cn.ponfee.commons.jce.passwd

类 PBKDF2

java.lang.Object

cn.ponfee.commons.jce.passwd.PBKDF2

public final class PBKDF2
extends Object

PBKDF2 salted password hashing. Author: havoc AT defuse.ca www: http://crackstation.net/hashing-security.htm The OpenJDK implementation does only provide a PBKDF2HmacSHA1Factory.java which has the "HmacSHA1" digest harcoded. As far as I tested, the Oracle JDK is not different in that sense.

作者:

havoc AT defuse.ca Reference from internet and with optimization Password-Based Key Derivation Function 2

方法概要

限定符和类型	方法和说明
static boolean	check(char[] password, String correctHash) Validates a password using a hash.
static boolean	check(String password, String correctHash) Validates a password using a hash.
static String	create(HmacAlgorithms alg, char[] password) fix salt 16 byte iterationCount 32 dkLen 32 byte
static String	create(HmacAlgorithms alg, char[] password, int saltByteSize, int iterationCount, int dkLen) Returns a salted PBKDF2 hash of the password.
static String	create(HmacAlgorithms alg, String password)
static String	create(String password)
static byte[]	pbkdf2(HmacAlgorithms alg, char[] password, byte[] salt, int iterationCount, int dkLen) Computes the PBKDF2 hash of a password.

从类继承的方法 java.lang.Object

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

方法详细资料

create

public static String create(String password)

参数:

password -

返回:

create

public static String create(HmacAlgorithms alg,
                            String password)

create

public static String create(HmacAlgorithms alg,
                            char[] password)

fix salt 16 byte iterationCount 32 dkLen 32 byte

参数:

alg -

password -

返回:

create

public static String create(HmacAlgorithms alg,
                            char[] password,
                            int saltByteSize,
                            int iterationCount,
                            int dkLen)

Returns a salted PBKDF2 hash of the password.

参数:

alg - HmacAlgorithm, HmacAlgorithm.HmacMD5 is invalid

password - the password to hash

saltByteSize - the byte length of random slat

iterationCount - the iteration count (slowness factor)

dkLen - Intended length, in octets, of the derived key.

返回:

a salted PBKDF2 hash of the password

check

public static boolean check(String password,
                            String correctHash)

Validates a password using a hash.

参数:

password - the password to check

correctHash - the hash of the valid password

返回:

true if the password is correct, false if not

check

public static boolean check(char[] password,
                            String correctHash)

Validates a password using a hash.

参数:

password - the password to check

correctHash - the hash of the valid password

返回:

true if the password is correct, false if not

pbkdf2

public static byte[] pbkdf2(HmacAlgorithms alg,
                            char[] password,
                            byte[] salt,
                            int iterationCount,
                            int dkLen)

Computes the PBKDF2 hash of a password.

参数:

alg - the HmacAlgorithm

password - the password to hash

salt - the salt

iterationCount - the iteration count (slowness factor)

dkLen - the length of the hash to compute in bytes

返回:

the PBDKF2 hash of the password