org.h2.security

Class SHA256

java.lang.Object

org.h2.security.SHA256

public class SHA256
extends java.lang.Object

This class implements the cryptographic hash function SHA-256.

Method Summary

Modifier and Type	Method and Description
static byte[]	getHash(byte[] data, boolean nullData) Calculate the hash code for the given data.
static byte[]	getHashWithSalt(byte[] data, byte[] salt) Calculate the hash code by using the given salt.
static byte[]	getHMAC(byte[] key, byte[] message) Calculate the hash-based message authentication code.
static byte[]	getKeyPasswordHash(java.lang.String userName, char[] password) Calculate the hash of a password by prepending the user name and a '@' character.
static byte[]	getPBKDF2(byte[] password, byte[] salt, int iterations, int resultLen) Calculate the hash using the password-based key derivation function 2.

Methods inherited from class java.lang.Object

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

Method Detail

getHashWithSalt

public static byte[] getHashWithSalt(byte[] data,
                                     byte[] salt)

Calculate the hash code by using the given salt. The salt is appended after the data before the hash code is calculated. After generating the hash code, the data and all internal buffers are filled with zeros to avoid keeping insecure data in memory longer than required (and possibly swapped to disk).

Parameters:

data - the data to hash

salt - the salt to use

Returns:

the hash code

getKeyPasswordHash

public static byte[] getKeyPasswordHash(java.lang.String userName,
                                        char[] password)

Calculate the hash of a password by prepending the user name and a '@' character. Both the user name and the password are encoded to a byte array using UTF-16. After generating the hash code, the password array and all internal buffers are filled with zeros to avoid keeping the plain text password in memory longer than required (and possibly swapped to disk).

Parameters:

userName - the user name

password - the password

Returns:

the hash code

getHMAC

public static byte[] getHMAC(byte[] key,
                             byte[] message)

Calculate the hash-based message authentication code.

Parameters:

key - the key

message - the message

Returns:

the hash

getPBKDF2

public static byte[] getPBKDF2(byte[] password,
                               byte[] salt,
                               int iterations,
                               int resultLen)

Calculate the hash using the password-based key derivation function 2.

Parameters:

password - the password

salt - the salt

iterations - the number of iterations

resultLen - the number of bytes in the result

Returns:

the result

getHash

public static byte[] getHash(byte[] data,
                             boolean nullData)

Calculate the hash code for the given data.

Parameters:

data - the data to hash

nullData - if the data should be filled with zeros after calculating the hash code

Returns:

the hash code