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(Objective-C) RSA Signature/Verify with .key and .cerSee more RSA ExamplesDemonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.Note: This example requires Chilkat v11.0.0 or greater.
#import <CkoPrivateKey.h> #import <CkoRsa.h> #import <NSString.h> #import <CkoCert.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. CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init]; // Load the private key from an RSA .key file: success = [privKey LoadPemFile: @"privateKey.key"]; if (success == NO) { NSLog(@"%@",privKey.LastErrorText); return; } CkoRsa *rsa = [[CkoRsa alloc] init]; // Import the private key into the RSA component: success = [rsa UsePrivateKey: privKey]; if (success == NO) { NSLog(@"%@",rsa.LastErrorText); return; } // Create the signature as a hex string: rsa.EncodingMode = @"hex"; NSString *strData = @"This is the string to be signed."; // Sign the string using the sha256 hash algorithm. // Other valid choices are "md2", "sha1", "sha384", // "sha512", and "md5". NSString *hexSig = [rsa SignStringENC: strData hashAlg: @"sha256"]; NSLog(@"%@",hexSig); // Load a digital certificate from a .cer file: CkoCert *cert = [[CkoCert alloc] init]; success = [cert LoadFromFile: @"myCert.cer"]; if (success == NO) { NSLog(@"%@",cert.LastErrorText); return; } CkoPublicKey *pubKey = [[CkoPublicKey alloc] init]; [cert GetPublicKey: pubKey]; // Now verify using a new instance of the RSA object: CkoRsa *rsa2 = [[CkoRsa alloc] init]; // Import the public key into the RSA object: success = [rsa2 UsePublicKey: pubKey]; if (success == NO) { NSLog(@"%@",rsa2.LastErrorText); return; } // The signature is a hex string, so make sure the EncodingMode is correct: rsa2.EncodingMode = @"hex"; // Verify the signature: success = [rsa2 VerifyStringENC: strData hashAlg: @"sha256" sig: hexSig]; if (success == NO) { NSLog(@"%@",rsa2.LastErrorText); return; } NSLog(@"%@",@"Success."); |
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