]>
git.proxmox.com Git - mirror_ubuntu-jammy-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(crypto_tfm_ctx(tfm
));
26 static void update(struct crypto_tfm
*tfm
,
27 struct scatterlist
*sg
, unsigned int nsg
)
31 for (i
= 0; i
< nsg
; i
++) {
33 struct page
*pg
= sg
[i
].page
;
34 unsigned int offset
= sg
[i
].offset
;
35 unsigned int l
= sg
[i
].length
;
38 unsigned int bytes_from_page
= min(l
, ((unsigned int)
41 char *p
= crypto_kmap(pg
, 0) + offset
;
43 tfm
->__crt_alg
->cra_digest
.dia_update
44 (crypto_tfm_ctx(tfm
), p
,
55 static void final(struct crypto_tfm
*tfm
, u8
*out
)
57 tfm
->__crt_alg
->cra_digest
.dia_final(crypto_tfm_ctx(tfm
), out
);
60 static int setkey(struct crypto_tfm
*tfm
, const u8
*key
, unsigned int keylen
)
63 if (tfm
->__crt_alg
->cra_digest
.dia_setkey
== NULL
)
65 return tfm
->__crt_alg
->cra_digest
.dia_setkey(crypto_tfm_ctx(tfm
),
69 static void digest(struct crypto_tfm
*tfm
,
70 struct scatterlist
*sg
, unsigned int nsg
, u8
*out
)
74 tfm
->crt_digest
.dit_init(tfm
);
76 for (i
= 0; i
< nsg
; i
++) {
77 char *p
= crypto_kmap(sg
[i
].page
, 0) + sg
[i
].offset
;
78 tfm
->__crt_alg
->cra_digest
.dia_update(crypto_tfm_ctx(tfm
),
83 crypto_digest_final(tfm
, out
);
86 int crypto_init_digest_flags(struct crypto_tfm
*tfm
, u32 flags
)
88 return flags
? -EINVAL
: 0;
91 int crypto_init_digest_ops(struct crypto_tfm
*tfm
)
93 struct digest_tfm
*ops
= &tfm
->crt_digest
;
96 ops
->dit_update
= update
;
97 ops
->dit_final
= final
;
98 ops
->dit_digest
= digest
;
99 ops
->dit_setkey
= setkey
;
101 return crypto_alloc_hmac_block(tfm
);
104 void crypto_exit_digest_ops(struct crypto_tfm
*tfm
)
106 crypto_free_hmac_block(tfm
);