java.lang.Object
|
+----java.io.InputStream
|
+----java.io.FilterInputStream
|
+----java.security.DigestInputStream
public class DigestInputStream
extends FilterInputStream
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 read 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 orginal digest untouched.