(Objective-C) Load an SSH Key from a File (Many Formats Supported)

Demonstrates how to load an SSH public or private key object from a file. The file can be in any of the following formats:

• OpenSSH private key
• OpenSSH public key
• PuTTY private key
• RFC 4716 public key

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

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

// First, use the LoadText convenience method to load a text file (of any SSH key format)
// into a string:
NSString *strKey = [sshkey LoadText: @"../mySshKeys/myKey.txt"];

// Next, load the key into the SSH key object.

// If the key is an OpenSSH private key:
// (In actuality, the From* methods will automatically detect the format and load
// the key correctly.  For example, if a PuTTY private key is passed to FromOpenSshPrivateKey,
// it  will still load correctly.)
BOOL success = [sshkey FromOpenSshPrivateKey: strKey];
if (success != YES) {
    NSLog(@"%@",sshkey.LastErrorText);
}
else {
    NSLog(@"%@",@"Loaded OpenSSH private key.");
    return;
}

// If the key is an OpenSSH public key:
success = [sshkey FromOpenSshPublicKey: strKey];
if (success != YES) {
    NSLog(@"%@",sshkey.LastErrorText);
}
else {
    NSLog(@"%@",@"Loaded OpenSSH public key.");
    return;
}

// If the key is a PuTTY private key:
success = [sshkey FromPuttyPrivateKey: strKey];
if (success != YES) {
    NSLog(@"%@",sshkey.LastErrorText);
}
else {
    NSLog(@"%@",@"Loaded PuTTY private key.");
    return;
}

// If the key is an RFC 4716 public key:
success = [sshkey FromRfc4716PublicKey: strKey];
if (success != YES) {
    NSLog(@"%@",sshkey.LastErrorText);
}
else {
    NSLog(@"%@",@"Loaded RFC 4716 public key.");
}