How to decrypt message with CryptoJS AES. I have a working Ruby example

This seems to work for me (writes decoded string to the console):

data = "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";
key = "2e35f242a46d67eeb74aabc37d5e5d05";

// Decode the base64 data so we can separate iv and crypt text.
var rawData = atob(data);
var iv = btoa(rawData.substring(0,16));
var crypttext = btoa(rawData.substring(16));

// Decrypt...
var plaintextArray = CryptoJS.AES.decrypt(
  {
    ciphertext: CryptoJS.enc.Base64.parse(crypttext),
    salt: ""
  },
  CryptoJS.enc.Hex.parse(key),
  { iv: CryptoJS.enc.Base64.parse(iv) }
);

// Convert hex string to ASCII.
// See https://stackoverflow.com/questions/11889329/word-array-to-string
function hex2a(hex) {
    var str = '';
    for (var i = 0; i < hex.length; i += 2)
        str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
    return str;
}

console.log(hex2a(plaintextArray.toString()));

The important bits are to specify no salt in your input and pass the key as a WordArray as jlvaquero says. There are probably some efficiency improvements to be made, e.g. I'm guessing there's an easier way to convert a string to a WordArray than going to base64 and back, but at least it successfully decodes. I lifted the hex2a function from StackOverflow question Word Array to String.

Edit: I figured out how to convert strings to WordArrays and vice-versa with CryptoJS so the extra base64 encode/decode and hex-to-ASCII function are not needed. Also it turns out the salt property need not be specified. This is more compact and efficient:

data = "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";
key = "2e35f242a46d67eeb74aabc37d5e5d05";

// Decode the base64 data so we can separate iv and crypt text.
var rawData = atob(data);
var iv = rawData.substring(0,16);
var crypttext = rawData.substring(16);

// Decrypt...
var plaintextArray = CryptoJS.AES.decrypt(
  { ciphertext: CryptoJS.enc.Latin1.parse(crypttext) },
  CryptoJS.enc.Hex.parse(key),
  { iv: CryptoJS.enc.Latin1.parse(iv) }
);

console.log(CryptoJS.enc.Latin1.stringify(plaintextArray));


encryptWithCryptoJS(plainText: string): string {
    const key = CryptoJS.enc.Utf8.parse("hf8685nfhfhjs9h8");
    const iv1 = CryptoJS.enc.Utf8.parse("hf8685nfhfhjs9h8");
    const encrypted = CryptoJS.AES.encrypt(plainText, key, {
        keySize: 16,
        iv: iv1,
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });

    return encrypted + "";
}

decryptionWithCryptoJS(cipher: string): string {
    const key = CryptoJS.enc.Utf8.parse("hf8685nfhfhjs9h8");
    const iv1 = CryptoJS.enc.Utf8.parse("hf8685nfhfhjs9h8");
    const plainText = CryptoJS.AES.decrypt(cipher, key, {
        keySize: 16,
        iv: iv1,
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });

    return plainText.toString(CryptoJS.enc.Utf8);
}

This works for decryption using javascript.

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/aes.js"></script>
var key = "2e35f242a46d67eeb74aabc37d5e5d05";
var data = CryptoJS.AES.encrypt("Message", key); // Encryption Part
var decrypted = CryptoJS.AES.decrypt(data, key).toString(CryptoJS.enc.Utf8); // Message

Guess I am a little late to the party.

Tags:

Javascript

Ruby

Aes

Cryptojs

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