Pike Manual

METHOD: crypt_block
SYNTAX: string o->crypt_block(string blocks);
DESCRIPTION: Encrypts or decrypts an even number of block, using the current key. If more than one block is given, they are encrypted/decrypted independently, i.e. in Electronic Code Book (ECB) mode.

METHOD: query_block_size
SYNTAX: int o->query_block_size();
DESCRIPTION: Returns the block size of the cipher, in octets. A typical block size is 8 octets. A string passed to crypt_block() must have a length that is a multiple of the block size.

METHOD: query_key_length
SYNTAX: int o->query_key_length();
DESCRIPTION: Returns the key size of the cipher, in octets. Note that some block ciphers, e.g. CAST128, have a variable key size. In this case, query_key_length returns the recommended key size, although keys of other lengths are accepted by the set_encrypt_key and set_decrypt_key methods. For DES, the real key length is seven octets (56 bits), but the DES standard mandates the use of parity bits. The query_key_length method lies about DES, and says that the key_size is eight octets (64 bits). See also des_parity.

METHOD: set_encrypt_key
SYNTAX: object o->set_encrypt_key(string key);
DESCRIPTION: Installs a key, and configures the object for doing encryption. For convenience, this method returns the object itself.

METHOD: set_decrypt_key
SYNTAX: object o->set_decrypt_key(string key);
DESCRIPTION: Installs a key, and configures the object for doing decryption. For convenience, this method returns the object itself.

The classes are

and

. To encrypt the block "Pike des" using the DES-key '0123456789abcdef' (in hex), use

Crypto.des()->set_encrypt_key(Crypto.hex_to_string("0123456789abcdef"))
                        ->crypt_block("Pike DES")

although most applications will not use the Crypto.des class directly.