diff options
Diffstat (limited to 'firmware/lib/tpm2_lite/tlcl.c')
| -rw-r--r-- | firmware/lib/tpm2_lite/tlcl.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/firmware/lib/tpm2_lite/tlcl.c b/firmware/lib/tpm2_lite/tlcl.c index 8e5fbeac..61c4c414 100644 --- a/firmware/lib/tpm2_lite/tlcl.c +++ b/firmware/lib/tpm2_lite/tlcl.c @@ -572,9 +572,30 @@ uint32_t TlclReadLock(uint32_t index) uint32_t TlclGetRandom(uint8_t *data, uint32_t length, uint32_t *size) { - *size = 0; - VB2_DEBUG("NOT YET IMPLEMENTED\n"); - return TPM_E_IOERROR; + uint32_t rv; + struct tpm2_get_random_cmd random; + struct get_random_response *response = &tpm2_resp.random; + size_t max_len, offset; + + offset = offsetof(struct tpm2_response, random.random_bytes.buffer); + max_len = TPM_BUFFER_SIZE - offset; + + if (length > max_len) + return TPM_E_BUFFER_SIZE; + + random.bytes_requested = length; + + rv = tpm_send_receive(TPM2_GetRandom, &random, &tpm2_resp); + if (rv != TPM_SUCCESS) + return rv; + + *size = response->random_bytes.size; + if (*size > length) + return TPM_E_RESPONSE_TOO_LARGE; + + memcpy(data, response->random_bytes.buffer, *size); + + return rv; } // Converts TPM_PT_VENDOR_STRING_x |value| to an array of bytes in |buf|. |