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(Xojo Plugin) JWE using AES Key Wrap and AES_128_CBC_HMAC_SHA_256

This example duplicates the example A.3 in RFC 7516 for JSON Web Encryption (JWE).

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

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//  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
Dim plaintext As String
plaintext = "Live long and prosper."

Dim jwe As New Chilkat.Jwe

//  First build the JWE Protected Header: {"alg":"A128KW","enc":"A128CBC-HS256"}
Dim jweProtHdr As New Chilkat.JsonObject
success = jweProtHdr.AppendString("alg","A128KW")
success = jweProtHdr.AppendString("enc","A128CBC-HS256")
success = jwe.SetProtectedHeader(jweProtHdr)

System.DebugLog("JWE Protected Header: " + jweProtHdr.Emit())
System.DebugLog("--")

//  The example A.3 in RFC 7516 uses the following 128-bit AES key,
//  specified in JWK (JSON Web Key) format:
//       {"kty":"oct",
//        "k":"GawgguFyGrWKav7AX4VKUg"
//       }
//  This is just a way of saying: The key type ("kty") is
//  a bunch of octets ("k") in base64url encoding.
//  We can simply set the AES wrapping key like this:
Dim aesWrappingKey As String
aesWrappingKey = "GawgguFyGrWKav7AX4VKUg"
success = jwe.SetWrappingKey(0,aesWrappingKey,"base64url")

//  Encrypt and return the JWE:
Dim strJwe As String
strJwe = jwe.Encrypt(plaintext,"utf-8")
If (jwe.LastMethodSuccess <> True) Then
    System.DebugLog(jwe.LastErrorText)
    Return
End If

//  Show the JWE we just created:
System.DebugLog(strJwe)

//  Decrypt the JWE that was just produced.
//  1) Load the JWE.
//  2) Set the AES wrapping key.
//  3) Decrypt.
Dim jwe2 As New Chilkat.Jwe
success = jwe2.LoadJwe(strJwe)
If (success <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

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

//  Decrypt.
Dim originalPlaintext As String
originalPlaintext = jwe2.Decrypt(0,"utf-8")
If (jwe2.LastMethodSuccess <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

System.DebugLog("original text: ")
System.DebugLog(originalPlaintext)

//  ---------------------------------------------------------------------------------
//  It should also be possible to decrypt the JWE as shown in RFC 7516, Appendix A.3.7
//  because it was produced using the same AES Wrap key.

Dim sbJwe As New Chilkat.StringBuilder
success = sbJwe.Append("eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.")
success = sbJwe.Append("6KB707dM9YTIgHtLvtgWQ8mKwboJW3of9locizkDTHzBC2IlrT1oOQ.")
success = sbJwe.Append("AxY8DCtDaGlsbGljb3RoZQ.")
success = sbJwe.Append("KDlTtXchhZTGufMYmOYGS4HffxPSUrfmqCHXaI9wOGY.")
success = sbJwe.Append("U0m_YmjN04DJvceFICbCVQ")

success = jwe2.LoadJweSb(sbJwe)
If (success <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

success = jwe2.SetWrappingKey(0,aesWrappingKey,"base64url")

//  Decrypt.
originalPlaintext = jwe2.Decrypt(0,"utf-8")
If (jwe2.LastMethodSuccess <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

System.DebugLog(originalPlaintext)

 

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