Program with OpenSSL encryption

Creating a program with finding secret key used in encryption, where plaintext, ciphertext and IV are given. Large amount of skeleton code provided in attachments. The program must: 1. Scan through a .txt file (provided) until a match is found. 2. Use each word to encrypt theplaintext. 3. Compare the encrypted text with the ciphertext bit by bit. 4. Find a match, based on which find the word used. 5. Display the found word, its ciphertext next to the ciphertext being searched for. 6. The length of the ciphertext.