crypto: skcipher - Fix skcipher_dequeue_givcrypt NULL test
[linux-2.6.git] / crypto / hash.c
1 /*
2  * Cryptographic Hash operations.
3  * 
4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the Free
8  * Software Foundation; either version 2 of the License, or (at your option) 
9  * any later version.
10  */
11
12 #include <crypto/internal/hash.h>
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/seq_file.h>
18
19 #include "internal.h"
20
21 static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
22                                         u32 mask)
23 {
24         return alg->cra_ctxsize;
25 }
26
27 static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key,
28                                  unsigned int keylen)
29 {
30         struct crypto_tfm *tfm = crypto_hash_tfm(crt);
31         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
32         unsigned long alignmask = crypto_hash_alignmask(crt);
33         int ret;
34         u8 *buffer, *alignbuffer;
35         unsigned long absize;
36
37         absize = keylen + alignmask;
38         buffer = kmalloc(absize, GFP_ATOMIC);
39         if (!buffer)
40                 return -ENOMEM;
41
42         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
43         memcpy(alignbuffer, key, keylen);
44         ret = alg->setkey(crt, alignbuffer, keylen);
45         memset(alignbuffer, 0, keylen);
46         kfree(buffer);
47         return ret;
48 }
49
50 static int hash_setkey(struct crypto_hash *crt, const u8 *key,
51                        unsigned int keylen)
52 {
53         struct crypto_tfm *tfm = crypto_hash_tfm(crt);
54         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
55         unsigned long alignmask = crypto_hash_alignmask(crt);
56
57         if ((unsigned long)key & alignmask)
58                 return hash_setkey_unaligned(crt, key, keylen);
59
60         return alg->setkey(crt, key, keylen);
61 }
62
63 static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
64                         unsigned int keylen)
65 {
66         struct crypto_tfm  *tfm      = crypto_ahash_tfm(tfm_async);
67         struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm);
68         struct hash_alg    *alg      = &tfm->__crt_alg->cra_hash;
69
70         return alg->setkey(tfm_hash, key, keylen);
71 }
72
73 static int hash_async_init(struct ahash_request *req)
74 {
75         struct crypto_tfm *tfm = req->base.tfm;
76         struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
77         struct hash_desc  desc = {
78                 .tfm = __crypto_hash_cast(tfm),
79                 .flags = req->base.flags,
80         };
81
82         return alg->init(&desc);
83 }
84
85 static int hash_async_update(struct ahash_request *req)
86 {
87         struct crypto_tfm *tfm = req->base.tfm;
88         struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
89         struct hash_desc  desc = {
90                 .tfm = __crypto_hash_cast(tfm),
91                 .flags = req->base.flags,
92         };
93
94         return alg->update(&desc, req->src, req->nbytes);
95 }
96
97 static int hash_async_final(struct ahash_request *req)
98 {
99         struct crypto_tfm *tfm = req->base.tfm;
100         struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
101         struct hash_desc  desc = {
102                 .tfm = __crypto_hash_cast(tfm),
103                 .flags = req->base.flags,
104         };
105
106         return alg->final(&desc, req->result);
107 }
108
109 static int hash_async_digest(struct ahash_request *req)
110 {
111         struct crypto_tfm *tfm = req->base.tfm;
112         struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
113         struct hash_desc  desc = {
114                 .tfm = __crypto_hash_cast(tfm),
115                 .flags = req->base.flags,
116         };
117
118         return alg->digest(&desc, req->src, req->nbytes, req->result);
119 }
120
121 static int crypto_init_hash_ops_async(struct crypto_tfm *tfm)
122 {
123         struct ahash_tfm *crt = &tfm->crt_ahash;
124         struct hash_alg  *alg = &tfm->__crt_alg->cra_hash;
125
126         crt->init       = hash_async_init;
127         crt->update     = hash_async_update;
128         crt->final      = hash_async_final;
129         crt->digest     = hash_async_digest;
130         crt->setkey     = hash_async_setkey;
131         crt->digestsize = alg->digestsize;
132
133         return 0;
134 }
135
136 static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm)
137 {
138         struct hash_tfm *crt = &tfm->crt_hash;
139         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
140
141         crt->init       = alg->init;
142         crt->update     = alg->update;
143         crt->final      = alg->final;
144         crt->digest     = alg->digest;
145         crt->setkey     = hash_setkey;
146         crt->digestsize = alg->digestsize;
147
148         return 0;
149 }
150
151 static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
152 {
153         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
154
155         if (alg->digestsize > PAGE_SIZE / 8)
156                 return -EINVAL;
157
158         if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)
159                 return crypto_init_hash_ops_async(tfm);
160         else
161                 return crypto_init_hash_ops_sync(tfm);
162 }
163
164 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
165         __attribute__ ((unused));
166 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
167 {
168         seq_printf(m, "type         : hash\n");
169         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
170         seq_printf(m, "digestsize   : %u\n", alg->cra_hash.digestsize);
171 }
172
173 const struct crypto_type crypto_hash_type = {
174         .ctxsize = crypto_hash_ctxsize,
175         .init = crypto_init_hash_ops,
176 #ifdef CONFIG_PROC_FS
177         .show = crypto_hash_show,
178 #endif
179 };
180 EXPORT_SYMBOL_GPL(crypto_hash_type);
181
182 MODULE_LICENSE("GPL");
183 MODULE_DESCRIPTION("Generic cryptographic hash type");