Here you can find the source of md5(String str)
Parameter | Description |
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str | a parameter |
public static String md5(String str)
//package com.java2s; //License from project: Apache License import java.security.MessageDigest; public class Main { /**/*from www . ja va2s . c o m*/ * Used to build output as Hex */ private static final char[] DIGITS_LOWER = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; /** * encode By MD5 * * @param str * @return String */ public static String md5(String str) { if (str == null) { return null; } try { MessageDigest messageDigest = MessageDigest.getInstance("MD5"); messageDigest.update(str.getBytes()); return new String(encodeHex(messageDigest.digest())); } catch (Exception e) { throw new RuntimeException(e); } } /** * Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order. * The returned array will be double the length of the passed array, as it takes two characters to represent any * given byte. * * @param data a byte[] to convert to Hex characters * @return A char[] containing hexadecimal characters */ protected static char[] encodeHex(final byte[] data) { final int l = data.length; final char[] out = new char[l << 1]; // two characters form the hex value. for (int i = 0, j = 0; i < l; i++) { out[j++] = DIGITS_LOWER[(0xF0 & data[i]) >>> 4]; out[j++] = DIGITS_LOWER[0x0F & data[i]]; } return out; } }