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I need a c program that encrypt and decrypt txt files + makefile with DES(very important), the terminal commands for encryption will be ./main -e plain.txt key.txt cypher.txt and for decrypt ./main -d cypher.txt key.txt plain.txt (there is a pattern, function flag, the input file, key file and output file). Test: encrypt file with at list 10 lines of text, delete plain.txt content, run decrypt, and get the plain text back in the plain.txt file. no heigh level library are allowed, only basic libs! Thank you.
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