen;
81 __be64 bits;
82 static const u8 padding[64] = { 0x80, };
84 bits = cpu_to_be64(sctx->count << 3);
86 /* Pad out to 56 mod 64 */
87 index = sctx->count & 0x3f;
88 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
89 sha1_update(desc, padding, padlen);
91 /* Append length */
92 sha1_update(desc, (const u8 *)&bits, sizeof(bits));
94 /* Store state in digest */
95 for (i = 0; i < 5; i++)
96 dst[i] = cpu_to_be32(sctx->state[i]);
98 /* Wipe context */
99 memset(sctx, 0, sizeof *sctx);
101 return 0;
104 static int sha1_export(struct shash_desc *desc, void *out)
106 struct sha1_state *sctx = shash_desc_ctx(desc);
108 memcpy(out, sctx, sizeof(*sctx));
109 return 0;
112 static int sha1_import(struct shash_desc *desc, const void *in)
114 struct sha1_state *sctx = shash_desc_ctx(desc);
116 memcpy(sctx, in, sizeof(*sctx));
117 return 0;
120 static struct shash_alg alg = {
121 .digestsize = SHA1_DIGEST_SIZE,
122 .init = sha1_init,
123 .update = sha1_update,
124 .final = sha1_final,
125 .export = sha1_export,
126 .import = sha1_import,
127 .descsize = sizeof(struct sha1_state),
128 .statesize = sizeof(struct sha1_state),
129 .base = {
130 .cra_name = "sha1",
131 .cra_driver_name= "sha1-generic",
132 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
133 .cra_blocksize = SHA1_BLOCK_SIZE,
134 .cra_module = THIS_MODULE,
138 static int __init sha1_generic_mod_init(void)
140 return crypto_register_shash(&alg);
143 static void __exit sha1_generic_mod_fini(void)
145 crypto_unregister_shash(&alg);
148 module_init(sha1_generic_mod_init);
149 module_exit(sha1_generic_mod_fini);
151 MODULE_LICENSE("GPL");
152 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
154 MODULE_ALIAS("sha1");