diff options
| author | Simon Glass <sjg@chromium.org> | 2015-08-22 18:31:41 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-08-31 07:57:29 -0600 |
| commit | 2132f971ba2443bc31046cbbf18bbf5e7c017b50 (patch) | |
| tree | 4d21fac12c7a0f035780d06ef33276154d484a98 /lib/tpm.c | |
| parent | ad77694e23be841feeb91e8173d4d3d4e8ef2bf0 (diff) | |
tpm: Add functions to access flags and permissions
Add a few new functions which will be used by the test command in a future
patch.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Christophe Ricard<christophe-h.ricard@st.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Diffstat (limited to 'lib/tpm.c')
| -rw-r--r-- | lib/tpm.c | 51 |
1 files changed, 50 insertions, 1 deletions
diff --git a/lib/tpm.c b/lib/tpm.c index 19bf0b59905..5d5f707e372 100644 --- a/lib/tpm.c +++ b/lib/tpm.c @@ -18,7 +18,6 @@ /* Useful constants */ enum { COMMAND_BUFFER_SIZE = 256, - TPM_PUBEK_SIZE = 256, TPM_REQUEST_HEADER_LENGTH = 10, TPM_RESPONSE_HEADER_LENGTH = 10, PCR_DIGEST_LENGTH = 20, @@ -610,6 +609,56 @@ uint32_t tpm_get_capability(uint32_t cap_area, uint32_t sub_cap, return 0; } +uint32_t tpm_get_permanent_flags(struct tpm_permanent_flags *pflags) +{ + const uint8_t command[22] = { + 0x0, 0xc1, /* TPM_TAG */ + 0x0, 0x0, 0x0, 0x16, /* parameter size */ + 0x0, 0x0, 0x0, 0x65, /* TPM_COMMAND_CODE */ + 0x0, 0x0, 0x0, 0x4, /* TPM_CAP_FLAG_PERM */ + 0x0, 0x0, 0x0, 0x4, /* subcap size */ + 0x0, 0x0, 0x1, 0x8, /* subcap value */ + }; + uint8_t response[COMMAND_BUFFER_SIZE]; + size_t response_length = sizeof(response); + uint32_t err; + + err = tpm_sendrecv_command(command, response, &response_length); + if (err) + return err; + memcpy(pflags, response + TPM_HEADER_SIZE, sizeof(*pflags)); + + return 0; +} + +uint32_t tpm_get_permissions(uint32_t index, uint32_t *perm) +{ + const uint8_t command[22] = { + 0x0, 0xc1, /* TPM_TAG */ + 0x0, 0x0, 0x0, 0x16, /* parameter size */ + 0x0, 0x0, 0x0, 0x65, /* TPM_COMMAND_CODE */ + 0x0, 0x0, 0x0, 0x11, + 0x0, 0x0, 0x0, 0x4, + }; + const size_t index_offset = 18; + const size_t perm_offset = 60; + uint8_t buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE]; + size_t response_length = sizeof(response); + uint32_t err; + + if (pack_byte_string(buf, sizeof(buf), "d", 0, command, sizeof(command), + index_offset, index)) + return TPM_LIB_ERROR; + err = tpm_sendrecv_command(buf, response, &response_length); + if (err) + return err; + if (unpack_byte_string(response, response_length, "d", + perm_offset, perm)) + return TPM_LIB_ERROR; + + return 0; +} + #ifdef CONFIG_TPM_AUTH_SESSIONS /** |