Prints the cipher suites available on a Windows machine

get-tls-cipher-suites.c

#include <stdio.h>

#include <Windows.h>
#include <bcrypt.h>
#include <ntstatus.h>

int main() {
    ULONG pcbBuffer = 0;
    CRYPT_CONTEXT_FUNCTIONS *pBuffer = NULL;
    NTSTATUS status = BCryptEnumContextFunctions(CRYPT_LOCAL, L"SSL", NCRYPT_SCHANNEL_INTERFACE, &pcbBuffer, &pBuffer);

    if (status != STATUS_SUCCESS) {
        exit(EXIT_FAILURE);
    }

    for (int i = 0; i < pBuffer->cFunctions; i++) {
        int cbMultiByte = WideCharToMultiByte(GetConsoleOutputCP(), 0, pBuffer->rgpszFunctions[i], -1, NULL, 0, NULL, NULL);
        char *pszMultiByte = malloc(cbMultiByte);
        WideCharToMultiByte(GetConsoleOutputCP(), 0, pBuffer->rgpszFunctions[i], -1, pszMultiByte, cbMultiByte, NULL, NULL);
        printf("%s\n", pszMultiByte);
        free(pszMultiByte);
    }
}