internal virtual EncryptionAlgorithm GetEncryptionAlgorithm(byte[] rawDek, CosmosEncryptionAlgorithm encryptionAlgorithmId)
{
Debug.Assert(encryptionAlgorithmId == CosmosEncryptionAlgorithm.AE_AES_256_CBC_HMAC_SHA_256_RANDOMIZED, "Unexpected encryption algorithm id");
AeadAes256CbcHmac256EncryptionKey key = new AeadAes256CbcHmac256EncryptionKey(rawDek, AeadAes256CbcHmac256Algorithm.AlgorithmNameConstant);
return(new AeadAes256CbcHmac256Algorithm(key, EncryptionType.Randomized, algorithmVersion: 1));
}
/// <summary>
/// Initializes a new instance of AeadAes256CbcHmac256Algorithm algorithm with a given key and encryption type
/// </summary>
/// <param name="encryptionKey">
/// Root encryption key from which three other keys will be derived
/// </param>
/// <param name="encryptionType">Encryption Type, accepted values are Deterministic and Randomized.
/// For Deterministic encryption, a synthetic IV will be genenrated during encryption
/// For Randomized encryption, a random IV will be generated during encryption.
/// </param>
/// <param name="algorithmVersion">
/// Algorithm version
/// </param>
internal AeadAes256CbcHmac256Algorithm(AeadAes256CbcHmac256EncryptionKey encryptionKey, EncryptionType encryptionType, byte algorithmVersion)
{
this.dataEncryptionKey = encryptionKey;
this.algorithmVersion = algorithmVersion;
version[0] = algorithmVersion;
Debug.Assert(encryptionKey != null, "Null encryption key detected in AeadAes256CbcHmac256 algorithm");
Debug.Assert(algorithmVersion == 0x01, "Unknown algorithm version passed to AeadAes256CbcHmac256");
// Validate encryption type for this algorithm
// This algorithm can only provide randomized or deterministic encryption types.
// Right now, we support only randomized encryption for Cosmos DB client side encryption.
Debug.Assert(encryptionType == EncryptionType.Randomized, "Invalid Encryption Type detected in AeadAes256CbcHmac256Algorithm");
this.isDeterministic = false;
this.cryptoProviderPool = new ConcurrentQueue <AesCryptoServiceProvider>();
}
