tpm: add TPM2_Clear command support
Add support for the TPM2_Clear command.
Change the command file and the help accordingly.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c
index a317e03..34a93ab 100644
--- a/lib/tpm-v2.c
+++ b/lib/tpm-v2.c
@@ -42,3 +42,38 @@
return tpm_sendrecv_command(command_v2, NULL, NULL);
}
+
+u32 tpm2_clear(u32 handle, const char *pw, const ssize_t pw_sz)
+{
+ u8 command_v2[COMMAND_BUFFER_SIZE] = {
+ tpm_u16(TPM2_ST_SESSIONS), /* TAG */
+ tpm_u32(27 + pw_sz), /* Length */
+ tpm_u32(TPM2_CC_CLEAR), /* Command code */
+
+ /* HANDLE */
+ tpm_u32(handle), /* TPM resource handle */
+
+ /* AUTH_SESSION */
+ tpm_u32(9 + pw_sz), /* Authorization size */
+ tpm_u32(TPM2_RS_PW), /* Session handle */
+ tpm_u16(0), /* Size of <nonce> */
+ /* <nonce> (if any) */
+ 0, /* Attributes: Cont/Excl/Rst */
+ tpm_u16(pw_sz), /* Size of <hmac/password> */
+ /* STRING(pw) <hmac/password> (if any) */
+ };
+ unsigned int offset = 27;
+ 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, pw, pw_sz);
+ offset += pw_sz;
+ if (ret)
+ return TPM_LIB_ERROR;
+
+ return tpm_sendrecv_command(command_v2, NULL, NULL);
+}