# Io Reference

Digests / MD5 / MD5

|  | An object for calculating MD5 hashes. Each hash calculation should instantiate its own MD5 instance. Example:
    digest := MD5 clone
    digest appendSeq("this is a message")
    out := digest md5String
|  | appendSeq(aSequence) Appends aSequence to the hash calculation. Returns self. md5 Completes the MD5 calculation and returns the hash as a Buffer. Once this method is called, append() should not be called again on the receiver or it will raise an exception. md5String Returns a string containing a hexadecimal representation of the md5 hash.