(Objective-C) SSH Public Key Authentication

Demonstrates how to authenticate with an SSH server using public key authentication.

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#import <CkoSsh.h>
#import <NSString.h>
#import <CkoSshKey.h>

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

CkoSsh *ssh = [[CkoSsh alloc] init];

// Set some timeouts, in milliseconds:
ssh.ConnectTimeoutMs = [NSNumber numberWithInt:5000];
ssh.IdleTimeoutMs = [NSNumber numberWithInt:15000];

// Connect to the SSH server.  
// The standard SSH port = 22
// The hostname may be a hostname or IP address.
NSString *hostname = @"sftp.example.com";
int port = 22;
BOOL success = [ssh Connect: hostname port: [NSNumber numberWithInt: port]];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

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

// Read the PEM file into a string variable:
// (This does not load the PEM file into the key.  The LoadText
// method is a convenience method for loading the full contents of ANY text
// file into a string variable.)
NSString *privKey = [key LoadText: @"myPrivateKey.pem"];
if (key.LastMethodSuccess != YES) {
    NSLog(@"%@",key.LastErrorText);
    return;
}

// Load a private key from a PEM string:
// (Private keys may be loaded from OpenSSH and Putty formats.
// Both encrypted and unencrypted private key file formats
// are supported.  This example loads an unencrypted private
// key in OpenSSH format.  PuTTY keys typically use the .ppk
// file extension, while OpenSSH keys use the PEM format.
// (For PuTTY keys, call FromPuttyPrivateKey instead.)
success = [key FromOpenSshPrivateKey: privKey];
if (success != YES) {
    NSLog(@"%@",key.LastErrorText);
    return;
}

// Authenticate with the SSH server using the login and
// private key.  (The corresponding public key should've 
// been installed on the SSH server beforehand.)
success = [ssh AuthenticatePk: @"myLogin" privateKey: key];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

NSLog(@"%@",ssh.LastErrorText);
NSLog(@"%@",@"Public-Key Authentication Successful!");