Calculating MD5 Hash from a File in C
In scenarios where safeguarding data integrity is critical, the MD5 hash algorithm plays a vital role. To compute the MD5 hash of a file in C , here's a robust implementation utilizing OpenSSL:
Implementation:
#include <fstream> #include <openssl> int main() { // Open the file std::ifstream file("input_file.txt"); // Create a buffer to store the file contents std::vector<char> buffer(std::istreambuf_iterator<char>(file), {}); // Calculate the MD5 hash unsigned char hash[MD5_DIGEST_LENGTH]; MD5((unsigned char*) buffer.data(), buffer.size(), hash); // Convert the hash to a string std::stringstream ss; for (int i = 0; i <p>This implementation opens the file, reads its contents into a buffer, and calculates the MD5 hash using the OpenSSL library. The hash is then converted to a hexadecimal string and displayed.</p></char></char></openssl></fstream>
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