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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - crypto/digest.c
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(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(tfm
, p
,
52 bytes_from_page
-= bytes
;
55 tfm
->__crt_alg
->cra_digest
.dia_update(tfm
, p
,
57 crypto_kunmap(src
, 0);
58 crypto_yield(tfm
->crt_flags
);
66 static void final(struct crypto_tfm
*tfm
, u8
*out
)
68 unsigned long alignmask
= crypto_tfm_alg_alignmask(tfm
);
69 struct digest_alg
*digest
= &tfm
->__crt_alg
->cra_digest
;
71 if (unlikely((unsigned long)out
& alignmask
)) {
72 unsigned long align
= alignmask
+ 1;
73 unsigned long addr
= (unsigned long)crypto_tfm_ctx(tfm
);
74 u8
*dst
= (u8
*)ALIGN(addr
, align
) +
75 ALIGN(tfm
->__crt_alg
->cra_ctxsize
, align
);
77 digest
->dia_final(tfm
, dst
);
78 memcpy(out
, dst
, digest
->dia_digestsize
);
80 digest
->dia_final(tfm
, out
);
83 static int nosetkey(struct crypto_tfm
*tfm
, const u8
*key
, unsigned int keylen
)
85 tfm
->crt_flags
&= ~CRYPTO_TFM_RES_MASK
;
89 static int setkey(struct crypto_tfm
*tfm
, const u8
*key
, unsigned int keylen
)
91 tfm
->crt_flags
&= ~CRYPTO_TFM_RES_MASK
;
92 return tfm
->__crt_alg
->cra_digest
.dia_setkey(tfm
, key
, keylen
);
95 static void digest(struct crypto_tfm
*tfm
,
96 struct scatterlist
*sg
, unsigned int nsg
, u8
*out
)
103 int crypto_init_digest_flags(struct crypto_tfm
*tfm
, u32 flags
)
105 return flags
? -EINVAL
: 0;
108 int crypto_init_digest_ops(struct crypto_tfm
*tfm
)
110 struct digest_tfm
*ops
= &tfm
->crt_digest
;
111 struct digest_alg
*dalg
= &tfm
->__crt_alg
->cra_digest
;
113 ops
->dit_init
= init
;
114 ops
->dit_update
= update
;
115 ops
->dit_final
= final
;
116 ops
->dit_digest
= digest
;
117 ops
->dit_setkey
= dalg
->dia_setkey
? setkey
: nosetkey
;
119 return crypto_alloc_hmac_block(tfm
);
122 void crypto_exit_digest_ops(struct crypto_tfm
*tfm
)
124 crypto_free_hmac_block(tfm
);