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(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.
bool success = false; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.PrivateKey privKey = new Chilkat.PrivateKey(); // Load the private key from an RSA .key file: success = privKey.LoadPemFile("privateKey.key"); if (success == false) { Debug.WriteLine(privKey.LastErrorText); return; } Chilkat.Rsa rsa = new Chilkat.Rsa(); // Import the private key into the RSA component: success = rsa.UsePrivateKey(privKey); if (success == false) { Debug.WriteLine(rsa.LastErrorText); return; } // Create the signature as a hex string: rsa.EncodingMode = "hex"; string 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". string hexSig = rsa.SignStringENC(strData,"sha256"); Debug.WriteLine(hexSig); // Load a digital certificate from a .cer file: Chilkat.Cert cert = new Chilkat.Cert(); success = cert.LoadFromFile("myCert.cer"); if (success == false) { Debug.WriteLine(cert.LastErrorText); return; } Chilkat.PublicKey pubKey = new Chilkat.PublicKey(); cert.GetPublicKey(pubKey); // Now verify using a new instance of the RSA object: Chilkat.Rsa rsa2 = new Chilkat.Rsa(); // Import the public key into the RSA object: success = rsa2.UsePublicKey(pubKey); if (success == false) { Debug.WriteLine(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,"sha256",hexSig); if (success == false) { Debug.WriteLine(rsa2.LastErrorText); return; } Debug.WriteLine("Success."); |
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