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(Xojo Plugin) JWE with Binary Data

Demonstrates how to create a JWE that contains a binary payload (such as a JPG image).

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM

//  This requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  Note: This example requires Chilkat v9.5.0.66 or greater.

Dim success As Boolean

//  Load a JPG file that will be the JWE payload.
Dim jpgBytes As New Chilkat.BinData
success = jpgBytes.LoadFile("qa_data/jpg/starfish.jpg")
//  Make sure your app checks the success/failure of the call to LoadFile..
System.DebugLog("Original JPG size = " + Str(jpgBytes.NumBytes))

Dim jwe As New Chilkat.Jwe

Dim jweProtHdr As New Chilkat.JsonObject
success = jweProtHdr.AppendString("alg","A128KW")
success = jweProtHdr.AppendString("enc","A128CBC-HS256")
success = jwe.SetProtectedHeader(jweProtHdr)

Dim aesWrappingKey As String
aesWrappingKey = "GawgguFyGrWKav7AX4VKUg"
success = jwe.SetWrappingKey(0,aesWrappingKey,"base64url")

//  Encrypt and return the JWE in sbJwe:
Dim sbJwe As New Chilkat.StringBuilder
success = jwe.EncryptBd(jpgBytes,sbJwe)
If (success <> True) Then
    System.DebugLog(jwe.LastErrorText)
    Return
End If

//  Show the JWE:
System.DebugLog(sbJwe.GetAsString())
System.DebugLog("size of JWE: " + Str(sbJwe.Length))

//  ---------------------------------------------------------
//  Decrypt to get the original JPG file..

Dim jwe2 As New Chilkat.Jwe
success = jwe2.LoadJweSb(sbJwe)
If (success <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

//  Set the AES wrap key.
success = jwe2.SetWrappingKey(0,aesWrappingKey,"base64url")

//  Decrypt.
Dim jpgOriginal As New Chilkat.BinData
success = jwe2.DecryptBd(0,jpgOriginal)
If (success <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

System.DebugLog("Decrypted JPG size = " + Str(jpgOriginal.NumBytes))

//  Save the decrypted JPG to a file.
success = jpgOriginal.WriteFile("qa_output/jwe_decrypted_starfish.jpg")

System.DebugLog("success = " + Str(success))

//  The output of this program, when tested, was:
//  Original JPG size = 6229
//  eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.9YFz_wteV ... 7Et3hKhpxnKEXw
//  size of JWE: 8473
//  Decrypted JPG size = 6229
//  success = True

 

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