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01be5db6
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01be5db6
编写于
2月 10, 2011
作者:
A
Andy Polyakov
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电子邮件补丁
差异文件
xts128.c: initial draft.
上级
a4113c52
变更
1
隐藏空白更改
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并排
Showing
1 changed file
with
189 addition
and
0 deletion
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crypto/modes/xts128.c
crypto/modes/xts128.c
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未找到文件。
crypto/modes/xts128.c
0 → 100644
浏览文件 @
01be5db6
/* ====================================================================
* Copyright (c) 2011 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#include <openssl/crypto.h>
#include "modes_lcl.h"
#include <string.h>
#ifndef MODES_DEBUG
# ifndef NDEBUG
# define NDEBUG
# endif
#endif
#include <assert.h>
typedef
struct
{
void
*
key1
,
*
key2
;
block128_f
block1
,
block2
;
}
XTS128_CONTEXT
;
int
CRYPTO_xts128_encrypt
(
const
XTS128_CONTEXT
*
ctx
,
u64
secno
,
const
unsigned
char
*
inp
,
unsigned
char
*
out
,
size_t
len
,
int
enc
)
{
const
union
{
long
one
;
char
little
;
}
is_endian
=
{
1
};
union
{
u64
u
[
2
];
u32
d
[
4
];
u8
c
[
16
];
}
tweak
,
scratch
;
if
(
len
<
16
)
return
-
1
;
if
(
is_endian
.
little
)
{
tweak
.
u
[
0
]
=
secno
;
tweak
.
u
[
1
]
=
0
;
}
else
{
PUTU32
(
tweak
.
c
,
secno
);
PUTU32
(
tweak
.
c
+
4
,
secno
>>
32
);
tweak
.
u
[
1
]
=
0
;
}
(
*
ctx
->
block2
)(
tweak
.
c
,
tweak
.
c
,
ctx
->
key2
);
if
(
!
enc
&&
len
%
16
)
len
-=
16
;
while
(
len
>=
16
)
{
#if defined(STRICT_ALIGNMENT)
memcpy
(
scratch
.
c
,
inp
,
16
);
scratch
.
u
[
0
]
^=
tweak
.
u
[
0
];
scratch
.
u
[
1
]
^=
tweak
.
u
[
1
];
#else
scratch
.
u
[
0
]
=
((
u64
*
)
inp
)[
0
]
^
tweak
.
u
[
0
];
scratch
.
u
[
1
]
=
((
u64
*
)
inp
)[
1
]
^
tweak
.
u
[
1
];
#endif
(
*
ctx
->
block1
)(
scratch
.
c
,
scratch
.
c
,
ctx
->
key1
);
scratch
.
u
[
0
]
^=
tweak
.
u
[
0
];
scratch
.
u
[
1
]
^=
tweak
.
u
[
1
];
memcpy
(
out
,
scratch
.
c
,
16
);
inp
+=
16
;
out
+=
16
;
len
-=
16
;
if
(
is_endian
.
little
)
{
unsigned
int
carry
,
res
;
res
=
0x87
&
(((
int
)
tweak
.
d
[
3
])
>>
31
);
carry
=
tweak
.
u
[
0
]
>>
63
;
tweak
.
u
[
0
]
=
(
tweak
.
u
[
0
]
<<
1
)
^
res
;
tweak
.
u
[
1
]
=
(
tweak
.
u
[
1
]
<<
1
)
|
carry
;
}
else
{
unsigned
int
carry
,
c
,
i
;
for
(
carry
=
0
,
i
=
0
;
i
<
16
;
++
i
)
{
c
=
tweak
.
c
[
i
];
tweak
.
c
[
i
]
=
(
c
<<
1
)
|
carry
;
carry
=
c
>>
7
;
}
tweak
.
c
[
0
]
^=
0x87
&
(
0
-
carry
);
}
}
if
(
len
)
{
unsigned
int
i
;
if
(
enc
)
{
for
(
i
=
0
;
i
<
len
;
++
i
)
{
u8
c
=
inp
[
i
];
out
[
i
]
=
scratch
.
c
[
i
];
scratch
.
c
[
i
]
=
c
;
}
scratch
.
u
[
0
]
^=
tweak
.
u
[
0
];
scratch
.
u
[
1
]
^=
tweak
.
u
[
1
];
(
*
ctx
->
block1
)(
scratch
.
c
,
scratch
.
c
,
ctx
->
key1
);
scratch
.
u
[
0
]
^=
tweak
.
u
[
0
];
scratch
.
u
[
1
]
^=
tweak
.
u
[
1
];
memcpy
(
out
-
16
,
scratch
.
c
,
16
);
}
else
{
union
{
u64
u
[
2
];
u8
c
[
16
];
}
tweak1
;
if
(
is_endian
.
little
)
{
unsigned
int
carry
,
res
;
res
=
0x87
&
(((
int
)
tweak
.
d
[
3
])
>>
31
);
carry
=
tweak
.
u
[
0
]
>>
63
;
tweak1
.
u
[
0
]
=
(
tweak
.
u
[
0
]
<<
1
)
^
res
;
tweak1
.
u
[
1
]
=
(
tweak
.
u
[
1
]
<<
1
)
|
carry
;
}
else
{
unsigned
int
carry
,
c
;
for
(
carry
=
0
,
i
=
0
;
i
<
16
;
++
i
)
{
c
=
tweak
.
c
[
i
];
tweak1
.
c
[
i
]
=
(
c
<<
1
)
|
carry
;
carry
=
c
>>
7
;
}
tweak1
.
c
[
0
]
^=
0x87
&
(
0
-
carry
);
}
#if defined(STRICT_ALIGNMENT)
memcpy
(
scratch
.
c
,
inp
,
16
);
scratch
.
u
[
0
]
^=
tweak1
.
u
[
0
];
scratch
.
u
[
1
]
^=
tweak1
.
u
[
1
];
#else
scratch
.
u
[
0
]
=
((
u64
*
)
inp
)[
0
]
^
tweak1
.
u
[
0
];
scratch
.
u
[
1
]
=
((
u64
*
)
inp
)[
1
]
^
tweak1
.
u
[
1
];
#endif
(
*
ctx
->
block1
)(
scratch
.
c
,
scratch
.
c
,
ctx
->
key1
);
scratch
.
u
[
0
]
^=
tweak1
.
u
[
0
];
scratch
.
u
[
1
]
^=
tweak1
.
u
[
1
];
for
(
i
=
0
;
i
<
len
;
++
i
)
{
u8
c
=
inp
[
16
+
i
];
out
[
16
+
i
]
=
scratch
.
c
[
i
];
scratch
.
c
[
i
]
=
c
;
}
scratch
.
u
[
0
]
^=
tweak
.
u
[
0
];
scratch
.
u
[
1
]
^=
tweak
.
u
[
1
];
(
*
ctx
->
block1
)(
scratch
.
c
,
scratch
.
c
,
ctx
->
key1
);
scratch
.
u
[
0
]
^=
tweak
.
u
[
0
];
scratch
.
u
[
1
]
^=
tweak
.
u
[
1
];
memcpy
(
out
,
scratch
.
c
,
16
);
}
}
return
0
;
}
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