diff options
| author | André Draszik <adraszik@tycoint.com> | 2017-10-03 16:55:52 +0100 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2017-11-17 07:15:40 -0700 |
| commit | 3c6050277b54f536e7effbe850dcc970a27387ab (patch) | |
| tree | 0060f5315a771e64bff35445700b4db84d3a72f5 /include/tpm.h | |
| parent | e8155dfe33eb2b3e538e8717d6578c1d08651454 (diff) | |
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>
Diffstat (limited to 'include/tpm.h')
| -rw-r--r-- | include/tpm.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/tpm.h b/include/tpm.h index f88388f353..2a7528dd48 100644 --- a/include/tpm.h +++ b/include/tpm.h @@ -651,4 +651,16 @@ uint32_t tpm_flush_specific(uint32_t key_handle, uint32_t resource_type); 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 */ |