SFTP Problem with ServU Server

Question

Hi,

I have to create an SFTP client for an SFTP server running on Serv-U (which I saw in the list of supported servers). I created the Private Key using the Serv U Management console. Now, whenver I try to connect to it, I get an exception:
com.enterprisedt.net.j2ssh.transport.publickey.InvalidSshKeyException: Can't read key due to cryptography problems
at com.enterprisedt.net.j2ssh.openssh.OpenSSHPrivateKeyFormat.decryptKeyblob(Unknown Source)
at com.enterprisedt.net.j2ssh.transport.publickey.SshPrivateKeyFile.toPrivateKey(Unknown Source)
at com.enterprisedt.net.ftp.ssh.SSHFTPClient.setAuthentication(Unknown Source)
at com.enterprisedt.net.ftp.ssh.SSHFTPClient.setAuthentication(Unknown Source)
at com.equens.nl.cordys.ac.sftp.client.SFTPClient.getConnection(SFTPClient.java:118)
at com.equens.nl.cordys.ac.sftp.client.SFTPClient.getDirectoryListing(SFTPClient.java:160)
at com.equens.nl.cordys.ac.sftp.client.SFTPClient.main(SFTPClient.java:211)
Caused by: java.security.NoSuchAlgorithmException: Unsupported passphrase algorithm: DES-EDE3-CFB
at com.enterprisedt.net.j2ssh.openssh.PEMReader.decryptPayload(Unknown Source)
... 7 more

Here is the log:
DEBUG [CryptixProperties] 7 aug 2008 16:36:10.690 : Successfully loaded the CryptixEDT properties file
INFO [puretls] 7 aug 2008 16:36:10.768 : PureTLS debug level=0
DEBUG [com.enterprisedt.net.j2ssh.transport.cipher.SshCipherFactory] 7 aug 2008 16:36:10.799 : Loading supported cipher algorithms
DEBUG [SshKeyExchangeFactory] 7 aug 2008 16:36:10.799 : Loading key exchange methods
DEBUG [SshKeyExchangeFactory] 7 aug 2008 16:36:10.815 : The default key exchange is not set! using first in list
DEBUG [com.enterprisedt.net.j2ssh.transport.publickey.SshKeyPairFactory] 7 aug 2008 16:36:10.815 : Loading public key algorithms
DEBUG [ConfigurationLoader] 7 aug 2008 16:36:10.924 : Security provider 0: SUN
DEBUG [ConfigurationLoader] 7 aug 2008 16:36:10.924 : Security provider 1: SunRsaSign
DEBUG [ConfigurationLoader] 7 aug 2008 16:36:10.924 : Security provider 2: SunJSSE
DEBUG [ConfigurationLoader] 7 aug 2008 16:36:10.924 : Security provider 3: SunJCE
DEBUG [ConfigurationLoader] 7 aug 2008 16:36:10.924 : Security provider 4: SunJGSS
DEBUG [ConfigurationLoader] 7 aug 2008 16:36:10.924 : Security provider 5: SunSASL
DEBUG [ConfigurationLoader] 7 aug 2008 16:36:10.924 : Security provider 6: CryptixEDT
DEBUG [com.enterprisedt.net.j2ssh.transport.publickey.SshKeyPairFactory] 7 aug 2008 16:36:10.924 : The default public key is not set! using first in list
DEBUG [SshCompressionFactory] 7 aug 2008 16:36:10.924 : Loading compression methods
DEBUG [SshCompressionFactory] 7 aug 2008 16:36:10.924 : Installed none compression
DEBUG [SshCompressionFactory] 7 aug 2008 16:36:10.924 : Installed zlib compression
DEBUG [SshHmacFactory] 7 aug 2008 16:36:10.940 : Loading message authentication methods
INFO [LicenseProperties] 7 aug 2008 16:36:10.971 : Licence expiry date: 31 dec 9999
INFO [LicenseProperties] 7 aug 2008 16:36:10.971 : Production licence
DEBUG [SSHFTPClient] 7 aug 2008 16:36:10.971 : Class: com.enterprisedt.net.ftp.ssh.SSHFTPClient
Version: 1.5.2
Build timestamp: 31-May-2007 10:07:52 EST
Java version: 1.5.0_06
CLASSPATH: C:\Europa\workspace\SFTPConnector\classes;C:\Europa\workspace\SFTPConnector\platform\int\wcp.jar;C:\Europa\workspace\SFTPConnector\platform\int\ldap.jar;C:\Europa\workspace\SFTPConnector\sdk\lib\coelib.jar;C:\Europa\workspace\SFTPConnector\lib\edtftpj-pro.jar;C:\Europa\workspace\SFTPConnector\lib\license.jar
OS name: Windows XP
OS arch: x86
OS version: 5.1

DEBUG [SSHFTPClient] 7 aug 2008 16:36:10.971 : Created SFTP client.
DEBUG [com.enterprisedt.net.j2ssh.transport.publickey.SshPrivateKeyFile] 7 aug 2008 16:36:10.971 : Parsing private key file
DEBUG [com.enterprisedt.net.j2ssh.transport.publickey.SshPrivateKeyFormatFactory] 7 aug 2008 16:36:10.986 : Loading private key formats
DEBUG [com.enterprisedt.net.j2ssh.transport.publickey.SshPrivateKeyFormatFactory] 7 aug 2008 16:36:10.986 : Installing OpenSSH-PrivateKey private key format
DEBUG [com.enterprisedt.net.j2ssh.transport.publickey.SshPrivateKeyFormatFactory] 7 aug 2008 16:36:10.986 : Installing SSH.COM-PrivateKey-Base64Encoded private key format
DEBUG [com.enterprisedt.net.j2ssh.transport.publickey.SshPrivateKeyFormatFactory] 7 aug 2008 16:36:11.2 : Installing SSHTools-PrivateKey-Base64Encoded private key format
INFO [OpenSSHPrivateKeyFormat] 7 aug 2008 16:36:11.2 : Unpacking OpenSSH formatted private key

Please advice on what may be wrong, this is my first venture in building an SFTP client.
Thanks in advance.

Regards,
Sabyasachi.

Answer 1

The private key is using a rarely used algorithm, DES-EDE3-CFB, which we currently don't support.

When you generate the private key, are there any options for the algorithm used? If there are, choose a different one.

Answer 2

Hi Bruce,

Thank you for your resposne.
Unfortunately there isn't any way to choose the algorithm ,it seems that this is the default algorithm . Is there any other way to solve this problem.
Please advice.

Regards,
Sabyasachi.

Answer 3

If you can email your private key to support at enterprisedt dot com we should be able to get it working for you. There's no security risk in doing so, just regenerate a new key pair.

Answer 4

Note to readers - DES-EDE3-CFB is now supported for OpenSSH private keys from 2.0.2 which will be released soon.