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(Xojo Plugin) 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.
Dim success As Boolean success = False // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Dim privKey As New Chilkat.PrivateKey // Load the private key from an RSA PEM file: success = privKey.LoadAnyFormatFile("raul_privateKey.key","a0123456789") If (success = False) Then System.DebugLog(privKey.LastErrorText) Return End If Dim rsa As New Chilkat.Rsa // Import the private key into the RSA component: success = rsa.UsePrivateKey(privKey) If (success = False) Then System.DebugLog(rsa.LastErrorText) Return End If // 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" Dim strData As 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. Dim hexSig As String hexSig = rsa.SignStringENC(strData,"sha256") If (rsa.LastMethodSuccess = False) Then System.DebugLog(rsa.LastErrorText) Return End If System.DebugLog(hexSig) // Now verify with the public key. // This example shows how to use the public key from // a digital certificate (.cer file) Dim cert As New Chilkat.Cert success = cert.LoadFromFile("raul_publicKey.cer") If (success = False) Then System.DebugLog(cert.LastErrorText) Return End If Dim pubKey As New Chilkat.PublicKey success = cert.GetPublicKey(pubKey) Dim rsa2 As New Chilkat.Rsa success = rsa2.UsePublicKey(pubKey) If (success = False) Then System.DebugLog(rsa2.LastErrorText) Return End If // Verify the signature against the original data: rsa2.EncodingMode = "hex" success = rsa2.VerifyStringENC(strData,"sha256",hexSig) If (success = False) Then System.DebugLog(rsa2.LastErrorText) Return End If System.DebugLog("Signature verified!") // Verify with incorrect data: success = rsa2.VerifyStringENC("something else","sha256",hexSig) If (success <> True) Then System.DebugLog("Signature not verified! (which was expected in this case)") Else System.DebugLog("Hmmm... that's not right...") End If |
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