com.ds.common.md5

类 MD5InputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

com.ds.common.md5.MD5InputStream

所有已实现的接口:

Closeable, AutoCloseable

public class MD5InputStream
extends FilterInputStream

Implements MD5 functionality on a stream. More information about this class is available from ostermiller.org.

This class produces a 128-bit "fingerprint" or "message digest" for all data read from this stream. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given pre-specified target message digest. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA.

For more information see RFC1321.

从以下版本开始:

ostermillerutils 1.00.00

作者:

Santeri Paavolainen http://santtu.iki.fi/md5/, Stephen Ostermiller http://ostermiller.org/contact.pl?regarding=Java+Utilities

另请参阅:

MD5, MD5OutputStream

字段概要

从类继承的字段 java.io.FilterInputStream

in

构造器概要

构造器

构造器和说明
MD5InputStream(InputStream in) Creates a MD5InputStream

方法概要

限定符和类型	方法和说明
byte[]	getHash() Returns array of bytes representing hash of the stream so far.
String	getHashString() Get a 32-character hex representation representing hash of the stream so far.
int	read() Reads the next byte of data from this input stream.
int	read(byte[] bytes, int offset, int length) Reads up to length bytes of data from this input stream into an array of bytes.

从类继承的方法 java.io.FilterInputStream

available, close, mark, markSupported, read, reset, skip

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

MD5InputStream

public MD5InputStream(InputStream in)

Creates a MD5InputStream

参数:

in - the underlying input stream

方法详细资料

read

public int read()
         throws IOException

Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

This method simply performs in.read() and returns the result.

覆盖:

read 在类中 FilterInputStream

返回:

the next byte of data, or -1 if the end of the stream is reached.

抛出:

IOException - if an I/O error occurs.

从以下版本开始:

ostermillerutils 1.00.00

read

public int read(byte[] bytes,
                int offset,
                int length)
         throws IOException

Reads up to length bytes of data from this input stream into an array of bytes. This method blocks until some input is available.

覆盖:

read 在类中 FilterInputStream

参数:

bytes - the buffer into which the data is read.

offset - the start offset of the data.

length - the maximum number of bytes read.

抛出:

IOException - if an I/O error occurs.

从以下版本开始:

ostermillerutils 1.00.00

getHash

public byte[] getHash()

Returns array of bytes representing hash of the stream so far.

返回:

Array of 16 bytes, the hash of all read bytes.

从以下版本开始:

ostermillerutils 1.00.00

getHashString

public String getHashString()

Get a 32-character hex representation representing hash of the stream so far.

返回:

A string containing the hash of all written bytes.

从以下版本开始:

ostermillerutils 1.00.00