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Learning Goal: I’m working on a cyber security question and need an explanation and answer to help me learn.Introduction:Blowfish is a symmetric-key block cipher that provides good encryption rate with no disclosed effective cryptanalysis. Blowfish uses 64-bit blocks and typically 128-bit keys; you can find a description of the Blowfish algorithm at https:// www.schneier.com/academic/blowfish/ and http://www.counterpane.com/ blowfish.html. In this assignment, you will use OpenSSL’s libcrypto to implement the Blowfish block cipher. You can find a current description of all the OpenSSL functions at https://www.openssl.org/docs/man1.1.1/man3/, but we will specifically be using the BF cbc encrypt, BF ecb encrypt, and BF set key functions, which are described at https://www.openssl.org/docs/man1.1.1/man3/BF_ encrypt.html. 2 Directions 2.1 CBC-mode Encryption/Decryption Using OpenSSL version 1.1.1k , implement the Blowfish block cipher for encryption and decryption using CBC mode of encryption in fscrypt.c. The two functions you will implement have the following signatures: void * fs_encrypt ( void * plaintext , int bufsize , char * keystr , int * resultlen ) ; void * fs_decrypt ( void * ciphertext , int bufsize , char * keystr , int * resultlen ) ; Implement the following functions in fscrypt2.c with the same functionality as above. However this time, only use BF cbc encrypt and BF set key. Note that you will have to modify the provided files (see below). void * fs_encrypt2 ( void * plaintext , int bufsize , char * keystr , int * resultlen ) ;void * fs_decrypt2 ( void * ciphertext , int bufsize , char * keystr , int * resultlen ) ;You will be provided with three files: – fscrypt.h, which contains a block size definition, and the two function prototypes. – main.c, which contains a driver program. – Makefile to compile the driver executable(s).2.2 Assumptions We will make the following design decisions and assumptions:– Use CBC mode of encryption and decryption. – Pad the buffer with null bytes so that the input is always a multiple of the block size. – The initialization vector must be comprised of all null characters. – Both functions must allocate the result buffer of at least the required size (using malloc() or new). – Both functions also return the number of valid bytes in the result buffer pointed to by resultlen. – The application “caller” code is responsible for subsequently freeing the buffer pointed to by plaintext or ciphertext, but not to free any of the “callee” locally-allocated buffers. We will check your code for memory leaks using Valgrind. 3 Examples abc@remote :~/project$ makeclang -g – Wall – O2 fscrypt . c main . c -o exec – lcrypto clang -g – Wall – O2 fscrypt2 . c main2 . c -o exec2 – lcrypto abc@remote :~/project$ ./ exec ” hello world ” ” top secret ” length after encryption = 16 ciphertext = 3 de8c0996489214b412cb350ecdd6fbc plaintext = hello world abc@remote :~/project$ ./ exec2 ” hello world ” ” top secret ” length after encryption = 16 ciphertext = 3 de8c0996489214b412cb350ecdd6fbc plaintext = hello world5 Submitting Work In addition to your file implementation, use a README.md file to document how to build the executable(s) exec and exec2, and how to execute the programs from the command line interface.– Instructions to build your executable for compiled languages using the Makefile. – Command line interface usage instructions for your implementation of exec and exec2. – Acknowledgements of assistance you received and citations for works to which you referred. Note that we will be building and testing your program on Remote, linking against the system-wide installation of libcrypto and including its headers. If you modified the Makefile for a local installation (see below), ensure you restore the Makefile as appropriate. Place all your files under one directory. Archive the contents of this directory do not include executable binaries or intermediate files – using the following command: tar -cvf .tar
Requirements: NA | Python

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