com.sibvisions.util
Class SecureHash

java.lang.Object
  com.sibvisions.util.SecureHash

public class SecureHash
extends Object

The SecureHash class provides the functionality of a message digest algorithm, such as MD5 or SHA. Message digests are secure one-way hash functions that take arbitrary-sized data and output a fixed-length hash value.

See Also:

MessageDigest

Field Summary

static String	MD2 the MD2 hash algorithm.
static String	MD4 the MD4 hash algorithm.
static String	MD5 the MD5 hash algorithm.
static String	SHA the SHA hash algorithm.
static String	SHA_256 the SHA-256 hash algorithm.
static String	SHA_384 the SHA-384 hash algorithm.
static String	SHA_512 the SHA-512 hash algorithm.

Constructor Summary

SecureHash(String pAlgorithm)
Creates a new instance of SecureHash for a specific hash algorithm.

Method Summary

void	add(byte[] pData) Adds data to the digest.
void	add(InputStream pData) Adds data to the digest.
String	getHash() Gets the current hash.
static String	getHash(String pAlgorithm, byte[] pData) Gets the hash of specific data.
static String	getHash(String pAlgorithm, InputStream pData) Gets the hash of all content read from an InputStream.
byte[]	getRawHash() Gets the current raw hash.
static byte[]	getRawHash(String pAlgorithm, byte[] pData) Gets the raw hash of specific data.
static byte[]	getRawHash(String pAlgorithm, InputStream pData) Gets the raw hash of all content read from an InputStream.
void	reset() Resets the digest.

Methods inherited from class java.lang.Object

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

Field Detail

MD2

public static final String MD2

the MD2 hash algorithm.

See Also:

Constant Field Values

MD4

public static final String MD4

the MD4 hash algorithm.

See Also:

Constant Field Values

MD5

public static final String MD5

the MD5 hash algorithm.

See Also:

Constant Field Values

SHA

public static final String SHA

the SHA hash algorithm.

See Also:

Constant Field Values

SHA_256

public static final String SHA_256

the SHA-256 hash algorithm.

See Also:

Constant Field Values

SHA_384

public static final String SHA_384

the SHA-384 hash algorithm.

See Also:

Constant Field Values

SHA_512

public static final String SHA_512

the SHA-512 hash algorithm.

See Also:

Constant Field Values

Constructor Detail

SecureHash

public SecureHash(String pAlgorithm)

Creates a new instance of SecureHash for a specific hash algorithm.

Parameters:

pAlgorithm - the hash algorithm MD5 SHA

Method Detail

getHash

public static String getHash(String pAlgorithm,
                             InputStream pData)
                      throws NoSuchAlgorithmException,
                             IOException

Gets the hash of all content read from an InputStream.

Parameters:

pAlgorithm - the hash algorithm

pData - the data stream

Returns:

the hash

Throws:

NoSuchAlgorithmException - specified algorithm is not available

IOException - if an error occurs during reading from the stream

getRawHash

public static byte[] getRawHash(String pAlgorithm,
                                InputStream pData)
                         throws NoSuchAlgorithmException,
                                IOException

Gets the raw hash of all content read from an InputStream.

Parameters:

pAlgorithm - the hash algorithm

pData - the data stream

Returns:

the raw hash

Throws:

NoSuchAlgorithmException - specified algorithm is not available

IOException - if an error occurs during reading from the stream

getHash

public static String getHash(String pAlgorithm,
                             byte[] pData)
                      throws NoSuchAlgorithmException

Gets the hash of specific data.

Parameters:

pAlgorithm - the hash algorithm

pData - the data

Returns:

the hash

Throws:

NoSuchAlgorithmException - specified algorithm is not available

getRawHash

public static byte[] getRawHash(String pAlgorithm,
                                byte[] pData)
                         throws NoSuchAlgorithmException

Gets the raw hash of specific data.

Parameters:

pAlgorithm - the hash algorithm

pData - the data

Returns:

the raw hash

Throws:

NoSuchAlgorithmException - specified algorithm is not available

add

public void add(InputStream pData)
         throws NoSuchAlgorithmException,
                IOException

Adds data to the digest.

Parameters:

pData - the data stream

Throws:

NoSuchAlgorithmException

NoSuchAlgorithmException - specified algorithm is not available

IOException - if an error occurs during reading from the stream

add

public void add(byte[] pData)
         throws NoSuchAlgorithmException

Adds data to the digest.

Parameters:

pData - the data

Throws:

NoSuchAlgorithmException - specified algorithm is not available

reset

public void reset()

Resets the digest.

getHash

public String getHash()

Gets the current hash.

Returns:

the hash for the current data

getRawHash

public byte[] getRawHash()

Gets the current raw hash.

Returns:

the raw hash for the current data