49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* This file is part of the coreboot project. */
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#include <security/tpm/tspi.h>
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#include <vb2_api.h>
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#include <security/vboot/tpm_common.h>
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#define TPM_PCR_BOOT_MODE "VBOOT: boot mode"
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#define TPM_PCR_GBB_HWID_NAME "VBOOT: GBB HWID"
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uint32_t vboot_setup_tpm(struct vb2_context *ctx)
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{
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uint32_t result;
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result = tpm_setup(ctx->flags & VB2_CONTEXT_S3_RESUME);
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if (result == TPM_E_MUST_REBOOT)
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ctx->flags |= VB2_CONTEXT_SECDATA_WANTS_REBOOT;
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return result;
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}
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vb2_error_t vboot_extend_pcr(struct vb2_context *ctx, int pcr,
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enum vb2_pcr_digest which_digest)
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{
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uint8_t buffer[VB2_PCR_DIGEST_RECOMMENDED_SIZE];
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uint32_t size = sizeof(buffer);
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vb2_error_t rv;
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rv = vb2api_get_pcr_digest(ctx, which_digest, buffer, &size);
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if (rv != VB2_SUCCESS)
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return rv;
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if (size < TPM_PCR_MINIMUM_DIGEST_SIZE)
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return VB2_ERROR_UNKNOWN;
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switch (which_digest) {
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/* SHA1 of (devmode|recmode|keyblock) bits */
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case BOOT_MODE_PCR:
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return tpm_extend_pcr(pcr, VB2_HASH_SHA256, buffer, size,
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TPM_PCR_BOOT_MODE);
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/* SHA256 of HWID */
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case HWID_DIGEST_PCR:
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return tpm_extend_pcr(pcr, VB2_HASH_SHA256, buffer,
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size, TPM_PCR_GBB_HWID_NAME);
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default:
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return VB2_ERROR_UNKNOWN;
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}
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}
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