What are hashing algorithms in C++?

What are hashing algorithms in C++?

Hashing algorithms in C++ are functions that convert input data into a fixed-size string of characters, which is typically a hash code.

Can you give me an example of a hashing algorithm in C++?

Sure! A common example is the SHA-256 algorithm, which produces a 256-bit hash value.

How do I implement SHA-256 in C++?

You can use libraries like OpenSSL or Crypto++ to implement SHA-256 in C++. Would you like a code snippet?

Yes, please provide a code snippet for SHA-256.

Here's a simple example using OpenSSL:

#include <openssl/sha.h>
#include <iostream>
#include <iomanip>

void sha256(const std::string& str, unsigned char outputBuffer[SHA256_DIGEST_LENGTH]) {
    SHA256(reinterpret_cast<const unsigned char*>(str.c_str()), str.size(), outputBuffer);
}

int main() {
    std::string data = "Hello, World!";
    unsigned char hash[SHA256_DIGEST_LENGTH];
    sha256(data, hash);
    for(int i = 0; i < SHA256_DIGEST_LENGTH; i++) {
        std::cout << std::hex << std::setw(2) << std::setfill('0') << (int)hash[i];
    }
    return 0;
}

This will output the SHA-256 hash of "Hello, World!".