[sr-dev] [kamailio/kamailio] auth_ephemeral broken for sha256/384/512 (Issue #2963)

[Justin LaVelle]

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### Description

When using `auth_ephemeral` module I found that using anything other than the default sha1 would fail and crash Kamailio.

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Explain what you did, what you expected to happen, and what actually happened.
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### Troubleshooting


#### Log Messages

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```
*** stack smashing detected ***: <unknown> terminated
13(85) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 15
 0(65) ALERT: <core> [main.c:788]: handle_sigs(): child process 77 exited by a signal 6
 0(65) ALERT: <core> [main.c:791]: handle_sigs(): core was generated
```

#### SIP Traffic

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```
N/A
```

### Possible Solutions

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I dug into the code and have a Pull Request to fix the issue. 
https://github.com/kamailio/kamailio/pull/2962


### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
version: kamailio 5.6.0-dev2 (x86_64/linux) 3c905e
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 3c905e -dirty
compiled on 11:02:49 Dec  4 2021 with gcc 8.3.0
```

* **Operating System**:

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```
Docker debian:debian on MacOS Mojave 10.14
Linux 47b9de1080dc 5.10.47-linuxkit #1 SMP Sat Jul 3 21:51:47 UTC 2021 x86_64 GNU/Linux
```


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https://github.com/kamailio/kamailio/issues/2963
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