It didn't work but later started working, again, dont know why Just wanted to let you know what could happen, and I really don't know if this is a bug Thanks, S. HTM IV , for details. It is important to use a cryptographic library correctly; a simple usage error, even when it produces results that can be unpacked at the other side, can render a strong algorithm completely useless.
The initialization vector must be permuted with a recoverable noise source an arbitrary md5 hash is acceptable, since it's just a fake OTP and its origin contents are wholly unimportant.
Passwords should be remade with a salted one-way hash md5 is again acceptable even though it's been damaged, since the only thing you could recover from a cracked md5 hash is the source data to generate the password, which is useless. It's important to use a sane block mode OFB is unsafe for almost all algorithms; never use it. Prefer CBC in all cases except where you need to deal with a degraded signal and cannot retransmit.
A correct usage example is actually pretty long and needs a lot of explanation, so I developed a safe wrapper library which doesn't constrain usage and which comments itself very heavily.
It's appropriate for use or for learning. You must use true random number generator. The order of encryption and authentication is very important! One of the existing answers to this question made this mistake; as do many cryptography libraries written in PHP. You should avoid implementing your own cryptography , and instead use a secure library written by and reviewed by cryptography experts. Update: PHP 7. For best security, update your systems to use PHP 7.
Both of the libraries linked above make it easy and painless to implement authenticated encryption into your own libraries. If you still want to write and deploy your own cryptography library, against the conventional wisdom of every cryptography expert on the Internet, these are the steps you would have to take.
Even if you follow the advice given here, a lot can go wrong with cryptography. Always have a cryptography expert review your implementation. If you are not fortunate enough to be personal friends with a cryptography student at your local university, you can always try the Cryptography Stack Exchange forum for advice.
If you need a professional analysis of your implementation, you can always hire a reputable team of security consultants to review your PHP cryptography code disclosure: my employer.
Don't encrypt passwords. You want to hash them instead, using one of these password-hashing algorithms:. Don't encrypt URL Parameters. It's the wrong tool for the job. One of the projects I've been working on is an encryption library called Halite , which aims to make libsodium easier and more intuitive.
If you're tempted to use a "password", stop right now. You need a random bit encryption key, not a human memorable password.
I strongly recommend just storing a randomly generated key for long-term use instead of any sort of password as the key or to derive the key. Note that you're adding extra work and could just use this constant as the key and save yourself a lot of heartache! Then use PBKDF2 like so to derive a suitable encryption key from your password rather than encrypting with your password directly. I'm late to the party, but searching for the correct way to do it I came across this page it was one of the top Google search returns, so I will like to share my view on the problem, which I consider it to be up to date at the time of writing this post beginning of 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. The storage requirements depend on the cipher and mode used; more about this later. The Password field will be hashed using a one-way password hash, Encryption Cipher and mode 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.
Encryption key A good encryption key is a binary blob that's generated from a reliable random number generator. Password hashing with PHP 5. Deleting an element from an array in PHP. How do I get PHP errors to display? How do I make a redirect in PHP? How do you use bcrypt for hashing passwords in PHP? Enumerations on PHP. How do I expire a PHP session after 30 minutes?
What is stdClass in PHP? It is therefore recommended to allocate characters for the column that may be used to store the hash in database. It returns true if the password and hash match, or false otherwise. PHP is a server-side scripting language designed specifically for web development.
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