public override byte[] WrapKey(string encryptionKeyId, Data.Encryption.Cryptography.KeyEncryptionKeyAlgorithm algorithm, byte[] key)
{
return(this.encryptionKeyWrapProvider.WrapKeyAsync(encryptionKeyId, algorithm.ToString(), key)
.ConfigureAwait(false)
.GetAwaiter()
.GetResult());
}
/// <summary>
/// This function uses the asymmetric key specified by the key path
/// and encrypts an unencrypted data encryption key with RSA encryption algorithm.
/// </summary>
/// <param name="encryptionKeyId">Identifier of an asymmetric key in Azure Key Vault. </param>
/// <param name="cosmosKeyEncryptionKeyAlgorithm">The key encryption algorithm.</param>
/// <param name="key">The plaintext key.</param>
/// <returns>Encrypted data encryption key. </returns>
public override Task <byte[]> WrapKeyAsync(string encryptionKeyId, string cosmosKeyEncryptionKeyAlgorithm, byte[] key)
{
Data.Encryption.Cryptography.KeyEncryptionKeyAlgorithm keyEncryptionKeyAlgorithm = cosmosKeyEncryptionKeyAlgorithm switch
{
KeyEncryptionKeyAlgorithm.RsaOaep => Data.Encryption.Cryptography.KeyEncryptionKeyAlgorithm.RSA_OAEP,
_ => throw new NotSupportedException("This specified KeyEncryptionAlgorithm is not supported. Please refer to https://aka.ms/CosmosClientEncryption for more details. "),
};
return(Task.FromResult(this.azureKeyVaultKeyStoreProvider.WrapKey(encryptionKeyId, keyEncryptionKeyAlgorithm, key)));
}
public override byte[] UnwrapKey(string encryptionKeyId, Data.Encryption.Cryptography.KeyEncryptionKeyAlgorithm algorithm, byte[] encryptedKey)
{
// since we do not expose GetOrCreateDataEncryptionKey we first look up the cache.
// Cache miss results in call to UnWrapCore which updates the cache after UnwrapKeyAsync is called.
return(this.GetOrCreateDataEncryptionKey(encryptedKey.ToHexString(), UnWrapKeyCore));
// delegate that is called by GetOrCreateDataEncryptionKey, which unwraps the key and updates the cache in case of cache miss.
byte[] UnWrapKeyCore()
{
return(this.encryptionKeyWrapProvider.UnwrapKeyAsync(encryptionKeyId, algorithm.ToString(), encryptedKey)
.ConfigureAwait(false)
.GetAwaiter()
.GetResult());
}
}
