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SmartisanOS_Kernel_Source/crypto/aead.c at master · Dave-Tech-NZ/SmartisanOS_Kernel_Source · GitHub
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/*
* AEAD: Authenticated Encryption with Associated Data
*
* This file provides API support for AEAD algorithms.
*
* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include
<crypto/internal/aead.h>
#include
<linux/err.h>
#include
<linux/init.h>
#include
<linux/kernel.h>
#include
<linux/module.h>
#include
<linux/rtnetlink.h>
#include
<linux/sched.h>
#include
<linux/slab.h>
#include
<linux/seq_file.h>
#include
<linux/cryptouser.h>
#include
<net/netlink.h>
#include
"internal.h"
static
int
setkey_unaligned
(
struct
crypto_aead
*
tfm
,
const
u8
*
key
,
unsigned
int
keylen
)
{
struct
aead_alg
*
aead
=
crypto_aead_alg
(
tfm
);
unsigned long
alignmask
=
crypto_aead_alignmask
(
tfm
);
int
ret
;
u8
*
buffer
,
*
alignbuffer
;
unsigned long
absize
;
absize
=
keylen
+
alignmask
;
buffer
=
kmalloc
(
absize
,
GFP_ATOMIC
);
if
(!
buffer
)
return
-
ENOMEM
;
alignbuffer
=
(
u8
*
)
ALIGN
((
unsigned long
)
buffer
,
alignmask
+
1
);
memcpy
(
alignbuffer
,
key
,
keylen
);
ret
=
aead
->
setkey
(
tfm
,
alignbuffer
,
keylen
);
memset
(
alignbuffer
,
0
,
keylen
);
kfree
(
buffer
);
return
ret
;
}
static
int
setkey
(
struct
crypto_aead
*
tfm
,
const
u8
*
key
,
unsigned
int
keylen
)
{
struct
aead_alg
*
aead
=
crypto_aead_alg
(
tfm
);
unsigned long
alignmask
=
crypto_aead_alignmask
(
tfm
);
if
((
unsigned long
)
key
&
alignmask
)
return
setkey_unaligned
(
tfm
,
key
,
keylen
);
return
aead
->
setkey
(
tfm
,
key
,
keylen
);
}
int
crypto_aead_setauthsize
(
struct
crypto_aead
*
tfm
,
unsigned
int
authsize
)
{
struct
aead_tfm
*
crt
=
crypto_aead_crt
(
tfm
);
int
err
;
if
(
authsize
>
crypto_aead_alg
(
tfm
)
->
maxauthsize
)
return
-
EINVAL
;
if
(
crypto_aead_alg
(
tfm
)
->
setauthsize
) {
err
=
crypto_aead_alg
(
tfm
)
->
setauthsize
(
crt
->
base
,
authsize
);
if
(
err
)
return
err
;
}
crypto_aead_crt
(
crt
->
base
)
->
authsize
=
authsize
;
crt
->
authsize
=
authsize
;
return
0
;
}
EXPORT_SYMBOL_GPL
(
crypto_aead_setauthsize
);
static
unsigned
int
crypto_aead_ctxsize
(
struct
crypto_alg
*
alg
,
u32
type
,
u32
mask
)
{
return
alg
->
cra_ctxsize
;
}
static
int
no_givcrypt
(
struct
aead_givcrypt_request
*
req
)
{
return
-
ENOSYS
;
}
static
int
crypto_init_aead_ops
(
struct
crypto_tfm
*
tfm
,
u32
type
,
u32
mask
)
{
struct
aead_alg
*
alg
=
&
tfm
->
__crt_alg
->
cra_aead
;
struct
aead_tfm
*
crt
=
&
tfm
->
crt_aead
;
if
(
max
(
alg
->
maxauthsize
,
alg
->
ivsize
)
>
PAGE_SIZE
/
8
)
return
-
EINVAL
;
crt
->
setkey
=
tfm
->
__crt_alg
->
cra_flags
&
CRYPTO_ALG_GENIV
?
alg
->
setkey
:
setkey
;
crt
->
encrypt
=
alg
->
encrypt
;
crt
->
decrypt
=
alg
->
decrypt
;
crt
->
givencrypt
=
alg
->
givencrypt
?:
no_givcrypt
;
crt
->
givdecrypt
=
alg
->
givdecrypt
?:
no_givcrypt
;
crt
->
base
=
__crypto_aead_cast
(
tfm
);
crt
->
ivsize
=
alg
->
ivsize
;
crt
->
authsize
=
alg
->
maxauthsize
;
return
0
;
}
#ifdef
CONFIG_NET
static
int
crypto_aead_report
(
struct
sk_buff
*
skb
,
struct
crypto_alg
*
alg
)
{
struct
crypto_report_aead
raead
;
struct
aead_alg
*
aead
=
&
alg
->
cra_aead
;
snprintf
(
raead
.
type
,
CRYPTO_MAX_ALG_NAME
,
"%s"
,
"aead"
);
snprintf
(
raead
.
geniv
,
CRYPTO_MAX_ALG_NAME
,
"%s"
,
aead
->
geniv
?:
"<built-in>"
);
raead
.
blocksize
=
alg
->
cra_blocksize
;
raead
.
maxauthsize
=
aead
->
maxauthsize
;
raead
.
ivsize
=
aead
->
ivsize
;
NLA_PUT
(
skb
,
CRYPTOCFGA_REPORT_AEAD
,
sizeof
(
struct
crypto_report_aead
),
&
raead
);
return
0
;
nla_put_failure
:
return
-
EMSGSIZE
;
}
#else
static
int
crypto_aead_report
(
struct
sk_buff
*
skb
,
struct
crypto_alg
*
alg
)
{
return
-
ENOSYS
;
}
#endif
static
void
crypto_aead_show
(
struct
seq_file
*
m
,
struct
crypto_alg
*
alg
)
__attribute__ ((
unused
));
static
void
crypto_aead_show
(
struct
seq_file
*
m
,
struct
crypto_alg
*
alg
)
{
struct
aead_alg
*
aead
=
&
alg
->
cra_aead
;
seq_printf
(
m
,
"type : aead\n"
);
seq_printf
(
m
,
"async : %s\n"
,
alg
->
cra_flags
&
CRYPTO_ALG_ASYNC
?
"yes"
:
"no"
);
seq_printf
(
m
,
"blocksize : %u\n"
,
alg
->
cra_blocksize
);
seq_printf
(
m
,
"ivsize : %u\n"
,
aead
->
ivsize
);
seq_printf
(
m
,
"maxauthsize : %u\n"
,
aead
->
maxauthsize
);
seq_printf
(
m
,
"geniv : %s\n"
,
aead
->
geniv
?:
"<built-in>"
);
}
const
struct
crypto_type
crypto_aead_type
=
{
.
ctxsize
=
crypto_aead_ctxsize
,
.
init
=
crypto_init_aead_ops
,
#ifdef
CONFIG_PROC_FS
.
show
=
crypto_aead_show
,
#endif
.
report
=
crypto_aead_report
,
};
EXPORT_SYMBOL_GPL
(
crypto_aead_type
);
static
int
aead_null_givencrypt
(
struct
aead_givcrypt_request
*
req
)
{
return
crypto_aead_encrypt
(
&
req
->
areq
);
}
static
int
aead_null_givdecrypt
(
struct
aead_givcrypt_request
*
req
)
{
return
crypto_aead_decrypt
(
&
req
->
areq
);
}
static
int
crypto_init_nivaead_ops
(
struct
crypto_tfm
*
tfm
,
u32
type
,
u32
mask
)
{
struct
aead_alg
*
alg
=
&
tfm
->
__crt_alg
->
cra_aead
;
struct
aead_tfm
*
crt
=
&
tfm
->
crt_aead
;
if
(
max
(
alg
->
maxauthsize
,
alg
->
ivsize
)
>
PAGE_SIZE
/
8
)
return
-
EINVAL
;
crt
->
setkey
=
setkey
;
crt
->
encrypt
=
alg
->
encrypt
;
crt
->
decrypt
=
alg
->
decrypt
;
if
(!
alg
->
ivsize
) {
crt
->
givencrypt
=
aead_null_givencrypt
;
crt
->
givdecrypt
=
aead_null_givdecrypt
;
}
crt
->
base
=
__crypto_aead_cast
(
tfm
);
crt
->
ivsize
=
alg
->
ivsize
;
crt
->
authsize
=
alg
->
maxauthsize
;
return
0
;
}
#ifdef
CONFIG_NET
static
int
crypto_nivaead_report
(
struct
sk_buff
*
skb
,
struct
crypto_alg
*
alg
)
{
struct
crypto_report_aead
raead
;
struct
aead_alg
*
aead
=
&
alg
->
cra_aead
;
snprintf
(
raead
.
type
,
CRYPTO_MAX_ALG_NAME
,
"%s"
,
"nivaead"
);
snprintf
(
raead
.
geniv
,
CRYPTO_MAX_ALG_NAME
,
"%s"
,
aead
->
geniv
);
raead
.
blocksize
=
alg
->
cra_blocksize
;
raead
.
maxauthsize
=
aead
->
maxauthsize
;
raead
.
ivsize
=
aead
->
ivsize
;
NLA_PUT
(
skb
,
CRYPTOCFGA_REPORT_AEAD
,
sizeof
(
struct
crypto_report_aead
),
&
raead
);
return
0
;
nla_put_failure
:
return
-
EMSGSIZE
;
}
#else
static
int
crypto_nivaead_report
(
struct
sk_buff
*
skb
,
struct
crypto_alg
*
alg
)
{
return
-
ENOSYS
;
}
#endif
static
void
crypto_nivaead_show
(
struct
seq_file
*
m
,
struct
crypto_alg
*
alg
)
__attribute__ ((
unused
));
static
void
crypto_nivaead_show
(
struct
seq_file
*
m
,
struct
crypto_alg
*
alg
)
{
struct
aead_alg
*
aead
=
&
alg
->
cra_aead
;
seq_printf
(
m
,
"type : nivaead\n"
);
seq_printf
(
m
,
"async : %s\n"
,
alg
->
cra_flags
&
CRYPTO_ALG_ASYNC
?
"yes"
:
"no"
);
seq_printf
(
m
,
"blocksize : %u\n"
,
alg
->
cra_blocksize
);
seq_printf
(
m
,
"ivsize : %u\n"
,
aead
->
ivsize
);
seq_printf
(
m
,
"maxauthsize : %u\n"
,
aead
->
maxauthsize
);
seq_printf
(
m
,
"geniv : %s\n"
,
aead
->
geniv
);
}
const
struct
crypto_type
crypto_nivaead_type
=
{
.
ctxsize
=
crypto_aead_ctxsize
,
.
init
=
crypto_init_nivaead_ops
,
#ifdef
CONFIG_PROC_FS
.
show
=
crypto_nivaead_show
,
#endif
.
report
=
crypto_nivaead_report
,
};
EXPORT_SYMBOL_GPL
(
crypto_nivaead_type
);
static
int
crypto_grab_nivaead
(
struct
crypto_aead_spawn
*
spawn
,
const
char
*
name
,
u32
type
,
u32
mask
)
{
struct
crypto_alg
*
alg
;
int
err
;
type
&= ~(
CRYPTO_ALG_TYPE_MASK
|
CRYPTO_ALG_GENIV
);
type
|=
CRYPTO_ALG_TYPE_AEAD
;
mask
|=
CRYPTO_ALG_TYPE_MASK
|
CRYPTO_ALG_GENIV
;
alg
=
crypto_alg_mod_lookup
(
name
,
type
,
mask
);
if
(
IS_ERR
(
alg
))
return
PTR_ERR
(
alg
);
err
=
crypto_init_spawn
(
&
spawn
->
base
,
alg
,
spawn
->
base
.
inst
,
mask
);
crypto_mod_put
(
alg
);
return
err
;
}
struct
crypto_instance
*
aead_geniv_alloc
(
struct
crypto_template
*
tmpl
,
struct
rtattr
*
*
tb
,
u32
type
,
u32
mask
)
{
const
char
*
name
;
struct
crypto_aead_spawn
*
spawn
;
struct
crypto_attr_type
*
algt
;
struct
crypto_instance
*
inst
;
struct
crypto_alg
*
alg
;
int
err
;
algt
=
crypto_get_attr_type
(
tb
);
err
=
PTR_ERR
(
algt
);
if
(
IS_ERR
(
algt
))
return
ERR_PTR
(
err
);
if
((
algt
->
type
^ (
CRYPTO_ALG_TYPE_AEAD
|
CRYPTO_ALG_GENIV
))
&
algt
->
mask
)
return
ERR_PTR
(
-
EINVAL
);
name
=
crypto_attr_alg_name
(
tb
[
1
]);
err
=
PTR_ERR
(
name
);
if
(
IS_ERR
(
name
))
return
ERR_PTR
(
err
);
inst
=
kzalloc
(
sizeof
(
*
inst
)
+
sizeof
(
*
spawn
),
GFP_KERNEL
);
if
(!
inst
)
return
ERR_PTR
(
-
ENOMEM
);
spawn
=
crypto_instance_ctx
(
inst
);
/* Ignore async algorithms if necessary. */
mask
|=
crypto_requires_sync
(
algt
->
type
,
algt
->
mask
);
crypto_set_aead_spawn
(
spawn
,
inst
);
err
=
crypto_grab_nivaead
(
spawn
,
name
,
type
,
mask
);
if
(
err
)
goto
err_free_inst
;
alg
=
crypto_aead_spawn_alg
(
spawn
);
err
=
-
EINVAL
;
if
(!
alg
->
cra_aead
.
ivsize
)
goto
err_drop_alg
;
/*
* This is only true if we're constructing an algorithm with its
* default IV generator. For the default generator we elide the
* template name and double-check the IV generator.
*/
if
(
algt
->
mask
&
CRYPTO_ALG_GENIV
) {
if
(
strcmp
(
tmpl
->
name
,
alg
->
cra_aead
.
geniv
))
goto
err_drop_alg
;
memcpy
(
inst
->
alg
.
cra_name
,
alg
->
cra_name
,
CRYPTO_MAX_ALG_NAME
);
memcpy
(
inst
->
alg
.
cra_driver_name
,
alg
->
cra_driver_name
,
CRYPTO_MAX_ALG_NAME
);
}
else
{
err
=
-
ENAMETOOLONG
;
if
(
snprintf
(
inst
->
alg
.
cra_name
,
CRYPTO_MAX_ALG_NAME
,
"%s(%s)"
,
tmpl
->
name
,
alg
->
cra_name
) >=
CRYPTO_MAX_ALG_NAME
)
goto
err_drop_alg
;
if
(
snprintf
(
inst
->
alg
.
cra_driver_name
,
CRYPTO_MAX_ALG_NAME
,
"%s(%s)"
,
tmpl
->
name
,
alg
->
cra_driver_name
) >=
CRYPTO_MAX_ALG_NAME
)
goto
err_drop_alg
;
}
inst
->
alg
.
cra_flags
=
CRYPTO_ALG_TYPE_AEAD
|
CRYPTO_ALG_GENIV
;
inst
->
alg
.
cra_flags
|=
alg
->
cra_flags
&
CRYPTO_ALG_ASYNC
;
inst
->
alg
.
cra_priority
=
alg
->
cra_priority
;
inst
->
alg
.
cra_blocksize
=
alg
->
cra_blocksize
;
inst
->
alg
.
cra_alignmask
=
alg
->
cra_alignmask
;
inst
->
alg
.
cra_type
=
&
crypto_aead_type
;
inst
->
alg
.
cra_aead
.
ivsize
=
alg
->
cra_aead
.
ivsize
;
inst
->
alg
.
cra_aead
.
maxauthsize
=
alg
->
cra_aead
.
maxauthsize
;
inst
->
alg
.
cra_aead
.
geniv
=
alg
->
cra_aead
.
geniv
;
inst
->
alg
.
cra_aead
.
setkey
=
alg
->
cra_aead
.
setkey
;
inst
->
alg
.
cra_aead
.
setauthsize
=
alg
->
cra_aead
.
setauthsize
;
inst
->
alg
.
cra_aead
.
encrypt
=
alg
->
cra_aead
.
encrypt
;
inst
->
alg
.
cra_aead
.
decrypt
=
alg
->
cra_aead
.
decrypt
;
out
:
return
inst
;
err_drop_alg
:
crypto_drop_aead
(
spawn
);
err_free_inst
:
kfree
(
inst
);
inst
=
ERR_PTR
(
err
);
goto
out
;
}
EXPORT_SYMBOL_GPL
(
aead_geniv_alloc
);
void
aead_geniv_free
(
struct
crypto_instance
*
inst
)
{
crypto_drop_aead
(
crypto_instance_ctx
(
inst
));
kfree
(
inst
);
}
EXPORT_SYMBOL_GPL
(
aead_geniv_free
);
int
aead_geniv_init
(
struct
crypto_tfm
*
tfm
)
{
struct
crypto_instance
*
inst
=
(
void
*
)
tfm
->
__crt_alg
;
struct
crypto_aead
*
aead
;
aead
=
crypto_spawn_aead
(
crypto_instance_ctx
(
inst
));
if
(
IS_ERR
(
aead
))
return
PTR_ERR
(
aead
);
tfm
->
crt_aead
.
base
=
aead
;
tfm
->
crt_aead
.
reqsize
+=
crypto_aead_reqsize
(
aead
);
return
0
;
}
EXPORT_SYMBOL_GPL
(
aead_geniv_init
);
void
aead_geniv_exit
(
struct
crypto_tfm
*
tfm
)
{
crypto_free_aead
(
tfm
->
crt_aead
.
base
);
}
EXPORT_SYMBOL_GPL
(
aead_geniv_exit
);
static
int
crypto_nivaead_default
(
struct
crypto_alg
*
alg
,
u32
type
,
u32
mask
)
{
struct
rtattr
*
tb
[
3
];
struct
{
struct
rtattr
attr
;
struct
crypto_attr_type
data
;
}
ptype
;
struct
{
struct
rtattr
attr
;
struct
crypto_attr_alg
data
;
}
palg
;
struct
crypto_template
*
tmpl
;
struct
crypto_instance
*
inst
;
struct
crypto_alg
*
larval
;
const
char
*
geniv
;
int
err
;
larval
=
crypto_larval_lookup
(
alg
->
cra_driver_name
,
CRYPTO_ALG_TYPE_AEAD
|
CRYPTO_ALG_GENIV
,
CRYPTO_ALG_TYPE_MASK
|
CRYPTO_ALG_GENIV
);
err
=
PTR_ERR
(
larval
);
if
(
IS_ERR
(
larval
))
goto
out
;
err
=
-
EAGAIN
;
if
(!
crypto_is_larval
(
larval
))
goto
drop_larval
;
ptype
.
attr
.
rta_len
=
sizeof
(
ptype
);
ptype
.
attr
.
rta_type
=
CRYPTOA_TYPE
;
ptype
.
data
.
type
=
type
|
CRYPTO_ALG_GENIV
;
/* GENIV tells the template that we're making a default geniv. */
ptype
.
data
.
mask
=
mask
|
CRYPTO_ALG_GENIV
;
tb
[
0
]
=
&
ptype
.
attr
;
palg
.
attr
.
rta_len
=
sizeof
(
palg
);
palg
.
attr
.
rta_type
=
CRYPTOA_ALG
;
/* Must use the exact name to locate ourselves. */
memcpy
(
palg
.
data
.
name
,
alg
->
cra_driver_name
,
CRYPTO_MAX_ALG_NAME
);
tb
[
1
]
=
&
palg
.
attr
;
tb
[
2
]
=
NULL
;
geniv
=
alg
->
cra_aead
.
geniv
;
tmpl
=
crypto_lookup_template
(
geniv
);
err
=
-
ENOENT
;
if
(!
tmpl
)
goto
kill_larval
;
inst
=
tmpl
->
alloc
(
tb
);
err
=
PTR_ERR
(
inst
);
if
(
IS_ERR
(
inst
))
goto
put_tmpl
;
if
((
err
=
crypto_register_instance
(
tmpl
,
inst
))) {
tmpl
->
free
(
inst
);
goto
put_tmpl
;
}
/* Redo the lookup to use the instance we just registered. */
err
=
-
EAGAIN
;
put_tmpl
:
crypto_tmpl_put
(
tmpl
);
kill_larval
:
crypto_larval_kill
(
larval
);
drop_larval
:
crypto_mod_put
(
larval
);
out
:
crypto_mod_put
(
alg
);
return
err
;
}
struct
crypto_alg
*
crypto_lookup_aead
(
const
char
*
name
,
u32
type
,
u32
mask
)
{
struct
crypto_alg
*
alg
;
alg
=
crypto_alg_mod_lookup
(
name
,
type
,
mask
);
if
(
IS_ERR
(
alg
))
return
alg
;
if
(
alg
->
cra_type
==
&
crypto_aead_type
)
return
alg
;
if
(!
alg
->
cra_aead
.
ivsize
)
return
alg
;
crypto_mod_put
(
alg
);
alg
=
crypto_alg_mod_lookup
(
name
,
type
|
CRYPTO_ALG_TESTED
,
mask
&
~
CRYPTO_ALG_TESTED
);
if
(
IS_ERR
(
alg
))
return
alg
;
if
(
alg
->
cra_type
==
&
crypto_aead_type
) {
if
((
alg
->
cra_flags
^
type
^ ~
mask
)
&
CRYPTO_ALG_TESTED
) {
crypto_mod_put
(
alg
);
alg
=
ERR_PTR
(
-
ENOENT
);
}
return
alg
;
}
BUG_ON
(!
alg
->
cra_aead
.
ivsize
);
return
ERR_PTR
(
crypto_nivaead_default
(
alg
,
type
,
mask
));
}
EXPORT_SYMBOL_GPL
(
crypto_lookup_aead
);
int
crypto_grab_aead
(
struct
crypto_aead_spawn
*
spawn
,
const
char
*
name
,
u32
type
,
u32
mask
)
{
struct
crypto_alg
*
alg
;
int
err
;
type
&= ~(
CRYPTO_ALG_TYPE_MASK
|
CRYPTO_ALG_GENIV
);
type
|=
CRYPTO_ALG_TYPE_AEAD
;
mask
&= ~(
CRYPTO_ALG_TYPE_MASK
|
CRYPTO_ALG_GENIV
);
mask
|=
CRYPTO_ALG_TYPE_MASK
;
alg
=
crypto_lookup_aead
(
name
,
type
,
mask
);
if
(
IS_ERR
(
alg
))
return
PTR_ERR
(
alg
);
err
=
crypto_init_spawn
(
&
spawn
->
base
,
alg
,
spawn
->
base
.
inst
,
mask
);
crypto_mod_put
(
alg
);
return
err
;
}
EXPORT_SYMBOL_GPL
(
crypto_grab_aead
);
struct
crypto_aead
*
crypto_alloc_aead
(
const
char
*
alg_name
,
u32
type
,
u32
mask
)
{
struct
crypto_tfm
*
tfm
;
int
err
;
type
&= ~(
CRYPTO_ALG_TYPE_MASK
|
CRYPTO_ALG_GENIV
);
type
|=
CRYPTO_ALG_TYPE_AEAD
;
mask
&= ~(
CRYPTO_ALG_TYPE_MASK
|
CRYPTO_ALG_GENIV
);
mask
|=
CRYPTO_ALG_TYPE_MASK
;
for
(;;) {
struct
crypto_alg
*
alg
;
alg
=
crypto_lookup_aead
(
alg_name
,
type
,
mask
);
if
(
IS_ERR
(
alg
)) {
err
=
PTR_ERR
(
alg
);
goto
err
;
}
tfm
=
__crypto_alloc_tfm
(
alg
,
type
,
mask
);
if
(!
IS_ERR
(
tfm
))
return
__crypto_aead_cast
(
tfm
);
crypto_mod_put
(
alg
);
err
=
PTR_ERR
(
tfm
);
err
:
if
(
err
!=
-
EAGAIN
)
break
;
if
(
signal_pending
(
current
)) {
err
=
-
EINTR
;
break
;
}
}
return
ERR_PTR
(
err
);
}
EXPORT_SYMBOL_GPL
(
crypto_alloc_aead
);
MODULE_LICENSE
(
"GPL"
);
MODULE_DESCRIPTION
(
"Authenticated Encryption with Associated Data (AEAD)"
);
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