(Objective-C) RSA Encrypt with Modulus and Exponent

Demonstrates how to RSA encrypt with a given modulus and exponent.

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#import <CkoRsa.h>
#import <NSString.h>
#import <CkoXml.h>

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

CkoRsa *rsa = [[CkoRsa alloc] init];

// Assuming you already have a base64 modulus and exponent,
// wrap it in XML like this:
NSString *modulus = @"qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM=";
NSString *exponent = @"AQAB";

CkoXml *xml = [[CkoXml alloc] init];
xml.Tag = @"RSAPublicKey";
[xml NewChild2: @"Modulus" content: modulus];
[xml NewChild2: @"Exponent" content: exponent];

// Encrypt with the public key.
NSString *publicKey = [xml GetXml];
BOOL success = [rsa ImportPublicKey: publicKey];

BOOL usePrivateKey = NO;
NSString *plainText = @"message in a bottle";

rsa.EncodingMode = @"base64";
NSString *encryptedStrBase64 = [rsa EncryptStringENC: plainText bUsePrivateKey: usePrivateKey];
NSLog(@"%@",encryptedStrBase64);