function challenge() { var a = prompt("Encrypt/Decrypt (e/d):", "e"); // Encryption if (a === "e" || a === "E") { var b = prompt("Enter text to encrypt:", "SoloLearn"); var c = Math.ceil(b.length / 8); var e = [], f = [], g = ["U", "D", "L", "R"]; document.write("

Text: " + b + "

"); for (var d = 0; d < c; d++) { // Putting text in cubes e[d] = b.substr(d * 8, 8); while (e[d].length !== 8) e[d] += "_"; // Generating random rotations f[d] = ""; var h = 1 + Math.ceil(Math.random() * 4); for (var i = 0; i < h; i++) f[d] += g[Math.floor(Math.random() * 4)]; } var r = ""; for (var j = 0; j < c; j++) { document.write("

Cube " + j + ""); cube_display(e[j]); // Applying random rotations for (var k = 0; k < f[j].length; k++) { document.write("Rotation " + f[j][k] + ""); e[j] = cube_rotate(e[j], f[j][k]); cube_display(e[j]); } // Getting the result r += e[j].split("_").join(""); } alert("Text: " + b + "\n" + "Encrypted Text: " + r); document.write("

Encrypted Text: " + r + "

"); } // Decryption else { var b1 = prompt("Enter text to decrypt:", "earLoSoln"); var c1 = Math.ceil(b1.length / 8); var e1 = [], h1 = []; var f1 = prompt("Enter rotation sequence:", "0:L:D:D:L,1:U:R:L"); document.write("

Encrypted Text: " + b1 + "
Rotation Sequence: " + f1 + "

"); // Putting text in cubes for (var d1 = 0; d1 < c1; d1++) { e1[d1] = b1.substr(d1 * 8, 8); while (e1[d1].length !== 8) e1[d1] += "_"; } // Getting rotations var g1 = f1.split(","); for (var i1 = 0; i1 < g1.length; i1++) h1[i1] = g1[i1].split(":").join("").substr(1); var r1 = ""; for (var j1 = 0; j1 < c1; j1++) { document.write("

Cube " + j1 + ""); cube_display(e1[j1]); // Reversing rotations var reverse = function(dir) { switch (dir) { case "U": return "D"; case "D": return "U"; case "L": return "R"; case "R": return "L"; } }; for (var k1 = 0; k1 < h1[j1].length; k1++) { document.write("Reverse " + h1[j1][k1] + ""); e1[j1] = cube_rotate(e1[j1], reverse(h1[j1][k1])); cube_display(e1[j1]); } // Getting the result r1 += e1[j1].split("_").join(""); } alert("Encrypted Text: " + b1 + "\n" + "Rotation Sequence: " + f1 + "\n" + "Text: " + r1); document.write("

Text: " + r1 + "

"); } } // Cube Rotation function cube_rotate(str, dir) { var u = [4, 0, 3, 7, 5, 1, 2, 6]; var d = [1, 5, 6, 2, 0, 4, 7, 3]; var l = [3, 2, 6, 7, 0, 1, 5, 4]; var r = [4, 5, 1, 0, 7, 6, 2, 3]; var s = "", c; switch (dir) { // Up case "U": for (c = 0; c < 8; c++) s += str[u[c]]; break; // Down case "D": for (c = 0; c < 8; c++) s += str[d[c]]; break; // Left case "L": for (c = 0; c < 8; c++) s += str[l[c]]; break; // Right case "R": for (c = 0; c < 8; c++) s += str[r[c]]; break; } return s; } // Cube Visualization function cube_display(str) { document.write("

");
    document.write("   " + str[5] + "-----" + str[6] + "\n");
    document.write("  /|    /|\n");
    document.write(" / |   / |\n");
    document.write("" + str[1] + "-----" + str[2] + "  |\n");
    document.write("|  |  |  |\n");
    document.write("|  |  |  |\n");
    document.write("|  " + str[4] + "--|--" + str[7] + "\n");
    document.write("| /   | /\n");
    document.write("|/    |/\n");
    document.write("" + str[0] + "-----" + str[3] + "\n");
    document.write("

"); }

The Crypto-Cube (Challenge 100)