(VBScript) JWE using ECDH-ES, BP-256, A256GCM

See more JSON Web Encryption (JWE) Examples

Create a JWE with the following header:

	{
	  "alg": "ECDH-ES",
	  "enc": "A256GCM",
	  "exp": 1621957030,
	  "cty": "NJWT",
	  "epk": {
	    "kty": "EC",
	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
	    "crv": "BP-256"
	  }
	}

Note: This example requires Chilkat v9.5.0.87 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

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

' Load our brainpool BP-256 public key.

' 	{
' 	  "use": "enc",
' 	  "kid": "puk_idp_enc",
' 	  "kty": "EC",
' 	  "crv": "BP-256",
' 	  "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w",
' 	  "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
' 	}

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = CreateObject("Chilkat.JsonObject")
success = json.UpdateString("use","enc")
success = json.UpdateString("kid","puk_idp_enc")
success = json.UpdateString("kty","EC")
success = json.UpdateString("crv","BP-256")
success = json.UpdateString("x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
success = json.UpdateString("y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.PublicKey")
set pubkey = CreateObject("Chilkat.PublicKey")

success = pubkey.LoadFromString(json.Emit())
If (success = 0) Then
    outFile.WriteLine(pubkey.LastErrorText)
    WScript.Quit
End If

' Build our protected header:

' 	{
' 	  "alg": "ECDH-ES",
' 	  "enc": "A256GCM",
' 	  "exp": 1621957030,
' 	  "cty": "NJWT",
' 	  "epk": {
' 	    "kty": "EC",
' 	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
' 	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
' 	    "crv": "BP-256"
' 	  }
' 	}

' Use jwt only for getting the current date/time + 3600 seconds.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Jwt")
set jwt = CreateObject("Chilkat.Jwt")

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set jweProtHdr = CreateObject("Chilkat.JsonObject")
success = jweProtHdr.UpdateString("alg","ECDH-ES")
success = jweProtHdr.UpdateString("enc","A256GCM")
success = jweProtHdr.UpdateInt("exp",jwt.GenNumericDate(3600))
success = jweProtHdr.UpdateString("cty","NJWT")
success = jweProtHdr.UpdateString("epk.kty","EC")
success = jweProtHdr.UpdateString("epk.x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
success = jweProtHdr.UpdateString("epk.y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")
success = jweProtHdr.UpdateString("epk.crv","BP-256")

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Jwe")
set jwe = CreateObject("Chilkat.Jwe")
success = jwe.SetProtectedHeader(jweProtHdr)
success = jwe.SetPublicKey(0,pubkey)

plainText = "This is the text to be encrypted."
strJwe = jwe.Encrypt(plainText,"utf-8")
If (jwe.LastMethodSuccess <> 1) Then
    outFile.WriteLine(jwe.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine(strJwe)

outFile.WriteLine("Success.")

outFile.Close