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131e064e
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体验新版 GitCode,发现更多精彩内容 >>
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131e064e
编写于
12月 26, 2004
作者:
A
Andy Polyakov
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
Eliminate redundant memcpy of IV material. Performance improvement varies
from platform to platform and can be as large as 20%.
上级
556b8f3f
变更
1
显示空白变更内容
内联
并排
Showing
1 changed file
with
25 addition
and
7 deletion
+25
-7
crypto/aes/aes_cbc.c
crypto/aes/aes_cbc.c
+25
-7
未找到文件。
crypto/aes/aes_cbc.c
浏览文件 @
131e064e
...
...
@@ -65,7 +65,7 @@ void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
unsigned
long
n
;
unsigned
long
len
=
length
;
unsigned
char
tmp
[
AES_BLOCK_SIZE
];
unsigned
char
tmp
[
AES_BLOCK_SIZE
]
,
*
iv
=
ivec
;
assert
(
in
&&
out
&&
key
&&
ivec
);
assert
((
AES_ENCRYPT
==
enc
)
||
(
AES_DECRYPT
==
enc
));
...
...
@@ -73,22 +73,40 @@ void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
if
(
AES_ENCRYPT
==
enc
)
{
while
(
len
>=
AES_BLOCK_SIZE
)
{
for
(
n
=
0
;
n
<
AES_BLOCK_SIZE
;
++
n
)
tmp
[
n
]
=
in
[
n
]
^
ivec
[
n
];
AES_encrypt
(
tmp
,
out
,
key
);
memcpy
(
ivec
,
out
,
AES_BLOCK_SIZE
)
;
out
[
n
]
=
in
[
n
]
^
iv
[
n
];
AES_encrypt
(
out
,
out
,
key
);
iv
=
out
;
len
-=
AES_BLOCK_SIZE
;
in
+=
AES_BLOCK_SIZE
;
out
+=
AES_BLOCK_SIZE
;
}
if
(
len
)
{
for
(
n
=
0
;
n
<
len
;
++
n
)
tmp
[
n
]
=
in
[
n
]
^
iv
ec
[
n
];
tmp
[
n
]
=
in
[
n
]
^
iv
[
n
];
for
(
n
=
len
;
n
<
AES_BLOCK_SIZE
;
++
n
)
tmp
[
n
]
=
iv
ec
[
n
];
tmp
[
n
]
=
iv
[
n
];
AES_encrypt
(
tmp
,
tmp
,
key
);
memcpy
(
out
,
tmp
,
AES_BLOCK_SIZE
);
memcpy
(
ivec
,
tmp
,
AES_BLOCK_SIZE
);
iv
=
out
;
}
memcpy
(
ivec
,
iv
,
AES_BLOCK_SIZE
);
}
else
if
(
in
!=
out
)
{
while
(
len
>=
AES_BLOCK_SIZE
)
{
AES_decrypt
(
in
,
out
,
key
);
for
(
n
=
0
;
n
<
AES_BLOCK_SIZE
;
++
n
)
out
[
n
]
^=
iv
[
n
];
iv
=
in
;
len
-=
AES_BLOCK_SIZE
;
in
+=
AES_BLOCK_SIZE
;
out
+=
AES_BLOCK_SIZE
;
}
if
(
len
)
{
AES_decrypt
(
in
,
tmp
,
key
);
for
(
n
=
0
;
n
<
len
;
++
n
)
out
[
n
]
=
tmp
[
n
]
^
iv
[
n
];
iv
=
in
;
}
memcpy
(
ivec
,
iv
,
AES_BLOCK_SIZE
);
}
else
{
while
(
len
>=
AES_BLOCK_SIZE
)
{
memcpy
(
tmp
,
in
,
AES_BLOCK_SIZE
);
...
...
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