Hi,
Am 10.02.2016 um 09:38 schrieb Vladimir Kvashin:
> - does jsch accept contributions? if yes, I can try fixing this
> and propose a patch
I asked this question as well in the past and have never
received an answer.
> - are there any plans to fix it?
FWIW, here is a patch, that should fix the issue. The
Digester instance in KnownHost is used in a global way
and needed quite some synchronization. I changed it to
a new instance every time the digester is retrieved,
making the synchronization as a whole unnecessary.
Cheers, Lothar
--------------- snip
### Eclipse Workspace Patch 1.0
#P JSCH_EBD
Index: src/main/java/com/jcraft/jsch/KnownHosts.java
===================================================================
--- src/main/java/com/jcraft/jsch/KnownHosts.java (revision 24760)
+++ src/main/java/com/jcraft/jsch/KnownHosts.java (working copy)
@@ -39,7 +39,7 @@
private String known_hosts=null;
private java.util.Vector pool=null;
- private MAC hmacsha1=null;
+ private Class hmacsha1_class = null;
KnownHosts(JSch jsch){
super();
@@ -482,17 +482,18 @@
return hosts;
}
- private synchronized MAC getHMACSHA1(){
- if(hmacsha1==null){
+ private MAC getHMACSHA1(){
try{
- Class c=Class.forName(jsch.getConfig("hmac-sha1"));
- hmacsha1=(MAC)(c.newInstance());
+ if (hmacsha1_class == null){
+ String hmacsha1_classname = JSch.getConfig("hmac-sha1");
+ hmacsha1_class = Class.forName(hmacsha1_classname);
+ }
+ return (MAC) hmacsha1_class.newInstance();
}
catch(Exception e){
System.err.println("hmacsha1: "+e);
}
- }
- return hmacsha1;
+ return null;
}
HostKey createHashedHostKey(String host, byte[]key) throws JSchException {
@@ -539,14 +540,12 @@
}
MAC macsha1=getHMACSHA1();
try{
- synchronized(macsha1){
macsha1.init(salt);
byte[] foo=Util.str2byte(_host);
macsha1.update(foo, 0, foo.length);
byte[] bar=new byte[macsha1.getBlockSize()];
macsha1.doFinal(bar, 0);
return Util.array_equals(hash, bar);
- }
}
catch(Exception e){
System.out.println(e);
@@ -570,13 +569,11 @@
}
}
try{
- synchronized(macsha1){
macsha1.init(salt);
byte[] foo=Util.str2byte(host);
macsha1.update(foo, 0, foo.length);
hash=new byte[macsha1.getBlockSize()];
macsha1.doFinal(hash, 0);
- }
}
catch(Exception e){
}
--------------- snip
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