/* 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" // IWYU pragma: keep
#endif

#include <stdlib.h> // for NULL, EXIT_FAILURE, EXIT_SUCCESS
#include <string.h> // for memset

#include "test-esys.h"       // for EXIT_SKIP, test_invoke_esys
#include "tss2_common.h"     // for TSS2_RC_SUCCESS, TSS2_RESMGR_RC_LAYER
#include "tss2_esys.h"       // for Esys_Free, ESYS_TR_NONE, Esys_FlushContext
#include "tss2_tpm2_types.h" // for TPM2_RC_COMMAND_CODE, TPM2B_ECC_POINT

#define LOGMODULE test
#include "util/log.h" // for goto_if_error, LOG_ERROR, LOG_WARNING

/** This test is intended to test Esys_ECDH_ZGen.
 *
 * The test is based on an ECC key created with Esys_CreatePrimary
 * and data produced by the command Esys_EC_Ephemeral.
 *
 * Tested ESYS commands:
 *  - Esys_CreatePrimary() (M)
 *  - Esys_ECDH_ZGen() (M)
 *  - Esys_EC_Ephemeral() (F)
 *  - Esys_FlushContext() (M)
 *  - Esys_StartAuthSession() (M)
 *  - Esys_ZGen_2Phase() (O)
 *
 * @param[in,out] esys_context The ESYS_CONTEXT.
 * @retval EXIT_FAILURE
 * @retval EXIT_SKIP
 * @retval EXIT_SUCCESS
 */

int
test_esys_zgen_2phase(ESYS_CONTEXT *esys_context) {
    TSS2_RC      r;
    ESYS_TR      eccHandle = ESYS_TR_NONE;
    int          failure_return = EXIT_FAILURE;
    ESYS_TR      session = ESYS_TR_NONE;
    TPMT_SYM_DEF symmetric
        = { .algorithm = TPM2_ALG_AES, .keyBits = { .aes = 128 }, .mode = { .aes = TPM2_ALG_CFB } };
    TPMA_SESSION sessionAttributes;
    TPM2B_NONCE  nonceCaller = { .size = 20, .buffer = { 1,  2,  3,  4,  5,  6,  7,  8,  9,  10,
                                                         11, 12, 13, 14, 15, 16, 17, 18, 19, 20 } };

    TPM2B_PUBLIC        *outPublic = NULL;
    TPM2B_CREATION_DATA *creationData = NULL;
    TPM2B_DIGEST        *creationHash = NULL;
    TPMT_TK_CREATION    *creationTicket = NULL;
    TPM2B_ECC_POINT     *outZ1 = NULL;
    TPM2B_ECC_POINT     *outZ2 = NULL;
    TPM2B_ECC_POINT     *Q = NULL;

    memset(&sessionAttributes, 0, sizeof sessionAttributes);

    r = Esys_StartAuthSession(esys_context, ESYS_TR_NONE, ESYS_TR_NONE, ESYS_TR_NONE, ESYS_TR_NONE,
                              ESYS_TR_NONE, &nonceCaller, TPM2_SE_HMAC, &symmetric, TPM2_ALG_SHA256,
                              &session);
    goto_if_error(r, "Error: During initialization of session", error);

    TPM2B_SENSITIVE_CREATE inSensitive
        = { .size = 0,
            .sensitive = { .userAuth = { .size = 0, .buffer = { 0 } },
                           .data = { .size = 0, .buffer = { 0 } } } };
    TPM2B_PUBLIC inPublicECC = {
        .size = 0,
        .publicArea = {
            .type = TPM2_ALG_ECC,
            .nameAlg = TPM2_ALG_SHA256,
            .objectAttributes = (TPMA_OBJECT_USERWITHAUTH |
                                 TPMA_OBJECT_DECRYPT |
                                 TPMA_OBJECT_FIXEDTPM |
                                 TPMA_OBJECT_FIXEDPARENT |
                                 TPMA_OBJECT_SENSITIVEDATAORIGIN),
            .authPolicy = {
                 .size = 0,
             },
            .parameters.eccDetail = {
                 .symmetric = {
                     .algorithm = TPM2_ALG_NULL,
                     .keyBits.aes = 128,
                     .mode.aes = TPM2_ALG_CFB,
                 },
                 .scheme = {
                      .scheme = TPM2_ALG_ECDH,
                      .details = {.ecdh = {.hashAlg = TPM2_ALG_SHA256}
                      }
                  },
                 .curveID = TPM2_ECC_NIST_P256,
                 .kdf = {.scheme = TPM2_ALG_NULL }
             },
            .unique.ecc = {
                 .x = {.size = 0,.buffer = {}},
                 .y = {.size = 0,.buffer = {}}
             }
            ,
        }
    };
    LOG_INFO("\nECC key will be created.");
    TPM2B_PUBLIC inPublic = inPublicECC;

    TPM2B_DATA outsideInfo = {
        .size = 0,
        .buffer = {},
    };

    TPML_PCR_SELECTION creationPCR = {
        .count = 0,
    };

    TPM2B_AUTH authValue = { .size = 0, .buffer = {} };

    r = Esys_TR_SetAuth(esys_context, ESYS_TR_RH_OWNER, &authValue);
    goto_if_error(r, "Error: TR_SetAuth", error);

    r = Esys_CreatePrimary(esys_context, ESYS_TR_RH_OWNER, session, ESYS_TR_NONE, ESYS_TR_NONE,
                           &inSensitive, &inPublic, &outsideInfo, &creationPCR, &eccHandle,
                           &outPublic, &creationData, &creationHash, &creationTicket);
    goto_if_error(r, "Error esys create primary", error);

    TPMI_ECC_CURVE curveID = TPM2_ECC_NIST_P256;
    UINT16         counter;

    r = Esys_EC_Ephemeral(esys_context, ESYS_TR_NONE, ESYS_TR_NONE, ESYS_TR_NONE, curveID, &Q,
                          &counter);

    if ((r == TPM2_RC_COMMAND_CODE) || (r == (TPM2_RC_COMMAND_CODE | TSS2_RESMGR_RC_LAYER))
        || (r == (TPM2_RC_COMMAND_CODE | TSS2_RESMGR_TPM_RC_LAYER))) {
        LOG_WARNING("Command TPM2_Ephemeral not supported by TPM.");
        failure_return = EXIT_SKIP;
        goto error;
    }

    goto_if_error(r, "Error: EC_Ephemeral", error);

    TPM2B_ECC_POINT       inQsB = { .size = 0, .point = outPublic->publicArea.unique.ecc };
    TPMI_ECC_KEY_EXCHANGE inScheme = TPM2_ALG_ECDH;
    TPM2B_ECC_POINT       inQeB = *Q;

    r = Esys_ZGen_2Phase(esys_context, eccHandle, ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
                         &inQsB, &inQeB, inScheme, counter, &outZ1, &outZ2);

    if ((r == TPM2_RC_COMMAND_CODE) || (r == (TPM2_RC_COMMAND_CODE | TSS2_RESMGR_RC_LAYER))
        || (r == (TPM2_RC_COMMAND_CODE | TSS2_RESMGR_TPM_RC_LAYER))) {
        LOG_WARNING("Command TPM2_ZGen_2Phase not supported by TPM.");
        failure_return = EXIT_SKIP;
        goto error;
    }

    goto_if_error(r, "Error: ZGen_2Phase", error);

    r = Esys_FlushContext(esys_context, eccHandle);
    goto_if_error(r, "Flushing context", error);

    r = Esys_FlushContext(esys_context, session);
    goto_if_error(r, "Flushing context", error);

    Esys_Free(outPublic);
    Esys_Free(creationData);
    Esys_Free(creationHash);
    Esys_Free(creationTicket);
    Esys_Free(outZ1);
    Esys_Free(outZ2);
    Esys_Free(Q);
    return EXIT_SUCCESS;

error:
    LOG_ERROR("\nError Code: %x\n", r);

    if (eccHandle != ESYS_TR_NONE) {
        if (Esys_FlushContext(esys_context, eccHandle) != TSS2_RC_SUCCESS) {
            LOG_ERROR("Cleanup eccHandle failed.");
        }
    }

    if (session != ESYS_TR_NONE) {
        if (Esys_FlushContext(esys_context, session) != TSS2_RC_SUCCESS) {
            LOG_ERROR("Cleanup session failed.");
        }
    }

    Esys_Free(outPublic);
    Esys_Free(creationData);
    Esys_Free(creationHash);
    Esys_Free(creationTicket);
    Esys_Free(outZ1);
    Esys_Free(outZ2);
    Esys_Free(Q);
    return failure_return;
}

int
test_invoke_esys(ESYS_CONTEXT *esys_context) {
    return test_esys_zgen_2phase(esys_context);
}
