(Xojo Plugin) RSA Encrypt Randomly Generated AES Key

Demonstrates how to RSA encrypt a randomly generated AES key.

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

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// First generate a 256-bit AES key (32 bytes).
Dim prng As New Chilkat.Prng
Dim bdAesKey As New Chilkat.BinData
Dim success As Boolean
success = prng.GenRandomBd(32,bdAesKey)

// Use a public key from a certificate for RSA encryption.
Dim cert As New Chilkat.Cert

success = cert.LoadFromFile("qa_data/pem/mf_public_rsa.pem")
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

Dim pubKey As Chilkat.PublicKey
pubKey = cert.ExportPublicKey()
If (cert.LastMethodSuccess <> True) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

Dim rsa As New Chilkat.Rsa
success = rsa.ImportPublicKeyObj(pubKey)
If (success = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// RSA encrypt our 32-byte AES key.
// The contents of bdAesKey are replaced with result of the RSA encryption.
success = rsa.EncryptBd(bdAesKey,False)
If (success = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// Return the result as a base64 string
Dim encryptedAesKey As String
encryptedAesKey = bdAesKey.GetEncoded("base64")

System.DebugLog("encrypted AES key = " + encryptedAesKey)