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org.bouncycastle.crypto.general

pack-priv Class SCryptImpl

Class Inheritance

extends Object

java.lang.Object
org.bouncycastle.crypto.general.SCryptImpl

Imports

org.bouncycastle.crypto.fips.FipsSHS, org.bouncycastle.crypto.internal.PBEParametersGenerator, org.bouncycastle.crypto.internal.params.KeyParameter, org.bouncycastle.util.Arrays, .Pack

Implementation of the scrypt a password-based key derivation function.

Scrypt was created by Colin Percival and is specified in RFC 7914 - The scrypt Password-Based Key Derivation Function

Constructor Summary

Access	Constructor and Description
private	SCryptImpl()

Method Summary

Modifier and Type	Method and Description
private static void	BlockMix(int[] B, int[] X1, int[] X2, int[] Y, int r)
private static void	Clear(byte[] array)
private static void	Clear(int[] array)
private static void	ClearAll(int[][] arrays)
public static byte[]	Returns: the generated key. generate(byte[] the bytes of the pass phrase. P, byte[] the salt to use for this invocation. S, int CPU/Memory cost parameter. Must be larger than 1, a power of 2 and less than `2^(128 * r / 8)`. N, int the block size, must be >= 1. r, int Parallelization parameter. Must be a positive integer less than or equal to `Integer.MAX_VALUE / (128 * r * 8)`. p, int the length of the key to generate. dkLen) Generate a key using the scrypt key derivation function.
private static boolean	isPowerOf2(int x)
private static byte[]	MFcrypt(byte[] P, byte[] S, int N, int r, int p, int dkLen)
private static byte[]	SingleIterationPBKDF2(byte[] P, byte[] S, int dkLen)
private static void	SMix(int[] B, int BOff, int N, int r)
private static void	Xor(int[] a, int[] b, int bOff, int[] output)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Constructor Detail

SCryptImpl	back to summary
private SCryptImpl()

Method Detail

BlockMix	back to summary
private static void BlockMix(int[] B, int[] X1, int[] X2, int[] Y, int r)

Clear	back to summary
private static void Clear(byte[] array)

Clear	back to summary
private static void Clear(int[] array)

ClearAll	back to summary
private static void ClearAll(int[][] arrays)

generate back to summary

public static byte[] generate(byte[] P, byte[] S, int N, int r, int p, int dkLen)

Generate a key using the scrypt key derivation function.

Parameters

P:byte[]: the bytes of the pass phrase.
S:byte[]: the salt to use for this invocation.
N:int: CPU/Memory cost parameter. Must be larger than 1, a power of 2 and less than 2^(128 * r / 8).
r:int: the block size, must be >= 1.
p:int: Parallelization parameter. Must be a positive integer less than or equal to Integer.MAX_VALUE / (128 * r * 8).
dkLen:int: the length of the key to generate.

Returns:byte[]

the generated key.

isPowerOf2	back to summary
private static boolean isPowerOf2(int x)

MFcrypt	back to summary
private static byte[] MFcrypt(byte[] P, byte[] S, int N, int r, int p, int dkLen)

SingleIterationPBKDF2	back to summary
private static byte[] SingleIterationPBKDF2(byte[] P, byte[] S, int dkLen)

SMix	back to summary
private static void SMix(int[] B, int BOff, int N, int r)

Xor	back to summary
private static void Xor(int[] a, int[] b, int bOff, int[] output)