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(Objective-C) Generate RSA Key and Sign a StringSee more RSA ExamplesDemonstrates how to generate a new RSA public/private key pair and use it to generate a signature for a string. The (binary) digital signature is returned as a hexidecimalized string.Note: This example requires Chilkat v11.0.0 or greater.
#import <CkoRsa.h> #import <CkoPrivateKey.h> #import <NSString.h> #import <CkoPublicKey.h> BOOL success = NO; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkoRsa *rsa = [[CkoRsa alloc] init]; // Generate a 2048-bit RSA key. CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init]; success = [rsa GenKey: [NSNumber numberWithInt: 2048] privKey: privKey]; [rsa UsePrivateKey: privKey]; // Return the signature in hex. rsa.EncodingMode = @"hex"; NSString *strData = @"This is the string to be signed."; // Sign the SHA256 hash of the string. NSString *hexSig = [rsa SignStringENC: strData hashAlg: @"sha256"]; NSLog(@"%@",hexSig); // Now verify the signature: CkoPublicKey *pubKey = [[CkoPublicKey alloc] init]; [privKey ToPublicKey: pubKey]; [rsa UsePublicKey: pubKey]; success = [rsa VerifyStringENC: strData hashAlg: @"sha256" sig: hexSig]; if (success == YES) { NSLog(@"%@",@"Signature verified!"); } else { NSLog(@"%@",rsa.LastErrorText); } // Try it with an invalid signature: success = [rsa VerifyStringENC: strData hashAlg: @"sha256" sig: @"not a valid sig"]; if (success == YES) { NSLog(@"%@",@"Signature verified!"); } else { NSLog(@"%@",@"Signature validation failed!"); } // Try it with invalid data: success = [rsa VerifyStringENC: @"Not the original data" hashAlg: @"sha256" sig: hexSig]; if (success == YES) { NSLog(@"%@",@"Signature verified!"); } else { NSLog(@"%@",@"Signature validation failed!"); } |
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