Generate DSA SSH Key

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

Download: Chilkat Cocoa Objective-C Libraries

NSMutableString *strOutput = [NSMutableString stringWithCapacity:1000];

CkoSshKey *key = [[[CkoSshKey alloc] init] autorelease];

BOOL success;

int numBits;

//  numBits should be a minimum of 1024 and
//  a multiple of 64.  Typical values are
//  1024 or 2048.
numBits = 2048;
success = [key GenerateDsaKey: [NSNumber numberWithInt: numBits]];
if (success != YES) {
    [strOutput appendString: @"Invalid numBits passed to DSA key generation method."];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    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).

NSString *exportedKey;
BOOL exportEncrypted;

//  Export the DSA private key to OpenSSH, PuTTY, and XML and save.
exportEncrypted = NO;
exportedKey = [key ToOpenSshPrivateKey: exportEncrypted];
//  Chilkat provides a SaveText method for convenience...
success = [key SaveText: exportedKey filename: @"privkey_openssh_unencrypted.pem"];

//  Export with encryption to OpenSSH private key format:
key.Password = @"secret";
exportEncrypted = YES;
exportedKey = [key ToOpenSshPrivateKey: exportEncrypted];
success = [key SaveText: exportedKey filename: @"privkey_openssh_encrypted.pem"];

//  Export the DSA private key to unencrypted PuTTY format:
exportEncrypted = NO;
exportedKey = [key ToPuttyPrivateKey: exportEncrypted];
success = [key SaveText: exportedKey filename: @"privkey_putty_unencrypted.ppk"];

//  Export the DSA private key to encrypted PuTTY format:
key.Password = @"secret";
exportEncrypted = YES;
exportedKey = [key ToPuttyPrivateKey: exportEncrypted];
success = [key SaveText: exportedKey filename: @"privkey_putty_encrypted.ppk"];

//  Export private key to XML:
exportedKey = [key ToXml];
success = [key SaveText: exportedKey filename: @"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 filename: @"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 filename: @"pubkey_openSsh.pub"];

[strOutput appendString: @"Finished."];
[strOutput appendString: @"\n"];


self.mainTextField.stringValue = strOutput;