6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
15 #include <crypto/internal/hash.h>
16 #include <crypto/scatterwalk.h>
18 #include <linux/errno.h>
19 #include <linux/hardirq.h>
20 #include <linux/highmem.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/scatterlist.h>
27 static int init(struct hash_desc
*desc
)
29 struct crypto_tfm
*tfm
= crypto_hash_tfm(desc
->tfm
);
31 tfm
->__crt_alg
->cra_digest
.dia_init(tfm
);
35 static int update2(struct hash_desc
*desc
,
36 struct scatterlist
*sg
, unsigned int nbytes
)
38 struct crypto_tfm
*tfm
= crypto_hash_tfm(desc
->tfm
);
39 unsigned int alignmask
= crypto_tfm_alg_alignmask(tfm
);
45 struct page
*pg
= sg_page(sg
);
46 unsigned int offset
= sg
->offset
;
47 unsigned int l
= sg
->length
;
49 if (unlikely(l
> nbytes
))
54 unsigned int bytes_from_page
= min(l
, ((unsigned int)
57 char *src
= crypto_kmap(pg
, 0);
58 char *p
= src
+ offset
;
60 if (unlikely(offset
& alignmask
)) {
62 alignmask
+ 1 - (offset
& alignmask
);
63 bytes
= min(bytes
, bytes_from_page
);
64 tfm
->__crt_alg
->cra_digest
.dia_update(tfm
, p
,
67 bytes_from_page
-= bytes
;
70 tfm
->__crt_alg
->cra_digest
.dia_update(tfm
, p
,
72 crypto_kunmap(src
, 0);
73 crypto_yield(desc
->flags
);
81 sg
= scatterwalk_sg_next(sg
);
87 static int update(struct hash_desc
*desc
,
88 struct scatterlist
*sg
, unsigned int nbytes
)
90 if (WARN_ON_ONCE(in_irq()))
92 return update2(desc
, sg
, nbytes
);
95 static int final(struct hash_desc
*desc
, u8
*out
)
97 struct crypto_tfm
*tfm
= crypto_hash_tfm(desc
->tfm
);
98 unsigned long alignmask
= crypto_tfm_alg_alignmask(tfm
);
99 struct digest_alg
*digest
= &tfm
->__crt_alg
->cra_digest
;
101 if (unlikely((unsigned long)out
& alignmask
)) {
102 unsigned long align
= alignmask
+ 1;
103 unsigned long addr
= (unsigned long)crypto_tfm_ctx(tfm
);
104 u8
*dst
= (u8
*)ALIGN(addr
, align
) +
105 ALIGN(tfm
->__crt_alg
->cra_ctxsize
, align
);
107 digest
->dia_final(tfm
, dst
);
108 memcpy(out
, dst
, digest
->dia_digestsize
);
110 digest
->dia_final(tfm
, out
);
115 static int nosetkey(struct crypto_hash
*tfm
, const u8
*key
, unsigned int keylen
)
117 crypto_hash_clear_flags(tfm
, CRYPTO_TFM_RES_MASK
);
121 static int setkey(struct crypto_hash
*hash
, const u8
*key
, unsigned int keylen
)
123 struct crypto_tfm
*tfm
= crypto_hash_tfm(hash
);
125 crypto_hash_clear_flags(hash
, CRYPTO_TFM_RES_MASK
);
126 return tfm
->__crt_alg
->cra_digest
.dia_setkey(tfm
, key
, keylen
);
129 static int digest(struct hash_desc
*desc
,
130 struct scatterlist
*sg
, unsigned int nbytes
, u8
*out
)
132 if (WARN_ON_ONCE(in_irq()))
136 update2(desc
, sg
, nbytes
);
137 return final(desc
, out
);
140 int crypto_init_digest_ops(struct crypto_tfm
*tfm
)
142 struct hash_tfm
*ops
= &tfm
->crt_hash
;
143 struct digest_alg
*dalg
= &tfm
->__crt_alg
->cra_digest
;
145 if (dalg
->dia_digestsize
> PAGE_SIZE
/ 8)
149 ops
->update
= update
;
151 ops
->digest
= digest
;
152 ops
->setkey
= dalg
->dia_setkey
? setkey
: nosetkey
;
153 ops
->digestsize
= dalg
->dia_digestsize
;
158 void crypto_exit_digest_ops(struct crypto_tfm
*tfm
)
162 static int digest_async_nosetkey(struct crypto_ahash
*tfm_async
, const u8
*key
,
165 crypto_ahash_clear_flags(tfm_async
, CRYPTO_TFM_RES_MASK
);
169 static int digest_async_setkey(struct crypto_ahash
*tfm_async
, const u8
*key
,
172 struct crypto_tfm
*tfm
= crypto_ahash_tfm(tfm_async
);
173 struct digest_alg
*dalg
= &tfm
->__crt_alg
->cra_digest
;
175 crypto_ahash_clear_flags(tfm_async
, CRYPTO_TFM_RES_MASK
);
176 return dalg
->dia_setkey(tfm
, key
, keylen
);
179 static int digest_async_init(struct ahash_request
*req
)
181 struct crypto_tfm
*tfm
= req
->base
.tfm
;
182 struct digest_alg
*dalg
= &tfm
->__crt_alg
->cra_digest
;
188 static int digest_async_update(struct ahash_request
*req
)
190 struct crypto_tfm
*tfm
= req
->base
.tfm
;
191 struct hash_desc desc
= {
192 .tfm
= __crypto_hash_cast(tfm
),
193 .flags
= req
->base
.flags
,
196 update(&desc
, req
->src
, req
->nbytes
);
200 static int digest_async_final(struct ahash_request
*req
)
202 struct crypto_tfm
*tfm
= req
->base
.tfm
;
203 struct hash_desc desc
= {
204 .tfm
= __crypto_hash_cast(tfm
),
205 .flags
= req
->base
.flags
,
208 final(&desc
, req
->result
);
212 static int digest_async_digest(struct ahash_request
*req
)
214 struct crypto_tfm
*tfm
= req
->base
.tfm
;
215 struct hash_desc desc
= {
216 .tfm
= __crypto_hash_cast(tfm
),
217 .flags
= req
->base
.flags
,
220 return digest(&desc
, req
->src
, req
->nbytes
, req
->result
);
223 int crypto_init_digest_ops_async(struct crypto_tfm
*tfm
)
225 struct ahash_tfm
*crt
= &tfm
->crt_ahash
;
226 struct digest_alg
*dalg
= &tfm
->__crt_alg
->cra_digest
;
228 if (dalg
->dia_digestsize
> PAGE_SIZE
/ 8)
231 crt
->init
= digest_async_init
;
232 crt
->update
= digest_async_update
;
233 crt
->final
= digest_async_final
;
234 crt
->digest
= digest_async_digest
;
235 crt
->setkey
= dalg
->dia_setkey
? digest_async_setkey
:
236 digest_async_nosetkey
;
237 crt
->digestsize
= dalg
->dia_digestsize
;
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