private static byte[] PRF_legacy(TlsKdfParameters parameters, int size, IMac md5Hmac, IMac sha1HMac)
{
byte[] label = Strings.ToByteArray(parameters.Label);
byte[] labelSeed = Arrays.Concatenate(label, parameters.SeedMaterial);
byte[] secret = parameters.Secret;
int s_half = (secret.Length + 1) / 2;
byte[] s1 = new byte[s_half];
byte[] s2 = new byte[s_half];
Array.Copy(secret, 0, s1, 0, s_half);
Array.Copy(secret, secret.Length - s_half, s2, 0, s_half);
byte[] b1 = new byte[size];
byte[] b2 = new byte[size];
hmac_hash(md5Hmac, s1, labelSeed, b1);
hmac_hash(sha1HMac, s2, labelSeed, b2);
for (int i = 0; i < size; i++)
{
b1[i] ^= b2[i];
}
return(b1);
}
public IKdfCalculator <TlsKdfParameters> From(byte[] secret, string label, params byte[][] seedMaterial)
{
TlsKdfParameters parameters = new TlsKdfParameters(algorithm, Arrays.Clone(secret), label, concatenate(seedMaterial));
return(new Tls10and11KdfFactory(parameters));
}