public GcmAuthenticatedEncryptor(Secret keyDerivationKey, BCryptAlgorithmHandle symmetricAlgorithmHandle, uint symmetricAlgorithmKeySizeInBytes, IBCryptGenRandom genRandom = null)
{
// Is the key size appropriate?
AlgorithmAssert.IsAllowableSymmetricAlgorithmKeySize(checked(symmetricAlgorithmKeySizeInBytes * 8));
CryptoUtil.Assert(symmetricAlgorithmHandle.GetCipherBlockLength() == 128 / 8, "GCM requires a block cipher algorithm with a 128-bit block size.");
_genRandom = genRandom ?? BCryptGenRandomImpl.Instance;
_sp800_108_ctr_hmac_provider = SP800_108_CTR_HMACSHA512Util.CreateProvider(keyDerivationKey);
_symmetricAlgorithmHandle = symmetricAlgorithmHandle;
_symmetricAlgorithmSubkeyLengthInBytes = symmetricAlgorithmKeySizeInBytes;
_contextHeader = CreateContextHeader();
}
public CbcAuthenticatedEncryptor(Secret keyDerivationKey, BCryptAlgorithmHandle symmetricAlgorithmHandle, uint symmetricAlgorithmKeySizeInBytes, BCryptAlgorithmHandle hmacAlgorithmHandle, IBCryptGenRandom genRandom = null)
{
_genRandom = genRandom ?? BCryptGenRandomImpl.Instance;
_sp800_108_ctr_hmac_provider = SP800_108_CTR_HMACSHA512Util.CreateProvider(keyDerivationKey);
_symmetricAlgorithmHandle = symmetricAlgorithmHandle;
_symmetricAlgorithmBlockSizeInBytes = symmetricAlgorithmHandle.GetCipherBlockLength();
_symmetricAlgorithmSubkeyLengthInBytes = symmetricAlgorithmKeySizeInBytes;
_hmacAlgorithmHandle = hmacAlgorithmHandle;
_hmacAlgorithmDigestLengthInBytes = hmacAlgorithmHandle.GetHashDigestLength();
_hmacAlgorithmSubkeyLengthInBytes = _hmacAlgorithmDigestLengthInBytes; // for simplicity we'll generate HMAC subkeys with a length equal to the digest length
// Argument checking on the algorithms and lengths passed in to us
AlgorithmAssert.IsAllowableSymmetricAlgorithmBlockSize(checked(_symmetricAlgorithmBlockSizeInBytes * 8));
AlgorithmAssert.IsAllowableSymmetricAlgorithmKeySize(checked(_symmetricAlgorithmSubkeyLengthInBytes * 8));
AlgorithmAssert.IsAllowableValidationAlgorithmDigestSize(checked(_hmacAlgorithmDigestLengthInBytes * 8));
_contextHeader = CreateContextHeader();
}