Php text encryption decryption

I am using the same key to decrypt, and passing true on the encode, as well as the decode. There is, what I assume is a typeo in the example, I am wondering if that is where my problem is coming from. Also, don't use libmcrypt. Neither 5. You should instead look into updating to a supported version of PHP , such a 5. BBeta paragonie. I just did it as a demonstration of you want binary strings, not human-readabale strings, for your keys.

Show 12 more comments. Community Bot 1 1 1 silver badge. EugenRieck Yes, that's the point. Mcrypt doesn't receive patches. OpenSSL receives patches as soon as any vulnerability is discovered, big or small. It deprecated since PHP 7. Since PHP 7 the mcrypt function is remove from php codebase. So when using the latest version of php which should be standard you are not able to use this deprecated function anymore.

You should also mention that Mcrypt has be depreciated since PHP 7. Show 1 more comment. EDIT 5 years and 4 months after this answer, the mcrypt extension is now in the process of deprecation and eventual removal from PHP.

Eugen Rieck Eugen Rieck Battle tested and not updated for more than 8 years? Well, mcrypt is in PHP7 and not deprecated - that's good enough for me. Not all code is of OpenSSL's horrible quality and needs patching every few days. It also doesn't implement best practices like PKCS 7 compliant padding, authenticated encryption. It won't support SHA-3 or any other new algorithm as nobody is maintaining it, robbing you of an upgrade path.

Furthermore it used to accept things like partial keys, performing zero padding etc. There is a good reason why it is in the process of being gradually removed from PHP.

In PHP 7. Add a comment. John 11k 11 11 gold badges 82 82 silver badges bronze badges. Harshal Lonare Harshal Lonare 2, 28 28 silver badges 36 36 bronze badges.

I couldn't get mine going until I realized this reading this link php. All your encryption needs can be basically resolved through Libsodium library. Hemerson Varela Hemerson Varela Some ciphers may not work on your version of PHP. The newer your version of PHP and its openssl extension , the more ciphers that will be available to you.

If you require assistance using this library start by viewing the HELP. It includes common problems and their solutions. If you need additional assistance, I can be found at Stack Overflow. Be sure when you ask a question pertaining to the usage of this library be sure to tag your question with the PHP and encryption tags.

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Documentation phpunit. Documentation Idaeswrappad. Documentation Idaesccm. Documentation Idsmimealgcms3deswrap. Tags : php security encryption cryptography encryption-symmetric php. Choosing the best encryption cipher and mode is beyond the scope of this answer, but the final choice affects the size of both the encryption key and initialisation vector; for this post we will be using AESCBC which has a fixed block size of 16 bytes and a key size of either 16, 24 or 32 bytes.

A good encryption key is a binary blob that's generated from a reliable random number generator. This can be done once or multiple times if you wish to create a chain of encryption keys. Keep these as private as possible. The initialisation vector adds randomness to the encryption and required for CBC mode. These values should be ideally be used only once technically once per encryption key , so an update to any part of a row should regenerate it.

You can further improve the integrity of the generated cipher text by appending a signature that's generated from a secret key different from the encryption key and the cipher text. Before the cipher text is decrypted, the signature is first verified preferably with a constant-time comparison method. Storing a reversible password in your database must be avoided as much as possible; you only wish to verify the password rather than knowing its contents.

If a user loses their password, it's better to allow them to reset it rather than sending them their original one make sure that password reset can only be done for a limited time.

Applying a hash function is a one-way operation; afterwards it can be safely used for verification without revealing the original data; for passwords, a brute force method is a feasible approach to uncover it due to its relatively short length and poor password choices of many people.

They're greatly optimized to make this verification as fast as possible while still being accurate. Given their relatively limited output space it was easy to build a database with known passwords and their respective hash outputs, the rainbow tables. Adding a salt to the password before hashing it would render a rainbow table useless, but recent hardware advancements made brute force lookups a viable approach.