Merge pull request #1248 from firebase/rosalyntan.snippet

Add region tags

Author: rosalyntan

authentication/LegacyAuthQuickstart/AuthenticationExample/MainViewController.m

@@ -1066,6 +1066,8 @@ - (void)startSignInWithAppleFlow {
   [authorizationController performRequests];
 }
 
+// [START random_nonce]
+// Adapted from https://auth0.com/docs/api-auth/tutorials/nonce#generate-a-cryptographically-random-nonce
 - (NSString *)randomNonce:(NSInteger)length {
   NSAssert(length > 0, @"Expected nonce to have positive length");
   NSString *characterSet = @"0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz-._";
@@ -1097,7 +1099,9 @@ - (NSString *)randomNonce:(NSInteger)length {
 
   return [result copy];
 }
+// [END random_nonce]
 
+// [START sha_256]
 - (NSString *)stringBySha256HashingString:(NSString *)input {
   const char *string = [input UTF8String];
   unsigned char result[CC_SHA256_DIGEST_LENGTH];
@@ -1109,6 +1113,7 @@ - (NSString *)stringBySha256HashingString:(NSString *)input {
   }
   return hashed;
 }
+// [END sha_256]
 
 - (void)authorizationController:(ASAuthorizationController *)controller
    didCompleteWithAuthorization:(ASAuthorization *)authorization API_AVAILABLE(ios(13.0)) {

authentication/LegacyAuthQuickstart/AuthenticationExampleSwift/MainViewController.swift

@@ -1040,6 +1040,7 @@ class MainViewController: UITableViewController {
     authorizationController.performRequests()
   }
 
+  // [START random_nonce]
   // Adapted from https://auth0.com/docs/api-auth/tutorials/nonce#generate-a-cryptographically-random-nonce
   private func randomNonceString(length: Int = 32) -> String {
     precondition(length > 0)
@@ -1075,6 +1076,9 @@ class MainViewController: UITableViewController {
     return result
   }
 
+  // [END random_nonce]
+
+  // [START sha_256]
   @available(iOS 13, *)
   private func sha256(_ input: String) -> String {
     let inputData = Data(input.utf8)
@@ -1085,6 +1089,8 @@ class MainViewController: UITableViewController {
 
     return hashString
   }
+
+  // [END sha_256]
 }
 
 @available(iOS 13.0, *)