- uint16_t netlen = htons(len - 21);
-
- char buffer[len + 23];
-
- memcpy(buffer, &netlen, 2);
- memcpy(buffer + 2, data, len);
-
- memcpy(&seqno, buffer + 2, 4);
-
- // Check HMAC and decrypt.
- if(!digest_verify(&s->indigest, buffer, len - 14, buffer + len - 14))
- return error(s, EIO, "Invalid HMAC");
-
- cipher_set_counter(&s->incipher, &seqno, sizeof seqno);
- if(!cipher_counter_xor(&s->incipher, buffer + 6, len - 4, buffer + 6))
- return false;