PHP mcrypt_decrypt() – Decrypt Ciphertext with Given Parameters
The PHP mcrypt_decrypt() function decrypts data using a specified cipher, key, mode, and optional initialization vector, returning the plaintext string or FALSE on failure, with detailed parameter descriptions and usage notes.
The PHP function mcrypt_decrypt() decrypts data using a specified cipher, key, mode, and optional initialization vector, returning the plaintext string or FALSE on failure.
Parameters
cipher – One of the MCRYPT_ciphername constants or a string name of the algorithm.
key – The encryption key; if its length is not supported by the chosen algorithm, a warning is issued and FALSE is returned.
data – The ciphertext to be decrypted; if its size is not a multiple of the block size, it is padded with '\0' to fill the final block.
mode – One of the MCRYPT_MODE_modename constants or a string such as "ecb", "cbc", "cfb", "ofb", "nofb", or "stream".
iv – Initialization vector required for CBC, CFB, OFB modes and some stream algorithms; missing or incorrectly sized IV triggers a warning and FALSE.
Return value – The decrypted data as a string, or FALSE on failure.
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