Module org.cryptomator.cryptolib

Package org.cryptomator.cryptolib.common

Class Scrypt

java.lang.Object

org.cryptomator.cryptolib.common.Scrypt

public class Scrypt
extends Object

Method Summary

Modifier and Type	Method	Description
static byte[]	scrypt(byte[] passphrase, byte[] salt, int costParam, int blockSize, int keyLengthInBytes)	Derives a key from the given passphrase.
static byte[]	scrypt(CharSequence passphrase, byte[] salt, int costParam, int blockSize, int keyLengthInBytes)	Derives a key from the given passphrase.

Methods inherited from class java.lang.Object

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

Method Detail

scrypt

public static byte[] scrypt(CharSequence passphrase,
                            byte[] salt,
                            int costParam,
                            int blockSize,
                            int keyLengthInBytes)

Derives a key from the given passphrase. This implementation makes sure, any copies of the passphrase used during key derivation are overwritten in memory asap (before next GC cycle).

Parameters:

passphrase - The passphrase, whose characters will get UTF-8 encoded during key derivation.

salt - Salt, ideally randomly generated

costParam - Cost parameter N, larger than 1, a power of 2 and less than 2^(128 * blockSize / 8)

blockSize - Block size r

keyLengthInBytes - Key output length dkLen

Returns:

Derived key

See Also:

RFC 7914

scrypt

public static byte[] scrypt(byte[] passphrase,
                            byte[] salt,
                            int costParam,
                            int blockSize,
                            int keyLengthInBytes)

Derives a key from the given passphrase. This implementation makes sure, any copies of the passphrase used during key derivation are overwritten in memory asap (before next GC cycle).

Parameters:

passphrase - The passphrase,

salt - Salt, ideally randomly generated

costParam - Cost parameter N, larger than 1, a power of 2 and less than 2^(128 * blockSize / 8)

blockSize - Block size r

keyLengthInBytes - Key output length dkLen

Returns:

Derived key

See Also:

RFC 7914