package common.util.security;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class EncryptUtil {
public static void main(String[] args) {
//md5加密测试
String md5_1 = md5("123");
String md5_2 = md5("abc");
System.out.println(md5_1 + "\n" + md5_2);
System.out.println("md5 length: " + md5_1.length());
//sha加密测试
String sha_1 = sha("123");
String sha_2 = sha("abc");
System.out.println(sha_1 + "\n" + sha_2);
System.out.println("sha length: " + sha_1.length());
}
// md5加密
public static String md5(String inputText) {
return encrypt(inputText, "md5");
}
// sha加密
public static String sha(String inputText) {
return encrypt(inputText, "sha-1");
}
/**
* md5或者sha-1加密
*
* @param inputText
* 要加密的内容
* @param algorithmName
* 加密算法名称：md5或者sha-1，不区分大小写
* @return
*/
private static String encrypt(String inputText, String algorithmName) {
if (inputText == null || "".equals(inputText.trim())) {
throw new IllegalArgumentException("请输入要加密的内容");
}
if (algorithmName == null || "".equals(algorithmName.trim())) {
algorithmName = "md5";
}
String encryptText = null;
try {
MessageDigest m = MessageDigest.getInstance(algorithmName);
m.update(inputText.getBytes("UTF8"));
byte s[] = m.digest();
// m.digest(inputText.getBytes("UTF8"));
return hex(s);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return encryptText;
}
// 返回十六进制字符串
private static String hex(byte[] arr) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < arr.length; ++i) {
sb.append(Integer.toHexString((arr[i] & 0xFF) | 0x100).substring(1,
3));
}
return sb.toString();
}
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