public static void Equivalence_Hmac(HashAlgorithmName algorithm, bool useSecretAgreementAsHmac, bool prepend, bool append)
{
using (ECDiffieHellmanCng ecdh = NewDefaultECDHCng())
using (ECDiffieHellmanPublicKey publicKey = ecdh.PublicKey)
{
byte[] secretPrepend = prepend ? new byte[3] : null;
byte[] secretAppend = append ? new byte[4] : null;
byte[] hmacKey = useSecretAgreementAsHmac ? null : new byte[12];
byte[] newWay = ecdh.DeriveKeyFromHmac(publicKey, algorithm, hmacKey, secretPrepend, secretAppend);
ecdh.HashAlgorithm = new CngAlgorithm(algorithm.Name);
ecdh.HmacKey = hmacKey;
ecdh.SecretPrepend = secretPrepend;
ecdh.SecretAppend = secretAppend;
ecdh.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hmac;
byte[] oldWay = ecdh.DeriveKeyMaterial(publicKey);
Assert.Equal(newWay, oldWay);
}
}