Class au.net.aba.security.DigestOutputStream
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Class au.net.aba.security.DigestOutputStream
java.lang.Object
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+----java.io.OutputStream
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+----java.io.FilterOutputStream
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+----au.net.aba.security.DigestOutputStream
- public class DigestOutputStream
- extends FilterOutputStream
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 output stream's write methods.
It is possible to turn this stream on or off (see on). When it
is on, a call to write 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.
- See Also:
- MessageDigest, DigestInputStream
-
digest
- The message digest associated with this stream.
-
ident
-
-
DigestOutputStream(OutputStream, MessageDigest)
- Creates a digest output stream, using the specified output
stream and message digest.
-
getMessageDigest()
- Returns the message digest associated with this stream.
-
on(boolean)
- Turns the digest function on or off.
-
setMessageDigest(MessageDigest)
- Associates the specified message digest with this stream.
-
toString()
- Prints a string representation of this digest output stream and
its associated message digest object.
-
write(byte[], int, int)
- Updates the message digest (if the digest function is on) using
the specified subarray, and in any case writes the subarray to
the output stream.
-
write(int)
- Updates the message digest (if the digest function is on) using
the specified byte, and in any case writes the byte to the
output stream.
ident
public final static String ident
digest
protected MessageDigest digest
- The message digest associated with this stream.
DigestOutputStream
public DigestOutputStream(OutputStream stream,
MessageDigest digest)
- Creates a digest output stream, using the specified output
stream and message digest.
- Parameters:
- stream - - the output stream.
- digest - - the message digest to associate with this stream.
getMessageDigest
public MessageDigest getMessageDigest()
- Returns the message digest associated with this stream.
- Returns:
- the message digest associated with this stream.
setMessageDigest
public void setMessageDigest(MessageDigest digest)
- Associates the specified message digest with this stream.
- Parameters:
- digest - - the message digest to be associated with this
stream.
write
public void write(int b) throws IOException
- Updates the message digest (if the digest function is on) using
the specified byte, and in any case writes the byte to the
output stream. That is, if the digest function is on (see on),
this method calls update on the message digest associated with
this stream, passing it the byte b. This method then writes the
byte to the output stream, blocking until the byte is actually
written.
- Parameters:
- b - - the byte to be used for updating and writing to the
output stream.
- Throws: IOException
- if an I/O error occurs.
- Overrides:
- write in class FilterOutputStream
- See Also:
- update
write
public void write(byte b[],
int off,
int len) throws IOException
- Updates the message digest (if the digest function is on) using
the specified subarray, and in any case writes the subarray to
the output stream. That is, if the digest function is on (see
on), this method calls update on the message digest associated
with this stream, passing it the subarray specifications. This
method then writes the subarray bytes to the output stream,
blocking until the bytes are actually written.
b - the array containing the subarray to be used for updating
and writing to the output stream.
off - the offset into b of the first byte to be updated and written.
len - the number of bytes of data to be updated and written from
b, starting at offset off.
- Overrides:
- write in class FilterOutputStream
- See Also:
- update
on
public void on(boolean on)
- Turns the digest function on or off. The default is on. When it
is on, a call to write results in an update on the message
digest. But when it is off, the message digest is not updated.
- Parameters:
- on - - true to turn the digest function on, false to turn
it off.
toString
public String toString()
- Prints a string representation of this digest output stream and
its associated message digest object.
- Overrides:
- toString in class Object
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