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5e5d3be3
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dragonwell8_jdk
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5e5d3be3
编写于
7月 12, 2020
作者:
W
weijun
浏览文件
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浏览文件
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电子邮件补丁
差异文件
8238804: Enhance key handling process
Reviewed-by: rriggs, mullan, ahgross, rhalade, mbalao, andrew
上级
f3e2235f
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
19 addition
and
5 deletion
+19
-5
src/share/classes/java/security/MessageDigest.java
src/share/classes/java/security/MessageDigest.java
+19
-5
未找到文件。
src/share/classes/java/security/MessageDigest.java
浏览文件 @
5e5d3be3
/*
/*
* Copyright (c) 1996, 20
17
, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1996, 20
20
, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
*
* This code is free software; you can redistribute it and/or modify it
* This code is free software; you can redistribute it and/or modify it
...
@@ -433,6 +433,12 @@ public abstract class MessageDigest extends MessageDigestSpi {
...
@@ -433,6 +433,12 @@ public abstract class MessageDigest extends MessageDigestSpi {
/**
/**
* Compares two digests for equality. Does a simple byte compare.
* Compares two digests for equality. Does a simple byte compare.
*
*
* @implNote
* All bytes in {@code digesta} are examined to determine equality.
* The calculation time depends only on the length of {@code digesta}.
* It does not depend on the length of {@code digestb} or the contents
* of {@code digesta} and {@code digestb}.
*
* @param digesta one of the digests to compare.
* @param digesta one of the digests to compare.
*
*
* @param digestb the other digest to compare.
* @param digestb the other digest to compare.
...
@@ -444,14 +450,22 @@ public abstract class MessageDigest extends MessageDigestSpi {
...
@@ -444,14 +450,22 @@ public abstract class MessageDigest extends MessageDigestSpi {
if
(
digesta
==
null
||
digestb
==
null
)
{
if
(
digesta
==
null
||
digestb
==
null
)
{
return
false
;
return
false
;
}
}
if
(
digesta
.
length
!=
digestb
.
length
)
{
return
false
;
int
lenA
=
digesta
.
length
;
int
lenB
=
digestb
.
length
;
if
(
lenB
==
0
)
{
return
lenA
==
0
;
}
}
int
result
=
0
;
int
result
=
0
;
result
|=
lenA
-
lenB
;
// time-constant comparison
// time-constant comparison
for
(
int
i
=
0
;
i
<
digesta
.
length
;
i
++)
{
for
(
int
i
=
0
;
i
<
lenA
;
i
++)
{
result
|=
digesta
[
i
]
^
digestb
[
i
];
// If i >= lenB, indexB is 0; otherwise, i.
int
indexB
=
((
i
-
lenB
)
>>>
31
)
*
i
;
result
|=
digesta
[
i
]
^
digestb
[
indexB
];
}
}
return
result
==
0
;
return
result
==
0
;
}
}
...
...
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