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(Xojo Plugin) 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.
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 .key file: success = privKey.LoadPemFile("privateKey.key") 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 // Create the signature as a hex string: 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 "md2", "sha1", "sha384", // "sha512", and "md5". Dim hexSig As String hexSig = rsa.SignStringENC(strData,"sha256") System.DebugLog(hexSig) // Load a digital certificate from a .cer file: Dim cert As New Chilkat.Cert success = cert.LoadFromFile("myCert.cer") If (success = False) Then System.DebugLog(cert.LastErrorText) Return End If Dim pubKey As New Chilkat.PublicKey success = cert.GetPublicKey(pubKey) // Now verify using a new instance of the RSA object: Dim rsa2 As New Chilkat.Rsa // Import the public key into the RSA object: success = rsa2.UsePublicKey(pubKey) If (success = False) Then System.DebugLog(rsa2.LastErrorText) Return End If // 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) Then System.DebugLog(rsa2.LastErrorText) Return End If System.DebugLog("Success.") |
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