PHP hash_pbkdf2() Function: Generating PBKDF2 Key Derivation
This article explains the PHP hash_pbkdf2() function, detailing its parameters, return values, and usage with a complete example that demonstrates how to derive a PBKDF2 key using a chosen hash algorithm, password, salt, iteration count, and output format.
The hash_pbkdf2() function in PHP generates a PBKDF2 (Password-Based Key Derivation Function 2) key derived from a given password and salt using a specified hash algorithm.
Parameters
algo : Name of the hash algorithm (e.g., md5 , sha256 , haval160,4 ). Supported algorithms can be listed via hash_algos() .
password : The password to be hashed.
salt : A random salt value used during the derivation.
iterations : Number of iterations to perform.
length : Desired length of the derived key. If raw_output is true , this is the byte length; if false , it is twice the byte length because the result is returned as a hexadecimal string.
raw_output : Set to true to receive raw binary data, or false to receive a lowercase hexadecimal string.
If length is set to 0 , the full output size of the selected algorithm is used.
Return Value
When raw_output is true , the function returns the raw binary digest; otherwise it returns the digest as a lowercase hexadecimal string.
Example
The above script generates a 20‑byte PBKDF2 key using SHA‑256, a random 16‑byte salt, and 1000 iterations, then outputs the result as a hexadecimal string. Sample output:
556b73a21e63c3e0e904Laravel Tech Community
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