This EncryptDecrypt Service is a DataPower service which may be used as a microservice to solely encrypt and decrypt a plain text input.
The tutorial may be found here: https://developer.ibm.com/recipes/tutorials/ibm-datapower-encryption-and-decryption-multiprotocol-gateway-service/
Note: The Decrypt.xsl, Encrypt.xsl, and EncryptDecrypt_OpenSSL_Key.key are not required, they will will be found in the EncryptDecrypt_MPGW.zip.