(PowerBuilder) 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

integer li_rc
integer li_Success
oleobject loo_Json
oleobject loo_Pubkey
oleobject loo_Jwt
oleobject loo_JweProtHdr
oleobject loo_Jwe
string ls_PlainText
string ls_StrJwe

// 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"
// 	}

loo_Json = create oleobject
li_rc = loo_Json.ConnectToNewObject("Chilkat_9_5_0.JsonObject")
if li_rc < 0 then
    destroy loo_Json
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Json.UpdateString("use","enc")
loo_Json.UpdateString("kid","puk_idp_enc")
loo_Json.UpdateString("kty","EC")
loo_Json.UpdateString("crv","BP-256")
loo_Json.UpdateString("x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
loo_Json.UpdateString("y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")

loo_Pubkey = create oleobject
li_rc = loo_Pubkey.ConnectToNewObject("Chilkat_9_5_0.PublicKey")

li_Success = loo_Pubkey.LoadFromString(loo_Json.Emit())
if li_Success = 0 then
    Write-Debug loo_Pubkey.LastErrorText
    destroy loo_Json
    destroy loo_Pubkey
    return
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.
loo_Jwt = create oleobject
li_rc = loo_Jwt.ConnectToNewObject("Chilkat_9_5_0.Jwt")

loo_JweProtHdr = create oleobject
li_rc = loo_JweProtHdr.ConnectToNewObject("Chilkat_9_5_0.JsonObject")

loo_JweProtHdr.UpdateString("alg","ECDH-ES")
loo_JweProtHdr.UpdateString("enc","A256GCM")
loo_JweProtHdr.UpdateInt("exp",loo_Jwt.GenNumericDate(3600))
loo_JweProtHdr.UpdateString("cty","NJWT")
loo_JweProtHdr.UpdateString("epk.kty","EC")
loo_JweProtHdr.UpdateString("epk.x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
loo_JweProtHdr.UpdateString("epk.y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")
loo_JweProtHdr.UpdateString("epk.crv","BP-256")

loo_Jwe = create oleobject
li_rc = loo_Jwe.ConnectToNewObject("Chilkat_9_5_0.Jwe")

loo_Jwe.SetProtectedHeader(loo_JweProtHdr)
loo_Jwe.SetPublicKey(0,loo_Pubkey)

ls_PlainText = "This is the text to be encrypted."
ls_StrJwe = loo_Jwe.Encrypt(ls_PlainText,"utf-8")
if loo_Jwe.LastMethodSuccess <> 1 then
    Write-Debug loo_Jwe.LastErrorText
    destroy loo_Json
    destroy loo_Pubkey
    destroy loo_Jwt
    destroy loo_JweProtHdr
    destroy loo_Jwe
    return
end if

Write-Debug ls_StrJwe

Write-Debug "Success."


destroy loo_Json
destroy loo_Pubkey
destroy loo_Jwt
destroy loo_JweProtHdr
destroy loo_Jwe