A detailed description of hashing creation and validation methods in PHP5 _php tutorial

If you use the php5.5 version, we have a much simpler approach to hash creation and validation, and PHP 5.5 provides us with 4 functions: Password_get_info (), Password_hash (), Password_needs_rehash () , and Password_verify (), with the four of them we can quickly implement hash creation and validation.

The Password_hash () function is discussed first. This will be used as a hash value for creating a new password. It contains three parameters: password, hash algorithm, options. The first two items are required. You can use this function according to the following example:

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$password = ' Foo '; $hash = Password_hash ($password, Password_bcrypt); $2y$10$uoegxj09qznqskvpfxr61uwjpjbxvdh2kgjqvnodzjnglhs2wtwhu

You will notice that we do not add any options to this hash. The options available now are limited to two: cost and salt. Demon Add option you need to create an associative array.

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$options = [' cost ' = = 10, ' Salt ' = Mcrypt_create_iv (mcrypt_dev_urandom)];

After adding the option to the Password_hash () function, our hash value is changed, which makes it more secure.

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$hash = Password_hash ($password, Password_bcrypt, $options); $2y$10$jdj5jdewjdhsthv6sgviquprrhzngqsuetlk8iem0okh6hpycoo22

Now that the hash has been created, we can view the new hash with Password_get_info () worth the information. Password_get_info () requires a parameter--the hash value--and returns an associative array that contains the algorithm (the integer representation of the hash algorithm used), the algorithm name (the readable name of the hash algorithm used), and the option (which we use to create the hash-worthy option).

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Var_dump (Password_get_info ($hash)); /* Array (3) { ["Algo"]=> Int (1) ["AlgoName"]=> String (6) "Bcrypt" ["Options"]=> Array (1) { ["Cost"]=> Int (10) } }

* * First one is added to the Password Hashing API is Password_needs_rehash (), it accepts three parameters, hash, hash algorithm and options, the first two are required. Password_needs_rehash () is used to check whether a hash value was created using a specific algorithm and options. This is useful if your database is damaged and you need to adjust the hash. By using Password_needs_rehash () to check each hash value, we can see if the existing hash value matches the new parameter, only those values created with the old parameter are affected.

Finally, we've created our hash value, looked at how it was created, checked to see if it needed to be hashed, and now we need to verify it. To verify plain text to its hash value, we must use Password_verify (), which requires two parameters, a password and a hash value, and will return TRUE or FALSE. Let's check if we get the hashed to see if it's right.

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$authenticate = password_verify (' foo ', ' $2y$10$jdj5jdewjdhsthv6sgviquprrhzngqsuetlk8iem0okh6hpycoo22 '); TRUE $authenticate = password_verify (' Bar ', ' $2y$10$jdj5jdewjdhsthv6sgviquprrhzngqsuetlk8iem0okh6hpycoo22 '); FALSE

Cases

Example #1 password_verify () Example

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See the Password_hash () example to see where this came from. $hash = ' $2Y$07$BCRYPTREQUIRES22CHRCTE/VLQH0PIJTJXL.0T1XKA8PW9DMXTPOQ '; if (password_verify (' Rasmuslerdorf ', $hash)) { Echo ' Password is valid! '; } else { echo ' Invalid password. '; } ?> The above routines will output: Password is valid!

With this knowledge, you can quickly and securely create a hash password in the new version of PHP 5.5.0.

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