code: public KeyOperationResult wrapKey(String vaultBaseUrl, String keyName, String keyVersion, JsonWebKeyEncryptionAlgorithm algorithm, byte[] value) {
          return wrapKeyWithServiceResponseAsync(vaultBaseUrl, keyName, keyVersion, algorithm, value).toBlocking().single().body();
      }
docs: Wraps a symmetric key using a specified key.
  The WRAP operation supports encryption of a symmetric key using a key encryption key that has previously been stored in an Azure Key Vault. The WRAP operation is only strictly necessary for symmetric keys stored in Azure Key Vault since protection with an asymmetric key can be performed using the public portion of the key. This operation is supported for asymmetric keys as a convenience for callers that have a key-reference but do not have access to the public key material. This operation requires the keys/wrapKey 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
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws KeyVaultErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the KeyOperationResult object if successful.