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      1 /*
      2  * Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (the "License").  You may not use
      5  * this file except in compliance with the License.  You can obtain a copy
      6  * in the file LICENSE in the source distribution or at
      7  * https://www.openssl.org/source/license.html
      8  */
      9 
     10 #include "internal/quic_types.h"
     11 #include <openssl/rand.h>
     12 #include <openssl/err.h>
     13 
     14 int ossl_quic_gen_rand_conn_id(OSSL_LIB_CTX *libctx, size_t len,
     15     QUIC_CONN_ID *cid)
     16 {
     17     if (len > QUIC_MAX_CONN_ID_LEN)
     18         return 0;
     19 
     20     cid->id_len = (unsigned char)len;
     21 
     22     if (RAND_bytes_ex(libctx, cid->id, len, len * 8) != 1) {
     23         ERR_raise(ERR_LIB_SSL, ERR_R_RAND_LIB);
     24         cid->id_len = 0;
     25         return 0;
     26     }
     27 
     28     return 1;
     29 }
     30