B4X Requires Chilkat v11.0.0+

RSA Encrypt Randomly Generated AES Key

See more RSA Examples

Demonstrates how to RSA encrypt a randomly generated AES key. B4X

Dim success As Boolean = False

'  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 ChilkatPrng
prng.Initialize
Dim bdAesKey As ChilkatBinData
bdAesKey.Initialize
success = prng.GenRandomBd(32, bdAesKey)

'  Use a public key from a certificate for RSA encryption.
Dim cert As ChilkatCert
cert.Initialize("cert")

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


Dim pubKey As ChilkatPublicKey
pubKey.Initialize
cert.GetPublicKey(pubKey)

Dim rsa As ChilkatRsa
rsa.Initialize
success = rsa.UsePublicKey(pubKey)
If success = False Then
    Log(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
    Log(rsa.LastErrorText)
    Return
End If


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

Log("encrypted AES key = " & encryptedAesKey)