Cryptext blowfish11/9/2023 ![]() ![]() It would be both clearer and safer if crypt actually returned a failure like the documentation says it's supposed to, rather than accepting the "$" and defaulting to CRYPT_DES. The expanded key is then used to encrypt some text, and that encrypted text is the stored hash. Using invalid characters in the salt will cause crypt() to fail.īut here the "$" character clearly seems to be accepted by crypt() in both v5.2 and v5.4. bcrypt uses the EksBlowfishSetup which is the expansion key step function of the blowfish cipher, to expand your key into a proper cryptographic random key to use it. Standard DES-based hash with a two character salt from the alphabet "./0-9A-Za-z". This actually caused me a bit of confusion recently because the "$" character isn't valid salt input for CRYPT_DES as per the PHP crypt documentation, which says: It encrypts or decrypts the first 64 bits of in using the key key, putting. In theory, this might come in handy for backwards-compatibility if a CRYPT_BLOWFISH style salt was used in error on PHP 5.2. BFecbencrypt() is the basic Blowfish encryption and decryption func- tion. Blowfish is a keyed, symmetric cryptographic block cipher invented by Bruce Schneier in 1993 and located in the public domain. Ie: crypt('password', '$2y$10$NzRQNjTRfP4jXKvb4TCO.G') /* in PHP 5.2 */ The Blowfish encryption algorithm is a symmetric block cipher designed to achieve in the DES algorithm that was slow and uncertain. ![]() Interestingly, you can achieve the same result in later PHP versions with CRYPT_BLOWFISH support by simply truncating the salt to two characters. ![]() Notice that the output starts with "$2", which is the two character salt that CRYPT_DES chose from the salt input and prepended to the hash, and the output length matches the exact CRYPT_DES output length. Since crypt in PHP 5.2 doesn't support CRYPT_BLOWFISH, it is instead defaulting to interpreting the salt as a CRYPT_DES style salt. ![]()
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