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### Description

<!-- Explain what you did, what you expected to happen, and what actually happened. --> Tried to verify a dubious JWT, but I get a token decoding error. I tried different variations of the key, such as `.pem`, `.key` extensions, `PKCS1`, `PKCS8` formats, reading the key from a variable or file. ### Troubleshooting

#### Reproduction

<!-- If the issue can be reproduced, describe how it can be done. --> Have the following Kamailio config: ``` loadmodule "jwt.so" ... modparam("jwt", "key_mode", 0) .... $var(authorization_header_value) = "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJhdWQiOiIyIiwianRpIjoiYmQ1NzlhZTYyZjg2ODE5N2I5OTk1YTFkOWM4NGZkOGFiNWIyYWI4Nzk5YzM0OWVmYjBkNjg1NWFiNDcwYWUzOTYyMzFmYzc5NjIxZDQxODciLCJpYXQiOjE3MjkxODU3MTguNjQxMjI1LCJuYmYiOjE3MjkxODU3MTguNjQxMjI"; $var(jwt_verification) = jwt_verify("/etc/kamailio/oauth_pub.pem", "RS256", "sub='$fU'", "$var(authorization_header_value)" ); ... ```

oauth_pub.pem: ``` -----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA5mfAgdn7JaiRS2Bsov4S zTlGLSe2wxbdUxIreTcqs88PmWOBtuSeQg5tU3CRnPtsuuRJrlUniV5g56YAHrnt Qe8meu877iTrcJB6Cii3n+d7SgwCfjMvaFBR+mdGsidAyGBpRhoPrH7SD6CRpBLr Mxylcgqw4uH/0HdF+B8P5motUQz/tul/UKsq1nvC2AOOzFel1IsUah8dQuxzMx+P RYcsngJam8TkGr6QidTXc2rD4lEoCD1s/huGUq55bc19J3yRliN2j8cO9j1bGTsp GYEVtA3PiH/73BZTa3FHbhRYqhvjYacC8eWBFhwThC9CgPyOXrq4L7p9tJAlNwmd dQHhIzZ9vugQuhfnuUTb0/r2tjpsSPL7etgJdxtZ4Xh9aBEpYn//RAgu5Dkauc2S XF+uLWwBptFTM3SNppDPMdjRkYakWjVP2pgBGMmrINFb8RQAPEJzD1gVt0fYCxaY jiazbSc9FPfSbFENHq+r8D7OivpiW0q9+tSZbYmAFzZekoUAoboQThSdRcOy9tFz 196xfg4dOyxkRGGHstz28qBv340ppjnHQd+RZOvbr8s2zEIxGiOpfX8CuLur/nKl Ld3qtzg0caqDz6nsYK+95rExnbtU+gFcHnwtMdk3R8X6lVHzDeTjO2Nk4Zo023zo qFH/rRyJBOp98fQPOpx5qncCAwEAAQ== -----END PUBLIC KEY----- ``` #### 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

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``` (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). -->

``` [jwt_mod.c:501]: ki_jwt_verify_key(): failed to decode jwt value ```

#### SIP Traffic

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``` (paste your sip traffic here) ```

--> ### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. --> I've wrote a C++ program using `libjwt` to make sure the issue is not neither my key, nor `libjwt`. And they aren't. Here is the program: ```cpp #include <iostream> #include <string> #include <jwt.h>

static const char jwt_test[] = "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.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.E_6jsC7yxPZgHRry55J0oOBzw25tvlfnWRBqSwLVFeAtavkVrYGmH9BGaByaAhebKNijy2WUg1X8Ug0N9Z9cc3P8u2wDSlvlzTNrxnPqdxMrKtP5wiIbImXboobFqKXLRmbor_9I7r0lBlX-e0xSis-PTaBqH40hDYPj0rR5cqnrszSkEMd2jFdiLL5BoF0pqysvrXA631KKA9oHGzAivib_GOddHeUOAVs7-hMVdnDqgrzZ6lDYkQndutrHpwILZWz09ngJBbRh_mN_cE4dDxghgeSotXADT-h5DlokV8ChkgkmHh6m4gU2lvnb7aY9dbCp9R44T1Rpz1P_HhPQ27p1Sgin40Oc2abBwDePw_chl0ajJHuhJCiK7YHbcmzcv3dZ-igVMYpMqhGIlyyuAHCSrKFVFLhodA1xlyCmMqJfFPOZ6DdKzbAQDWPN2xsCMy7WkGT5KmBQR5wWJRIRbTj4OUWo6iUrQdNyjB0F1RKqkuZlz414Hj0tkS5GlS1rfxOtS4yc2m_ERGomSmpDgoq2zpA5o3oJJWXqA7TzT8X_9Up5DkVQCMGW6Z2OT9Sr8hNjIXB1qgYiiZtNf9_b4bma5JEwVvR2-qcZ92V6owFTYx78smdyOgAaMlBQ_9AM6kARz4ZnC3Mz2feJT2qKLP-z9senqIB8k_xNx2lbU2w";

static unsigned char key[16384]; static size_t key_len;

static void read_key(const char *key_file) { FILE *fp = fopen(key_file, "r"); int ret = 0;

fp = fopen(key_file, "r");

key_len = fread(key, 1, sizeof(key), fp);

fclose(fp);

key[key_len] = '\0'; }

int main() { jwt_t *jwt = NULL;

int ret = 0;

read_key("oauth_pub.pem");

ret = jwt_decode(&jwt, jwt_test, key, key_len); printf("Decoding exit status: %d\n", ret); printf("User ID: %s\n", jwt_get_grant(jwt, "sub")); return 0; } ```

### Additional Information

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

``` version: kamailio 5.8.2 (x86_64/linux) 3fa5f4 flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, 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_SEND_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: 3fa5f4 compiled on 10:39:56 Jun 12 2024 with gcc 8.5.0 ```

* **Operating System**:

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``` Rocky Linux 8.10 (Green Obsidian) ```