/*?First?example:?Encrypts?stdin?to?stdout?using?TWOFISH?with?128?bit?key?and?CFB?*/

#include?
#include?
#include?
/*?#include??*/

main（）?{

??MCRYPT?td;
??int?i;
??char?*key;
??char?password[20];
??char?block_buffer;
??char?*IV;
??int?keysize=19;?/*?128?bits?*/

??key=calloc（1?keysize）;
??strcpy（password?“A_large_key“）;

/*?Generate?the?key?using?the?password?*/
/*??mhash_keygen（?KEYGEN_MCRYPT?MHASH_MD5?key?keysize?NULL?0?password?strlen（password））;
?*/
??memmove（?key?password?strlen（password））;

??td?=?mcrypt_module_open（“twofish“?NULL?“cfb“?NULL）;
??if?（td==MCRYPT_FAILED）?{
?????return?1;
??}
??IV?=?malloc（mcrypt_enc_get_iv_size（td））;

/*?Put?random?data?in?IV.?Note?these?are?not?real?random?data?
?*?consider?using?/dev/random?or?/dev/urandom.
?*/

??/*??srand（time（0））;?*/
??for?（i=0;?i????IV[i]=rand（）;
??}

??i=mcrypt_generic_init（?td?key?keysize?IV）;
??if?（i<0）?{
?????mcrypt_perror（i）;
?????return?1;
??}

??/*?Encryption?in?CFB?is?performed?in?bytes?*/
??while?（?fread?（&block_buffer?1?1?stdin）?==?1?）?{
??????mcrypt_generic?（td?&block_buffer?1）;

/*?Comment?above?and?uncomment?this?to?decrypt?*/
/*????mdecrypt_generic?（td?&block_buffer?1）;??*/

??????fwrite?（?&block_buffer?1?1?stdout）;
??}
??mcrypt_generic_deinit（td）;

??mcrypt_module_close（td）;

??return?0;

}

#if?0
/*?Second?Example:?encrypts?using?CBC?and?SAFER+?with?192?bits?key?*/

#include?
#include?
#include?

main（）?{

??MCRYPT?td;
??int?i;
??char?*key;?/*?created?using?mcrypt_gen_key?*/
??char?*block_buffer;
??char?*IV;
??int?blocksize;
??int?keysize?=?24;?/*?192?bits?==?24?bytes?*/


??key?=?calloc（1?keysize）;
??strcpy（key?“A_large_and_random_key“）;?

??td?=?mcrypt_module_open（“saferplus“?NULL?“cbc“?NULL）;

??blocksize?=?mcrypt_enc_get_block_size（td）;
??block_buffer?=?malloc（blocksize）;
/*?but?unfortunately?this?does?not?fill?all?the?key?so?the?rest?bytes?are
?*?padded?with?zeros.?Try?to?use?large?keys?or?convert?them?with?mcrypt_gen_key（）.
?*/

??IV=malloc（mcrypt_enc_get_iv_size（td））;

/*?Put?random?data?in?IV.?Note?these?are?not?real?random?data?
?*?consider?using?/dev/random?or?/dev/urandom.
?*/

/*?srand（time（0））;?*/
??for?（i=0;?i?????IV[i]=rand（）;
??}

??mcrypt_generic_init?（?td?key?keysize?IV）;

??/*?Encryption?in?CBC?is?performed?in?blocks?*/
??while?（?fread?（block_buffer?1?blocksize?stdin）?==?blocksize?）?{
??????mcrypt_generic?（td?block_buffer?blocksize）;
/*??????mdecrypt_generic?（td?block_buffer?blocksize）;?*/
??????fwrite?（?block_buffer?1?blocksize?stdout）;
??}
??mcrypt_generic_end?（td）;

??return?0;

}

#endif