校验BTC、USDT钱包地址合法性

版权声明：望支持~~~ https://blog.csdn.net/u011663149/article/details/86571541

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前言：

     对于钱包地址的校验，有很多方式：

                                        1.热钱包 validateaddress 接口 

                                         2.使用下面提供的工具类

    

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.util.Arrays;

import org.apache.commons.codec.digest.DigestUtils;


public class BtcAddressChecker {
	
	
    /*---- Class constants ----*/

    private static final String ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
    private static final BigInteger ALPHABET_SIZE = BigInteger.valueOf(ALPHABET.length());

    /**
     * 将 Base58Check 字符串反转为 byte 数组
     *
     * @param s
     * @return
     */
    static byte[] base58ToRawBytes(String s) {
        // Parse base-58 string
        BigInteger num = BigInteger.ZERO;
        for (int i = 0; i < s.length(); i++) {
            num = num.multiply(ALPHABET_SIZE);
            int digit = ALPHABET.indexOf(s.charAt(i));
            if (digit == -1) {
                throw new IllegalArgumentException("Invalid character for Base58Check");
            }
            num = num.add(BigInteger.valueOf(digit));
        }
        // Strip possible leading zero due to mandatory sign bit
        byte[] b = num.toByteArray();
        if (b[0] == 0) {
            b = Arrays.copyOfRange(b, 1, b.length);
        }
        try {
            // Convert leading '1' characters to leading 0-value bytes
            ByteArrayOutputStream buf = new ByteArrayOutputStream();
            for (int i = 0; i < s.length() && s.charAt(i) == ALPHABET.charAt(0); i++) {
                buf.write(0);
            }
            buf.write(b);
            return buf.toByteArray();
        } catch (IOException e) {
            throw new AssertionError(e);
        }
    }

    /**
     * 双重Hash
     *
     * @param data
     * @return
     */
    public static byte[] doubleHash(byte[] data) {
        return DigestUtils.sha256(DigestUtils.sha256(data));
    }

      
        /**  
        * @Title: base58ToBytes   验证钱包地址
        * @param @param s
        * @param @return    参数  
        * @return byte[]    返回类型  
        * @throws  
        */  
        
    public static boolean base58ToBytes(String s) {
        byte[] concat = base58ToRawBytes(s);
        byte[] data = Arrays.copyOf(concat, concat.length - 4);
        byte[] hash = Arrays.copyOfRange(concat, concat.length - 4, concat.length);
        byte[] rehash = Arrays.copyOf(doubleHash(data), 4);
        if (!Arrays.equals(rehash, hash)) {
            throw new IllegalArgumentException("Checksum mismatch");
        }
        return true;
    }
    
    public static void main(String[] args) {
		System.out.println(base58ToBytes("bc1q0mpzvyr7wrakn3lanc3lwfl4ey2696kh8pjwru"));
	}
   
}

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