dinos80152/mega-links-decrypter.html

## mega-links-decrypter.html
<!--
Inspired by
https://gist.github.com/mndza/74736feb073fc6b65334#file-gistfile1-html
https://github.com/denysvitali/megadecrypter
https://gist.github.com/artjomb/7ef1ee574a411ba0dd1933c1ef4690d1
About Mega Links
http://megadownloaderapp.blogspot.com/2013/03/explaining-mega-links.html
-->
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Mega Link Decrypter</title>
</head>

<body>
    <header>
        <h1>Mega Link Decrypter</h1>
        <h2>Decipher <code>mega://(f)enc?</code> or <code>mega://(f)enc2?</code> links</h2>
    </header>
    <main>
        <section>
            <label for="link">Mega Link: </label>
            <input id="link" type="text" style="width:80%" placeholder="Paste link here, and then press enter or click Decrypt">
            <button id="decrypt">Decrypt</button>
        </section>
        <section style="margin-top:10px;">
            <label for="result">Original URL: </label>
            <a id="result" href="" target="_blank"></a>
            <span id="error" style="color:red"></span>
            <button id="copy" style="visibility: hidden">Copy</button>
            <input type="text" id="result-input" style="display: none;" />
        </section>
    </main>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/crypto-js.min.js"></script>
    <script>
        var result = document.getElementById("result");
        var error = document.getElementById("error");
        var copy = document.getElementById("copy");
        var resultInput = document.getElementById("result-input");
        var link = document.getElementById("link");
        var decrypt = document.getElementById("decrypt");

        // add event listeners
        decrypt.addEventListener("click", function (event) {
            error.innerHTML = "";
            result.innerHTML = "";
            copy.style.visibility = "hidden";
            try {
                originURL = decryptURL(link.value);
                result.innerHTML = originURL;
                result.href = originURL;
                resultInput.value = originURL;
                copy.style.visibility = "visible";
            } catch (e) {
                error.innerHTML = e.message;
            }
        });
        link.addEventListener("keyup", function (event) {
            event.preventDefault();
            if (event.keyCode === 13) {
                decrypt.click();
            }
        });
        copy.addEventListener("click", function (event) {
            resultInput.style.display = "block";
            resultInput.select()
            document.execCommand('copy')
            resultInput.style.display = "none";
        });

        // main
        // example:
        // version 1
        // mega://enc?sjh3hoftyW8m5MmJDKW1c4TApgdMHLa2t7vtGQnag8VhGElc7r2JMrOdLqX0qpGR-MIqFh0jjxR0-NlAKxAuTQ
        // mega://fenc?ahc5Kx7gP-41l8GlalamcPAq9GqCMIALVCUNgvmKLh8BOwFYBaxWRkN-vsHFmOwo
        // version 2
        // mega://enc2?VdFBBVBv_AUzfGCkXt_Qrw5pC0PjzWzj3trelIvZZ4fRNuVo5GVeyepiMWqNb08eQUOk1sBvU0UqXriiOnnaVw
        // mega://fenc2?6Bn4WcYTWhHDGfi7WnrnTwOukwhWy6Q1UPtKeARrrkL1Dt5Kyrt0w2XaCPYy9Htf
        var decryptURL = function (url) {
            var rootURL= "https://mega.nz/#";
            var isFolder = url.charAt(7) === "f" ? true : false;
            if (isFolder) {
                rootURL += "F"
            }
            var urlpatterns = {
                megadownloaderapp: {
                    regexp: new RegExp("mega://f?enc?\\?([A-Za-z0-9-_,]+)", 'i'),
                    process: megadownloaderappDecrypt
                },
                megadownloaderapp2: {
                    regexp: new RegExp("mega://f?enc2?\\?([A-Za-z0-9-_,]+)", 'i'),
                    process: megadownloaderappDecrypt2
                }
            };

            var pass = false
            for (pattern in urlpatterns) {
                var match = urlpatterns[pattern].regexp.exec(url);
                if (match != null) {
                    pass = true
                    str = urlpatterns[pattern].process(match[1]);
                    if (str !== "") {
                        return rootURL + str
                    }
                }
            }
            if (!pass) {
                throw new Error("Invalid Mega Link")
            }
            throw new Error("Decrypt Failed")
        };

        var megadownloaderappDecrypt2 = function (str) {
            var password = [237, 31, 76, 32, 11, 53, 19, 152, 6, 178, 96, 86, 59, 61, 56, 118, 240, 17, 180, 117, 15, 58, 26, 74, 94, 253, 11, 190, 103, 85, 75, 68];
            var iv = CryptoJS.enc.Hex.parse("79F10A01844A0B27FF5B2D4E0ED3163E");

            // Recover Base64 from encoded string
            var b64str = str;
            b64str += "==".substring((2 - b64str.length * 3) & 3);
            b64str = b64str.replace(new RegExp("-", 'g'), "+").replace(new RegExp("_", 'g'), "/").replace(new RegExp(",", 'g'), "");

            // Decoding step
            var encryptedText = CryptoJS.enc.Base64.parse(b64str);

            var byteArrayToWordArray = function (byteArray) {
                var wordArray = [], i;
                for (i = 0; i < byteArray.length; i++) {
                    wordArray[(i / 4) | 0] |= byteArray[i] << (24 - 8 * i);
                }
                return CryptoJS.lib.WordArray.create(wordArray, byteArray.length);
            }

            var key = byteArrayToWordArray(password)

            var aes = CryptoJS.algo.AES.createDecryptor(key, {
                mode: CryptoJS.mode.CBC,
                padding: CryptoJS.pad.Pkcs7,
                iv: iv
            });
            var decrypted = aes.finalize(encryptedText);

            // Helper function to convert hex to ASCII
            var hex2ascii = function (hex) {
                var str = '';
                for (var i = 0; i < hex.length; i += 2)
                    str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
                return str;
            }

            // Return final URI
            return hex2ascii(decrypted.toString());
        }

        var megadownloaderappDecrypt = function (str) {
            // Password is "k1o6Al-1kz¿!z05y", but System.Text.Encoding.ASCII.GetBytes in VB.NET replaces 8-bit characters with '?'
            var password = "k1o6Al-1kz?!z05y";

            // IV = {121, 241, 10, 1, 132, 74, 11, 39, 255, 91, 45, 78, 14, 211, 22, 62}
            var iv = CryptoJS.enc.Hex.parse("79F10A01844A0B27FF5B2D4E0ED3163E");

            while (password.length < 32) { password += "X"; } // 256 bit password padding

            // Recover Base64 from encoded string
            var b64str = str;
            b64str += "==".substring((2 - b64str.length * 3) & 3);
            b64str = b64str.replace(new RegExp("-", 'g'), "+").replace(new RegExp("_", 'g'), "/").replace(new RegExp(",", 'g'), "");

            // Decoding step
            var encryptedText = CryptoJS.enc.Base64.parse(b64str);
            var key = CryptoJS.enc.Utf8.parse(password);
            var aes = CryptoJS.algo.AES.createDecryptor(key, {
                mode: CryptoJS.mode.CBC,
                padding: CryptoJS.pad.Pkcs7,
                iv: iv
            });
            var decrypted = aes.finalize(encryptedText);

            // Helper function to convert hex to ASCII
            var hex2ascii = function (hex) {
                var str = '';
                for (var i = 0; i < hex.length; i += 2)
                    str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
                return str;
            }

            // Return final URI
            return hex2ascii(decrypted.toString());
        };
    </script>
</body>

</html>
	<!--
	Inspired by
	https://gist.github.com/mndza/74736feb073fc6b65334#file-gistfile1-html
	https://github.com/denysvitali/megadecrypter
	https://gist.github.com/artjomb/7ef1ee574a411ba0dd1933c1ef4690d1
	About Mega Links
	http://megadownloaderapp.blogspot.com/2013/03/explaining-mega-links.html
	-->
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Mega Link Decrypter</title>
	</head>

	<body>
	<header>
	<h1>Mega Link Decrypter</h1>
	<h2>Decipher <code>mega://(f)enc?</code> or <code>mega://(f)enc2?</code> links</h2>
	</header>
	<main>
	<section>
	<label for="link">Mega Link: </label>
	<input id="link" type="text" style="width:80%" placeholder="Paste link here, and then press enter or click Decrypt">
	<button id="decrypt">Decrypt</button>
	</section>
	<section style="margin-top:10px;">
	<label for="result">Original URL: </label>
	<a id="result" href="" target="_blank"></a>
	<span id="error" style="color:red"></span>
	<button id="copy" style="visibility: hidden">Copy</button>
	<input type="text" id="result-input" style="display: none;" />
	</section>
	</main>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/crypto-js.min.js"></script>
	<script>
	var result = document.getElementById("result");
	var error = document.getElementById("error");
	var copy = document.getElementById("copy");
	var resultInput = document.getElementById("result-input");
	var link = document.getElementById("link");
	var decrypt = document.getElementById("decrypt");

	// add event listeners
	decrypt.addEventListener("click", function (event) {
	error.innerHTML = "";
	result.innerHTML = "";
	copy.style.visibility = "hidden";
	try {
	originURL = decryptURL(link.value);
	result.innerHTML = originURL;
	result.href = originURL;
	resultInput.value = originURL;
	copy.style.visibility = "visible";
	} catch (e) {
	error.innerHTML = e.message;
	}
	});
	link.addEventListener("keyup", function (event) {
	event.preventDefault();
	if (event.keyCode === 13) {
	decrypt.click();
	}
	});
	copy.addEventListener("click", function (event) {
	resultInput.style.display = "block";
	resultInput.select()
	document.execCommand('copy')
	resultInput.style.display = "none";
	});

	// main
	// example:
	// version 1
	// mega://enc?sjh3hoftyW8m5MmJDKW1c4TApgdMHLa2t7vtGQnag8VhGElc7r2JMrOdLqX0qpGR-MIqFh0jjxR0-NlAKxAuTQ
	// mega://fenc?ahc5Kx7gP-41l8GlalamcPAq9GqCMIALVCUNgvmKLh8BOwFYBaxWRkN-vsHFmOwo
	// version 2
	// mega://enc2?VdFBBVBv_AUzfGCkXt_Qrw5pC0PjzWzj3trelIvZZ4fRNuVo5GVeyepiMWqNb08eQUOk1sBvU0UqXriiOnnaVw
	// mega://fenc2?6Bn4WcYTWhHDGfi7WnrnTwOukwhWy6Q1UPtKeARrrkL1Dt5Kyrt0w2XaCPYy9Htf
	var decryptURL = function (url) {
	var rootURL= "https://mega.nz/#";
	var isFolder = url.charAt(7) === "f" ? true : false;
	if (isFolder) {
	rootURL += "F"
	}
	var urlpatterns = {
	megadownloaderapp: {
	regexp: new RegExp("mega://f?enc?\\?([A-Za-z0-9-_,]+)", 'i'),
	process: megadownloaderappDecrypt
	},
	megadownloaderapp2: {
	regexp: new RegExp("mega://f?enc2?\\?([A-Za-z0-9-_,]+)", 'i'),
	process: megadownloaderappDecrypt2
	}
	};

	var pass = false
	for (pattern in urlpatterns) {
	var match = urlpatterns[pattern].regexp.exec(url);
	if (match != null) {
	pass = true
	str = urlpatterns[pattern].process(match[1]);
	if (str !== "") {
	return rootURL + str
	}
	}
	}
	if (!pass) {
	throw new Error("Invalid Mega Link")
	}
	throw new Error("Decrypt Failed")
	};

	var megadownloaderappDecrypt2 = function (str) {
	var password = [237, 31, 76, 32, 11, 53, 19, 152, 6, 178, 96, 86, 59, 61, 56, 118, 240, 17, 180, 117, 15, 58, 26, 74, 94, 253, 11, 190, 103, 85, 75, 68];
	var iv = CryptoJS.enc.Hex.parse("79F10A01844A0B27FF5B2D4E0ED3163E");

	// Recover Base64 from encoded string
	var b64str = str;
	b64str += "==".substring((2 - b64str.length * 3) & 3);
	b64str = b64str.replace(new RegExp("-", 'g'), "+").replace(new RegExp("_", 'g'), "/").replace(new RegExp(",", 'g'), "");

	// Decoding step
	var encryptedText = CryptoJS.enc.Base64.parse(b64str);

	var byteArrayToWordArray = function (byteArray) {
	var wordArray = [], i;
	for (i = 0; i < byteArray.length; i++) {
	wordArray[(i / 4) \| 0] \|= byteArray[i] << (24 - 8 * i);
	}
	return CryptoJS.lib.WordArray.create(wordArray, byteArray.length);
	}

	var key = byteArrayToWordArray(password)

	var aes = CryptoJS.algo.AES.createDecryptor(key, {
	mode: CryptoJS.mode.CBC,
	padding: CryptoJS.pad.Pkcs7,
	iv: iv
	});
	var decrypted = aes.finalize(encryptedText);

	// Helper function to convert hex to ASCII
	var hex2ascii = function (hex) {
	var str = '';
	for (var i = 0; i < hex.length; i += 2)
	str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
	return str;
	}

	// Return final URI
	return hex2ascii(decrypted.toString());
	}

	var megadownloaderappDecrypt = function (str) {
	// Password is "k1o6Al-1kz¿!z05y", but System.Text.Encoding.ASCII.GetBytes in VB.NET replaces 8-bit characters with '?'
	var password = "k1o6Al-1kz?!z05y";

	// IV = {121, 241, 10, 1, 132, 74, 11, 39, 255, 91, 45, 78, 14, 211, 22, 62}
	var iv = CryptoJS.enc.Hex.parse("79F10A01844A0B27FF5B2D4E0ED3163E");

	while (password.length < 32) { password += "X"; } // 256 bit password padding

	// Recover Base64 from encoded string
	var b64str = str;
	b64str += "==".substring((2 - b64str.length * 3) & 3);
	b64str = b64str.replace(new RegExp("-", 'g'), "+").replace(new RegExp("_", 'g'), "/").replace(new RegExp(",", 'g'), "");

	// Decoding step
	var encryptedText = CryptoJS.enc.Base64.parse(b64str);
	var key = CryptoJS.enc.Utf8.parse(password);
	var aes = CryptoJS.algo.AES.createDecryptor(key, {
	mode: CryptoJS.mode.CBC,
	padding: CryptoJS.pad.Pkcs7,
	iv: iv
	});
	var decrypted = aes.finalize(encryptedText);

	// Helper function to convert hex to ASCII
	var hex2ascii = function (hex) {
	var str = '';
	for (var i = 0; i < hex.length; i += 2)
	str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
	return str;
	}

	// Return final URI
	return hex2ascii(decrypted.toString());
	};
	</script>
	</body>

	</html>