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/* Copyright 2018 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <pinweaver_tpm_imports.h>
#include <Global.h>
#include <InternalRoutines.h>
#include <dcrypto.h>
#include <util.h>
#include <console.h>
void get_storage_seed(void *buf, size_t *len)
{
*len = MIN(*len, sizeof(gp.SPSeed));
memcpy(buf, &gp.SPSeed, *len);
}
uint8_t get_current_pcr_digest(const uint8_t bitmask[2],
uint8_t sha256_of_selected_pcr[32])
{
TPM2B_DIGEST pcr_digest;
TPML_PCR_SELECTION selection;
selection.count = 1;
selection.pcrSelections[0].hash = TPM_ALG_SHA256;
selection.pcrSelections[0].sizeofSelect = PCR_SELECT_MIN;
memset(&selection.pcrSelections[0].pcrSelect, 0, PCR_SELECT_MIN);
memcpy(&selection.pcrSelections[0].pcrSelect, bitmask, 2);
PCRComputeCurrentDigest(TPM_ALG_SHA256, &selection, &pcr_digest);
if (memcmp(&selection.pcrSelections[0].pcrSelect, bitmask, 2) != 0)
return 1;
memcpy(sha256_of_selected_pcr, &pcr_digest.b.buffer, 32);
return 0;
}
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