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tpm: Add an implementation of define_space

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Add support for this so that the TPM can be set up for use with
Chromium OS verified boot.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Simon Glass
2021-02-06 14:23:39 -07:00
committed by Tom Rini
parent 1bea7cc430
commit eadcbc7896
2 changed files with 65 additions and 0 deletions
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47
lib/tpm-v2.c
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@@ -81,6 +81,53 @@ u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_nv_define_space(struct udevice *dev, u32 space_index,
size_t space_size, u32 nv_attributes,
const u8 *nv_policy, size_t nv_policy_size)
{
/*
* Calculate the offset of the nv_policy piece by adding each of the
* chunks below.
*/
uint offset = 10 + 8 + 13 + 14;
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(offset + nv_policy_size),/* Length */
tpm_u32(TPM2_CC_NV_DEFINE_SPACE),/* Command code */
/* handles 8 bytes */
tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */
/* session header 13 bytes */
tpm_u32(9), /* Header size */
tpm_u32(TPM2_RS_PW), /* Password authorisation */
tpm_u16(0), /* nonce_size */
0, /* session_attrs */
tpm_u16(0), /* auth_size */
/* message 14 bytes + policy */
tpm_u16(12 + nv_policy_size), /* size */
tpm_u32(space_index),
tpm_u16(TPM2_ALG_SHA256),
tpm_u32(nv_attributes),
tpm_u16(nv_policy_size),
/* nv_policy */
};
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the password (if any)
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
offset, nv_policy, nv_policy_size);
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm,
const u8 *digest, u32 digest_len)
{