From 7690be35deaeac1cb51a5f7896c2a46afabdfad3 Mon Sep 17 00:00:00 2001 From: Mario Six Date: Wed, 11 Jan 2017 16:00:50 +0100 Subject: lib: tpm: Add command to flush resources This patch adds a function to the TPM library, which allows U-Boot to flush resources, e.g. keys, from the TPM. Signed-off-by: Mario Six Reviewed-by: Stefan Roese Reviewed-by: Simon Glass Signed-off-by: Stefan Roese --- lib/tpm.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'lib') diff --git a/lib/tpm.c b/lib/tpm.c index 88f24060f0..fb1221472a 100644 --- a/lib/tpm.c +++ b/lib/tpm.c @@ -645,6 +645,35 @@ uint32_t tpm_get_permissions(uint32_t index, uint32_t *perm) return 0; } +#ifdef CONFIG_TPM_FLUSH_RESOURCES +uint32_t tpm_flush_specific(uint32_t key_handle, uint32_t resource_type) +{ + const uint8_t command[18] = { + 0x00, 0xc1, /* TPM_TAG */ + 0x00, 0x00, 0x00, 0x12, /* parameter size */ + 0x00, 0x00, 0x00, 0xba, /* TPM_COMMAND_CODE */ + 0x00, 0x00, 0x00, 0x00, /* key handle */ + 0x00, 0x00, 0x00, 0x00, /* resource type */ + }; + const size_t key_handle_offset = 10; + const size_t resource_type_offset = 14; + 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), "sdd", + 0, command, sizeof(command), + key_handle_offset, key_handle, + resource_type_offset, resource_type)) + return TPM_LIB_ERROR; + + err = tpm_sendrecv_command(buf, response, &response_length); + if (err) + return err; + return 0; +} +#endif /* CONFIG_TPM_FLUSH_RESOURCES */ + #ifdef CONFIG_TPM_AUTH_SESSIONS /** -- cgit v1.2.3