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)
14 #include <linux/crypto.h>
16 #include <linux/errno.h>
17 #include <linux/highmem.h>
18 #include <asm/scatterlist.h>
21 static void init(struct crypto_tfm
*tfm
)
23 tfm
->__crt_alg
->cra_digest
.dia_init(crypto_tfm_ctx(tfm
));
26 static void update(struct crypto_tfm
*tfm
,
27 struct scatterlist
*sg
, unsigned int nsg
)
30 unsigned int alignmask
= crypto_tfm_alg_alignmask(tfm
);
32 for (i
= 0; i
< nsg
; i
++) {
34 struct page
*pg
= sg
[i
].page
;
35 unsigned int offset
= sg
[i
].offset
;
36 unsigned int l
= sg
[i
].length
;
39 unsigned int bytes_from_page
= min(l
, ((unsigned int)
42 char *src
= crypto_kmap(pg
, 0);
43 char *p
= src
+ offset
;
45 if (unlikely(offset
& alignmask
)) {
47 alignmask
+ 1 - (offset
& alignmask
);
48 bytes
= min(bytes
, bytes_from_page
);
49 tfm
->__crt_alg
->cra_digest
.dia_update
50 (crypto_tfm_ctx(tfm
), p
,
53 bytes_from_page
-= bytes
;
56 tfm
->__crt_alg
->cra_digest
.dia_update
57 (crypto_tfm_ctx(tfm
), p
,
59 crypto_kunmap(src
, 0);
68 static void final(struct crypto_tfm
*tfm
, u8
*out
)
70 unsigned long alignmask
= crypto_tfm_alg_alignmask(tfm
);
71 if (unlikely((unsigned long)out
& alignmask
)) {
72 unsigned int size
= crypto_tfm_alg_digestsize(tfm
);
73 u8 buffer
[size
+ alignmask
];
74 u8
*dst
= (u8
*)ALIGN((unsigned long)buffer
, alignmask
+ 1);
75 tfm
->__crt_alg
->cra_digest
.dia_final(crypto_tfm_ctx(tfm
), dst
);
76 memcpy(out
, dst
, size
);
78 tfm
->__crt_alg
->cra_digest
.dia_final(crypto_tfm_ctx(tfm
), out
);
81 static int setkey(struct crypto_tfm
*tfm
, const u8
*key
, unsigned int keylen
)
84 if (tfm
->__crt_alg
->cra_digest
.dia_setkey
== NULL
)
86 return tfm
->__crt_alg
->cra_digest
.dia_setkey(crypto_tfm_ctx(tfm
),
90 static void digest(struct crypto_tfm
*tfm
,
91 struct scatterlist
*sg
, unsigned int nsg
, u8
*out
)
98 int crypto_init_digest_flags(struct crypto_tfm
*tfm
, u32 flags
)
100 return flags
? -EINVAL
: 0;
103 int crypto_init_digest_ops(struct crypto_tfm
*tfm
)
105 struct digest_tfm
*ops
= &tfm
->crt_digest
;
107 ops
->dit_init
= init
;
108 ops
->dit_update
= update
;
109 ops
->dit_final
= final
;
110 ops
->dit_digest
= digest
;
111 ops
->dit_setkey
= setkey
;
113 return crypto_alloc_hmac_block(tfm
);
116 void crypto_exit_digest_ops(struct crypto_tfm
*tfm
)
118 crypto_free_hmac_block(tfm
);
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