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(Mono C#) RSA Sign Binary Data and Verify (Recover the Original Data)Demonstrates how to RSA sign binary data and then verify/recover the original data. Note: This example uses methods introduced in Chilkat v9.5.0.77.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Load an RSA private key for signing. Chilkat.PrivateKey privKey = new Chilkat.PrivateKey(); bool success = privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd"); if (success != true) { Debug.WriteLine(privKey.LastErrorText); return; } Chilkat.Rsa rsa = new Chilkat.Rsa(); rsa.ImportPrivateKeyObj(privKey); // We have some binary data (in hex) to sign string originalData = "0102030405060708090A"; Chilkat.BinData bd = new Chilkat.BinData(); bd.AppendEncoded(originalData,"hex"); // If successful, the contents of bd are replaced with the RSA signature. success = rsa.OpenSslSignBd(bd); if (success != true) { Debug.WriteLine(rsa.LastErrorText); return; } // Show the RSA signature in base64 Debug.WriteLine(bd.GetEncoded("base64")); // ------------------------------------------ // Get the public key from the private key Chilkat.PublicKey pubKey = privKey.GetPublicKey(); // Verify the signature and extract the original data. Chilkat.Rsa rsa2 = new Chilkat.Rsa(); rsa2.ImportPublicKeyObj(pubKey); bool bVerified = rsa2.OpenSslVerifyBd(bd); Debug.WriteLine("signature verified: " + Convert.ToString(bVerified)); // Show the original data: Debug.WriteLine("original data: " + bd.GetEncoded("hex")); |
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