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(Excel) 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 Chilkat.Jwe
Set jwe = Chilkat.NewJwe

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

Debug.Print "JWE Protected Header: "; jweProtHdr.Emit()
Debug.Print "--"

'  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
    Debug.Print jwe.LastErrorText
    Exit Sub
End If

'  Show the JWE we just created:
Debug.Print strJwe

'  Decrypt the JWE that was just produced.
'  1) Load the JWE.
'  2) Set the AES wrapping key.
'  3) Decrypt.
Dim jwe2 As Chilkat.Jwe
Set jwe2 = Chilkat.NewJwe
success = jwe2.LoadJwe(strJwe)
If (success <> True) Then
    Debug.Print jwe2.LastErrorText
    Exit Sub
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
    Debug.Print jwe2.LastErrorText
    Exit Sub
End If

Debug.Print "original text: "
Debug.Print 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 Chilkat.StringBuilder
Set sbJwe = Chilkat.NewStringBuilder
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
    Debug.Print jwe2.LastErrorText
    Exit Sub
End If

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

'  Decrypt.
originalPlaintext = jwe2.Decrypt(0,"utf-8")
If (jwe2.LastMethodSuccess <> True) Then
    Debug.Print jwe2.LastErrorText
    Exit Sub
End If

Debug.Print originalPlaintext

 

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