Javascript crypto SJCL GCM not decrypting what I encrypted

Javascript crypto SJCL GCM not decrypting what I encrypted

By : Zongyao Fan
Date : November 22 2020, 11:17 AM
hope this fix your issue I think your problem is sjcl.codec.bytes.toBits(plaintext). If you run that by itself, you get [0,0,0]. I think you want sjcl.codec.utf8String.toBits(plaintext) instead.
You would use bytes.toBits if you have an actual byte (octet) array (like [255, 34, 12, 16]), but in this case you're using a string so it needs to be converted differently.
code :

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javax.crypto.IllegalBlockSizeException: last block incomplete in decryption - Decrypting an encrypted AES String

javax.crypto.IllegalBlockSizeException: last block incomplete in decryption - Decrypting an encrypted AES String

By : John Robinson
Date : March 29 2020, 07:55 AM
I wish this help you You should decode the string instead of encoding the platform specific representation of the string, right at the start of your method.
code :
byte[] base64TextToDecrypt = Base64.decodeBase64(textToDecrypt);
byte[] bytesToDecrypt = Base64(base64TextToDecrypt);
String plainText = new String(converted, StandardCharsets.UTF_8);
Need help decrypting an AES encrypted string with Javascript (using crypto-js)

Need help decrypting an AES encrypted string with Javascript (using crypto-js)

By : DisplayName=
Date : March 29 2020, 07:55 AM
This might help you From this, it seems the following should work:
code :
document.getElementById("decode").innerHTML = decrypted.toString(CryptoJS.enc.Utf8)
Nodejs Crypto encrypted string not decrypting correctly after storing in MySQL

Nodejs Crypto encrypted string not decrypting correctly after storing in MySQL

By : Lukas
Date : March 29 2020, 07:55 AM
like below fixes the issue I believe this is happening because you're using a different IV (Initialization Vector) each time.
The encryptionHelper function getKeyAndIV creates a random IV each time you call it, so decryption will not be deterministic.
code :
create table tokens (encryptedToken varchar(255))
const encryptionHelper = require("./simple-nodejs-iv-encrypt-decrypt.js")

// This could be anything
const token = "abcdefghijklmonp";

// We're using fixed values here. In reality you could use a different IV for each row, it's ok to store this in the database.
const key = Buffer.from("MTIzNDU2Nzg5MGFiY2RlZmdoaWprbG1ub3BxcnN0dXY=", "base64");
const iv =  Buffer.from("26vFZGhH66xFszo59pEaWA==", "base64");

const encryptedToken =  encryptionHelper.encryptText(encryptionHelper.CIPHERS.AES_256, key, iv, token, "base64");

// con should be initialized with a connection to the relevant db.
con.query("insert into tokens (encryptedToken) values (?)", [encryptedToken ], (error, results) => {
    if (error) {
        console.error("Insert query failed: ", error);
    } else {
        console.log("Token insert successful!");


con.query("select * from tokens", (error, results) => {
    if (error) {
        console.error("Select query failed: ", error);

    console.log("Tokens (encrypted):", results.map(r => r.encryptedToken));
    console.log("Tokens (decrypted):", results.map(r => encryptionHelper.decryptText(encryptionHelper.CIPHERS.AES_256, key, iv, r.encryptedToken, "base64").toString("base64")));

// Let's just ensure con is closed
setTimeout(() => {
}, 100);
Decrypting AES encrypted in C# with crypto-js

Decrypting AES encrypted in C# with crypto-js

By : Alex Alexy
Date : March 29 2020, 07:55 AM
may help you . Perhaps CryptoJS docs don't mention this explicitly enough, but in order for the crypto algorithm of your choice (AES in your case) to use the exact key and IV you provide they must be passed in as a CJS type WordArray.
One way to get the word arrays is to use parse methods of an encoding of your choice:
Decrypting SJCL encrypted strings in Android

Decrypting SJCL encrypted strings in Android

By : afshan hoseinpoor
Date : March 29 2020, 07:55 AM
Any of those help While this isn't done in Java, it is in fact done in Android. I know it's not the solution I wanted but it works and is a solution.
You can use a WebView to run the SJCL in Android to decrypt the file. You need an interface that the WebView JavaScript can talk to.
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