As described on GetSystemUrl you can use a few predefined methods exposed on SysSingleton.

These method are implemented in Turnkey to allow for common things without the need to use CodeDress (that will work around anything)

BitConverterToString(bytes:Blob):String - given a byte array will return string like 01-A0-FF... for the bytes

SHA512ComputeHash(bytes:Blob):Blob - given a byte array will return SHA512 checksum in bytes

SHA256ComputeHash(bytes:Blob):Blob - given a byte array will return SHA256 checksum in bytes