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(Visual FoxPro) Verify a Google JWT Using Google's Public KeySee more Google APIs ExamplesDemonstrates how to verify a JWT that was signed using Google's RSA private key. This example verifies the RSA signature. It also does the following:
LOCAL loHttp LOCAL loSbPubKeys LOCAL lnSuccess LOCAL lcToken LOCAL loJwt LOCAL lcHeader LOCAL loJson LOCAL lcKid LOCAL loJsonPubKeys LOCAL loJsonKey LOCAL loPubKey * This example assumes the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. loHttp = CreateObject('Chilkat_9_5_0.Http') loSbPubKeys = CreateObject('Chilkat_9_5_0.StringBuilder') lnSuccess = loHttp.QuickGetSb("https://www.googleapis.com/oauth2/v3/certs",loSbPubKeys) IF (lnSuccess = 0) THEN ? loHttp.LastErrorText RELEASE loHttp RELEASE loSbPubKeys CANCEL ENDIF ? loSbPubKeys.GetAsString() * Here are the keys: * { * "keys": [ * { * "e": "AQAB", * "n": "4bAT6C6EeX8Dspje3FrAXw-nnhNk04e1RmNa4kjc0CHf6Pk7ryARlwA-6YilyPABqQfYHx60s8oSnxvUVprFfQ2-Q8aAZO7bPKSxnoGlcKERL2oLNA4Msvc89N9Y5ycThZUplf_QC19e6jyYXN6Nz-UnJSCLrtQY8tVhhVRs61j4A2N_p-enAi-r704Qi1-v-DKV4eVRkClKViploo8NyjUaT9L4vbBssPCjyimJzsWnEe1fED5c4LnHeArYzA_FEn3JJotqDIz9t2VnvZNTMhizHEX4VnORlEWMEfR8n4CEHQx7PcQUOmfqyw08gWeXQl1-uTjtIGaE-sRIv9u_vQ", * "kty": "RSA", * "use": "sig", * "alg": "RS256", * "kid": "2af90e87be140c20038898a6efa11283dab6031d" * }, * { * "n": "nzGsrziOYrMVYMpvUZOwkKNiPWcOPTYRYlDSdRW4UpAHdWPbPlyqaaphYhoMB5DXrVxI3bdvm7DOlo-sHNnulmAFQa-7TsQMxrZCvVdAbyXGID9DZYEqf8mkCV1Ohv7WY5lDUqlybIk1OSHdK7-1et0QS8nn-5LojGg8FK4ssLf3mV1APpujl27D1bDhyRb1MGumXYElwlUms7F9p9OcSp5pTevXCLmXs9MJJk4o9E1zzPpQ9Ko0lH9l_UqFpA7vwQhnw0nbh73rXOX2TUDCUqL4ThKU5Z9Pd-eZCEOatKe0mJTpQ00XGACBME_6ojCdfNIJr84Y_IpGKvkAEksn9w", * "use": "sig", * "kid": "87bbe0815b064e6d449cac999f0e50e72a3e4374", * "e": "AQAB", * "alg": "RS256", * "kty": "RSA" * } * ] * } * ------------------------------------------------------------------------------------------- * Replace this with your actual token. * This sample token contains a kid that does not match any of the above Google public keys. * ------------------------------------------------------------------------------------------- lcToken = "eyJhbGciOiJSUzI1NiIsImtpZCI6IjQyZmY5MGQ3ZDM0OGM5NzM4MWE3YzExOWVmMWY1MzI0ZWEzZjViZWIifQ.eyJpc3MiOiJodHRwczovL2FjY291bnRzLmdvb2dsZS5jb20iLCJzdWIiOiIxMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExIiwiaWF0IjoxNjExMTE1MTQzLCJleHAiOjE2MTEyMDE1NDMsImF1ZCI6IjQyOTc1NzExNTE0ODg0OSJ9.pLem5i0bx3M7lJYj7jKv2Nq7c07X5YpZz-x1uM5RniW-v4LsX-lKIVvOq2x3-WoPqkzLXJfP0kG0dx1uD2q1NfFQK60YwKH4FnFtB6INnUP1dRVpP9_pTTKyAE28I3s5Tay4PbPdrCl7ZLCIJzCfpCW1TiWeVoPjp5HgZKTBHdP_sEkN_yO5dQerQXAkFJkV3kNgF9jI3ayT-KPqOIH6GVoWXjHFDyA2EYgJPEFRo5WSe6XycJ85p5duwT-OoBcb_kJZG9PxYd91eHlPCzp8vGxzIb2dVROCBxyM8e8W0cd9v15hfmpg9R-eG9vCM5y63ZLChZLFeHFx0Pd7hvAqfKg" loJwt = CreateObject('Chilkat_9_5_0.Jwt') lcHeader = loJwt.GetHeader(lcToken) ? lcHeader * Sample header: * {"alg":"RS256","kid":"87bbe0815b064e6d449cac999f0e50e72a3e4374"} * Load the public key matching the "kid" into a Chilkat public key object, then verify.. loJson = CreateObject('Chilkat_9_5_0.JsonObject') loJson.Load(lcHeader) lcKid = loJson.StringOf("kid") ? "kid = " + lcKid loJsonPubKeys = CreateObject('Chilkat_9_5_0.JsonObject') loJsonPubKeys.LoadSb(loSbPubKeys) loJsonKey = loJsonPubKeys.FindRecord("keys","kid",lcKid,1) IF (loJsonPubKeys.LastMethodSuccess = 0) THEN ? "Did not find a matching public key based on the kid." RELEASE loHttp RELEASE loSbPubKeys RELEASE loJwt RELEASE loJson RELEASE loJsonPubKeys CANCEL ENDIF ? loJsonKey.Emit() * Load the matching public key into a Chilkat public key object. loPubKey = CreateObject('Chilkat_9_5_0.PublicKey') lnSuccess = loPubKey.LoadFromString(loJsonKey.Emit()) RELEASE loJsonKey IF (lnSuccess = 0) THEN ? loPubKey.LastErrorText RELEASE loHttp RELEASE loSbPubKeys RELEASE loJwt RELEASE loJson RELEASE loJsonPubKeys RELEASE loPubKey CANCEL ENDIF * ---------------------------------------------------------------------------------------- * Now we can validate the JWT using Google's public key as shown in this example: * (Except we use the public key obtained as shown above instead of a public key loaded from a PEM file. * * See Verify JWT Using an RSA Public Key RELEASE loHttp RELEASE loSbPubKeys RELEASE loJwt RELEASE loJson RELEASE loJsonPubKeys RELEASE loPubKey |
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