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(VB.NET) Generate RSA Key and Sign a StringSee more RSA ExamplesDemonstrates how to generate a new RSA public/private key pair and use it to generate a signature for a string. The (binary) digital signature is returned as a hexidecimalized string.Note: This example requires Chilkat v11.0.0 or greater.
Dim success As Boolean = False ' This example assumes the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim rsa As New Chilkat.Rsa ' Generate a 2048-bit RSA key. Dim privKey As New Chilkat.PrivateKey success = rsa.GenKey(2048,privKey) rsa.UsePrivateKey(privKey) ' Return the signature in hex. rsa.EncodingMode = "hex" Dim strData As String = "This is the string to be signed." ' Sign the SHA256 hash of the string. Dim hexSig As String = rsa.SignStringENC(strData,"sha256") Debug.WriteLine(hexSig) ' Now verify the signature: Dim pubKey As New Chilkat.PublicKey privKey.ToPublicKey(pubKey) rsa.UsePublicKey(pubKey) success = rsa.VerifyStringENC(strData,"sha256",hexSig) If (success = True) Then Debug.WriteLine("Signature verified!") Else Debug.WriteLine(rsa.LastErrorText) End If ' Try it with an invalid signature: success = rsa.VerifyStringENC(strData,"sha256","not a valid sig") If (success = True) Then Debug.WriteLine("Signature verified!") Else Debug.WriteLine("Signature validation failed!") End If ' Try it with invalid data: success = rsa.VerifyStringENC("Not the original data","sha256",hexSig) If (success = True) Then Debug.WriteLine("Signature verified!") Else Debug.WriteLine("Signature validation failed!") End If |
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