Visual FoxPro

Create JWS using the Flattened JSON Serialization Format

See more JSON Web Signatures (JWS) Examples

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

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

Visual FoxPro

LOCAL lnSuccess
LOCAL loSbEccJwk
LOCAL loEccKey
LOCAL loJwsProtHdr
LOCAL loJwsUnprotHdr
LOCAL loJws
LOCAL lnBIncludeBom
LOCAL lcPayloadStr
LOCAL lcJwsStr
LOCAL loJson

lnSuccess = 0

* 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.

* The JWS to be created will contain one signature using an ECDSA key.

loSbEccJwk = CreateObject('Chilkat.StringBuilder')
loSbEccJwk.Append('{"kty":"EC",')
loSbEccJwk.Append('"crv":"P-256",')
loSbEccJwk.Append('"x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",')
loSbEccJwk.Append('"y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0",')
loSbEccJwk.Append('"d":"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI"')
loSbEccJwk.Append("}")

loEccKey = CreateObject('Chilkat.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..)
lnSuccess = loEccKey.LoadJwk(loSbEccJwk.GetAsString())
IF (lnSuccess <> 1) THEN
    ? loEccKey.LastErrorText
    RELEASE loSbEccJwk
    RELEASE loEccKey
    CANCEL
ENDIF

* ---------------------------------------------------
* Prepare both a protected and unprotected header.

loJwsProtHdr = CreateObject('Chilkat.JsonObject')
loJwsProtHdr.AppendString("alg","ES256")

loJwsUnprotHdr = CreateObject('Chilkat.JsonObject')
loJwsUnprotHdr.AppendString("kid","myEcKey")

* ---------------------------------------------------
loJws = CreateObject('Chilkat.Jws')

loJws.SetProtectedHeader(0,loJwsProtHdr)
loJws.SetUnprotectedHeader(0,loJwsUnprotHdr)

loJws.SetPrivateKey(0,loEccKey)

lnBIncludeBom = 0
lcPayloadStr = "In our village, folks say God crumbles up the old moon into stars."
loJws.SetPayload(lcPayloadStr,"utf-8",lnBIncludeBom)

* ---------------------------------------------------
* Create the JWS.
* Indicate we prefer the non-compact, flattened serialization.
loJws.PreferCompact = 0
loJws.PreferFlattened = 1

lcJwsStr = loJws.CreateJws()
IF (loJws.LastMethodSuccess <> 1) THEN
    ? loJws.LastErrorText
    RELEASE loSbEccJwk
    RELEASE loEccKey
    RELEASE loJwsProtHdr
    RELEASE loJwsUnprotHdr
    RELEASE loJws
    CANCEL
ENDIF

* The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
* To get in human-readable format, load into a Chilkat JSON object and emit..
loJson = CreateObject('Chilkat.JsonObject')
loJson.Load(lcJwsStr)
loJson.EmitCompact = 0
? loJson.Emit()

* Sample output:

* { 
*   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
*   "protected": "eyJhbGciOiJFUzI1NiJ9",
*   "header": { 
*     "kid": "myEcKey"
*   },
*   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
* }

RELEASE loSbEccJwk
RELEASE loEccKey
RELEASE loJwsProtHdr
RELEASE loJwsUnprotHdr
RELEASE loJws
RELEASE loJson