Thank you guys for trying to help, indeed I posted the question lacking some informations (actually when the question was made I didn't have all the pieces of information I needed).
But posting here some facts and the solution encountered for my case.
The different results in the cases above only happen for the first PHP function ("encryptData"), responsible for encrypting small texts. The second, responsible for encrypting large texts (more than 16 bits) worked fine, both in PHP and JS scripts.
The solution I encountered was making the padding needed for the AES-256 algorithm by myself. The padding function provided by the Crypto lib didn't work, at least for my case.
So I disabled the padding in my cypher class and make sure that the data sent to be encrypted was padded correctly until the length is multiple of 16. The end's code is below.
encryptWithAES256(data) {
// added padding until data length is multiple of 16
let paddedData = data;
while (paddedData.length % 16 !== 0) {
paddedData += '\0';
}
// ciphers data
const cipher = crypto.createCipheriv('aes-256-cbc', encodeKey, IV);
cipher.setAutoPadding(false);
let crypted = cipher.update(paddedData, 'utf8', 'base64');
crypted += cipher.final('base64');
return crypted;
}
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
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