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AES Encryption Java Invalid Key length


AES Encryption Java Invalid Key length

By : Zain Ul Ebad
Date : November 20 2020, 07:00 PM
I wish this help you For a stronger key strength encryption you would need to download Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files.
http://java.sun.com/javase/downloads/index.jsp (Check Other Downloads).
code :


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Java Encryption: Java Encription: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decryp

Java Encryption: Java Encription: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decryp


By : Ahmad Jonny Syazani
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Finely after lots of testing and crying :) , I've found what i was suspecting from the beginning.
When passing data through URL (POST\GET whatever) you must first URL-Encode it first on your client side before sending it, and URL-Decoding on the server side before processing it.
Encryption Failing with error Invalid length for a Base-64 char array or string

Encryption Failing with error Invalid length for a Base-64 char array or string


By : Will53
Date : March 29 2020, 07:55 AM
Hope this helps Fixed! It appears the error was a little misleading (or likely I was being stupid!) and it looks like it was NOT the plain text for encryption that was the cause of the exception but the password/passphrase.
I found another app I was using this method in and found the KEY was the problem. I was passing a plain text password in initially, then I changed this to a SHA-256 hash of the password when this was in fact not a valid key.
code :
            public static string AesKeyFromPassword(string password, int keySize = Keysize.SymmetricKeyLength)
        {
            byte[] passwordByteArray = CreateKey(password);

            var aesEncryption = new RijndaelManaged
            {
                KeySize = keySize,
                BlockSize = 128,
                Mode = CipherMode.CBC,
                Padding = PaddingMode.PKCS7,
                Key = passwordByteArray
            };

            aesEncryption.GenerateIV();
            string ivStr = Convert.ToBase64String(aesEncryption.IV);
            string keyStr = Convert.ToBase64String(aesEncryption.Key);
            string completeKey = ivStr + "," + keyStr;

            return Convert.ToBase64String(Encoding.UTF8.GetBytes(completeKey));
        }

        private static byte[] CreateKey(string password)
        {
            var salt = new byte[] { 1, 2, 23, 234, 37, 48, 134, 63, 248, 4 };

            const int Iterations = 9872;
            using (var rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, salt, Iterations))
                return rfc2898DeriveBytes.GetBytes(32);
        }
3des encryption in Node.JS returning invalid IV length

3des encryption in Node.JS returning invalid IV length


By : Alex Seaman
Date : March 29 2020, 07:55 AM
I wish this helpful for you I'm quite new to Node and have run into an issue with the encryption object: , From OP's edit:
SOLVED:
code :
var string_to_decode = "encrypted string";
var des_key = new Buffer("key string", "base64");
var des_iv = new Buffer(0);
var des_decryption = Crypto.createDecipheriv("DES-EDE3", des_key, des_iv);
var deciphered_string = des_decryption.update(string_to_decode, "base64", "utf8");
    console.log("["+string_to_decode+"] => ["+deciphered_string+"]");
Getting error of Invalid IV Length while using aes-256-cbc for encryption in node

Getting error of Invalid IV Length while using aes-256-cbc for encryption in node


By : Mbasooka Getrude
Date : March 29 2020, 07:55 AM
With these it helps From https://github.com/nodejs/node/issues/6696#issuecomment-218575039 -
code :
var ivstring = iv.toString('hex').slice(0, 16);
Bad PKCS7 padding. Invalid length 0. Python Encryption to C# Decryption

Bad PKCS7 padding. Invalid length 0. Python Encryption to C# Decryption


By : user3681629
Date : March 29 2020, 07:55 AM
it fixes the issue I'm trying to share data between a Xamarin/.Net/C# prgram and a python program using AES CBC. I'm able to encrypt a message in .Net and and decrypt that message in python successfully, but not vice versa. That is, when I encrypt in python first and try to decrypt that message in C#, I get the exception: "Bad PKCS7 padding. Invalid length 0" ,
code :
length = 16 - (len(textToEncrypt) % 16)
textToEncrypt += length * b'\0'
01
02 02
03 03 03
04 04 04 04
...
16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16
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