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| author | Simon Glass <sjg@chromium.org> | 2021-02-06 14:23:39 -0700 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-03-02 15:53:37 -0500 |
| commit | eadcbc7896e8d3eefafc8a34dee125a7d7eecead (patch) | |
| tree | 0d3e45b04d1b41e8f826a33b1f107d5926164430 /lib | |
| parent | 1bea7cc430316674dfe3dd44b6bb53c38c4946cd (diff) | |
| download | u-boot-eadcbc7896e8d3eefafc8a34dee125a7d7eecead.tar.gz u-boot-eadcbc7896e8d3eefafc8a34dee125a7d7eecead.tar.xz u-boot-eadcbc7896e8d3eefafc8a34dee125a7d7eecead.zip | |
tpm: Add an implementation of define_space
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>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/tpm-v2.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index c4e869ec5b..e9bf4018fe 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -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) { |