diff --git a/native/ios/Comm/TemporalMessageStorage/EncryptedFileUtils.mm b/native/ios/Comm/TemporalMessageStorage/EncryptedFileUtils.mm
--- a/native/ios/Comm/TemporalMessageStorage/EncryptedFileUtils.mm
+++ b/native/ios/Comm/TemporalMessageStorage/EncryptedFileUtils.mm
@@ -10,3 +10,76 @@
 + (NSData *)_encryptData:(NSString *)data error:(NSError **)error;
 + (NSString *)_decryptBinary:(NSData *)binary error:(NSError **)error;
 @end
+
+@implementation EncryptedFileUtils
++ (NSData *)_encryptData:(NSString *)data error:(NSError **)error {
+  NSUInteger paddingLength =
+      data.length + kCCBlockSizeAES128 - data.length % kCCBlockSizeAES128;
+  NSString *paddedData = [[encryptedDataSeparator stringByAppendingString:data]
+      stringByPaddingToLength:paddingLength
+                   withString:encryptedDataSeparator
+              startingAtIndex:0];
+  return [EncryptedFileUtils
+      _runCryptor:[paddedData dataUsingEncoding:NSUTF8StringEncoding]
+        operation:kCCEncrypt
+            error:error];
+}
+
++ (NSString *)_decryptBinary:(NSData *)binary error:(NSError **)error {
+  NSString *decryptedData =
+      [[NSString alloc] initWithData:[EncryptedFileUtils _runCryptor:binary
+                                                           operation:kCCDecrypt
+                                                               error:error]
+                            encoding:NSUTF8StringEncoding];
+  return [decryptedData
+      stringByTrimmingCharactersInSet:NSCharacterSet.newlineCharacterSet];
+}
+
++ (NSData *)_runCryptor:(NSData *)binary
+              operation:(CCOperation)operation
+                  error:(NSError **)err {
+  NSString *keyString =
+      [[CommSecureStoreIOSWrapper sharedInstance] get:@"comm.encryptionKey"];
+  if (!keyString) {
+    *err = [NSError
+        errorWithDomain:@"app.comm"
+                   code:NSCoderValueNotFoundError
+               userInfo:@{
+                 NSLocalizedDescriptionKey : @"Encryption key not created yet"
+               }];
+    return nil;
+  }
+
+  NSUInteger AES256KeyByteCount = 32;
+  NSData *key = [[keyString substringToIndex:AES256KeyByteCount]
+      dataUsingEncoding:NSUTF8StringEncoding];
+  NSMutableData *resultBinary = [NSMutableData dataWithLength:binary.length];
+
+  size_t processedBytes = 0;
+  CCCryptorStatus ccStatus = CCCrypt(
+      operation,
+      kCCAlgorithmAES,
+      kCCOptionECBMode,
+      key.bytes,
+      key.length,
+      nil,
+      binary.bytes,
+      binary.length,
+      resultBinary.mutableBytes,
+      resultBinary.length,
+      &processedBytes);
+
+  resultBinary.length = processedBytes;
+  if (ccStatus != kCCSuccess) {
+    *err = [NSError
+        errorWithDomain:@"app.comm"
+                   code:ccStatus
+               userInfo:@{
+                 NSLocalizedDescriptionKey : @"Cryptographic operation failed"
+               }];
+    return nil;
+  }
+  return resultBinary;
+}
+
+@end