com.ttianjun.common.kit.security.MD5Util Maven / Gradle / Ivy
package com.ttianjun.common.kit.security;
import java.security.MessageDigest;
public class MD5Util {
private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
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;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
/**
* MD5 32位加密
*
* @param origin
* 字符源
* @param charset
* 字符编码
* @return 32位密文
*/
public static String code32(String origin, String charset) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charset == null || charset.isEmpty()) {
resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
} else {
resultString = byteArrayToHexString(md.digest(resultString.getBytes(charset)));
}
} catch (Exception exception) {
}
return resultString;
}
/**
* MD5 16位加密
*
* @param origin
* 字符源
* @param charset
* 字符编码
* @return 16位密文
*/
public static String code16(String origin, String charset) {
String resultString = code32(origin, charset);
return resultString.substring(8, 24);
}
public static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString;
}
public static String doSign(String content, String privateKey, String charset) throws Exception {
String signStr = "";
try {
StringBuffer sb = new StringBuffer();
sb.append(content);
sb.append(privateKey);
signStr = MD5Encode(sb.toString(), charset);
} catch (Exception e) {
// TODO Auto-generated catch block
throw new Exception("MD5签名[content = " + content + "; privateKey = " + privateKey + "; charset = " + charset + "]发生异常!", e);
}
return signStr;
}
public static String md5Sign(String plainText,String charset) throws Exception {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes(charset));
byte b[] = md.digest();
int i;
StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
return buf.toString();
}
public static void main(String[] args) {
}
}