/* 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 <stdlib.h>

#include "tss2_esys.h"

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

/** This test is intended to test the ESAPI function Esys_EncryptDecrypt.
 *
 * First a primary key is generated. This key will be uses as parent fo a
 * symmetric key, which will be used to encrypt and decrypt a tpm2b. The
 * result will be compared.
 *
 * Tested ESAPI commands:
 *  - Esys_Create() (M)
 *  - Esys_CreatePrimary() (M)
 *  - Esys_EncryptDecrypt() (O)
 *  - Esys_FlushContext() (M)
 *  - Esys_Load() (M)
 *
 * @param[in,out] esys_context The ESYS_CONTEXT.
 * @retval EXIT_FAILURE
 * @retval EXIT_SKIP
 * @retval EXIT_SUCCESS
 */

int
test_esys_encrypt_decrypt(ESYS_CONTEXT * esys_context)
{
    TSS2_RC r;
    ESYS_TR primaryHandle = ESYS_TR_NONE;
    ESYS_TR loadedKeyHandle = ESYS_TR_NONE;
    int failure_return = EXIT_FAILURE;

    TPM2B_PUBLIC *outPublic = NULL;
    TPM2B_CREATION_DATA *creationData = NULL;
    TPM2B_DIGEST *creationHash = NULL;
    TPMT_TK_CREATION *creationTicket = NULL;
    TPM2B_MAX_BUFFER *outData = NULL;
    TPM2B_IV *ivOut = NULL;

    TPM2B_PUBLIC *outPublic2 = NULL;
    TPM2B_PRIVATE *outPrivate2 = NULL;
    TPM2B_CREATION_DATA *creationData2 = NULL;
    TPM2B_DIGEST *creationHash2 = NULL;
    TPMT_TK_CREATION *creationTicket2 = NULL;
    TPM2B_MAX_BUFFER *outData2 = NULL;
    TPM2B_IV *ivOut2 = NULL;

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

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

    inSensitivePrimary.sensitive.userAuth = authValuePrimary;

    TPM2B_PUBLIC inPublic = {
        .size = 0,
        .publicArea = {
            .type = TPM2_ALG_RSA,
            .nameAlg = TPM2_ALG_SHA256,
            .objectAttributes = (TPMA_OBJECT_USERWITHAUTH |
                                 TPMA_OBJECT_RESTRICTED |
                                 TPMA_OBJECT_DECRYPT |
                                 TPMA_OBJECT_FIXEDTPM |
                                 TPMA_OBJECT_FIXEDPARENT |
                                 TPMA_OBJECT_SENSITIVEDATAORIGIN),
            .authPolicy = {
                 .size = 0,
             },
            .parameters.rsaDetail = {
                 .symmetric = {
                     .algorithm = TPM2_ALG_AES,
                     .keyBits.aes = 128,
                     .mode.aes = TPM2_ALG_CFB},
                 .scheme = {
                      .scheme = TPM2_ALG_NULL
                  },
                 .keyBits = 2048,
                 .exponent = 0,
             },
            .unique.rsa = {
                 .size = 0,
                 .buffer = {},
             },
        },
    };

    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);

    r = Esys_TR_SetAuth(esys_context, primaryHandle, &authValuePrimary);
    goto_if_error(r, "Error: TR_SetAuth", error);

    TPM2B_AUTH authKey2 = {
        .size = 6,
        .buffer = {6, 7, 8, 9, 10, 11}
    };

    TPM2B_SENSITIVE_CREATE inSensitive2 = {
        .size = 0,
        .sensitive = {
            .userAuth = {
                 .size = 0,
                 .buffer = {0}
             },
            .data = {
                 .size = 16,
                 .buffer = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16}
             }
        }
    };

    inSensitive2.sensitive.userAuth = authKey2;

    TPM2B_PUBLIC inPublic2 = {
        .size = 0,
        .publicArea = {
            .type = TPM2_ALG_SYMCIPHER,
            .nameAlg = TPM2_ALG_SHA256,
            .objectAttributes = (TPMA_OBJECT_USERWITHAUTH |
                                 TPMA_OBJECT_SIGN_ENCRYPT |
                                 TPMA_OBJECT_DECRYPT),

            .authPolicy = {
                 .size = 0,
             },
            .parameters.symDetail = {
                 .sym = {
                     .algorithm = TPM2_ALG_AES,
                     .keyBits = {.aes = 128},
                     .mode = {.aes = TPM2_ALG_CFB}}
             },
            .unique.sym = {
                 .size = 0,
                 .buffer = {}
             }
        }
    };

    TPM2B_DATA outsideInfo2 = {
        .size = 0,
        .buffer = {}
        ,
    };

    TPML_PCR_SELECTION creationPCR2 = {
        .count = 0,
    };

    r = Esys_Create(esys_context,
                    primaryHandle,
                    ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
                    &inSensitive2,
                    &inPublic2,
                    &outsideInfo2,
                    &creationPCR2,
                    &outPrivate2,
                    &outPublic2,
                    &creationData2, &creationHash2, &creationTicket2);

    if (r == 0x2c2) { /*<< tpm:parameter(2):inconsistent attributes */
        LOG_WARNING("Unsupported symmetric cipher.");
        failure_return = EXIT_SKIP;
        goto error;
    }
    goto_if_error(r, "Error esys create ", error);

    LOG_INFO("AES key created.");

    r = Esys_Load(esys_context,
                  primaryHandle,
                  ESYS_TR_PASSWORD,
                  ESYS_TR_NONE,
                  ESYS_TR_NONE, outPrivate2, outPublic2, &loadedKeyHandle);
    goto_if_error(r, "Error esys load ", error);

    LOG_INFO("AES key loaded.");

    r = Esys_TR_SetAuth(esys_context, loadedKeyHandle, &authKey2);
    goto_if_error(r, "Error esys TR_SetAuth ", error);

    ESYS_TR keyHandle_handle = loadedKeyHandle;
    TPMI_YES_NO decrypt = TPM2_YES;
    TPMI_YES_NO encrypt = TPM2_NO;
    TPMI_ALG_SYM_MODE mode = TPM2_ALG_NULL;
    TPM2B_IV ivIn = {
        .size = 16,
        .buffer = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16}
    };
    TPM2B_MAX_BUFFER inData = {
        .size = 16,
        .buffer = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16}
    };

    r = Esys_EncryptDecrypt(
        esys_context,
        keyHandle_handle,
        ESYS_TR_PASSWORD,
        ESYS_TR_NONE,
        ESYS_TR_NONE,
        encrypt,
        mode,
        &ivIn,
        &inData,
        &outData,
        &ivOut);

    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_EncryptDecrypt not supported by TPM.");
        failure_return = EXIT_SKIP;
        goto error;
    }

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


    r = Esys_EncryptDecrypt(
        esys_context,
        keyHandle_handle,
        ESYS_TR_PASSWORD,
        ESYS_TR_NONE,
        ESYS_TR_NONE,
        decrypt,
        mode,
        &ivIn,
        outData,
        &outData2,
        &ivOut2);

    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_EncryptDecrypt not supported by TPM.");
        failure_return = EXIT_SKIP;
        goto error;
    }

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

    LOGBLOB_DEBUG(&outData2->buffer[0], outData2->size, "** Decrypted data **");

    if (outData2->size != inData.size ||
        memcmp(&outData2->buffer, &inData.buffer[0], outData2->size) != 0) {
        LOG_ERROR("Error: decrypted text not  equal to origin");
        goto error;
    }

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

    primaryHandle = ESYS_TR_NONE;

    r = Esys_FlushContext(esys_context, loadedKeyHandle);
    goto_if_error(r, "Error during FlushContext", error);

    Esys_Free(outPublic);
    Esys_Free(creationData);
    Esys_Free(creationHash);
    Esys_Free(creationTicket);
    Esys_Free(outData);
    Esys_Free(ivOut);

    Esys_Free(outPublic2);
    Esys_Free(outPrivate2);
    Esys_Free(creationData2);
    Esys_Free(creationHash2);
    Esys_Free(creationTicket2);
    Esys_Free(outData2);
    Esys_Free(ivOut2);
    return EXIT_SUCCESS;

 error:

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

    if (loadedKeyHandle != ESYS_TR_NONE) {
        if (Esys_FlushContext(esys_context, loadedKeyHandle) != TSS2_RC_SUCCESS) {
            LOG_ERROR("Cleanup loadedKeyHandle failed.");
        }
    }
    Esys_Free(outPublic);
    Esys_Free(creationData);
    Esys_Free(creationHash);
    Esys_Free(creationTicket);
    Esys_Free(outData);
    Esys_Free(ivOut);

    Esys_Free(outPublic2);
    Esys_Free(outPrivate2);
    Esys_Free(creationData2);
    Esys_Free(creationHash2);
    Esys_Free(creationTicket2);
    Esys_Free(outData2);
    Esys_Free(ivOut2);
    return failure_return;
}

int
test_invoke_esapi(ESYS_CONTEXT * esys_context) {
    return test_esys_encrypt_decrypt(esys_context);
}