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(C#) RSA Sign with PKCS8 Encrypted KeyDemonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature (and then verify it). 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 PEM file: success = privKey.LoadAnyFormatFile("raul_privateKey.key","a0123456789"); 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; } // This example will sign a string, and receive the signature // in a hex-encoded string. Therefore, set the encoding mode // to "hex": rsa.EncodingMode = "hex"; string strData = "This is the string to be signed."; // Sign the string using the sha256 hash algorithm. // Other valid choices are sha1, sha384, sha512 and others. string hexSig = rsa.SignStringENC(strData,"sha256"); if (rsa.LastMethodSuccess == false) { Debug.WriteLine(rsa.LastErrorText); return; } Debug.WriteLine(hexSig); // Now verify with the public key. // This example shows how to use the public key from // a digital certificate (.cer file) Chilkat.Cert cert = new Chilkat.Cert(); success = cert.LoadFromFile("raul_publicKey.cer"); if (success == false) { Debug.WriteLine(cert.LastErrorText); return; } Chilkat.PublicKey pubKey = new Chilkat.PublicKey(); cert.GetPublicKey(pubKey); Chilkat.Rsa rsa2 = new Chilkat.Rsa(); success = rsa2.UsePublicKey(pubKey); if (success == false) { Debug.WriteLine(rsa2.LastErrorText); return; } // Verify the signature against the original data: rsa2.EncodingMode = "hex"; success = rsa2.VerifyStringENC(strData,"sha256",hexSig); if (success == false) { Debug.WriteLine(rsa2.LastErrorText); return; } Debug.WriteLine("Signature verified!"); // Verify with incorrect data: success = rsa2.VerifyStringENC("something else","sha256",hexSig); if (success != true) { Debug.WriteLine("Signature not verified! (which was expected in this case)"); } else { Debug.WriteLine("Hmmm... that's not right..."); } |
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