mcrypt_generic_init

mcrypt_generic_init

This function initializes all buffers needed for encryption

int **mcrypt_generic_init** resource $td string $key string $iv

You need to call this function before every call to or . mcrypt_generic``mdecrypt_generic

tdThe encryption descriptor.

key The maximum length of the key should be the one obtained by calling and every value smaller than this is legal. mcrypt_enc_get_key_size

iv The IV should normally have the size of the algorithms block size, but you must obtain the size by calling . IV is ignored in ECB. IV MUST exist in CFB, CBC, STREAM, nOFB and OFB modes. It needs to be random and unique (but not secret). The same IV must be used for encryption/decryption. If you do not want to use it you should set it to zeros, but this is not recommended. mcrypt_enc_get_iv_size

The function returns a negative value on error: -3 when the key length was incorrect, -4 when there was a memory allocation problem and any other return value is an unknown error. If an error occurs a warning will be displayed accordingly. false is returned if incorrect parameters were passed.

mcrypt_module_open