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Encryption.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+#include <openssl/sha.h>
+#include <openssl/crypto.h>
+#include <openssl/evp.h>
+#include <sstream>
+#include <iomanip>
+using namespace std;
+string SHA256(const string str)
+{
+    unsigned char hash[SHA256_DIGEST_LENGTH]; // Initialize a new context for digest operations using the EVP API
+    EVP_MD_CTX *ctx = EVP_MD_CTX_new();
+    EVP_DigestInit_ex(ctx, EVP_sha256(), NULL); // Set up the context to use the SHA-256 algorithm
+    EVP_DigestUpdate(ctx, str.c_str(), str.size()); // Update the digest with the input string's bytes
+    EVP_DigestFinal_ex(ctx, hash, NULL); // Finish computing the hash and store it in the 'hash' buffer
+    EVP_MD_CTX_free(ctx); // Free up the context used for digest operations
+    stringstream ss;
+    for (int i = 0; i < SHA256_DIGEST_LENGTH; ++i) // Convert each byte of the hash into a two-digit hexadecimal number
+    ss << hex << setw(2) << setfill('0') << (int)hash[i];
+    return ss.str();
+}
+int main()
+{
+    string str;
+    cout << "Enter a string to encrypt: ";
+    getline(cin, str);
+    // Compute the SHA-256 hash of the input string
+    cout << "Encrypted string using SHA-256 algorithm: " << SHA256(str) << endl;
+    return 0;
+}

README.md

@@ -1,3 +1,7 @@
 # Sha256EncryptionInCpp
 
 Sha256 encryption program written in C++
+
+    Usage example:
+    cd "/VSCodeLibrary/C++/" && g++ Encryption.cpp -o Encryption -lssl -lcrypto && "/VSCodeLibrary/C++/"Encryption
+    Enter a string to encrypt: