/* SPDX-License-Identifier: BSD-2-Clause */
/*******************************************************************************
 * Copyright 2017-2018, Fraunhofer SIT sponsored by Infineon Technologies AG
 * All rights reserved.
 *******************************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

#include "tss2_fapi.h"

#include "test-fapi.h"

#define LOGMODULE test
#include "util/log.h"
#include "util/aux_util.h"

#define PASSWORD NULL
#define SIGN_TEMPLATE  "sign,noDa"

static bool cb_called = false;

static TSS2_RC
branch_callback(
    FAPI_CONTEXT *context,
    char   const *description,
    char  const **branchNames,
    size_t        numBranches,
    size_t       *selectedBranch,
    void         *userData)
{
    (void) description;
    (void) userData;

    if (numBranches != 2) {
        LOG_ERROR("Wrong number of branches");
        return TSS2_FAPI_RC_GENERAL_FAILURE;
    }

    if (!strcmp(branchNames[0], "branch0"))
        *selectedBranch = 0;
    else if (!strcmp(branchNames[1], "branch0"))
        *selectedBranch = 1;
    else {
        LOG_ERROR("BranchName not found. Got \"%s\" and \"%s\"",
                  branchNames[0], branchNames[1]);
        return TSS2_FAPI_RC_GENERAL_FAILURE;
    }

    cb_called = true;
    return TSS2_RC_SUCCESS;
}


/** Test the FAPI for PolicyOr using signing.
 *
 * Tested FAPI commands:
 *  - Fapi_Provision()
 *  - Fapi_Import()
 *  - Fapi_CreateKey()
 *  - Fapi_SetBranchCB()
 *  - Fapi_Sign()
 *  - Fapi_Delete()
 *
 * Tested Policies:
 *  - PolicyOr
 *  - PolicyPcr
 *
 * @param[in,out] context The FAPI_CONTEXT.
 * @retval EXIT_FAILURE
 * @retval EXIT_SUCCESS
 */
int
test_fapi_key_create_policy_or_sign(FAPI_CONTEXT *context)
{
    TSS2_RC r;
    char *policy_name = "/policy/pol_pcr16_0_or";
    char *policy_file = TOP_SOURCEDIR "/test/data/fapi/policy/pol_pcr16_0_or.json";
    FILE *stream = NULL;
    char *json_policy = NULL;
    uint8_t *signature = NULL;
    char    *publicKey = NULL;
    long policy_size;

    r = Fapi_Provision(context, NULL, NULL, NULL);
    goto_if_error(r, "Error Fapi_Provision", error);

    r = pcr_reset(context, 16);
    goto_if_error(r, "Error pcr_reset", error);

    stream = fopen(policy_file, "r");
    if (!stream) {
        LOG_ERROR("File %s does not exist", policy_file);
        goto error;
    }
    fseek(stream, 0L, SEEK_END);
    policy_size = ftell(stream);
    fclose(stream);
    json_policy = malloc(policy_size + 1);
    goto_if_null(json_policy,
            "Could not allocate memory for the JSON policy",
            TSS2_FAPI_RC_MEMORY, error);
    stream = fopen(policy_file, "r");
    ssize_t ret = read(fileno(stream), json_policy, policy_size);
    if (ret != policy_size) {
        LOG_ERROR("IO error %s.", policy_file);
        goto error;
    }
    json_policy[policy_size] = '\0';

    r = Fapi_Import(context, policy_name, json_policy);
    goto_if_error(r, "Error Fapi_Import", error);

    r = Fapi_CreateKey(context, "/HS/SRK/mySignKey", SIGN_TEMPLATE,
                       policy_name, PASSWORD);
    goto_if_error(r, "Error Fapi_CreateKey", error);
    size_t signatureSize = 0;

    TPM2B_DIGEST digest = {
        .size = 20,
        .buffer = {
            0x67, 0x68, 0x03, 0x3e, 0x21, 0x64, 0x68, 0x24, 0x7b, 0xd0,
            0x31, 0xa0, 0xa2, 0xd9, 0x87, 0x6d, 0x79, 0x81, 0x8f, 0x8f
        }
    };

    r = Fapi_SetBranchCB(context, branch_callback, NULL);
    goto_if_error(r, "Error SetPolicybranchselectioncallback", error);

    r = Fapi_Sign(context, "/HS/SRK/mySignKey", NULL,
                  &digest.buffer[0], digest.size, &signature, &signatureSize,
                  &publicKey, NULL);
    goto_if_error(r, "Error Fapi_Sign", error);

    r = Fapi_Delete(context, "/HS/SRK");
    goto_if_error(r, "Error Fapi_Delete", error);

    SAFE_FREE(json_policy);
    SAFE_FREE(signature);
    SAFE_FREE(publicKey);

    if (!cb_called) {
        LOG_ERROR("Branch selection callback was not called.");
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;

error:
    SAFE_FREE(json_policy);
    SAFE_FREE(signature);
    SAFE_FREE(publicKey);
    return EXIT_FAILURE;
}

int
test_invoke_fapi(FAPI_CONTEXT *fapi_context)
{
    return test_fapi_key_create_policy_or_sign(fapi_context);
}