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