mcrypt_cbc() Function for CBC‑Mode Encryption and Decryption in PHP
This article explains the PHP mcrypt_cbc() function, detailing its two prototypes for different libmcrypt versions, the full parameter list—including optional IV—and the mode constants MCRYPT_ENCRYPT and MCRYPT_DECRYPT used for CBC‑mode cryptographic operations.
The mcrypt_cbc() function in PHP provides CBC‑mode encryption and decryption using the libmcrypt library.
Two prototypes exist: the first targets libmcrypt 2.2.x, while the second targets libmcrypt 2.4.x and newer versions.
The function signature is:
string mcrypt_cbc ( int $cipher, string $key, string $data, int $mode [, string $iv] )The $mode argument accepts either MCRYPT_ENCRYPT for encryption or MCRYPT_DECRYPT for decryption.
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