code: public ServiceFuture<KeyOperationResult> unwrapKeyAsync(String vaultBaseUrl, String keyName, String keyVersion, JsonWebKeyEncryptionAlgorithm algorithm, byte[] value, final ServiceCallback<KeyOperationResult> serviceCallback) {
          return ServiceFuture.fromResponse(unwrapKeyWithServiceResponseAsync(vaultBaseUrl, keyName, keyVersion, algorithm, value), serviceCallback);
      }
docs: Unwraps a symmetric key using the specified key that was initially used for wrapping that key.
  The UNWRAP operation supports decryption of a symmetric key using the target key encryption key. This operation is the reverse of the WRAP operation. The UNWRAP operation applies to asymmetric and symmetric keys stored in Azure Key Vault since it uses the private portion of the key. This operation requires the keys/unwrapKey permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param keyName The name of the key.
  @param keyVersion The version of the key.
  @param algorithm algorithm identifier. Possible values include: 'RSA-OAEP', 'RSA-OAEP-256', 'RSA1_5'
  @param value the Base64Url value
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object