r.nim

    {.push, stdcall, dynlib: "Advapi32.dll".}
    proc CryptReleaseContext*(
        hProv: HCRYPTPROV;
        dwFlags: culong
    ): cint {.importc: "CryptReleaseContext".}

    proc CryptAcquireContextA*(
        phProv: ptr HCRYPTPROV;
        szContainer: cstring;
        szProvider: cstring;
        dwProvType: culong;
        dwFlags: culong
    ): cint {.importc: "CryptAcquireContextA".}
                             
    proc CryptGenRandom*(
      hProv: HCRYPTPROV;
      dwLen: culong;
      pbBuffer: pointer
    ): cint {.importc: "CryptGenRandom".}
    {.pop.}