tpm: add tpm_get_random()
Add a function to obtain random data from the TPM.
Signed-off-by: André Draszik <adraszik@tycoint.com>
Added commit message, add cast to min()
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/include/tpm.h b/include/tpm.h
index f88388f..2a7528d 100644
--- a/include/tpm.h
+++ b/include/tpm.h
@@ -651,4 +651,16 @@
uint32_t tpm_find_key_sha1(const uint8_t auth[20], const uint8_t
pubkey_digest[20], uint32_t *handle);
#endif /* CONFIG_TPM_LOAD_KEY_BY_SHA1 */
+
+/**
+ * Read random bytes from the TPM RNG. The implementation deals with the fact
+ * that the TPM may legally return fewer bytes than requested by retrying
+ * until @p count bytes have been received.
+ *
+ * @param data output buffer for the random bytes
+ * @param count size of output buffer
+ * @return return code of the operation
+ */
+uint32_t tpm_get_random(void *data, uint32_t count);
+
#endif /* __TPM_H */