jQuery MD5插件

最新推荐文章于 2025-05-12 01:13:36 发布
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这是一个使用JavaScript实现的jQuery MD5插件，包含了MD5算法的关键函数，如FF、GG、HH、II以及字节转换、UTF8编码等步骤，用于对字符串进行加密。
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(function($) {

	var rotateLeft = function(lValue, iShiftBits) {
		return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
	};

	var addUnsigned = function(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);
		}
	};

	var F = function(x, y, z) {
		return (x & y) | ((~x) & z);
	};

	var G = function(x, y, z) {
		return (x & z) | (y & (~z));
	};

	var H = function(x, y, z) {
		return (x ^ y ^ z);
	};

	var I = function(x, y, z) {
		return (y ^ (x | (~z)));
	};

	var FF = function(a, b, c, d, x, s, ac) {
		a = addUnsigned(a, addUnsigned(addUnsigned(F(b, c, d), x), ac));
		return addUnsigned(rotateLeft(a, s), b);
	};

	var GG = function(a, b, c, d, x, s, ac) {
		a = addUnsigned(a, addUnsigned(addUnsigned(G(b, c, d), x), ac));
		return addUnsigned(rotateLeft(a, s), b);
	};

	var HH = function(a, b, c, d, x, s, ac) {
		a = addUnsigned(a, addUnsigned(addUnsigned(H(b, c, d), x), ac));
		return addUnsigned(rotateLeft(a, s), b);
	};

	var II = function(a, b, c, d, x, s, ac) {
		a = addUnsigned(a, addUnsigned(addUnsigned(I(b, c, d), x), ac));
		return addUnsigned(rotateLeft(a, s), b);
	};

	var convertToWordArray = function(string) {
		var lWordCount;
		var lMessageLength = string.length;
		var lNumberOfWordsTempOne = lMessageLength + 8;
		var lNumberOfWordsTempTwo = (lNumberOfWordsTempOne - (lNumberOfWordsTempOne % 64)) / 64;
		var lNumberOfWords = (lNumberOfWordsTempTwo + 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] | (string.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;
	};

	var wordToHex = function(lValue) {
		var WordToHexValue = "", WordToHexValueTemp = "", lByte, lCount;
		for (lCount = 0; lCount <= 3; lCount++) {
			lByte = (lValue >>> (lCount * 8)) & 255;
			WordToHexValueTemp = "0" + lByte.toString(16);
			WordToHexValue = WordToHexValue + WordToHexValueTemp.substr(WordToHexValueTemp.length - 2, 2);
		}
		return WordToHexValue;
	};

	var uTF8Encode = function(string) {
		string = string.replace(/\x0d\x0a/g, "\x0a");
		var output = "";
		for ( var n = 0; n < string.length; n++) {
			var c = string.charCodeAt(n);
			if (c < 128) {
				output += String.fromCharCode(c);
			} else if ((c > 127) && (c < 2048)) {
				output += String.fromCharCode((c >> 6) | 192);
				output += String.fromCharCode((c & 63) | 128);
			} else {
				output += String.fromCharCode((c >> 12) | 224);
				output += String.fromCharCode(((c >> 6) & 63) | 128);
				output += String.fromCharCode((c & 63) | 128);
			}
		}
		return output;
	};

	$.extend({
		md5 : function(string) {
			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;
			string = uTF8Encode(string);
			x = convertToWordArray(string);
			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 tempValue = wordToHex(a) + wordToHex(b) + wordToHex(c) + wordToHex(d);
			return tempValue.toLowerCase();
		}
	});
})(jQuery);