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MD5加密算法(java及js)

2015-04-07

为了防止用户登陆过程中信息被拦截导致信息泄露,我们应该在客户端就对用户密码进行加密。浏览器提交给服务器的是加密后的信息,即使被恶意拦截,被拦截信息也已做了加密处理,现在比较安全的一种加密算法是MD5加

为了防止用户登陆过程中信息被拦截导致信息泄露,我们应该在客户端就对用户密码进行加密浏览器提交给服务器的是加密后的信息,即使被恶意拦截,被拦截信息也已做了加密处理,现在比较安全的一种加密算法是MD5加密算法,尽管MD5是一种单向的加密算法,但网上也有破解网站,所以为了进一步提高安全性,可以进行两次md5加密,或者结合其他的加密方法如3des等进行二次加密。

代码如下:

js版:

var hexcase = 0;
function hex_md5(a) {
	if (a == "")
		return a;
	return rstr2hex(rstr_md5(str2rstr_utf8(a)))
}
function hex_hmac_md5(a, b) {
	return rstr2hex(rstr_hmac_md5(str2rstr_utf8(a), str2rstr_utf8(b)))
}
function md5_vm_test() {
	return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72"
}
function rstr_md5(a) {
	return binl2rstr(binl_md5(rstr2binl(a), a.length * 8))
}
function rstr_hmac_md5(c, f) {
	var e = rstr2binl(c);
	if (e.length > 16) {
		e = binl_md5(e, c.length * 8)
	}
	var a = Array(16), d = Array(16);
	for ( var b = 0; b < 16; b++) {
		a[b] = e[b] ^ 909522486;
		d[b] = e[b] ^ 1549556828
	}
	var g = binl_md5(a.concat(rstr2binl(f)), 512 + f.length * 8);
	return binl2rstr(binl_md5(d.concat(g), 512 + 128))
}
function rstr2hex(c) {
	try {
		hexcase
	} catch (g) {
		hexcase = 0
	}
	var f = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
	var b = "";
	var a;
	for ( var d = 0; d < c.length; d++) {
		a = c.charCodeAt(d);
		b += f.charAt((a >>> 4) & 15) + f.charAt(a & 15)
	}
	return b
}
function str2rstr_utf8(c) {
	var b = "";
	var d = -1;
	var a, e;
	while (++d < c.length) {
		a = c.charCodeAt(d);
		e = d + 1 < c.length ? c.charCodeAt(d + 1) : 0;
		if (55296 <= a && a <= 56319 && 56320 <= e && e <= 57343) {
			a = 65536 + ((a & 1023) << 10) + (e & 1023);
			d++
		}
		if (a <= 127) {
			b += String.fromCharCode(a)
		} else {
			if (a <= 2047) {
				b += String
						.fromCharCode(192 | ((a >>> 6) & 31), 128 | (a & 63))
			} else {
				if (a <= 65535) {
					b += String.fromCharCode(224 | ((a >>> 12) & 15),
							128 | ((a >>> 6) & 63), 128 | (a & 63))
				} else {
					if (a <= 2097151) {
						b += String.fromCharCode(240 | ((a >>> 18) & 7),
								128 | ((a >>> 12) & 63),
								128 | ((a >>> 6) & 63), 128 | (a & 63))
					}
				}
			}
		}
	}
	return b
}
function rstr2binl(b) {
	var a = Array(b.length >> 2);
	for ( var c = 0; c < a.length; c++) {
		a[c] = 0
	}
	for ( var c = 0; c < b.length * 8; c += 8) {
		a[c >> 5] |= (b.charCodeAt(c / 8) & 255) << (c % 32)
	}
	return a
}
function binl2rstr(b) {
	var a = "";
	for ( var c = 0; c < b.length * 32; c += 8) {
		a += String.fromCharCode((b[c >> 5] >>> (c % 32)) & 255)
	}
	return a
}
function binl_md5(p, k) {
	p[k >> 5] |= 128 << ((k) % 32);
	p[(((k + 64) >>> 9) << 4) + 14] = k;
	var o = 1732584193;
	var n = -271733879;
	var m = -1732584194;
	var l = 271733878;
	for ( var g = 0; g < p.length; g += 16) {
		var j = o;
		var h = n;
		var f = m;
		var e = l;
		o = md5_ff(o, n, m, l, p[g + 0], 7, -680876936);
		l = md5_ff(l, o, n, m, p[g + 1], 12, -389564586);
		m = md5_ff(m, l, o, n, p[g + 2], 17, 606105819);
		n = md5_ff(n, m, l, o, p[g + 3], 22, -1044525330);
		o = md5_ff(o, n, m, l, p[g + 4], 7, -176418897);
		l = md5_ff(l, o, n, m, p[g + 5], 12, 1200080426);
		m = md5_ff(m, l, o, n, p[g + 6], 17, -1473231341);
		n = md5_ff(n, m, l, o, p[g + 7], 22, -45705983);
		o = md5_ff(o, n, m, l, p[g + 8], 7, 1770035416);
		l = md5_ff(l, o, n, m, p[g + 9], 12, -1958414417);
		m = md5_ff(m, l, o, n, p[g + 10], 17, -42063);
		n = md5_ff(n, m, l, o, p[g + 11], 22, -1990404162);
		o = md5_ff(o, n, m, l, p[g + 12], 7, 1804603682);
		l = md5_ff(l, o, n, m, p[g + 13], 12, -40341101);
		m = md5_ff(m, l, o, n, p[g + 14], 17, -1502002290);
		n = md5_ff(n, m, l, o, p[g + 15], 22, 1236535329);
		o = md5_gg(o, n, m, l, p[g + 1], 5, -165796510);
		l = md5_gg(l, o, n, m, p[g + 6], 9, -1069501632);
		m = md5_gg(m, l, o, n, p[g + 11], 14, 643717713);
		n = md5_gg(n, m, l, o, p[g + 0], 20, -373897302);
		o = md5_gg(o, n, m, l, p[g + 5], 5, -701558691);
		l = md5_gg(l, o, n, m, p[g + 10], 9, 38016083);
		m = md5_gg(m, l, o, n, p[g + 15], 14, -660478335);
		n = md5_gg(n, m, l, o, p[g + 4], 20, -405537848);
		o = md5_gg(o, n, m, l, p[g + 9], 5, 568446438);
		l = md5_gg(l, o, n, m, p[g + 14], 9, -1019803690);
		m = md5_gg(m, l, o, n, p[g + 3], 14, -187363961);
		n = md5_gg(n, m, l, o, p[g + 8], 20, 1163531501);
		o = md5_gg(o, n, m, l, p[g + 13], 5, -1444681467);
		l = md5_gg(l, o, n, m, p[g + 2], 9, -51403784);
		m = md5_gg(m, l, o, n, p[g + 7], 14, 1735328473);
		n = md5_gg(n, m, l, o, p[g + 12], 20, -1926607734);
		o = md5_hh(o, n, m, l, p[g + 5], 4, -378558);
		l = md5_hh(l, o, n, m, p[g + 8], 11, -2022574463);
		m = md5_hh(m, l, o, n, p[g + 11], 16, 1839030562);
		n = md5_hh(n, m, l, o, p[g + 14], 23, -35309556);
		o = md5_hh(o, n, m, l, p[g + 1], 4, -1530992060);
		l = md5_hh(l, o, n, m, p[g + 4], 11, 1272893353);
		m = md5_hh(m, l, o, n, p[g + 7], 16, -155497632);
		n = md5_hh(n, m, l, o, p[g + 10], 23, -1094730640);
		o = md5_hh(o, n, m, l, p[g + 13], 4, 681279174);
		l = md5_hh(l, o, n, m, p[g + 0], 11, -358537222);
		m = md5_hh(m, l, o, n, p[g + 3], 16, -722521979);
		n = md5_hh(n, m, l, o, p[g + 6], 23, 76029189);
		o = md5_hh(o, n, m, l, p[g + 9], 4, -640364487);
		l = md5_hh(l, o, n, m, p[g + 12], 11, -421815835);
		m = md5_hh(m, l, o, n, p[g + 15], 16, 530742520);
		n = md5_hh(n, m, l, o, p[g + 2], 23, -995338651);
		o = md5_ii(o, n, m, l, p[g + 0], 6, -198630844);
		l = md5_ii(l, o, n, m, p[g + 7], 10, 1126891415);
		m = md5_ii(m, l, o, n, p[g + 14], 15, -1416354905);
		n = md5_ii(n, m, l, o, p[g + 5], 21, -57434055);
		o = md5_ii(o, n, m, l, p[g + 12], 6, 1700485571);
		l = md5_ii(l, o, n, m, p[g + 3], 10, -1894986606);
		m = md5_ii(m, l, o, n, p[g + 10], 15, -1051523);
		n = md5_ii(n, m, l, o, p[g + 1], 21, -2054922799);
		o = md5_ii(o, n, m, l, p[g + 8], 6, 1873313359);
		l = md5_ii(l, o, n, m, p[g + 15], 10, -30611744);
		m = md5_ii(m, l, o, n, p[g + 6], 15, -1560198380);
		n = md5_ii(n, m, l, o, p[g + 13], 21, 1309151649);
		o = md5_ii(o, n, m, l, p[g + 4], 6, -145523070);
		l = md5_ii(l, o, n, m, p[g + 11], 10, -1120210379);
		m = md5_ii(m, l, o, n, p[g + 2], 15, 718787259);
		n = md5_ii(n, m, l, o, p[g + 9], 21, -343485551);
		o = safe_add(o, j);
		n = safe_add(n, h);
		m = safe_add(m, f);
		l = safe_add(l, e)
	}
	return Array(o, n, m, l)
}
function md5_cmn(h, e, d, c, g, f) {
	return safe_add(bit_rol(safe_add(safe_add(e, h), safe_add(c, f)), g), d)
}
function md5_ff(g, f, k, j, e, i, h) {
	return md5_cmn((f & k) | ((~f) & j), g, f, e, i, h)
}
function md5_gg(g, f, k, j, e, i, h) {
	return md5_cmn((f & j) | (k & (~j)), g, f, e, i, h)
}
function md5_hh(g, f, k, j, e, i, h) {
	return md5_cmn(f ^ k ^ j, g, f, e, i, h)
}
function md5_ii(g, f, k, j, e, i, h) {
	return md5_cmn(k ^ (f | (~j)), g, f, e, i, h)
}
function safe_add(a, d) {
	var c = (a & 65535) + (d & 65535);
	var b = (a >> 16) + (d >> 16) + (c >> 16);
	return (b << 16) | (c & 65535)
}
function bit_rol(a, b) {
	return (a << b) | (a >>> (32 - b))
};


java版(代码来源:http://www.cnblogs.com/computer-lzy/archive/2011/04/28/2031649.html):

package md5;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/*
 * MD5 加密算法
*/
public class MD5 {
    
    // 全局数组
    private final static String[] strDigits = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

    public MD5() {
    }

    // 返回形式为数字跟字符串
    private static String byteToArrayString(byte bByte) {
        int iRet = bByte;
        // System.out.println("iRet="+iRet);
        if (iRet < 0) {
            iRet += 256;
        }
        int iD1 = iRet / 16;
        int iD2 = iRet % 16;
        return strDigits[iD1] + strDigits[iD2];
    }

    // 返回形式只为数字
    private static String byteToNum(byte bByte) {
        int iRet = bByte;
        System.out.println("iRet1=" + iRet);
        if (iRet < 0) {
            iRet += 256;
        }
        return String.valueOf(iRet);
    }

    // 转换字节数组为16进制字串
    private static String byteToString(byte[] bByte) {
        StringBuffer sBuffer = new StringBuffer();
        for (int i = 0; i < bByte.length; i++) {
            sBuffer.append(byteToArrayString(bByte[i]));
        }
        return sBuffer.toString();
    }

    public static String GetMD5Code(String strObj) {
        String resultString = null;
        try {
            resultString = new String(strObj);
            MessageDigest md = MessageDigest.getInstance("MD5");
            // md.digest() 该函数返回值为存放哈希值结果的byte数组
            resultString = byteToString(md.digest(strObj.getBytes()));
        } catch (NoSuchAlgorithmException ex) {
            ex.printStackTrace();
        }
        return resultString;
    }

    public static void main(String[] args) {
        MD5 getMD5 = new MD5();
        System.out.println(getMD5.GetMD5Code(getMD5.GetMD5Code("aaaaaa")));
    }
}



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