feat: Waku v2 bridge

Issue #12610

vendor/github.com/mutecomm/go-sqlcipher/v4/crypt_register_prng.c

@@ -0,0 +1,42 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+  @file crypt_register_prng.c
+  Register a PRNG, Tom St Denis
+*/
+
+/**
+   Register a PRNG with the descriptor table
+   @param prng   The PRNG you wish to register
+   @return value >= 0 if successfully added (or already present), -1 if unsuccessful
+*/
+int register_prng(const struct ltc_prng_descriptor *prng)
+{
+   int x;
+
+   LTC_ARGCHK(prng != NULL);
+
+   /* is it already registered? */
+   LTC_MUTEX_LOCK(&ltc_prng_mutex);
+   for (x = 0; x < TAB_SIZE; x++) {
+       if (XMEMCMP(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor)) == 0) {
+          LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
+          return x;
+       }
+   }
+
+   /* find a blank spot */
+   for (x = 0; x < TAB_SIZE; x++) {
+       if (prng_descriptor[x].name == NULL) {
+          XMEMCPY(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor));
+          LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
+          return x;
+       }
+   }
+
+   /* no spot */
+   LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
+   return -1;
+}