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mcrypt_enc_is_block_algorithm_mode(3) [php man page]

MCRYPT_ENC_IS_BLOCK_ALGORITHM_MODE(3)					 1				     MCRYPT_ENC_IS_BLOCK_ALGORITHM_MODE(3)

mcrypt_enc_is_block_algorithm_mode - Checks whether the encryption of the opened mode works on blocks

SYNOPSIS
bool mcrypt_enc_is_block_algorithm_mode (resource $td) DESCRIPTION
Tells whether the algorithm of the opened mode works on blocks (e.g. FALSE for stream, and TRUE for cbc, cfb, ofb).. PARAMETERS
o $td - The encryption descriptor. RETURN VALUES
Returns TRUE if the mode is for use with block algorithms, otherwise it returns FALSE. PHP Documentation Group MCRYPT_ENC_IS_BLOCK_ALGORITHM_MODE(3)

Check Out this Related Man Page

MCRYPT_DECRYPT(3)							 1							 MCRYPT_DECRYPT(3)

mcrypt_decrypt - Decrypts crypttext with given parameters

SYNOPSIS
string mcrypt_decrypt (string $cipher, string $key, string $data, string $mode, [string $iv]) DESCRIPTION
Decrypts the $data and returns the unencrypted data. PARAMETERS
o $cipher -One of the MCRYPT_ciphername constants, or the name of the algorithm as string. o $key - The key with which the data was encrypted. If the provided key size is not supported by the cipher, the function will emit a warning and return FALSE o $data - The data that will be decrypted with the given $cipher and $mode. If the size of the data is not n * blocksize, the data will be padded with ' '. o $mode -One of the MCRYPT_MODE_modename constants, or one of the following strings: "ecb", "cbc", "cfb", "ofb", "nofb" or "stream". o $iv -Used for the initialization in CBC, CFB, OFB modes, and in some algorithms in STREAM mode. If the provided IV size is not sup- ported by the chaining mode or no IV was provided, but the chaining mode requires one, the function will emit a warning and return FALSE. RETURN VALUES
Returns the decrypted data as a string or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.6.0 | | | | | | | Invalid $key and $iv sizes are no longer | | | accepted. mcrypt_decrypt(3) will now throw a | | | warning and return FALSE if the inputs are | | | invalid. Previously keys and IVs were padded with | | | ' ' bytes to the next valid size. | | | | +--------+---------------------------------------------------+ SEE ALSO
mcrypt_encrypt(3). PHP Documentation Group MCRYPT_DECRYPT(3)
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