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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <security/tpm/tspi.h>
#include <vb2_api.h>
#include <security/vboot/tpm_common.h>
#define TPM_PCR_BOOT_MODE "VBOOT: boot mode"
#define TPM_PCR_GBB_HWID_NAME "VBOOT: GBB HWID"
uint32_t vboot_setup_tpm(struct vb2_context *ctx)
{
uint32_t result;
result = tpm_setup(ctx->flags & VB2_CONTEXT_S3_RESUME);
if (result == TPM_E_MUST_REBOOT)
ctx->flags |= VB2_CONTEXT_SECDATA_WANTS_REBOOT;
return result;
}
uint32_t vboot_extend_pcr(struct vb2_context *ctx, int pcr,
enum vb2_pcr_digest which_digest)
{
uint8_t buffer[VB2_PCR_DIGEST_RECOMMENDED_SIZE];
uint32_t size = sizeof(buffer);
int rv;
rv = vb2api_get_pcr_digest(ctx, which_digest, buffer, &size);
if (rv != VB2_SUCCESS)
return rv;
if (size < TPM_PCR_MINIMUM_DIGEST_SIZE)
return VB2_ERROR_UNKNOWN;
switch (which_digest) {
/* SHA1 of (devmode|recmode|keyblock) bits */
case BOOT_MODE_PCR:
return tpm_extend_pcr(pcr, VB2_HASH_SHA1, buffer, size,
TPM_PCR_BOOT_MODE);
/* SHA256 of HWID */
case HWID_DIGEST_PCR:
return tpm_extend_pcr(pcr, VB2_HASH_SHA256, buffer,
size, TPM_PCR_GBB_HWID_NAME);
default:
return VB2_ERROR_UNKNOWN;
}
}
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