Generate RSA SSH Key

Generates an RSA SSH key and saves to various public and private key file formats (OpenSSH and PuTTY).

Download: Chilkat .NET Assemblies

Chilkat.SshKey key = new Chilkat.SshKey();

bool success;

int numBits;
int exponent;

//  numBits may range from 384 to 4096.  Typical values are
//  1024 or 2048.  (must be a multiple of 64)
//  A good choice for the exponent is 65537.  Chilkat recommends
//  always using this value.
numBits = 2048;
exponent = 65537;
success = key.GenerateRsaKey(numBits,exponent);
if (success != true) {
    textBox1.Text += "Bad params passed to RSA key generation method." + "\r\n";
    return;
}

//  Note: Generating a public/private key pair is CPU intensive
//  and may take a short amount of time (more than few seconds,
//  but less than a minute).

string exportedKey;
bool exportEncrypted;

//  Export the RSA private key to OpenSSH, PuTTY, and XML and save.
exportEncrypted = false;
exportedKey = key.ToOpenSshPrivateKey(exportEncrypted);
//  Chilkat provides a SaveText method for convenience...
success = key.SaveText(exportedKey,"privkey_openssh_unencrypted.pem");

//  Export with encryption to OpenSSH private key format:
key.Password = "secret";
exportEncrypted = true;
exportedKey = key.ToOpenSshPrivateKey(exportEncrypted);
success = key.SaveText(exportedKey,"privkey_openssh_encrypted.pem");

//  Export the RSA private key to unencrypted PuTTY format:
exportEncrypted = false;
exportedKey = key.ToPuttyPrivateKey(exportEncrypted);
success = key.SaveText(exportedKey,"privkey_putty_unencrypted.ppk");

//  Export the RSA private key to encrypted PuTTY format:
key.Password = "secret";
exportEncrypted = true;
exportedKey = key.ToPuttyPrivateKey(exportEncrypted);
success = key.SaveText(exportedKey,"privkey_putty_encrypted.ppk");

//  Export private key to XML:
exportedKey = key.ToXml();
success = key.SaveText(exportedKey,"privkey.xml");

//  ----------------------------------------------------
//  Now for the public key....
//  ----------------------------------------------------

//  The Secure Shell (SSH) Public Key File Format
//  is documented in RFC 4716.
exportedKey = key.ToRfc4716PublicKey();
success = key.SaveText(exportedKey,"pubkey_rfc4716.pub");

//  OpenSSH has a separate public-key file format, which
//  is also supported by Chilkat SshKey:
exportedKey = key.ToOpenSshPublicKey();
success = key.SaveText(exportedKey,"pubkey_openSsh.pub");

textBox1.Text += "Finished." + "\r\n";