cn.ponfee.commons.util

类 Base58

java.lang.Object

cn.ponfee.commons.util.Base58

public class Base58
extends Object

 https://www.jianshu.com/p/ffc97c4d2306
 在计算机系统中数值使用补码来表示和存储
  原码（True form）               ：正数的原码为其二进制；负数的原码为对应的正数值在高位补1；
  反码（1's complement）：正数的反码与原码相同；负数的反码为其原码除符号位以外各位取反；
  补码（2's complement）：正数的补码与原码相同；负数的补码为其反码（最低位）加1；
 
 补码系统的最大优点是可以在加法或减法处理中，不需因为数字的正负而使用不同的计算方式
 计算机中只有加法，用两数补码相加，结果仍是补码表示
 补码转原码：减1再取反
 
 byte b = a byte number;
 int i = b & 0xff; // 使得i与b的二进制补码一致
 
 0xff is the bit length mask, calc bit length mask can use: 
      (1<<bits)-1 or -1L^(-1L<<bits)
 
 Base58 code：except number 0, uppercase letter I and O, lowercase latter l
 Reference from internet
 

作者:

Ponfee

构造器概要

构造器

构造器和说明
Base58()

方法概要

限定符和类型	方法和说明
static byte[]	decode(String data) Decodes the given base58 string into the original data bytes.
static byte[]	decodeChecked(String data) Decodes the given base58 string into the original data bytes, using the checksum in the last 4 bytes of the decoded data to verify that the rest are correct.
static BigInteger	decodeToBigInteger(String data) base58 decode and construct BigInteger
static String	encode(byte[] data) Encodes the given bytes as a base58 string (no checksum is appended).
static String	encodeChecked(byte[] data) Encodes the given bytes as a base58 string (with appended checksum).

从类继承的方法 java.lang.Object

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

构造器详细资料

Base58

public Base58()

方法详细资料

encode

public static String encode(byte[] data)

Encodes the given bytes as a base58 string (no checksum is appended).

参数:

data - the bytes to encode

返回:

the base58-encoded string

decode

public static byte[] decode(String data)

Decodes the given base58 string into the original data bytes.

参数:

data - the base58-encoded string to decode

返回:

the decoded data bytes

decodeToBigInteger

public static BigInteger decodeToBigInteger(String data)

base58 decode and construct BigInteger

参数:

data - the base58-encoded string to decode

返回:

the BigInteger of base58-decoded

encodeChecked

public static String encodeChecked(byte[] data)

Encodes the given bytes as a base58 string (with appended checksum).

参数:

data - the bytes to encode

返回:

the base58-encoded string is appended checksum

decodeChecked

public static byte[] decodeChecked(String data)

Decodes the given base58 string into the original data bytes, using the checksum in the last 4 bytes of the decoded data to verify that the rest are correct. The checksum is removed from the returned data. if the data is not base 58 or the checksum is invalid then throw IllegalArgumentException

参数:

data - the base58-encoded string to decode (which should include the checksum)