DES

This document includes DES and 3DES functions.

Import

d = Import('des');

des

d.des(data, key, op);

Input:

• data - string value and its length % 8 must be 0.
• key - must be an integer value.
• op - a string value to indicate function to encrypt or decrypt. It only has two values: encode and decode.

Return value:

• an encrypted or decrypted string.

Error:

• If encounter an invalid argument, interpreter will throw an error and stop executing.

Example:

d = Import('des');
sys = Import('sys');

text = 'DES test'; //length is 8
cipher = d.des(text, 100, 'encode');
sys.print(cipher);
sys.print(d.des(cipher, 100, 'decode'));

The output is:

4xF???Q
DES test

des3

des3(data, key1, key2, op);

Input:

• data - string value and its length % 8 must be 0.
• key1, key2 - must be an integer value.
• op - a string value to indicate function to encrypt or decrypt. It only has two values: encode and decode.

Return value:

• an encrypted or decrypted string.

Error:

• If encounter an invalid argument, interpreter will throw an error and stop executing.

Example:

d = Import('des');
sys = Import('sys');

text = 'DES test'; //length is 8
cipher = d.des3(text, 100, 99, 'encode');
sys.print(cipher);
sys.print(d.des3(cipher, 100, 99, 'decode'));

The output is:

t?M??*?
DES test