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tpm: Require a digest source when extending the PCR

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This feature is used for measured boot, so we can add a log entry to the
TCPA with some information about where the digest comes from. It is not
currently supported in the TPM drivers, but add it to the API so that
code which expects it can signal its request.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Simon Glass
2022-08-30 21:05:32 -06:00
committed by Ilias Apalodimas
parent 67fe8cc001
commit a557d258c6
5 changed files with 18 additions and 10 deletions
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10
lib/tpm_api.c
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@@ -140,15 +140,17 @@ u32 tpm_write_lock(struct udevice *dev, u32 index)
}
u32 tpm_pcr_extend(struct udevice *dev, u32 index, const void *in_digest,
void *out_digest)
uint size, void *out_digest, const char *name)
{
if (tpm_is_v1(dev))
if (tpm_is_v1(dev)) {
return tpm1_extend(dev, index, in_digest, out_digest);
else if (tpm_is_v2(dev))
} else if (tpm_is_v2(dev)) {
return tpm2_pcr_extend(dev, index, TPM2_ALG_SHA256, in_digest,
TPM2_DIGEST_LEN);
else
/* @name is ignored as we do not support the TPM log here */
} else {
return -ENOSYS;
}
}
u32 tpm_pcr_read(struct udevice *dev, u32 index, void *data, size_t count)