Develop a program in C 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 with support of the following Command:

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).

The initial plaintext file "plain.txt" should content:

AAAAAAAAAAAAAABBBBBBBBBBBBBBBDDDDDDDDDDDDDDCCCCCCCCCCCCCFFFFFFFFFFFFF

keyfile.txt should content:

0f1571c947d9e859