CryptBinaryToString
...if you target to Windows platform
Here is a little sample:
#include <Windows.h>
#pragma comment(lib, "crypt32.lib")
int main()
{
LPCSTR pszSource = "Man is distinguished, not only by his reason, but ...";
DWORD nDestinationSize;
if (CryptBinaryToString(reinterpret_cast<const BYTE*> (pszSource), strlen(pszSource), CRYPT_STRING_BASE64, nullptr, &nDestinationSize))
{
LPTSTR pszDestination = static_cast<LPTSTR> (HeapAlloc(GetProcessHeap(), HEAP_NO_SERIALIZE, nDestinationSize * sizeof(TCHAR)));
if (pszDestination)
{
if (CryptBinaryToString(reinterpret_cast<const BYTE*> (pszSource), strlen(pszSource), CRYPT_STRING_BASE64, pszDestination, &nDestinationSize))
{
// Succeeded: 'pszDestination' is 'pszSource' encoded to base64.
}
HeapFree(GetProcessHeap(), HEAP_NO_SERIALIZE, pszDestination);
}
}
return 0;
}
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