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### Description

<!-- Explain what you did, what you expected to happen, and what actually happened. -->

``` Installed new kamailio 5.3, setting the uac module to register trunk. The trunk has been added to the Mysql with an open password (or use ha1). When try to register and send authorization data, the provider's server always gives a 403 error. After the analysis, I found that the kamailio sends an incorrect hash in response header.

```

### Troubleshooting

#### Reproduction

<!-- If the issue can be reproduced, describe how it can be done. -->

#### Debugging Data

<!-- If you got a core dump, use gdb to extract troubleshooting data - full backtrace, local variables and the list of the code at the issue location.

gdb /path/to/kamailio /path/to/corefile bt full info locals list

If you are familiar with gdb, feel free to attach more of what you consider to be relevant. -->

``` (paste your debugging data here) ```

#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your log messages here) ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` Provider send "407 Proxy Authentication Required":

Proxy-Authenticate: Digest nonce="MTU3MTY5Mzg2MTrbrxRPWP0AIkC7fowq+nZn", opaque="MTU3MTY5Mzg2MTrbrxRPWP0AIkC7fowq+nZn", algorithm=md5, realm="BREDBAND", qop="auth"

Kamailio send new "Register":

Proxy-Authorization: Digest username="79205615793", realm="BREDBAND", nonce="MTU3MTY5Mzg2MTrbrxRPWP0AIkC7fowq+nZn", uri="sip:sbc.megafon.ru", opaque="MTU3MTY5Mzg2MTrbrx WP0AIkC7fowq+nZn", qop=auth, nc=00000001, cnonce="3335441185", response="395830e40a92fd7d4564d82dfab1dac0", algorithm=MD5

If you calculate the hash manually: Correct response: "2cee0f5a35c0e4831455496ce040eaf4"

```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. --> ``` Problem with code in auth_alg.c. He tries to verify that there is an encrypted password, even if it is not set in the database. Next, an uncorrect calculation of the hash for the answer 401 occurs. If you remove the block

``` if(UAC_FLCRED_HA1 & UAC_FLCRED_HA1) { memcpy(sess_key, crd->passwd.s, HASHHEXLEN); sess_key[HASHHEXLEN] = '\0'; if ( auth->flags& AUTHENTICATE_MD5SESS ) { cvt_bin(sess_key, HA1); } else { return; } ```

Password registration works. Maybe there are 2 problems. He constantly tries to calculate the hash for ha1 password (if used open password), and if it is, then the function cvt_bin incorrectly considers it.

``` ### Additional Information

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

``` kamailio 5.3.0 (x86_64/linux) 4cc67a ```

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->

``` Linux refs4 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-3~deb8u1 (2015-04-24) x86_64 GNU/Linux

```