public HMacSP800Drbg(IMac hMac, int securityStrength, IEntropySource entropySource, byte[] personalizationString, byte[] nonce)
{
if (securityStrength > DrbgUtilities.GetMaxSecurityStrength(hMac))
{
throw new ArgumentException("Requested security strength is not supported by the derivation function");
}
if (entropySource.EntropySize < securityStrength)
{
throw new ArgumentException("Not enough entropy for security strength required");
}
mHMac = hMac;
mSecurityStrength = securityStrength;
mEntropySource = entropySource;
byte[] entropy = GetEntropy();
byte[] seedMaterial = Arrays.ConcatenateAll(entropy, nonce, personalizationString);
mK = new byte[hMac.GetMacSize()];
mV = new byte[mK.Length];
Arrays.Fill(mV, 1);
hmac_DRBG_Update(seedMaterial);
mReseedCounter = 1L;
}
public HashSP800Drbg(IDigest digest, int securityStrength, IEntropySource entropySource, byte[] personalizationString, byte[] nonce)
{
if (securityStrength > DrbgUtilities.GetMaxSecurityStrength(digest))
{
throw new ArgumentException("Requested security strength is not supported by the derivation function");
}
if (entropySource.EntropySize < securityStrength)
{
throw new ArgumentException("Not enough entropy for security strength required");
}
mDigest = digest;
mEntropySource = entropySource;
mSecurityStrength = securityStrength;
mSeedLength = (int)seedlens[digest.AlgorithmName];
byte[] entropy = GetEntropy();
byte[] seedMaterial = Arrays.ConcatenateAll(entropy, nonce, personalizationString);
byte[] array = mV = DrbgUtilities.HashDF(mDigest, seedMaterial, mSeedLength);
byte[] array2 = new byte[mV.Length + 1];
Array.Copy(mV, 0, array2, 1, mV.Length);
mC = DrbgUtilities.HashDF(mDigest, array2, mSeedLength);
mReseedCounter = 1L;
}
