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
crypto_hash_ctxsize(struct crypto_alg * alg,u32 type,u32 mask)21 static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
22 u32 mask)
23 {
24 return alg->cra_ctxsize;
25 }
26
hash_setkey_unaligned(struct crypto_hash * crt,const u8 * key,unsigned int keylen)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
hash_setkey(struct crypto_hash * crt,const u8 * key,unsigned int keylen)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
hash_async_setkey(struct crypto_ahash * tfm_async,const u8 * key,unsigned int keylen)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
hash_async_init(struct ahash_request * req)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
hash_async_update(struct ahash_request * req)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
hash_async_final(struct ahash_request * req)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
hash_async_digest(struct ahash_request * req)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
crypto_init_hash_ops_async(struct crypto_tfm * tfm)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
crypto_init_hash_ops_sync(struct crypto_tfm * tfm)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
crypto_init_hash_ops(struct crypto_tfm * tfm,u32 type,u32 mask)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));
crypto_hash_show(struct seq_file * m,struct crypto_alg * alg)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");
184