微信小程序MD5加密中文遇到的坑

àì夳堔傛蜴生んèń 2021-10-19 06:20 269阅读 0赞

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;
    };
     
    function md5(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();
    }
     
    module.exports.md5 = md5

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