com.googlecode.jinahya.security

Class MessageDigests

java.lang.Object

com.googlecode.jinahya.security.MessageDigests

public class MessageDigests
extends Object

a utility class for MessageDigests.

Author:

Jin Kwon

Field Summary

Fields

Modifier and Type	Field and Description
static List<String>	SUPPORTED_ALGORITHMS Algorithms that every implementation of the Java platform is required to support.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MessageDigests() Creates a new instance.

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	digest(MessageDigest digest, File input, byte[] buffer, long length) Digests on given digest with bytes read from given input file using specified buffer.
static byte[]	digest(MessageDigest digest, File input, ByteBuffer buffer, long length) Digests on given digest with bytes read from given input file using specified buffer.
static byte[]	digest(MessageDigest digest, InputStream input, byte[] buffer, long length) Digests on given digest with bytes read from given input stream using specified buffer.
static long	digest(MessageDigest digest, InputStream input, OutputStream output, byte[] buffer, long length) Digests on given digest with bytes read from given input stream and writes the result to given output stream.
static byte[]	digest(MessageDigest digest, ReadableByteChannel input, ByteBuffer buffer, long length) Digests on give digest with bytes read from given input channel using specified buffer.
static long	digest(MessageDigest digest, ReadableByteChannel input, WritableByteChannel output, ByteBuffer buffer, long length) Digests on give digest with bytes read from given input channel and writes the result to given output channel.

Methods inherited from class java.lang.Object

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

Field Detail

SUPPORTED_ALGORITHMS

public static final List<String> SUPPORTED_ALGORITHMS

Algorithms that every implementation of the Java platform is required to support.

Constructor Detail

MessageDigests

protected MessageDigests()

Creates a new instance.

Method Detail

digest

public static byte[] digest(MessageDigest digest,
            InputStream input,
            byte[] buffer,
            long length)
                     throws IOException

Digests on given digest with bytes read from given input stream using specified buffer.

Parameters:

digest - the digest

input - the input stream

buffer - the buffer.

length - the maximum number of bytes to digest; any negative value for all available bytes.

Returns:

digest result

Throws:

IOException - if an I/O error occurs

digest

public static byte[] digest(MessageDigest digest,
            File input,
            byte[] buffer,
            long length)
                     throws IOException

Digests on given digest with bytes read from given input file using specified buffer.

Parameters:

digest - the digest

input - the input file

buffer - the buffer.

length - the maximum number of byte to digest; any negative for all available bytes.

Returns:

digest result

Throws:

IOException - if an I/O error occurs

See Also:

digest(MessageDigest, InputStream, byte[], long)

digest

public static byte[] digest(MessageDigest digest,
            ReadableByteChannel input,
            ByteBuffer buffer,
            long length)
                     throws IOException

Digests on give digest with bytes read from given input channel using specified buffer.

Parameters:

digest - the digest

input - the input channel

buffer - the buffer.

length - the maximum number of byte to digest; any negative for all available bytes.

Returns:

digest result

Throws:

IOException - if an I/O error occurs

digest

public static byte[] digest(MessageDigest digest,
            File input,
            ByteBuffer buffer,
            long length)
                     throws IOException

Digests on given digest with bytes read from given input file using specified buffer.

Parameters:

digest - the digest

input - the input file

buffer - the buffer.

length - the maximum number of byte to digest; any negative for all available bytes.

Returns:

digest result

Throws:

IOException - if an I/O error occurs; or length is not #ALL and reached to EOF before processing specified number of bytes.

digest

public static long digest(MessageDigest digest,
          InputStream input,
          OutputStream output,
          byte[] buffer,
          long length)
                   throws IOException

Digests on given digest with bytes read from given input stream and writes the result to given output stream.

Parameters:

digest - the digest

input - the input stream

output - the output stream

buffer - the buffer.

length - the maximum number of bytes to digest; any negative value for all available bytes.

Returns:

the actual number of bytes digested

Throws:

IOException - if an I/O error occurs

digest

public static long digest(MessageDigest digest,
          ReadableByteChannel input,
          WritableByteChannel output,
          ByteBuffer buffer,
          long length)
                   throws IOException

Digests on give digest with bytes read from given input channel and writes the result to given output channel.

Parameters:

digest - the digest

input - the input channel

output - the output channel

buffer - the buffer.

length - the maximum number of byte to digest; any negative for all available bytes.

Returns:

the actual number of bytes digested

Throws:

IOException - if an I/O error occurs