SecretUtils.java
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package com.subsidy.util;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.UUID;
public class SecretUtils {
/**
* 对用户登录密码进行MD5加密
*
* @param str
* @return
*/
public static String getMD5String(String str) {
try {
// 生成一个MD5加密计算摘要
MessageDigest md = MessageDigest.getInstance("MD5");
// 计算md5函数
md.update(str.getBytes());
// digest()最后确定返回md5 hash值，返回值为8位字符串。因为md5 hash值是16位的hex值，实际上就是8位的字符
// BigInteger函数则将8位的字符串转换成16位hex值，用字符串来表示；得到字符串形式的hash值
//一个byte是八位二进制，也就是2位十六进制字符（2的8次方等于16的2次方）
return new BigInteger(1, md.digest()).toString(16);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 对字符串进行SHA加密
*
* @param
*/
public static String getSHAString(String str) {
try {
MessageDigest sha = MessageDigest.getInstance("SHA-1");
byte[] byteArray = str.getBytes(StandardCharsets.UTF_8);
byte[] md5Bytes = sha.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16) {
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
} catch (Exception e) {
return null;
}
}
private static byte[] md5(String s)
{
MessageDigest algorithm;
try
{
algorithm = MessageDigest.getInstance("MD5");
algorithm.reset();
algorithm.update(s.getBytes("UTF-8"));
byte[] messageDigest = algorithm.digest();
return messageDigest;
}
catch (Exception e)
{
}
return null;
}
private static final String toHex(byte hash[])
{
if (hash == null)
{
return null;
}
StringBuffer buf = new StringBuffer(hash.length * 2);
int i;
for (i = 0; i < hash.length; i++)
{
if ((hash[i] & 0xff) < 0x10)
{
buf.append("0");
}
buf.append(Long.toString(hash[i] & 0xff, 16));
}
return buf.toString();
}
public static String hash(String s)
{
try
{
return new String(toHex(md5(s)).getBytes("UTF-8"), "UTF-8");
}
catch (Exception e)
{
return s;
}
}
public static void main(String[] args) {
String uuid = UUID.randomUUID().toString();
System.out.println(uuid);
System.out.println(hash(uuid+"ixihs"));
}
}