(C#) SFTP Authentication using an SSH Certificate

See more SFTP Examples

Note: This example requires Chilkat v11.0.0 or greater.

For more information, see https://www.chilkatsoft.com/understanding_ssh_certificates.asp

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.StringBuilder sbSshCert = new Chilkat.StringBuilder();
bool success = sbSshCert.LoadFile("qa_data/sshCert/user_ecdsa_key-cert.pub","utf-8");
if (success == false) {
    Debug.WriteLine("Failed to load user_ecdsa_key-cert.pub");
    return;
}

Chilkat.StringBuilder sbPrivKey = new Chilkat.StringBuilder();
success = sbPrivKey.LoadFile("qa_data/sshKeys/user_ecdsa_key","utf-8");
if (success == false) {
    Debug.WriteLine("Failed to load user_ecdsa_key");
    return;
}

Chilkat.SshKey key = new Chilkat.SshKey();
// Provide the password if the user_ecdsa_key is stored in an encrypted format.
key.Password = "secret";
success = key.FromOpenSshPrivateKey(sbPrivKey.GetAsString());
if (success == false) {
    Debug.WriteLine(key.LastErrorText);
    return;
}

// Indicate that the SSH certificate is to be used for authentication.
// The UseSshCertificate method was added in Chilkat v11.0.0
key.UseSshCertificate(sbSshCert.GetAsString());

Chilkat.SFtp sftp = new Chilkat.SFtp();

string hostname = "sftp.example.com";
int port = 22;
success = sftp.Connect(hostname,port);
if (success != true) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

success = sftp.AuthenticatePk("myLogin",key);
if (success != true) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

Debug.WriteLine("Public-Key Authentication using an SSH Certificate was Successful!");