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(Classic ASP) Create a JWS Using ECDSA P-521 SHA-512

Creates and verifies a JSON Web Signature (JWS) that uses ECDSA P-521 SHA-512

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
'  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.

'  Use the following ECC key loaded from JWK format.
set sbJwk = Server.CreateObject("Chilkat_9_5_0.StringBuilder")
success = sbJwk.Append("{""kty"":""EC"",")
success = sbJwk.Append("""crv"":""P-521"",")
success = sbJwk.Append("""x"":""AekpBQ8ST8a8VcfVOTNl353vSrDCLLJXmPk06wTjxrrjcBpXp5EOnYG_NjFZ6OvLFV1jSfS9tsz4qUxcWceqwQGk"",")
success = sbJwk.Append("""y"":""ADSmRA43Z1DSNx_RvcLI87cdL07l6jQyyBXMoxVg_l2Th-x3S1WDhjDly79ajL4Kkd0AZMaZmh9ubmf63e3kyMj2"",")
success = sbJwk.Append("""d"":""AY5pb7A0UFiB3RELSD64fTLOSV_jazdF7fLYyuTw8lOfRhWg6Y6rUrPAxerEzgdRhajnu0ferB0d53vM9mE15j2C""")
success = sbJwk.Append("}")

set eccKey = Server.CreateObject("Chilkat_9_5_0.PrivateKey")
'  Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
'  into the private key object. (See the online reference documentation..)
success = eccKey.LoadJwk(sbJwk.GetAsString())
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( eccKey.LastErrorText) & "</pre>"
    Response.End
End If

'  Create the JWS Protected Header
set jwsProtHdr = Server.CreateObject("Chilkat_9_5_0.JsonObject")
success = jwsProtHdr.AppendString("alg","ES512")

set jws = Server.CreateObject("Chilkat_9_5_0.Jws")

'  Set the protected header:
signatureIndex = 0
success = jws.SetProtectedHeader(signatureIndex,jwsProtHdr)

'  Set the ECC key:
success = jws.SetPrivateKey(signatureIndex,eccKey)

'  Set the payload.
bIncludeBom = 0
payloadStr = "In our village, folks say God crumbles up the old moon into stars."
success = jws.SetPayload(payloadStr,"utf-8",bIncludeBom)

'  Create the JWS
'  By default, the compact serialization is used.
jwsCompact = jws.CreateJws()
If (jws.LastMethodSuccess <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( jws.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "JWS: " & jwsCompact) & "</pre>"

'  Note: ECC signatures use random values, so the output will be different each time a signature is produced.
'  sample output:
'  JWS: eyJhbGciOiJFUzUxMiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.AFOnOtZ8UTp-ed1PfLfXxwGU7zT_jnmGGxew-d1CP6SfKa5RUhav5mF4szhSof22JaoQ742VIa0eZ0s1rhBnj8y6APr6g6vKzIpYZlJsnjzjUwAjDQOLmcsjxrrRfATh-NEv7G0Z9FrjdJasS44tCG2EnG6aT2TW-sPG0dy5o9jUWCzi

'  Now load the JWS, validate, and recover the original text.
set jws2 = Server.CreateObject("Chilkat_9_5_0.Jws")

'  Load the JWS.
success = jws2.LoadJws(jwsCompact)

' eccPubKey is a Chilkat_9_5_0.PublicKey
Set eccPubKey = eccKey.GetPublicKey()

'  Set the ECC public key used for validation.
signatureIndex = 0
success = jws2.SetPublicKey(signatureIndex,eccPubKey)

'  Validate the 1st (and only) signature at index 0..
v = jws2.Validate(signatureIndex)
If (v < 0) Then
    '  Perhaps Chilkat was not unlocked or the trial expired..
    Response.Write "<pre>" & Server.HTMLEncode( "Method call failed for some other reason.") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( jws2.LastErrorText) & "</pre>"
    Response.End
End If

If (v = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Invalid signature.  The ECC key was incorrect, the JWS was invalid, or both.") & "</pre>"
    Response.End
End If

'  If we get here, the signature was validated..
Response.Write "<pre>" & Server.HTMLEncode( "Signature validated.") & "</pre>"

'  Recover the original content:
Response.Write "<pre>" & Server.HTMLEncode( jws2.GetPayload("utf-8")) & "</pre>"

'  Examine the protected header:
' joseHeader is a Chilkat_9_5_0.JsonObject
Set joseHeader = jws2.GetProtectedHeader(signatureIndex)
If (jws2.LastMethodSuccess <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "No protected header found at the given index.") & "</pre>"
    Response.End
End If

joseHeader.EmitCompact = 0

Response.Write "<pre>" & Server.HTMLEncode( "Protected (JOSE) header:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( joseHeader.Emit()) & "</pre>"

'  Output:
'  	Signature validated.
'  	In our village, folks say God crumbles up the old moon into stars.
'  	Protected (JOSE) header:
'  	{
'  	  "alg": "ES512"
'  	}

%>
</body>
</html>

 

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