Move the secure-random code into this project due to build issues with the module, which is no longer maintained

ios/AppSecureRandomModule.m

@@ -0,0 +1,27 @@
+#import "AppSecureRandomModule.h"
+
+@implementation AppSecureRandomModule
+
+RCT_EXPORT_MODULE();
+
++ (BOOL)requiresMainQueueSetup
+{
+    return NO;
+}
+
+RCT_REMAP_METHOD(generateSecureRandomAsBase64,
+                 withLength:(int)length
+                 resolver:(RCTPromiseResolveBlock)resolve
+                 rejecter:(RCTPromiseRejectBlock)reject)
+{
+  NSMutableData* bytes = [NSMutableData dataWithLength:length];
+  int result = SecRandomCopyBytes(kSecRandomDefault,length, [bytes mutableBytes]);
+  if (result == errSecSuccess) {
+    resolve([bytes base64EncodedStringWithOptions:0]);
+  } else {
+    NSError *error = [NSError errorWithDomain:@"RNSecureRandom" code:result userInfo: nil];
+    reject(@"randombytes_error", @"Error generating random bytes", error);
+  }
+}
+
+@end