iki64.js

function iki64_encode(data, key) {
    let keyLen = key.length;
    let az = 'abcdefghijklmnopqrstuvwxyz';
    let AZ = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    let rand = iki64_abc(key);
    let rand2 = iki64_ABCD(key);

    let one = btoa(data);
    let two = iki64_Encipher(one, keyLen);
    let three = two.replace(new RegExp(az.split('').join('|'), 'g'), match => rand[az.indexOf(match)]);
    let four = three.replace(new RegExp(AZ.split('').join('|'), 'g'), match => rand2[AZ.indexOf(match)]);

    return four;
}


function iki64_decode(data, key) {
    let keyLen = key.length;
    let az = 'abcdefghijklmnopqrstuvwxyz';
    let AZ = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    let rand = iki64_abc(key);
    let rand2 = iki64_ABCD(key);

    let four = data.replace(new RegExp(rand2.split('').join('|'), 'g'), match => AZ[rand2.indexOf(match)]);
    let three = four.replace(new RegExp(rand.split('').join('|'), 'g'), match => az[rand.indexOf(match)]);
    let two = iki64_Decipher(three, keyLen);
    let one = atob(two);

    return one;
}


function customMD5(data) {
    function rotateLeft(lValue, iShiftBits) {
        return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
    }

    function addUnsigned(lX, lY) {
        let 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(data) {
        let lWordCount;
        let lMessageLength = data.length;
        let lNumberOfWords_temp1 = lMessageLength + 8;
        let lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;
        let lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;
        let lWordArray = Array(lNumberOfWords - 1);
        let lBytePosition = 0;
        let lByteCount = 0;
        while (lByteCount < lMessageLength) {
            lWordCount = (lByteCount - (lByteCount % 4)) / 4;
            lBytePosition = (lByteCount % 4) * 8;
            lWordArray[lWordCount] = (lWordArray[lWordCount] | (data.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) {
        let 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;
    }

    let x = convertToWordArray(data);
    let a = 0x67452301;
    let b = 0xEFCDAB89;
    let c = 0x98BADCFE;
    let d = 0x10325476;
    let aa, bb, cc, dd;
    let S11 = 7,
        S12 = 12,
        S13 = 17,
        S14 = 22;
    let S21 = 5,
        S22 = 9,
        S23 = 14,
        S24 = 20;
    let S31 = 4,
        S32 = 11,
        S33 = 16,
        S34 = 23;
    let S41 = 6,
        S42 = 10,
        S43 = 15,
        S44 = 21;
    for (let 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);
    }
    let temp = wordToHex(a) + wordToHex(b) + wordToHex(c) + wordToHex(d);
    return temp.toLowerCase();
}


function iki64_Cipher(ch, key) {
    if (!/[a-zA-Z]/.test(ch))
        return ch;

    let offset = ch.toUpperCase() === ch ? 'A'.charCodeAt(0) : 'a'.charCodeAt(0);
    return String.fromCharCode((((ch.charCodeAt(0) + key) - offset) % 26) + offset);
}

function iki64_Encipher(input, key) {
    let output = "";

    for (let i = 0; i < input.length; i++)
        output += iki64_Cipher(input[i], key);

    return output;
}

function iki64_Decipher(input, key) {
    return iki64_Encipher(input, 26 - key);
}

function iki64_abc(data) {
    let md5 = customMD5(data + 'iki64');
    let az = 'abcdefghijklmnopqrstuvwxyz';
    let base64 = btoa(md5).toLowerCase() + az;
    let final = base64.replace(/[0-9|=]/g, '');
    let arr = [...new Set(final.split(''))];
    return arr.join('');
}

function iki64_ABCD(data) {
    let md5 = customMD5(data + '_iki64');
    let AZ = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    let base64 = btoa(md5).toUpperCase() + AZ;
    let final = base64.replace(/[0-9|=]/g, '');
    let arr = [...new Set(final.split(''))];
    return arr.join('');
}