freenet.crypt

Class Util

java.lang.Object

freenet.crypt.Util

public class Util
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	BUFFER_SIZE
static java.util.Map<java.lang.String,java.security.Provider>	mdProviders
static java.math.BigInteger	TWO

Constructor Summary

Constructors

Constructor and Description
Util()

Method Summary

Modifier and Type	Method and Description
static boolean	byteArrayEqual(byte[] a, byte[] b, int offset, int length) Deprecated.
static void	fillByteArrayFromInts(int[] ints, byte[] bytes)
static void	fillByteArrayFromLongs(long[] ints, byte[] bytes)
static BlockCipher	getCipherByName(java.lang.String name)
static BlockCipher	getCipherByName(java.lang.String name, int keySize)
static byte[]	hashBytes(java.security.MessageDigest d, byte[] b)
static byte[]	hashBytes(java.security.MessageDigest d, byte[] b, int offset, int length)
static byte[]	hashString(java.security.MessageDigest d, java.lang.String s) Hashes a string in a consistent manner
static double	keyDigestAsNormalizedDouble(byte[] digest)
static int	log2(long n)
static void	main(java.lang.String[] args)
static void	makeKey(byte[] entropy, byte[] key, int offset, int len)
static byte[]	MPIbytes(java.math.BigInteger num)
static void	randomBytes(java.util.Random r, byte[] buf) Fill byte array with random data.
static void	randomBytes(java.util.Random r, byte[] buf, int from, int len) Fill specified range of byte array with random data.
static void	randomBytes(java.security.SecureRandom r, byte[] buf)
static void	randomBytes(java.security.SecureRandom r, byte[] buf, int from, int len)
static void	readFully(java.io.InputStream in, byte[] b)
static void	readFully(java.io.InputStream in, byte[] b, int off, int length)
static java.math.BigInteger	readMPI(java.io.InputStream in)
static void	writeMPI(java.math.BigInteger num, java.io.OutputStream out)
static byte[]	xor(byte[] b1, byte[] b2)

Methods inherited from class java.lang.Object

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

Field Detail

BUFFER_SIZE

protected static final int BUFFER_SIZE

See Also:

Constant Field Values

TWO

public static final java.math.BigInteger TWO

mdProviders

public static final java.util.Map<java.lang.String,java.security.Provider> mdProviders

Constructor Detail

Util

public Util()

Method Detail

fillByteArrayFromInts

public static void fillByteArrayFromInts(int[] ints,
                                         byte[] bytes)

fillByteArrayFromLongs

public static void fillByteArrayFromLongs(long[] ints,
                                          byte[] bytes)

MPIbytes

public static byte[] MPIbytes(java.math.BigInteger num)

writeMPI

public static void writeMPI(java.math.BigInteger num,
                            java.io.OutputStream out)
                     throws java.io.IOException

Throws:

java.io.IOException

readMPI

public static java.math.BigInteger readMPI(java.io.InputStream in)
                                    throws java.io.IOException

Throws:

java.io.IOException

hashBytes

public static byte[] hashBytes(java.security.MessageDigest d,
                               byte[] b)

hashBytes

public static byte[] hashBytes(java.security.MessageDigest d,
                               byte[] b,
                               int offset,
                               int length)

hashString

public static byte[] hashString(java.security.MessageDigest d,
                                java.lang.String s)

Hashes a string in a consistent manner

xor

public static byte[] xor(byte[] b1,
                         byte[] b2)

randomBytes

public static void randomBytes(java.security.SecureRandom r,
                               byte[] buf)

randomBytes

public static void randomBytes(java.security.SecureRandom r,
                               byte[] buf,
                               int from,
                               int len)

randomBytes

public static void randomBytes(java.util.Random r,
                               byte[] buf)

Fill byte array with random data. randomBytes(random, buf) is same as random.nextBytes(buf)

randomBytes

public static void randomBytes(java.util.Random r,
                               byte[] buf,
                               int from,
                               int len)

Fill specified range of byte array with random data. Optimised version for Random with fast nextInt(). Must be same as randomBytesSlowNextInt(buf, from, len). WARNING: full compatibility with randomBytesSlowNextInt() is *critical*!

byteArrayEqual

@Deprecated
public static boolean byteArrayEqual(byte[] a,
                                                 byte[] b,
                                                 int offset,
                                                 int length)

Deprecated.

makeKey

public static void makeKey(byte[] entropy,
                           byte[] key,
                           int offset,
                           int len)

getCipherByName

public static BlockCipher getCipherByName(java.lang.String name)

getCipherByName

public static BlockCipher getCipherByName(java.lang.String name,
                                          int keySize)

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception

log2

public static int log2(long n)

Returns:

log2 of n, rounded up to the nearest integer

readFully

public static void readFully(java.io.InputStream in,
                             byte[] b)
                      throws java.io.IOException

Throws:

java.io.IOException

readFully

public static void readFully(java.io.InputStream in,
                             byte[] b,
                             int off,
                             int length)
                      throws java.io.IOException

Throws:

java.io.IOException

keyDigestAsNormalizedDouble

public static double keyDigestAsNormalizedDouble(byte[] digest)