AES_IV_LEN
u_int8_t iv[AES_IV_LEN], tmp_iv[AES_IV_LEN];
i = len % AES_IV_LEN;
i = AES_IV_LEN - i;
if (blob_len < sizeof hash + AES_IV_LEN + 2 * sizeof(u_int32_t))
*msglen = blob_len - sizeof hash - AES_IV_LEN - 2 * sizeof(u_int32_t);
memcpy(msg, iv + AES_IV_LEN, *msglen);
dump_buf(2, iv, AES_IV_LEN, "net_read: got IV");