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java.lang.Objectjava.io.InputStream
java.io.FilterInputStream
com.Ostermiller.util.MD5InputStream
public class MD5InputStream
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.
MD5
,
MD5OutputStream
Field Summary |
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Fields inherited from class java.io.FilterInputStream |
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in |
Constructor Summary | |
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MD5InputStream(java.io.InputStream in)
Creates a MD5InputStream |
Method Summary | |
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byte[] |
getHash()
Returns array of bytes representing hash of the stream so far. |
java.lang.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. |
Methods inherited from class java.io.FilterInputStream |
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available, close, mark, markSupported, read, reset, skip |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MD5InputStream(java.io.InputStream in)
in
- the underlying input streamMethod Detail |
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public int read() throws java.io.IOException
This method simply performs in.read() and returns the result.
read
in class java.io.FilterInputStream
java.io.IOException
- if an I/O error occurs.public int read(byte[] bytes, int offset, int length) throws java.io.IOException
read
in class java.io.FilterInputStream
bytes
- the buffer into which the data is read.offset
- the start offset of the data.length
- the maximum number of bytes read.
java.io.IOException
- if an I/O error occurs.public byte[] getHash()
public java.lang.String getHashString()
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