System.NullReferenceException PrivateKeyFactory

[FeyverkSoft]

Hi Cheng.

            var p = new ApplePayParameters
            {
                PrivateKey = "MIIEvQIBADANBgkqhkiG9w........=",
                EphemeralPublicKey = "MFkwEwYHKoZI.......==",
                MerchantIdentifier = "me...."
            };
            ApplePayTokenDecrypter d = new ApplePayTokenDecrypter();
            d.Init(p);
           var res = d.Decrypt("Q8JclPEJp....ZGYl","");

The Decryption method throws an exception on the call
PrivateKeyParameters = CreatePrivateKeyParameters ();
In the line
Return (ECPrivateKeyParameters) PrivateKeyFactory.CreateKey (privInfo);
Because of what this can be?

[chengbo]

Probably because you chose a wrong private key. Please get private key with steps described in README and try again.

[FeyverkSoft]

I have key for working with EC_v1. Need some other?
openssl pkcs12 -in PrivateKey.p12 -nodes -out PrivateKey.pem
cat PrivateKey.pem
return

 -----BEGIN EC PRIVATE KEY-----
MIIEvQIBADANBgkqhkiG9w
{Private-Key}
-----END EC PRIVATE KEY-----

It seemed strange to me..... 😕
I have only these keys and csr.
request_applepay.csr
apple_pay.cer
B217ACA5C9CC601.p12

[bdavi19]

@FeyverkSoft Were you able to get this working for you? I've hit the same snag.

[graham-w2]

I had this problem except my private key file looked slightly different (notice no "EC" in the BEGIN tag)

-----BEGIN PRIVATE KEY-----
MIGHAgEAMBMGByqGSM ... {etc}
-----END PRIVATE KEY-----

I then ran "openssl ec -in privatekeyonly.pem -out tradfile.pem" to output the key in "traditional" format on a file containing just that private key with the output looking like this

-----BEGIN EC PRIVATE KEY-----
MHcCAQEEILc/zZdDHbmM ... {etc}
-----END EC PRIVATE KEY-----

Using this version of the private key the CreateKey method did not throw the exception and the decryption I was trying worked.