B4X Requires Chilkat v11.0.0+

Generate an RSA Key and Get as Base64 DER

See more RSA Examples

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER. B4X

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 ChilkatRsa
rsa.Initialize

'  Generate a 2048-bit key.
Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = rsa.GenKey(2048, privKey)
If success = False Then
    Log(rsa.LastErrorText)
    Return
End If


'  Get the public part of the key.
Dim pubKey As ChilkatPublicKey
pubKey.Initialize
privKey.ToPublicKey(pubKey)

'  There are two possible formats for representing the RSA public key 
'  in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
'  We can get either by setting bChoosePkcs1 to True or False.
Dim bChoosePkcs1 As Boolean = True
Dim pubKeyBase64Der As String = pubKey.GetEncoded(bChoosePkcs1, "base64")
Log("Public Key Base64 DER:")
Log(pubKeyBase64Der)

'  Get the private key as Base64 DER:
'  We can get PKCS1 or PKCS8, but with different methods:
Dim privKeyPkcs1 As String = privKey.GetPkcs1ENC("base64")
Log("Private Key PKCS1 Base64 DER:")
Log(privKeyPkcs1)

Dim privKeyPkcs8 As String = privKey.GetPkcs8ENC("base64")
Log("Private Key PKCS8 Base64 DER:")
Log(privKeyPkcs8)