1#include "tpm.h"
 2#include "common/library.h"
 3
 4#include <windef.h>
 5#include <tbs.h>
 6#include <winerror.h>
 7
 8const char* ffDetectTPM(FFTPMResult* result) {
 9    FF_LIBRARY_LOAD_MESSAGE(tbs, "TBS" FF_LIBRARY_EXTENSION, -1)
10    FF_LIBRARY_LOAD_SYMBOL_MESSAGE(tbs, Tbsi_GetDeviceInfo)
11
12    TPM_DEVICE_INFO deviceInfo = {};
13    TBS_RESULT code = ffTbsi_GetDeviceInfo(sizeof(deviceInfo), &deviceInfo);
14    if (code != TBS_SUCCESS) {
15        return code == (TBS_RESULT) TBS_E_TPM_NOT_FOUND ? "TPM device is not found" : "Tbsi_GetDeviceInfo() failed";
16    }
17
18    switch (deviceInfo.tpmVersion) {
19        case TPM_VERSION_12:
20            ffStrbufSetStatic(&result->version, "1.2");
21            break;
22        case TPM_VERSION_20:
23            ffStrbufSetStatic(&result->version, "2.0");
24            break;
25        default:
26            ffStrbufSetStatic(&result->version, "unknown");
27            break;
28    }
29
30    switch (deviceInfo.tpmInterfaceType) {
31        case TPM_IFTYPE_1:
32            ffStrbufSetF(&result->description, "I/O-port or MMIO TPM %s", result->version.chars);
33            break;
34        case TPM_IFTYPE_TRUSTZONE:
35            ffStrbufSetF(&result->description, "Trustzone TPM %s", result->version.chars);
36            break;
37        case TPM_IFTYPE_HW:
38            ffStrbufSetF(&result->description, "HW TPM %s", result->version.chars);
39            break;
40        case TPM_IFTYPE_EMULATOR:
41            ffStrbufSetF(&result->description, "SW-emulator TPM %s", result->version.chars);
42            break;
43        case TPM_IFTYPE_SPB:
44            ffStrbufSetF(&result->description, "SPB attached TPM %s", result->version.chars);
45            break;
46        default:
47            break;
48    }
49
50    return nullptr;
51}