Encrypt in JavaScript and Decrypt in C# With AES Algorithm in ASP.Net in MVC 4

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• PR

  Pandurang Rane3y agoPosted Dec 9, 2022, 12:07 PM

  How can we encrypt string in C#
• JP

  Jinesh Prajapati4y agoPosted Sep 15, 2022, 7:17 AM

  This project gives error while running
• U

  Uday4y agoPosted Mar 17, 2022, 12:36 PM

  Hi, thanks for the wonderful article! In "DecryptStringAES" method, do we need last line "string.Format(decriptedFromJavascript);" ? It is throwing "Input string was not in a correct format" error when plainText value contains "{" or "}".
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  Santhosh N4y agoPosted Mar 16, 2022, 2:32 PM

  Hello, Thank you so much for the blog. I really appreciate the effort.
• NM

  Nilesh Monde4y agoPosted Nov 26, 2021, 8:26 AM

  ;(function (root, factory, undef) { if (typeof exports === "object") { // CommonJS module.exports = exports = factory(require("./core"), require("./enc-base64"), require("./md5"), require("./evpkdf"), require("./cipher-core")); } else if (typeof define === "function" && define.amd) { // AMD define(["./core", "./enc-base64", "./md5", "./evpkdf", "./cipher-core"], factory); } else { // Global (browser) factory(root.CryptoJS); } }(this, function (CryptoJS) { (function () { // Shortcuts var C = CryptoJS; var C_lib = C.lib; var BlockCipher = C_lib.BlockCipher; var C_algo = C.algo; // Lookup tables var SBOX = []; var INV_SBOX = []; var SUB_MIX_0 = []; var SUB_MIX_1 = []; var SUB_MIX_2 = []; var SUB_MIX_3 = []; var INV_SUB_MIX_0 = []; var INV_SUB_MIX_1 = []; var INV_SUB_MIX_2 = []; var INV_SUB_MIX_3 = []; // Compute lookup tables (function () { // Compute double table var d = []; for (var i = 0; i < 256; i++) { if (i < 128) { d[i] = i << 1; } else { d[i] = (i << 1) ^ 0x11b; } } // Walk GF(2^8) var x = 0; var xi = 0; for (var i = 0; i < 256; i++) { // Compute sbox var sx = xi ^ (xi << 1) ^ (xi << 2) ^ (xi << 3) ^ (xi << 4); sx = (sx >>> 8) ^ (sx & 0xff) ^ 0x63; SBOX[x] = sx; INV_SBOX[sx] = x; // Compute multiplication var x2 = d[x]; var x4 = d[x2]; var x8 = d[x4]; // Compute sub bytes, mix columns tables var t = (d[sx] * 0x101) ^ (sx * 0x1010100); SUB_MIX_0[x] = (t << 24) | (t >>> 8); SUB_MIX_1[x] = (t << 16) | (t >>> 16); SUB_MIX_2[x] = (t << 8) | (t >>> 24); SUB_MIX_3[x] = t; // Compute inv sub bytes, inv mix columns tables var t = (x8 * 0x1010101) ^ (x4 * 0x10001) ^ (x2 * 0x101) ^ (x * 0x1010100); INV_SUB_MIX_0[sx] = (t << 24) | (t >>> 8); INV_SUB_MIX_1[sx] = (t << 16) | (t >>> 16); INV_SUB_MIX_2[sx] = (t << 8) | (t >>> 24); INV_SUB_MIX_3[sx] = t; // Compute next counter if (!x) { x = xi = 1; } else { x = x2 ^ d[d[d[x8 ^ x2]]]; xi ^= d[d[xi]]; } } }()); // Precomputed Rcon lookup var RCON = [0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36]; /** * AES block cipher algorithm. */ var AES = C_algo.AES = BlockCipher.extend({ _doReset: function () { var t; // Skip reset of nRounds has been set before and key did not change if (this._nRounds && this._keyPriorReset === this._key) { return; } // Shortcuts var key = this._keyPriorReset = this._key; var keyWords = key.words; var keySize = key.sigBytes / 4; // Compute number of rounds var nRounds = this._nRounds = keySize + 6; // Compute number of key schedule rows var ksRows = (nRounds + 1) * 4; // Compute key schedule var keySchedule = this._keySchedule = []; for (var ksRow = 0; ksRow < ksRows; ksRow++) { if (ksRow < keySize) { keySchedule[ksRow] = keyWords[ksRow]; } else { t = keySchedule[ksRow - 1]; if (!(ksRow % keySize)) { // Rot word t = (t << 8) | (t >>> 24); // Sub word t = (SBOX[t >>> 24] << 24) | (SBOX[(t >>> 16) & 0xff] << 16) | (SBOX[(t >>> 8) & 0xff] << 8) | SBOX[t & 0xff]; // Mix Rcon t ^= RCON[(ksRow / keySize) | 0] << 24; } else if (keySize > 6 && ksRow % keySize == 4) { // Sub word t = (SBOX[t >>> 24] << 24) | (SBOX[(t >>> 16) & 0xff] << 16) | (SBOX[(t >>> 8) & 0xff] << 8) | SBOX[t & 0xff]; } keySchedule[ksRow] = keySchedule[ksRow - keySize] ^ t; } } // Compute inv key schedule var invKeySchedule = this._invKeySchedule = []; for (var invKsRow = 0; invKsRow < ksRows; invKsRow++) { var ksRow = ksRows - invKsRow; if (invKsRow % 4) { var t = keySchedule[ksRow]; } else { var t = keySchedule[ksRow - 4]; } if (invKsRow < 4 || ksRow <= 4) { invKeySchedule[invKsRow] = t; } else { invKeySchedule[invKsRow] = INV_SUB_MIX_0[SBOX[t >>> 24]] ^ INV_SUB_MIX_1[SBOX[(t >>> 16) & 0xff]] ^ INV_SUB_MIX_2[SBOX[(t >>> 8) & 0xff]] ^ INV_SUB_MIX_3[SBOX[t & 0xff]]; } } }, encryptBlock: function (M, offset) { this._doCryptBlock(M, offset, this._keySchedule, SUB_MIX_0, SUB_MIX_1, SUB_MIX_2, SUB_MIX_3, SBOX); }, decryptBlock: function (M, offset) { // Swap 2nd and 4th rows var t = M[offset + 1]; M[offset + 1] = M[offset + 3]; M[offset + 3] = t; this._doCryptBlock(M, offset, this._invKeySchedule, INV_SUB_MIX_0, INV_SUB_MIX_1, INV_SUB_MIX_2, INV_SUB_MIX_3, INV_SBOX); // Inv swap 2nd and 4th rows var t = M[offset + 1]; M[offset + 1] = M[offset + 3]; M[offset + 3] = t; }, _doCryptBlock: function (M, offset, keySchedule, SUB_MIX_0, SUB_MIX_1, SUB_MIX_2, SUB_MIX_3, SBOX) { // Shortcut var nRounds = this._nRounds; // Get input, add round key var s0 = M[offset] ^ keySchedule[0]; var s1 = M[offset + 1] ^ keySchedule[1]; var s2 = M[offset + 2] ^ keySchedule[2]; var s3 = M[offset + 3] ^ keySchedule[3]; // Key schedule row counter var ksRow = 4; // Rounds for (var round = 1; round < nRounds; round++) { // Shift rows, sub bytes, mix columns, add round key var t0 = SUB_MIX_0[s0 >>> 24] ^ SUB_MIX_1[(s1 >>> 16) & 0xff] ^ SUB_MIX_2[(s2 >>> 8) & 0xff] ^ SUB_MIX_3[s3 & 0xff] ^ keySchedule[ksRow++]; var t1 = SUB_MIX_0[s1 >>> 24] ^ SUB_MIX_1[(s2 >>> 16) & 0xff] ^ SUB_MIX_2[(s3 >>> 8) & 0xff] ^ SUB_MIX_3[s0 & 0xff] ^ keySchedule[ksRow++]; var t2 = SUB_MIX_0[s2 >>> 24] ^ SUB_MIX_1[(s3 >>> 16) & 0xff] ^ SUB_MIX_2[(s0 >>> 8) & 0xff] ^ SUB_MIX_3[s1 & 0xff] ^ keySchedule[ksRow++]; var t3 = SUB_MIX_0[s3 >>> 24] ^ SUB_MIX_1[(s0 >>> 16) & 0xff] ^ SUB_MIX_2[(s1 >>> 8) & 0xff] ^ SUB_MIX_3[s2 & 0xff] ^ keySchedule[ksRow++]; // Update state s0 = t0; s1 = t1; s2 = t2; s3 = t3; } // Shift rows, sub bytes, add round key var t0 = ((SBOX[s0 >>> 24] << 24) | (SBOX[(s1 >>> 16) & 0xff] << 16) | (SBOX[(s2 >>> 8) & 0xff] << 8) | SBOX[s3 & 0xff]) ^ keySchedule[ksRow++]; var t1 = ((SBOX[s1 >>> 24] << 24) | (SBOX[(s2 >>> 16) & 0xff] << 16) | (SBOX[(s3 >>> 8) & 0xff] << 8) | SBOX[s0 & 0xff]) ^ keySchedule[ksRow++]; var t2 = ((SBOX[s2 >>> 24] << 24) | (SBOX[(s3 >>> 16) & 0xff] << 16) | (SBOX[(s0 >>> 8) & 0xff] << 8) | SBOX[s1 & 0xff]) ^ keySchedule[ksRow++]; var t3 = ((SBOX[s3 >>> 24] << 24) | (SBOX[(s0 >>> 16) & 0xff] << 16) | (SBOX[(s1 >>> 8) & 0xff] << 8) | SBOX[s2 & 0xff]) ^ keySchedule[ksRow++]; // Set output M[offset] = t0; M[offset + 1] = t1; M[offset + 2] = t2; M[offset + 3] = t3; }, keySize: 256/32 }); /** * Shortcut functions to the cipher's object interface. * * @example * * var ciphertext = CryptoJS.AES.encrypt(message, key, cfg); * var plaintext = CryptoJS.AES.decrypt(ciphertext, key, cfg); */ C.AES = BlockCipher._createHelper(AES); }()); return CryptoJS.AES; })); -- i am getting error at c.lib cannot read properties of undefined
• AA

  abu arqam4y agoPosted Oct 13, 2021, 1:00 PM

  Is there a way, we can generate dynamic key?
• AR

  ArunPrasad Ramasamy5y agoPosted Dec 25, 2020, 11:27 AM

  Its working fine only after i added the crypto-js.js, if we are not added means error throw like 'cryptojs is not defined'. Thanks,
• MM

  mahima maheshwari6y agoPosted Jul 6, 2020, 11:20 PM

  Is there any way to hide the key? I can read the key from javascript and decrypt the password.
  • AP

    Anand Palanidurai5y agoPosted Nov 3, 2020, 12:41 AM

    Hi I am also looking for the same, Is there any way to hide the key?
  • MS

    Mehul Savani5y agoPosted Nov 9, 2020, 4:56 AM

    Move code to server side and store into database directly
• DO

  Deborah Opeyemi6y agoPosted Jun 5, 2020, 6:39 AM

  Hello sir, the link to download the AES javascript is broken, how do I get it. thank
  • AR

    ArunPrasad Ramasamy5y agoPosted Dec 25, 2020, 11:08 AM

    Hi, You can download it from this link https://www.cdnpkg.com/crypto-js/file/aes.js/.
• VT

  venkat teja6y agoPosted May 22, 2020, 2:55 AM

  Hi I'm getting undefined in plaintext.
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  Lucky Laxman6y agoPosted Mar 3, 2020, 5:06 AM

  Perfect solution for UI Encrypt and class level Decrypt.
• SV

  santhi vanambhathina7y agoPosted Jul 24, 2019, 1:48 AM

  Hi Sir, while decrypting in api i am getting this error 'msDecrypt.ReadTimeout' threw an exception of type 'System.InvalidOperationException'
• NS

  Niranjan Swain7y agoPosted Dec 7, 2018, 12:32 AM

  Hi Sir, I have implement your code.when i use method name "DecryptStringAES" in c# each time getting "true" value but i am not getting proper value.Please help me.
  • NS

    Niranjan Swain7y agoPosted Dec 8, 2018, 11:49 PM

    Yes i have got my problem.i have sent to "true" value to encrypt.so that i am getting same value.
  • NS

    Niranjan Swain7y agoPosted Dec 8, 2018, 11:51 PM

    Thanks i have got a nice article.
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  Puneet Kankar8y agoPosted Sep 10, 2018, 4:53 AM

  Hi sir , In DecryptStringFromBytes method line number 41 using strat not proper.
• SR

  SUNANDA RANA8y agoPosted Mar 14, 2018, 10:08 AM

  Hi sir ....nice one..! I have implemented the above code and it successfully implemented also, but I want this encryption and decryption in .netcore environment can you please suggest me some idea or steps so that it can be easier for me
• TB

  Tridip Bhattacharjee8y agoPosted Feb 28, 2018, 3:34 AM

  What is the below code....need some explanation to understand below two line's objective. what is this line for keySize: 128 / 8, var key = CryptoJS.enc.Utf8.parse('8080808080808080'); var iv = CryptoJS.enc.Utf8.parse('8080808080808080');
• TB

  Tridip Bhattacharjee8y agoPosted Feb 28, 2018, 3:33 AM

  Sir please tell me why you choose AES algorithm...so many algo exist for encryption why AES ? any special reason.
• DT

  Dan Truong8y agoPosted Dec 4, 2017, 4:23 AM

  Is there any way to hide the key? I can read the key from javascript and decrypt the password
• HC

  Haribabu Chimata8y agoPosted Nov 14, 2017, 5:07 AM

  I am getting issue like: Invalid length for a Base-64 char array or string .. Please any one help on this
• J

  Jyoti9y agoPosted Oct 7, 2017, 1:12 AM

  I followed this article in my web application to encrypt the text using vs 2010 but same function when i am using in web api for decrypt the text which is encrypted in web application it gives me error 'msDecrypt.ReadTimeout error CS0103: The name 'msDecrypt' does not exist in the current context'. Thank you in advance
  • 

    Saineshwar Bageri9y agoPosted Oct 7, 2017, 1:25 PM

    What is scenario where u need encryption and decryption.
• IE

  Ignacio Elfi9y agoPosted Jun 14, 2017, 10:55 AM

  Perfect Article! Thank you Saineshwar!
• CB

  chetna balani9y agoPosted May 9, 2017, 5:53 AM

  How can i decrypt the value(encrypted in js) in JS
• AC

  Abraham Chaves9y agoPosted Nov 3, 2016, 1:28 PM

  Hi, It's possible to get "keyError" as a result?
• DT

  Deepak Tiwari10y agoPosted Jan 13, 2016, 4:11 AM

  When we are changing the value form "8080808080808080" to something else like "8684888184878784" in each side (client and server) it is throwing error. It seems it is fixed to this only.
  • 

    Saineshwar Bageri10y agoPosted Jan 13, 2016, 4:16 AM

    In Decrypt also you need to use same key which you have given in Encrypt Deepak Tiwari sir
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  Sai Sherlekar11y agoPosted Oct 9, 2015, 6:54 AM

  nice article, but i can read key from javascript and descrypt code
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  Yashwanth Muthineni11y agoPosted Aug 27, 2015, 3:17 AM

  Nice Share
• DM

  deepak mohanty11y agoPosted Aug 13, 2015, 9:02 AM

  Hi,
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  S.Ravi Kumar11y agoPosted Jun 2, 2015, 4:23 AM

  Nice Article
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  Rahul Kumar Saxena11y agoPosted Feb 28, 2015, 4:21 AM

  Good Show...