java - The cipher 'aes256-cbc' is required, but it is not available

Question

I am trying to do an SFTP using JSch, but I encountered some error:

com.jcraft.jsch.JSchException: The cipher 'aes256-cbc' is required, but it is not available.

Below is the code I used. Is there anything I missed out?

JSch jsch = new JSch();
Session session = null;

jsch.addIdentity("C:\privatekey.ppk", "Password");

session = jsch.getSession("user", "54.251.240.234", 22);
session.setConfig("StrictHostKeyChecking", "no");


Channel channel = session.openChannel("sftp");
channel.connect();
ChannelSftp sftpChannel = (ChannelSftp) channel;
sftpChannel.put("C:\Users\test.txt", "/home/user/test.txt");
sftpChannel.exit();
session.disconnect();

Stacktrace

[8/30/13 1:56:26:556 SGT] 00000021 SystemErr     R com.jcraft.jsch.JSchException: The cipher 'aes256-cbc' is required, but it is not available.
[8/30/13 1:56:26:557 SGT] 00000021 SystemErr     R  at com.jcraft.jsch.KeyPair.loadPPK(KeyPair.java:1017)
[8/30/13 1:56:26:557 SGT] 00000021 SystemErr     R  at com.jcraft.jsch.KeyPair.load(KeyPair.java:590)
[8/30/13 1:56:26:557 SGT] 00000021 SystemErr     R  at com.jcraft.jsch.KeyPair.load(KeyPair.java:542)
[8/30/13 1:56:26:557 SGT] 00000021 SystemErr     R  at com.jcraft.jsch.IdentityFile.newInstance(IdentityFile.java:40)
[8/30/13 1:56:26:558 SGT] 00000021 SystemErr     R  at com.jcraft.jsch.JSch.addIdentity(JSch.java:389)
[8/30/13 1:56:26:558 SGT] 00000021 SystemErr     R  at com.jcraft.jsch.JSch.addIdentity(JSch.java:370)
[8/30/13 1:56:26:558 SGT] 00000021 SystemErr     R  at com.belsize.sb.SB_UtilityBean.runExternalProgram_Windows(SB_UtilityBean.java:1134)
[8/30/13 1:56:26:558 SGT] 00000021 SystemErr     R  at com.belsize.sb.EJSLocal0SLSB_Utility_861cc9f0.runExternalProgram_Windows(EJSLocal0SLSB_Utility_861cc9f0.java)
[8/30/13 1:56:26:558 SGT] 00000021 SystemErr     R  at com.belsize.sb.SB_IntegrationBean.getFTP_Status(SB_IntegrationBean.java:2175)
[8/30/13 1:56:26:559 SGT] 00000021 SystemErr     R  at com.belsize.sb.EJSLocal0SLSB_Integration_13682180.getFTP_Status(EJSLocal0SLSB_Integration_13682180.java)
[8/30/13 1:56:26:559 SGT] 00000021 SystemErr     R  at pagecode.module.user_permission.W_useraccount.getFTP_Status(W_useraccount.java:992)
[8/30/13 1:56:26:559 SGT] 00000021 SystemErr     R  at pagecode.module.user_permission.Up1006.doUp1006_commandlink_testftpAction(Up1006.java:711)
[8/30/13 1:56:26:559 SGT] 00000021 SystemErr     R  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[8/30/13 1:56:26:560 SGT] 00000021 SystemErr     R  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
[8/30/13 1:56:26:560 SGT] 00000021 SystemErr     R  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
[8/30/13 1:56:26:560 SGT] 00000021 SystemErr     R  at java.lang.reflect.Method.invoke(Method.java:611)
[8/30/13 1:56:26:560 SGT] 00000021 SystemErr     R  at org.apache.el.parser.AstValue.invoke(AstValue.java:268)
[8/30/13 1:56:26:560 SGT] 00000021 SystemErr     R  at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)
[8/30/13 1:56:26:561 SGT] 00000021 SystemErr     R  at org.apache.myfaces.view.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:83)
[8/30/13 1:56:26:561 SGT] 00000021 SystemErr     R  at javax.faces.component._MethodExpressionToMethodBinding.invoke(_MethodExpressionToMethodBinding.java:88)
[8/30/13 1:56:26:561 SGT] 00000021 SystemErr     R  at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:100)
[8/30/13 1:56:26:561 SGT] 00000021 SystemErr     R  at javax.faces.component.UICommand.broadcast(UICommand.java:120)
[8/30/13 1:56:26:561 SGT] 00000021 SystemErr     R  at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:973)
[8/30/13 1:56:26:562 SGT] 00000021 SystemErr     R  at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:275)
[8/30/13 1:56:26:562 SGT] 00000021 SystemErr     R  at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1285)
[8/30/13 1:56:26:562 SGT] 00000021 SystemErr     R  at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:711)
[8/30/13 1:56:26:562 SGT] 00000021 SystemErr     R  at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:34)
[8/30/13 1:56:26:562 SGT] 00000021 SystemErr     R  at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171)
[8/30/13 1:56:26:563 SGT] 00000021 SystemErr     R  at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
[8/30/13 1:56:26:563 SGT] 00000021 SystemErr     R  at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189)
[8/30/13 1:56:26:563 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1225)
[8/30/13 1:56:26:563 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:775)
[8/30/13 1:56:26:564 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:457)
[8/30/13 1:56:26:564 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
[8/30/13 1:56:26:564 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.filter.WebAppFilterChain.invokeTarget(WebAppFilterChain.java:136)
[8/30/13 1:56:26:564 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:97)
[8/30/13 1:56:26:564 SGT] 00000021 SystemErr     R  at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:77)
[8/30/13 1:56:26:564 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:195)
[8/30/13 1:56:26:565 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:91)
[8/30/13 1:56:26:565 SGT] 00000021 SystemErr     R  at com.belsize.servlet.filter.RedirectLogin.doFilter(RedirectLogin.java:177)
[8/30/13 1:56:26:565 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:195)
[8/30/13 1:56:26:565 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:91)
[8/30/13 1:56:26:565 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:928)
[8/30/13 1:56:26:565 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1025)
[8/30/13 1:56:26:566 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)
[8/30/13 1:56:26:566 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:908)
[8/30/13 1:56:26:566 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1662)
[8/30/13 1:56:26:566 SGT] 00000021 SystemErr     R  at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:195)
[8/30/13 1:56:26:566 SGT] 00000021 SystemErr     R  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:453)
[8/30/13 1:56:26:566 SGT] 00000021 SystemErr     R  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:515)
[8/30/13 1:56:26:567 SGT] 00000021 SystemErr     R  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:306)
[8/30/13 1:56:26:567 SGT] 00000021 SystemErr     R  at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:83)
[8/30/13 1:56:26:567 SGT] 00000021 SystemErr     R  at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:166)
[8/30/13 1:56:26:567 SGT] 00000021 SystemErr     R  at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
[8/30/13 1:56:26:567 SGT] 00000021 SystemErr     R  at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
[8/30/13 1:56:26:568 SGT] 00000021 SystemErr     R  at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
[8/30/13 1:56:26:568 SGT] 00000021 SystemErr     R  at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
[8/30/13 1:56:26:568 SGT] 00000021 SystemErr     R  at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
[8/30/13 1:56:26:568 SGT] 00000021 SystemErr     R  at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
[8/30/13 1:56:26:568 SGT] 00000021 SystemErr     R  at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1691)

Answer 1

This error also appear when your private key is in putty format and not in open ssh format.

You can convert the key with the tool puttygen to an open ssh format private key.

This solves the Problem for me. Replaceing the Java files was not necessary in my case with netbeans 8.0.2 and Java 8_25.