Objective-C

Load a Public Key from Base64 DER

Demonstrates the Chilkat PublicKey.LoadBase64 method, which loads a public key from standard Base64-encoded DER. The only argument is the Base64 string; whitespace within it is permitted.

Background: A public key in DER (binary) form is often carried as Base64 text so it can travel through channels that expect a string — a config value, a JSON field, a certificate export. This loader decodes that text and inspects the DER to determine the key type and structure automatically. It is the plain-Base64 counterpart to loading a full PEM block, which additionally has the BEGIN/END armor.

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Objective-C

#import <CkoPublicKey.h>
#import <NSString.h>

BOOL success = NO;

//  Demonstrates the PublicKey.LoadBase64 method, which loads a public key from standard
//  Base64-encoded DER.  The only argument is the Base64 string (whitespace is allowed).

CkoPublicKey *pubKey = [[CkoPublicKey alloc] init];

//  The Base64 of the DER-encoded public key.
NSString *keyStr = @"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA...IDAQAB";

success = [pubKey LoadBase64: keyStr];
if (success == NO) {
    NSLog(@"%@",pubKey.LastErrorText);
    return;
}

NSLog(@"%@%@%@",@"Loaded a ",pubKey.KeyType,@" public key.");