RSA OAEP Padding

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Demonstrates how to use OAEP padding with the RSA encryption algorithm. More information about OAEP Padding.

Dim rsa As New Chilkat.Rsa()

Dim success As Boolean
success = rsa.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    MsgBox("RSA component unlock failed")
    Exit Sub
End If


'  RSA public key in XML format:
Dim publicKey As String
publicKey = "<RSAKeyValue><Modulus>of3im3mRgd2NLXIGoK6uYLg6jj0Ug2b42rnqa5Tbwz2ieFqMJqt+++x2oqLYGurlz49nt+7/785g3XYWqoka4u9c9zul6YubIjnBM72dQy7rEkEfbUxgjcxqXyjZFx+FpaxFUecLu688XEu+9UA42VKiCgcl+E7TrqnfeeYpNXc=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>"

rsa.ImportPublicKey(publicKey)

'  To use Optimal Asymmetric Encryption Padding (OAEP) padding,
'  simply set the OaepPadding property:
rsa.OaepPadding = true

'  Encrypt a string and return the encrypted data base64-encoded:
rsa.EncodingMode = "base64"

Dim plainText As String
plainText = "RSA Encryption should be easy."

Dim usePrivateKey As Boolean
usePrivateKey = false
Dim encryptedStr As String
encryptedStr = rsa.EncryptStringENC(plainText,usePrivateKey)
TextBox1.Text = TextBox1.Text & encryptedStr & vbCrLf
TextBox1.Refresh()