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16cb0d95
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16cb0d95
编写于
3月 04, 2011
作者:
A
Andy Polyakov
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
xts128.c: minor optimization.
上级
0ab8fd58
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
55 addition
and
56 deletion
+55
-56
crypto/modes/xts128.c
crypto/modes/xts128.c
+55
-56
未找到文件。
crypto/modes/xts128.c
浏览文件 @
16cb0d95
...
...
@@ -69,6 +69,7 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, u64 secno,
{
const
union
{
long
one
;
char
little
;
}
is_endian
=
{
1
};
union
{
u64
u
[
2
];
u32
d
[
4
];
u8
c
[
16
];
}
tweak
,
scratch
;
unsigned
int
i
;
if
(
len
<
16
)
return
-
1
;
...
...
@@ -84,7 +85,7 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, u64 secno,
(
*
ctx
->
block2
)(
tweak
.
c
,
tweak
.
c
,
ctx
->
key2
);
if
(
!
enc
&&
len
%
16
)
len
-=
16
;
if
(
!
enc
&&
(
len
%
16
)
)
len
-=
16
;
while
(
len
>=
16
)
{
#if defined(STRICT_ALIGNMENT)
...
...
@@ -103,6 +104,8 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, u64 secno,
out
+=
16
;
len
-=
16
;
if
(
len
==
0
)
return
0
;
if
(
is_endian
.
little
)
{
unsigned
int
carry
,
res
;
...
...
@@ -112,7 +115,7 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, u64 secno,
tweak
.
u
[
1
]
=
(
tweak
.
u
[
1
]
<<
1
)
|
carry
;
}
else
{
unsigned
int
carry
,
c
,
i
;
unsigned
int
carry
,
c
;
for
(
carry
=
0
,
i
=
0
;
i
<
16
;
++
i
)
{
c
=
tweak
.
c
[
i
];
...
...
@@ -122,67 +125,63 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, u64 secno,
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
);
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
{
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
);
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
];
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
];
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
);
(
*
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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