Xojo Plugin

Encrypt Binary Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptBd, which encrypts binary content held in a BinData and writes the resulting JWE into a StringBuilder.

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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Xojo Plugin

Dim success As Boolean
success = 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
success = header.UpdateString("alg","A256KW")
success = header.UpdateString("enc","A256GCM")
success = jwe.SetProtectedHeader(header)
If (success = False) Then
    System.DebugLog(jwe.LastErrorText)
    Return
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
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe.SetWrappingKey(0,base64Key,"base64")
If (success = False) Then
    System.DebugLog(jwe.LastErrorText)
    Return
End If

//  Encrypt binary content held in a BinData, writing the resulting JWE into a StringBuilder.
Dim bdContent As New Chilkat.BinData
success = bdContent.AppendString("Binary content to encrypt.","utf-8")

Dim sbJwe As New Chilkat.StringBuilder
success = jwe.EncryptBd(bdContent,sbJwe)
If (success = False) Then
    System.DebugLog(jwe.LastErrorText)
    Return
End If

System.DebugLog(sbJwe.GetAsString())