Visual Basic 6.0 Requires Chilkat v11.0.0+

Download Google OAuth2 Certs (JWK) and Load into Chilkat PublicKey Objects

See more OAuth2 Examples

Demonstrates how to download the JWK from https://www.googleapis.com/oauth2/v3/certs and load the public keys into Chilkat public key objects. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim http As New ChilkatHttp

Dim jwkStr As String
jwkStr = http.QuickGetStr("https://www.googleapis.com/oauth2/v3/certs")
If (http.LastMethodSuccess = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

'  We have the following:

'      {
'        "keys": [
'  	{
'  	  "kid": "e8732db06287515556213b80acbcfd08cfb302a9",
'  	  "n": "4RIrO30287Wsq3gqXCMkUYMVAeI3H8...w2mbMNEBQ",
'  	  "kty": "RSA",
'  	  "e": "AQAB",
'  	  "alg": "RS256",
'  	  "use": "sig"
'  	},
'  	{
'  	  "kid": "8462a71da4f6d611fc0fecf0fc4ba9c37d65e6cd",
'  	  "e": "AQAB",
'  	  "n": "xT_ngLZNmT5GBtJZeTB...Ft4gK0eoFi0d3l8bcw",
'  	  "alg": "RS256",
'  	  "use": "sig",
'  	  "kty": "RSA"
'  	}
'        ]
'      }

Dim json As New ChilkatJsonObject
success = json.Load(jwkStr)

Dim jsonKey As New ChilkatJsonObject
Dim pubKey As New PublicKey
Dim numKeys As Long
numKeys = json.SizeOfArray("keys")
Dim i As Long
i = 0
Do While i < numKeys
    json.I = i

    success = json.ObjectOf2("keys[i]",jsonKey)

    success = pubKey.LoadFromString(jsonKey.Emit())
    If (success = 0) Then
        Debug.Print pubKey.LastErrorText
        Exit Sub
    End If

    Debug.Print i
    Debug.Print pubKey.GetPem(1)
    i = i + 1
Loop

Debug.Print "Success."

'  Sample output:

'  0
'  -----BEGIN RSA PUBLIC KEY-----
'  MIIBCgKCAQEA4RIrO30287Wsq3gqXCMkUYMVAeI3H8LVE6IXR1krdFeGnZLiGUPw
'  cbkeVpXf3lmJdsStOg+jijces2DZCfPyIBiQuLYfxxmAZE6ErJ0QJFg1stwli2Pz
'  9ncYhFoqi8pXr7kEzEJBTzX4thuw56ydbGsshSEznPXoerCJOc7UI2+n0wFCWQ4Y
'  LHbh/PrWt4vdadyUUUW/QpQHXQLdD8q/Qwqdj0O9zlJE7R6Elw2E9EqnHyIGu1hm
'  LxhqrTru1M18SUhONYbVskV/BCEdVKs//X96849HorWQDCAgVMWfGsdMVq55FAdJ
'  680N5UmQDRynIZ4+PeNGN4S9iw2mbMNEBQIDAQAB
'  -----END RSA PUBLIC KEY-----
'  
'  1
'  -----BEGIN RSA PUBLIC KEY-----
'  MIIBCgKCAQEAxT/ngLZNmT5GBdkLtJZjNeTB+8B5yWgrq/e5eMZ1hrZhcmLK+dSn
'  IkpOPV8/OekV67EnQ7I4II2rcNJnHGrGKZziXO3XN2gtUHE+mBJC99oULSbX/QwB
'  Kz7gC/IBPq9EuxTt6Oq6fPkVQ9DbRIgWJSEGBF/KRaNl3kyAlIZfpY7XgHyJTTv8
'  E7yAcYKPR+36gzdl+ps0sDLKzUuAtZNq8llK0u80z6AtAUIYwWdkEhM9upy6keKI
'  TasIxcsO7M6kZPINUSbh6t5VAm8FuqRmxpgg+9c9/GQSGd89InVypoVzWLQ+wOGg
'  5G4H6JqIgtj0TRFt4gK0eoFi2U0d3l8bcwIDAQAB
'  -----END RSA PUBLIC KEY-----
'  
'  Success.