java和js实现MD5加密

java

import java.security.MessageDigest;

public class Demo2 {
    public static void main(String[] args) {
        Demo2 demo2 = new Demo2();
        String encry = demo2.md5("admin");
        System.out.println("加密后：" + encry);

    }

    /**
     * md5加密
     */
    private static String md5(String input) {
        String encry = "";
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            char[] charArray = input.toCharArray();
            byte[] byteArray = new byte[charArray.length];

            for (int i = 0; i < charArray.length; i++)
                byteArray[i] = (byte) charArray[i];
            byte[] md5Bytes = md5.digest(byteArray);
            StringBuffer hexValue = new StringBuffer();
            for (int i = 0; i < md5Bytes.length; i++) {
                int val = ((int) md5Bytes[i]) & 0xff;
                if (val < 16)
                    hexValue.append("0");
                hexValue.append(Integer.toHexString(val));
            }
            encry = hexValue.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return encry;
    }
}

js

function MD5(sMessage) {
	function RotateLeft(lValue, iShiftBits) {
		return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
	}
	function AddUnsigned(lX, lY) {
		var lX4, lY4, lX8, lY8, lResult;
		lX8 = (lX & 0x80000000);
		lY8 = (lY & 0x80000000);
		lX4 = (lX & 0x40000000);
		lY4 = (lY & 0x40000000);
		lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);
		if (lX4 & lY4) return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
		if (lX4 | lY4) {
			if (lResult & 0x40000000) return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
			else return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
		} else return (lResult ^ lX8 ^ lY8);
	}
	function F(x, y, z) {
		return (x & y) | ((~x) & z);
	}
	function G(x, y, z) {
		return (x & z) | (y & (~z));
	}
	function H(x, y, z) {
		return (x ^ y ^ z);
	}
	function I(x, y, z) {
		return (y ^ (x | (~z)));
	}
	function FF(a, b, c, d, x, s, ac) {
		a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
		return AddUnsigned(RotateLeft(a, s), b);
	}
	function GG(a, b, c, d, x, s, ac) {
		a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
		return AddUnsigned(RotateLeft(a, s), b);
	}
	function HH(a, b, c, d, x, s, ac) {
		a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
		return AddUnsigned(RotateLeft(a, s), b);
	}
	function II(a, b, c, d, x, s, ac) {
		a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
		return AddUnsigned(RotateLeft(a, s), b);
	}
	function ConvertToWordArray(sMessage) {
		var lWordCount;
		var lMessageLength = sMessage.length;
		var lNumberOfWords_temp1 = lMessageLength + 8;
		var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;
		var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;
		var lWordArray = Array(lNumberOfWords - 1);
		var lBytePosition = 0;
		var lByteCount = 0;
		while (lByteCount < lMessageLength) {
			lWordCount = (lByteCount - (lByteCount % 4)) / 4;
			lBytePosition = (lByteCount % 4) * 8;
			lWordArray[lWordCount] = (lWordArray[lWordCount] | (sMessage.charCodeAt(lByteCount) << lBytePosition));
			lByteCount++;
		}
		lWordCount = (lByteCount - (lByteCount % 4)) / 4;
		lBytePosition = (lByteCount % 4) * 8;
		lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);
		lWordArray[lNumberOfWords - 2] = lMessageLength << 3;
		lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;
		return lWordArray;
	}
	function WordToHex(lValue) {
		var WordToHexValue = "",
		WordToHexValue_temp = "",
		lByte, lCount;
		for (lCount = 0; lCount <= 3; lCount++) {
			lByte = (lValue >>> (lCount * 8)) & 255;
			WordToHexValue_temp = "0" + lByte.toString(16);
			WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2)
		}
		return WordToHexValue;
	}
	var x = Array();
	var k, AA, BB, CC, DD, a, b, c, d
	var S11 = 7,
	S12 = 12,
	S13 = 17,
	S14 = 22;
	var S21 = 5,
	S22 = 9,
	S23 = 14,
	S24 = 20;
	var S31 = 4,
	S32 = 11,
	S33 = 16,
	S34 = 23;
	var S41 = 6,
	S42 = 10,
	S43 = 15,
	S44 = 21;
	x = ConvertToWordArray(sMessage);
	a = 0x67452301;
	b = 0xEFCDAB89;
	c = 0x98BADCFE;
	d = 0x10325476;
	for (k = 0; k < x.length; k += 16) {
		AA = a;
		BB = b;
		CC = c;
		DD = d;
		a = FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);
		d = FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);
		c = FF(c, d, a, b, x[k + 2], S13, 0x242070DB);
		b = FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);
		a = FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);
		d = FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);
		c = FF(c, d, a, b, x[k + 6], S13, 0xA8304613);
		b = FF(b, c, d, a, x[k + 7], S14, 0xFD469501);
		a = FF(a, b, c, d, x[k + 8], S11, 0x698098D8);
		d = FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);
		c = FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);
		b = FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);
		a = FF(a, b, c, d, x[k + 12], S11, 0x6B901122);
		d = FF(d, a, b, c, x[k + 13], S12, 0xFD987193);
		c = FF(c, d, a, b, x[k + 14], S13, 0xA679438E);
		b = FF(b, c, d, a, x[k + 15], S14, 0x49B40821);
		a = GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);
		d = GG(d, a, b, c, x[k + 6], S22, 0xC040B340);
		c = GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);
		b = GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);
		a = GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);
		d = GG(d, a, b, c, x[k + 10], S22, 0x2441453);
		c = GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);
		b = GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);
		a = GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);
		d = GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);
		c = GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);
		b = GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);
		a = GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);
		d = GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);
		c = GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);
		b = GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);
		a = HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);
		d = HH(d, a, b, c, x[k + 8], S32, 0x8771F681);
		c = HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);
		b = HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);
		a = HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);
		d = HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);
		c = HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);
		b = HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);
		a = HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);
		d = HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);
		c = HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);
		b = HH(b, c, d, a, x[k + 6], S34, 0x4881D05);
		a = HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);
		d = HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);
		c = HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);
		b = HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);
		a = II(a, b, c, d, x[k + 0], S41, 0xF4292244);
		d = II(d, a, b, c, x[k + 7], S42, 0x432AFF97);
		c = II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);
		b = II(b, c, d, a, x[k + 5], S44, 0xFC93A039);
		a = II(a, b, c, d, x[k + 12], S41, 0x655B59C3);
		d = II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);
		c = II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);
		b = II(b, c, d, a, x[k + 1], S44, 0x85845DD1);
		a = II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);
		d = II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);
		c = II(c, d, a, b, x[k + 6], S43, 0xA3014314);
		b = II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);
		a = II(a, b, c, d, x[k + 4], S41, 0xF7537E82);
		d = II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);
		c = II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);
		b = II(b, c, d, a, x[k + 9], S44, 0xEB86D391);
		a = AddUnsigned(a, AA);
		b = AddUnsigned(b, BB);
		c = AddUnsigned(c, CC);
		d = AddUnsigned(d, DD);
	}
	var temp = WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d);
	return temp.toLowerCase();
}

完了。谢谢！