gov.sandia.cognition.hash

Class SHA1Hash

java.lang.Object

gov.sandia.cognition.util.AbstractCloneableSerializable

gov.sandia.cognition.hash.AbstractHashFunction

gov.sandia.cognition.hash.SHA1Hash

All Implemented Interfaces:

Evaluator<byte[],byte[]>, HashFunction, CloneableSerializable, java.io.Serializable, java.lang.Cloneable

@PublicationReference(author="Wikipedia",title="SHA-1",type=WebPage,year=2011,url="http://en.wikipedia.org/wiki/SHA-1") @PublicationReference(author="Sam Ruby",title="SHA1.java",type=WebPage,year=2004,url="http://intertwingly.net/stories/2004/07/18/SHA1.java")
public class SHA1Hash
extends AbstractHashFunction

A Java implementation of the Secure Hash Algorithm, SHA-1, as defined in FIPS PUB 180-1. This is a 160-bit (20-byte) cryptographic hash function. SHA1 is generally secure, though there are potential weaknesses on the order of 2^51. This implementation is based on the implementation due to Sam Ruby, Paul Johnson, and John Wilson.

Since:

3.4.2

Author:

krdixon

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected static byte[]	DEFAULT_SEED Default seed
static int	LENGTH SHA-1 hash function output is 160-bits or 20-bytes, 20.

Constructor Summary

Constructors

Constructor and Description
SHA1Hash() Default constructor

Method Summary

Modifier and Type	Method and Description
void	evaluateInto(byte[] input, byte[] output, byte[] seed) Evaluates the input into the given output
byte[]	getDefaultSeed() Gets the default seed for the hash function
static byte[]	hash(byte[] input) Computes the SHA-1 representation of the given input.
static void	hash(byte[] input, byte[] output) Computes the SHA-1 representation of the given input.
static void	hash(byte[] x, byte[] output, byte[] seed) Computes the SHA-1 representation of the given input and seed.
int	length() Returns the number of bytes in the output hash code.

Methods inherited from class gov.sandia.cognition.hash.AbstractHashFunction

clone, evaluate, evaluate, evaluateInto

Methods inherited from class java.lang.Object

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

Field Detail

LENGTH

public static final int LENGTH

SHA-1 hash function output is 160-bits or 20-bytes, 20.

See Also:

Constant Field Values

DEFAULT_SEED

protected static final byte[] DEFAULT_SEED

Default seed

Constructor Detail

SHA1Hash

public SHA1Hash()

Default constructor

Method Detail

hash

public static byte[] hash(byte[] input)

Computes the SHA-1 representation of the given input.

Parameters:

input - Input byte array to compute the SHA-1 hash of.

Returns:

160-bit (20-byte) SHA-1 representation of the input.

hash

public static void hash(byte[] input,
                        byte[] output)

Computes the SHA-1 representation of the given input.

Parameters:

input - Input byte array to compute the SHA-1 hash of.

output - Output to store the hash into

hash

public static void hash(byte[] x,
                        byte[] output,
                        byte[] seed)

Computes the SHA-1 representation of the given input and seed.

Parameters:

x - Input byte array to compute the SHA-1 hash of.

seed - Seed to use to offset the hash function

output - 160-bit (20-byte) SHA-1 representation of the input and seed.

evaluateInto

public void evaluateInto(byte[] input,
                         byte[] output,
                         byte[] seed)

Description copied from interface: HashFunction

Evaluates the input into the given output

Parameters:

input - Input to compute the hash-function value of

output - Output to put the hash-function into

seed - Seed to offset the hash code.

length

public int length()

Description copied from interface: HashFunction

Returns the number of bytes in the output hash code.

Returns:

Number of bytes in the output hash code.

getDefaultSeed

public byte[] getDefaultSeed()

Description copied from interface: HashFunction

Gets the default seed for the hash function

Returns:

Default seed for the hash algorithm