Реализация MD5 ?

#include <cstdio>
#include <cstring>
#include <Windows.h>
#include <Wincrypt.h>
 
int main()
{
    HCRYPTPROV hCryptProv;
    HCRYPTHASH hHash;
    if(CryptAcquireContext(&hCryptProv,NULL,NULL,PROV_RSA_FULL,0))
    {
        printf("Cryptographic provider initialized.\n");
    }
    else
    {
         printf("Acquisition of context failed.\n");
         exit(1);
    }
    if(CryptCreateHash(hCryptProv,CALG_MD5,0,0,&hHash))
    {
        printf("An empty hash object has been created. \n");
    }
    else
    {
        printf("Error during CryptBeginHash!\n");
        exit(1);
    }
    char data[] = "String to hash";
    if(CryptHashData(hHash, (BYTE*)data, strlen(data), 0))
    {
        printf("Hash data loaded. \n");
    }
    else
    {
        printf("Error during CryptHashData!\n");
        exit(1);
    }
    DWORD count = 0;
    if(!CryptGetHashParam(hHash, HP_HASHVAL, NULL, &count, 0))
    {
        printf("Error during CryptGetHashParam!\n");
        exit(1);
    }
    unsigned char* hash_value = static_cast<unsigned char*>(malloc(count + 1));
    ZeroMemory(hash_value, count + 1);
 
    if(!CryptGetHashParam(hHash, HP_HASHVAL, (BYTE*)hash_value, &count, 0))
    {
        printf("Error during CryptGetHashParam!\n");
        exit(1);
    }
    puts("Hash value is received");
    // Вывод на экран полученного хеш-значения
    puts("Hash value:");
    for(unsigned char const* p = hash_value; *p; ++p)
    {
        printf("%x", unsigned(*p));
    }
    if(hHash)
       CryptDestroyHash(hHash);
    if(hCryptProv)
       CryptReleaseContext(hCryptProv,0);
    return 0;
}

#include <iostream>
#include <Poco/MD5Engine.h>
 
int main()
{
    Poco::MD5Engine engine;
    engine.update("String to hash");
    Poco::DigestEngine::Digest d =  engine.digest();
    for(auto const& val : d)
    {
        std::cout << std::hex << unsigned(val);
    }
    return 0;
}