Encrypt actionscript decrypt php

Java applets or native mobile apps. Note: If you specifically need to add encrypted cookies powered by libsodium to your app, my employer Paragon Initiative Enterprises is developing a library called Halite that does all of this for you.

If you don't want to use a heavy dependency for something solvable in 15 lines of code, use the built in OpenSSL functions. Well, it's secure as long as you're following the best practices. IV is a public information and needs to be random for each message. The hash ensures that the data hasn't been tampered with. See a solution that works but is not secure! But there are other problems in this code which make it insecure, in particular the use of ECB which is not an encryption mode, only a building block on top of which encryption modes can be defined.

See Fab Sa's answer for a quick fix of the worst problems and Scott's answer for how to do this right. ECB mode divide your message into blocks and each block is encrypted separately. I really don't recommended it. CBC mode use the IV to make each message unique. You have to stock the IV to decode each message IV are not secret.

Each message is unique because each message has an unique IV. This is a working solution of AES encryption - implemented using openssl. Thus, alongside data and key , you can specify iv and block size. If the length of the string is less than 16, the decrypt function will return a string with length of 16 characters, adding 03 at the end.

Here's an improved version based on code written by blade. If you truly cannot have proper encryption and hash keys but have to use an user entered password as the only secret, you can do something like this:.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 11 years, 5 months ago. Active 4 months ago. Viewed k times. At first it looks very good but it wont work :- Does anyone know what the problem is?

Improve this question. Scott Arciszewski Andreas Prang Andreas Prang 2, 4 4 gold badges 22 22 silver badges 32 32 bronze badges. As the checked answer is considered badly broken and insecure, please move the accepted answer on this question. Add a comment. From PHP 7. Important : This uses ECB mode , which isn't secure.

If you want a simple solution without taking a crash course in cryptography engineering, don't write it yourself, just use a library. You can use any other chipper methods as well, depending on your security need. ECB is not an encryption mode, it's only a building block. Using ECB as demonstrated in this answer does not actually encrypt the string securely. Do not use ECB in your code. See Scott's answer for a good solution. I got it on myself. Actually i found some answer on google and just modified something.

The result is completely insecure however. If you are using Laravel framework then it's more easy to encrypt and decrypt with internal functions. Otherwise, encrypted values will not be secure.

PHP 7 ready version. This is what we call "legacy code" now. I have left this answer for historical purposes - but some of the methods are now deprecated, DES encryption method is not a recommended practice, etc. I have not updated this code for two reasons: 1 I no longer work with encryption methods by hand in PHP, and 2 this code still serves the purpose it was intended for: to demonstrate the minimum, simplistic concept of how encryption can work in PHP.

If you find a similarly simplistic, "PHP encryption for dummies" kind of source that can get people started in lines of code or less, let me know in comments. Ideally you have - or can get - access to the mcrypt PHP library, as its certainly popular and very useful a variety of tasks.

Here's a run down of the different kinds of encryption and some example code: Encryption Techniques in PHP. It's like rewiring a nuclear power station - accept that the task is dangerous and difficult and beyond your knowledge if that's the case.

The financial penalties can be immense, so better to use a service and ship responsibility to them. But seeing as how the key is stored in plain text on the web server, if they can get the data they can get the decryption key. The length of authentication tag lies between 4 to 16 for GCM mode. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Collectives on Stack Overflow. Learn more. Ask Question. Asked 8 years, 8 months ago. Active 7 days ago. Viewed k times. Improve this question. Scott Arciszewski Rogue He doesn't want a hash, he wants symmetric encryption like AES , he just doesn't know what it's called. And now he does : — Patashu. A key must be kept secret. This information needs to be passed to php. Since you don't want to transmit the password, you have to derive the key and IV in the same way in php.

The following code derives the key and IV from a password and salt. It is modeled after the code in my answer here for more information. The salt is generated during encryption in CryptoJS and needs to be sent to php with the ciphertext.

Before invoking evpKDF the salt has to be converted to a binary string from hex. If only encryptedPassword. Everything together is Baseencoded. Utf8 ; console. You can't decrypt with a random initialisation vector - you need to use the same IV the data was encrypted with. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 7 years ago. I found the solution only by manually going through the openssl source.

If the buffer is already a multiple of blockSize, you add an entire new blockSize bytes as padding. The value of the padding bytes MUST be the number of padding bytes as a byte So 5 bytes of padding will result in the following bytes added at the end of the ciphertext: [ 0x05 ][ 0x05 ][ 0x05 ][ 0x05 ][ 0x05 ] Hope this saves someone else a few hours of their life. Concise description about "options" parameter! Upgraded php and needed something to replace insecure legacy mcrypt libs, but still supported classic user, password interface.

There still seems to be some confusion about the "password" argument to this function. It accepts a binary string for the key ie. One of the posts says you should hex encode the key which is wrong , and some say you should hash the key but don't make it clear how to properly pass the hashed key. Note, that if you don't specify the Upon this, you can't use them to encrypt using null byte padding or to decrypt null byte padded data.

The developers of the wrapper forgot the padding scheme flags I believe this got fixed in 5. Contrary to some of the other comments here, I'm not certain that Password is indeed being improperly treated as the direct key. I say this because I've been passing random text values into this parameter which would be invalid as hex input. It seems to be hashing the password I provide, using what algorithm I do not know, because otherwise I'd expect it to throw an exception instead of working as expected.