[monitoring-plugins] Fix hash creation

[RincewindsHat]

 Module: monitoring-plugins
 Branch: master
 Commit: f6f2ba34c713b5bc65936af836be24ebc74faf46
 Author: RincewindsHat <12514511+rincewinds...@users.noreply.github.com>
   Date: Sun Mar 12 13:58:25 2023 +0100
    URL: 
https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=f6f2ba3

Fix hash creation

---

 lib/utils_base.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/lib/utils_base.c b/lib/utils_base.c
index 39032cb..105ff44 100644
--- a/lib/utils_base.c
+++ b/lib/utils_base.c
@@ -404,9 +404,15 @@ int mp_translate_state (char *state_text) {
 char *_np_state_generate_key() {
        int i;
        char **argv = this_monitoring_plugin->argv;
-       unsigned char result[20];
        char keyname[41];
        char *p=NULL;
+
+       unsigned char *result = malloc(256 * sizeof(unsigned char));
+
+       if (result == NULL) {
+               die(STATE_UNKNOWN, _("Failed to allocate memory for hashes: 
%s"), strerror(errno));
+       }
+
 #ifdef USE_OPENSSL
        /*
         * This code path is chosen if openssl is available (which should be 
the most common
@@ -421,16 +427,22 @@ char *_np_state_generate_key() {
                EVP_DigestUpdate(ctx, argv[i], strlen(argv[i]));
        }
 
-       EVP_DigestFinalXOF(ctx, &result, 20);
+       EVP_DigestFinal(ctx, result, NULL);
 #else
+
        struct sha256_ctx ctx;
 
        for(i=0; i<this_monitoring_plugin->argc; i++) {
                sha256_process_bytes(argv[i], strlen(argv[i]), &ctx);
        }
 
-       sha256_finish_ctx(&ctx, &result);
+       sha256_finish_ctx(&ctx, result);
 #endif // FOUNDOPENSSL
+
+       for (i=0; i<20; ++i) {
+               sprintf(&keyname[2*i], "%02x", result[i]);
+       }
+
        keyname[40]='\0';
 
        p = strdup(keyname);