cn.ponfee.commons.jce.passwd

类 SCrypt

java.lang.Object

cn.ponfee.commons.jce.passwd.SCrypt

public final class SCrypt
extends Object

An implementation of the scrypt key derivation function. This class will attempt to load a native library containing the optimized C implementation from http://www.tarsnap.com/scrypt.html and fall back to the pure Java version if that fails.

作者:

Will Glozer Reference from internet and with optimization

方法概要

限定符和类型	方法和说明
static boolean	check(String passwd, String hashed) Compare the supplied plaintext password to a hashed password.
static String	create(HmacAlgorithms alg, String passwd, int N, int r, int p, int dkLen) Hash the supplied plaintext password and generate output in the format described in scrypt(HmacAlgorithms, byte[], byte[], int, int, int, int).
static String	create(String passwd, int N, int r, int p)
static byte[]	pbkdf2(HmacAlgorithms alg, byte[] P, byte[] S, int c, int dkLen) Implementation of PBKDF2 (RFC2898).
static byte[]	scrypt(HmacAlgorithms alg, byte[] P, byte[] S, int N, int r, int p, int dkLen) Pure Java implementation of the scrypt KDF.

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 passwd,
                            int N,
                            int r,
                            int p)

create

public static String create(HmacAlgorithms alg,
                            String passwd,
                            int N,
                            int r,
                            int p,
                            int dkLen)

Hash the supplied plaintext password and generate output in the format described in scrypt(HmacAlgorithms, byte[], byte[], int, int, int, int).

参数:

alg - HmacAlgorithm.

passwd - Password.

N - CPU cost parameter. between 0x01 and 0x0F, 2^15=32768

r - Memory cost parameter. between 0x01 and 0xFF

p - Parallelization parameter. between 0x01 and 0xFF

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

返回:

The hashed password.

check

public static boolean check(String passwd,
                            String hashed)

Compare the supplied plaintext password to a hashed password.

参数:

passwd - Plaintext password.

hashed - scrypt hashed password.

返回:

true if passwd matches hashed value.

pbkdf2

public static byte[] pbkdf2(HmacAlgorithms alg,
                            byte[] P,
                            byte[] S,
                            int c,
                            int dkLen)

Implementation of PBKDF2 (RFC2898).

参数:

alg - HmacAlgorithm.

P - password of byte array.

S - Salt.

c - Iteration count.

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

返回:

the byte array of DK

scrypt

public static byte[] scrypt(HmacAlgorithms alg,
                            byte[] P,
                            byte[] S,
                            int N,
                            int r,
                            int p,
                            int dkLen)

Pure Java implementation of the scrypt KDF.

参数:

alg - HmacAlgorithm.

P - Password.

S - Salt.

N - CPU cost parameter.

r - Memory cost parameter.

p - Parallelization parameter.

dkLen - Intended length of the derived key.

返回:

The derived key.