MD5加密工具

 

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
* 平台MD5加密工具
*/
public class MD5Util {

// MD5
private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

public static String md5(String text) {
return md5(new String[]{text});
}

public static String md5(String[] text) {
byte[] bytes = digest(text);
return new String(encodeHex(bytes));
}
/**
* 前64位转换为long
*/
public static long halfDigest(String... text) {
long ret = 0;
byte[] bytes = digest(text);
for (int i=0; i<8; i++)
ret = ret << 8 | (bytes[i] & 0xFFL);
return ret;
}

public static byte[] digest(String... text) {
MessageDigest msgDigest = null;
try {
msgDigest = MessageDigest.getInstance("MD5");
}
catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(
"System doesn't support MD5 algorithm.");
}

try {
for (String str : text) {
msgDigest.update(str.getBytes("utf-8"));
}

}
catch (UnsupportedEncodingException e) {

throw new IllegalStateException(
"System doesn't support your EncodingException.");

}

return msgDigest.digest();
}

// 16位的MD5就是32位的中间的是内容
public static String md5_16(String text) {
return md5(text).substring(8, 24);
}

public static char[] encodeHex(byte[] data) {

int l = data.length;

char[] out = new char[l << 1];

// two characters form the hex value.
for (int i = 0, j = 0; i < l; i++) {
out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];
out[j++] = DIGITS[0x0F & data[i]];
}
return out;
}

public static void main(String[] args) {
System.out.println(MD5Util.md5("ws.jpg"));
}

}

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