base64Encode -- takes an unencoded string, encodes it and returns the encoded value as type string
base64Decode -- takes an encoded value as a string, decodes it and returns the decoded value as type string
convertToHex -- takes a string representing binary and returns a string representing hex
convertToBytes -- takes a string representing hex and returns a string representing binary
xor -- takes a key, value pair and does an xor operation, returing the result as a string