MD5带盐值的java加密算法
import java.security.MessageDigest;
public class PasswordEncoder {
private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
private Object salt;
private String algorithm;
public PasswordEncoder(Object salt, String algorithm) {
this.salt = salt;
this.algorithm = algorithm;
}
public String encode(String rawPass) {
String result = null;
try {
MessageDigest md = MessageDigest.getInstance(algorithm);
//加密后的字符串
result = byteArrayToHexString(md.digest(mergePasswordAndSalt(rawPass).getBytes("utf-8")));
} catch (Exception ex) {
}
return result;
}
public boolean isPasswordValid(String encPass, String rawPass) {
String pass1 = "" + encPass;
String pass2 = encode(rawPass);
return pass1.equals(pass2);
}
private String mergePasswordAndSalt(String password) {
if (password == null) {
password = "";
}
if ((salt == null) || "".equals(salt)) {
return password;
} else {
return password + "{" + salt.toString() + "}";
}
}
/**
* 转换字节数组为16进制字串
* @param b 字节数组
* @return 16进制字串
*/
private static String byteArrayToHexString(byte[] b) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++) {
resultSb.append(byteToHexString(b[i]));
}
return resultSb.toString();
}
private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n = 256 + n;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
public static void main(String[] args) {
String salt = "helloworld";
PasswordEncoder encoderMd5 = new PasswordEncoder(salt, "MD5");
String encode = encoderMd5.encode("test");
System.out.println(encode);
boolean passwordValid = encoderMd5.isPasswordValid("1bd98ed329aebc7b2f89424b5a38926e", "test");
System.out.println(passwordValid);
PasswordEncoder encoderSha = new PasswordEncoder(salt, "SHA");
String pass2 = encoderSha.encode("test");
System.out.println(pass2);
boolean passwordValid2 = encoderSha.isPasswordValid("1bd98ed329aebc7b2f89424b5a38926e", "test");
System.out.println(passwordValid2);
}
}
转自:http://www.cnblogs.com/yinww/archive/2009/12/02/1615542.html