(Xojo Plugin) Generate RSA Key and Sign a String

See more RSA Examples

Demonstrates 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.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// 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 success As Boolean
success = rsa.GenerateKey(2048)

// To return the signature in hex.
rsa.EncodingMode = "hex"

Dim strData As String
strData = "This is the string to be signed."

// Sign the SHA256 hash of the string.
Dim hexSig As String
hexSig = rsa.SignStringENC(strData,"sha256")

System.DebugLog(hexSig)
System.DebugLog(rsa.LastErrorText)

// Now verify the signature:
success = rsa.VerifyStringENC(strData,"sha256",hexSig)
If (success = True) Then
    System.DebugLog("Signature verified!")
Else
    System.DebugLog(rsa.LastErrorText)
End If

// Try it with an invalid signature:
success = rsa.VerifyStringENC(strData,"sha256","not a valid sig")
If (success = True) Then
    System.DebugLog("Signature verified!")
Else
    System.DebugLog(rsa.LastErrorText)
End If

// Try it with invalid data:
success = rsa.VerifyStringENC("Not the original data","sha256",hexSig)
If (success = True) Then
    System.DebugLog("Signature verified!")
Else
    System.DebugLog(rsa.LastErrorText)
End If

// Try it with the wrong hash algorithm:
success = rsa.VerifyStringENC(strData,"sha-1",hexSig)
If (success = True) Then
    System.DebugLog("Signature verified!")
Else
    System.DebugLog(rsa.LastErrorText)
End If