dsplend.utils

Class Utils

java.lang.Object

dsplend.utils.Utils

public class Utils
extends Object

Constructor Summary

Constructors

Constructor and Description
Utils()

Method Summary

Modifier and Type	Method and Description
static byte[]	bigIntegerToBytes(BigInteger b, int numBytes) The regular BigInteger.toByteArray() includes the sign bit of the number and might result in an extra byte addition.
static byte[]	longToBytes(long value)
static String	toAddressFromPublicKey(String publicKey)
static byte[]	toByteArray(String s)
static String	toHexString(byte[] bytes)

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

bigIntegerToBytes

public static byte[] bigIntegerToBytes(BigInteger b,
                                       int numBytes)

The regular BigInteger.toByteArray() includes the sign bit of the number and might result in an extra byte addition. This method removes this extra byte.

Assuming only positive numbers, it's possible to discriminate if an extra byte is added by checking if the first element of the array is 0 (0000_0000). Due to the minimal representation provided by BigInteger, it means that the bit sign is the least significant bit 0000_0000 . Otherwise the representation is not minimal. For example, if the sign bit is 0000_0000, then the representation is not minimal due to the rightmost zero.

Parameters:

b - the integer to format into a byte array

numBytes - the desired size of the resulting byte array

Returns:

numBytes byte long array.

toHexString

public static String toHexString(byte[] bytes)

Parameters:

bytes -

Returns:

toByteArray

public static byte[] toByteArray(String s)

Parameters:

s -

Returns:

longToBytes

public static byte[] longToBytes(long value)

Parameters:

value -

Returns:

toAddressFromPublicKey

public static String toAddressFromPublicKey(String publicKey)
                                     throws Exception

Parameters:

publicKey -

Returns:

Throws:

Exception