SHA256.cpp

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#include <openssl/sha.h>
 
#include <string>
#include <vector>
#include <cstring>
 
#include <minitscript/minitscript.h>
#include <minitscript/utilities/SHA256.h>
 
using minitscript::utilities::SHA256;
 
using std::string;
using std::vector;
 
void SHA256::encode(const string& decodedString, string& encodedString) {
    hash((const uint8_t*)decodedString.data(), decodedString.size(), encodedString);
}
 
void SHA256::encode(const vector<uint8_t>& decodedData, string& encodedString) {
    hash(decodedData.data(), decodedData.size(), encodedString);
}
 
inline void SHA256::hash(const uint8_t* data, size_t size, string& encodedString) {
    // see: https://stackoverflow.com/questions/2262386/generate-sha256-with-openssl-and-c
    // check this later: https://stackoverflow.com/questions/34289094/alternative-for-calculating-sha256-to-using-deprecated-openssl-code
    unsigned char hash[SHA256_DIGEST_LENGTH];
    SHA256_CTX sha256;
    SHA256_Init(&sha256);
    SHA256_Update(&sha256, data, size);
    SHA256_Final(hash, &sha256);
    char outputBuffer[SHA256_DIGEST_LENGTH * 2 + 1];
    outputBuffer[SHA256_DIGEST_LENGTH * 2] = 0;
    for (int64_t i = 0; i < SHA256_DIGEST_LENGTH; i++) {
        snprintf(outputBuffer + (i * 2), 3, "%02x", hash[i]);
    }
    encodedString = string(outputBuffer, SHA256_DIGEST_LENGTH * 2);
}