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algo. Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..). For a list of supported algorithms see hash_algos(). · data. Message to be $key = hash('sha256', $secret_key);. A single pass of SHA-256 is not a strong KDF. You want hash_pbkdf2() if you're going to use aCRYPT_SHA256 - SHA-256 hash with a sixteen character salt prefixed with $5$. Note: There is no decrypt function, since crypt() uses a one-way algorithm. Tool to decrypt/encrypt SHA-256. The SHA-256 hash is the US federal standard that matches an hexadecimal 64-character fingerprint to an original binary data SHA256 is a hashing function, not an encryption function. Secondly, since SHA256 is not an encryption function, it cannot be decrypted. In that case, SHA256