VB.NET

Encrypt Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.Encrypt, which encrypts a string and returns the resulting JWE. The charset argument converts the text to bytes before encryption.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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VB.NET

Dim success As Boolean = False

Dim jwe As New Chilkat.Jwe

'  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
'  encryption algorithm (enc).
Dim header As New Chilkat.JsonObject
header.UpdateString("alg","A256KW")
header.UpdateString("enc","A256GCM")
success = jwe.SetProtectedHeader(header)
If (success = False) Then
    Debug.WriteLine(jwe.LastErrorText)
    Exit Sub
End If


'  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key
'  from a secure source rather than hard-coding it.
Dim base64Key As String = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe.SetWrappingKey(0,base64Key,"base64")
If (success = False) Then
    Debug.WriteLine(jwe.LastErrorText)
    Exit Sub
End If


'  Encrypt the content.  The 2nd argument is the charset used to convert the text to bytes.  The
'  returned string is the JWE (compact serialization by default).
Dim jweCompact As String = jwe.Encrypt("This is the secret content.","utf-8")
If (jwe.LastMethodSuccess = False) Then
    Debug.WriteLine(jwe.LastErrorText)
    Exit Sub
End If

Debug.WriteLine(jweCompact)