A transparent stream that updates the associated message digest using the bits going through the stream.
To complete the message digest computation, call one of the
digest methods on the associated message
digest after your calls to one of this digest input stream's
read methods.
It is possible to turn this stream on or off (see
on). When it is on, a call to one of the
read methods
results in an update on the message digest. But when it is off,
the message digest is not updated. The default is for the stream
to be on.
Note that digest objects can compute only one digest (see
MessageDigest),
so that in order to compute intermediate digests, a caller should
retain a handle onto the digest object, and clone it for each
digest to be computed, leaving the original digest untouched.
extends
MessageDigest, DigestOutputStream