2. Programming with ciphers of OpenSSL (80 points) A. You need to develop 2 C programs DES_ECB_Enc.c and DES_ECB_Dec.c that use the ECB mode DES cipher in OpenSSL to encrypt or decrypt a given file (of arbitrary length) into another encrypted or the decrypted file with any given encryption key and IV. Specifically, the programs need to support the following commands line arguments and usage: DES_ECB_Enc k -i -o DES_ECB_Dec k -i -o where contains the 32-byte encryption key in hex format; contains the 8-byte IV in hex format; is the name of the input file (e.g., plaintext or cipertext); is the name of the output file (e.g., cipher text or plaintext). Note: and are text files, could be either text or binary file; is a binary file. The programs need to do basic sanity check on , , and gracefully exit when any illegitimate file is found (e.g., the does not contain 8 bytes in hex).