Encryption | simple way to encrypt and decrypt strings | Encryption library

The issue is that the key is not passed correctly in the CryptoJS code.

The posted Python code generates LefjQ2pEXmiy/nNZvEJ43i8hJuaAnzbA1Cbn1hOuAgA= as Base64-encoded key. This must be imported in the CryptoJS code using the Base64 encoder:

Edit:

On second thought, when creating the JceOpenSSLPKCS8DecryptorProviderBuilder, you're not explicitly specifying the provider:

In the encrypt() method the IV is not considered. As in aesEncrypt(), the IV must be passed and used when creating the AES object.
Furthermore there are bugs in the encoding: The plaintext must be UTF8 encoded and the ciphertext must be hex encoded:

You can use typing.get_args to get the arguments passed in to typing.Literal. In this case, you'll need to combine it with typing.cast so you can signal to "mypy" that the string value that the function returns is an acceptable Literal value.

For a Key Check Value (KCV) one generally uses single block encryption, without any mode such as ECB or CBC. As only a constant value of 16 bytes is used, there is no need for padding either.

If you just have a CBC class that performs ISO 9797-1 M2 padding then you could encrypt the static value of 01010101010101010101010101010101 (hex encoding of 16 bytes), using an all-zero IV and taking the first 16 bytes from the result (removing 16 bytes of ciphertext at the end that is just encryption of the mandatory padding).

As you can see in the image below, because the IV is all zero, the XOR with the plaintext leaves the input intact, basically making the first ciphertext identical to direct encryption with the block cipher.

By WhiteTimberwolf (SVG version) - PNG version, Public Domain, https://commons.wikimedia.org/w/index.php?curid=26434096

However, as you are using Java, it makes more sense to use a Cipher object using algorithm "AES/ECB/NoPadding" and use that to encrypt the value of 01010101010101010101010101010101 directly. ECB doesn't take an IV, so that problem is avoided. Also, no padding needs to be considered when "NoPadding" is specified.

If you need fewer bytes: those are usually taken from the left (lowest index) of the result.

Beware that these kinds of KCV's are somewhat dangerous as they show the ciphertext of one particular plaintext block. In the worst instances, this could lead to an adversary decrypting one ciphertext block, or for an authenticated scheme to lose its integrity/authentication properties.

Commonly KCV's are over an all-zero plaintext block. Using an all one-valued block makes the chance that this happens smaller, but that chance is still significant.

Both codes use the OpenSSL proprietary key derivation function EVP_BytesToKey() with an iteration count of 1 and MD5 as digest.
NodeJS does not use a salt, while CryptoJS applies a random salt. For this reason, the NodeJS result is unchanged for each encryption, while the CryptoJS result always changes (assuming the same plaintext and passphrase).

Thus, to get the result of the NodeJS code with the CryptoJS code, you must not use a salt. However, by default, a salt is always applied. This can only be circumvented by explicitly determining key and IV with the key derivation function EvpKDF and then using both in the encryption:

The reason is this breaking change:

DeflateStream, GZipStream, and CryptoStream diverged from typical Stream.Read and Stream.ReadAsync behavior in two ways:

They didn't complete the read operation until either the buffer passed to the read operation was completely filled or the end of the stream was reached.

And the new behaviour is:

Starting in .NET 6, when Stream.Read or Stream.ReadAsync is called on one of the affected stream types with a buffer of length N, the operation completes when:

At least one byte has been read from the stream, or The underlying stream they wrap returns 0 from a call to its read, indicating no more data is available.

In your case you are affected because of this code in Decrypt method:

According to the documentation of the JavaScript library the line

I got the solution by encrypting the key using bytes() Use the byte method to store the key in secured config file or database and encrypt the byte string to get the key. After that use any cipher method with suitable algorithm to encrypt the data and mask it.