/* 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 "tss2_common.h"     // for TSS2_RC, TSS2_RC_SUCCESS
#include "tss2_esys.h"       // for Esys_Free, ESYS_TR_NONE, Esys_FlushContext
#include "tss2_tpm2_types.h" // for TPM2B_AUTH, TPM2B_DIGEST, TPM2B_NAME

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

/** This test is intended to test the ESYS signing and signature verification.
 *
 * Tested ESYS commands:
 *  - Esys_CreatePrimary() (M)
 *  - Esys_FlushContext() (M)
 *  - Esys_ReadPublic() (M)
 *  - Esys_Sign() (M)
 *  - Esys_VerifySignature() (M)
 *
 * @param[in,out] esys_context The ESYS_CONTEXT.
 * @retval EXIT_FAILURE
 * @retval EXIT_SUCCESS
 */

int
test_esys_verify_signature(ESYS_CONTEXT *esys_context) {
    TSS2_RC r;
    ESYS_TR primaryHandle = ESYS_TR_NONE;

    TPM2B_PUBLIC        *outPublic = NULL;
    TPM2B_CREATION_DATA *creationData = NULL;
    TPM2B_DIGEST        *creationHash = NULL;
    TPMT_TK_CREATION    *creationTicket = NULL;

    TPM2B_NAME     *nameKeySign = NULL;
    TPM2B_NAME     *keyQualifiedName = NULL;
    TPMT_SIGNATURE *signature = NULL;

    TPMT_TK_VERIFIED *validation = NULL;

    /*
     * 1. Create Primary. This primary will be used as signing key.
     */

    TPM2B_AUTH authValuePrimary = { .size = 5, .buffer = { 1, 2, 3, 4, 5 } };

    TPM2B_SENSITIVE_CREATE inSensitivePrimary = {
        .size = 0,
        .sensitive = {
            .userAuth = authValuePrimary,
            .data = {
                 .size = 0,
                 .buffer = {0},
             },
        },
    };

    TPM2B_PUBLIC inPublic = {
        .size = 0,
        .publicArea = {
            .type = TPM2_ALG_RSA,
            .nameAlg = TPM2_ALG_SHA256,
            .objectAttributes = (TPMA_OBJECT_USERWITHAUTH |
                                 TPMA_OBJECT_SIGN_ENCRYPT  |
                                 TPMA_OBJECT_FIXEDTPM |
                                 TPMA_OBJECT_FIXEDPARENT |
                                 TPMA_OBJECT_SENSITIVEDATAORIGIN),
            .authPolicy = {
                 .size = 0,
             },
            .parameters.rsaDetail = {
                 .symmetric = {
                     .algorithm = TPM2_ALG_NULL,
                     .keyBits.aes = 128,
                     .mode.aes = TPM2_ALG_CFB},
                 .scheme = {
                      .scheme = TPM2_ALG_RSAPSS,
                      .details = {
                          .rsapss = { .hashAlg = TPM2_ALG_SHA256 }
                      }
                  },
                 .keyBits = 2048,
                 .exponent = 0,
             },
            .unique.rsa = {
                 .size = 0,
                 .buffer = {},
             },
        },
    };
    LOG_INFO("\nRSA key will be created.");

    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, ESYS_TR_PASSWORD, ESYS_TR_NONE,
                           ESYS_TR_NONE, &inSensitivePrimary, &inPublic, &outsideInfo, &creationPCR,
                           &primaryHandle, &outPublic, &creationData, &creationHash,
                           &creationTicket);
    goto_if_error(r, "Error esys create primary", error);
    Esys_Free(outPublic);
    Esys_Free(creationData);
    Esys_Free(creationHash);
    Esys_Free(creationTicket);

    r = Esys_ReadPublic(esys_context, primaryHandle, ESYS_TR_NONE, ESYS_TR_NONE, ESYS_TR_NONE,
                        &outPublic, &nameKeySign, &keyQualifiedName);
    goto_if_error(r, "Error: ReadPublic", error);

    TPMT_SIG_SCHEME   inScheme = { .scheme = TPM2_ALG_NULL };
    TPMT_TK_HASHCHECK hash_validation
        = { .tag = TPM2_ST_HASHCHECK, .hierarchy = TPM2_RH_OWNER, .digest = { 0 } };
    /* Digest to be signed. */
    TPM2B_DIGEST digest = { .size = 32, .buffer = { 1,  2,  3,  4,  5,  6,  7,  8,  9,  10, 11,
                                                    12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
                                                    23, 24, 25, 26, 27, 28, 29, 30, 31, 32 } };

    /*
     * 1. Sign digest and verfiy the signature.
     */

    r = Esys_Sign(esys_context, primaryHandle, ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
                  &digest, &inScheme, &hash_validation, &signature);
    goto_if_error(r, "Error: Sign", error);

    r = Esys_VerifySignature(esys_context, primaryHandle, ESYS_TR_NONE, ESYS_TR_NONE, ESYS_TR_NONE,
                             &digest, signature, &validation);
    goto_if_error(r, "Error: Sign", error);

    r = Esys_FlushContext(esys_context, primaryHandle);
    goto_if_error(r, "Error: FlushContext", error);

    Esys_Free(outPublic);

    Esys_Free(nameKeySign);
    Esys_Free(keyQualifiedName);
    Esys_Free(signature);
    Esys_Free(validation);
    return EXIT_SUCCESS;

error:

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

    Esys_Free(outPublic);
    Esys_Free(creationData);
    Esys_Free(creationHash);

    Esys_Free(nameKeySign);
    Esys_Free(keyQualifiedName);
    Esys_Free(signature);
    Esys_Free(validation);
    return EXIT_FAILURE;
}

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