Exception while saving an empty string to the dataset

[daniel3303]

The following exception occurs while saving an empty string to the dataset.
It appears that Convert.ToBase64String() is receiving a null array since the string to save is empty.

Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while saving the entity changes. See the inner exception for details.
       ---> System.ArgumentNullException: Value cannot be null. (Parameter 'inArray')
         at System.Convert.ToBase64String(Byte[] inArray)
         at Microsoft.EntityFrameworkCore.DataEncryption.Internal.EncryptionConverter`2.Encrypt[TInput,TOutput](TInput input, IEncryptionProvider encryptionProvider, StorageFormat storageFormat)
         at Microsoft.EntityFrameworkCore.Storage.ValueConversion.ValueConverter`2.<>c__DisplayClass4_0`2.<SanitizeConverter>b__1(Object v)
         at Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping.CreateParameter(DbCommand command, String name, Object value, Nullable`1 nullable)
         at Microsoft.EntityFrameworkCore.Storage.Internal.TypeMappedRelationalParameter.AddDbParameter(DbCommand command, Object value)
         at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalParameterBase.AddDbParameter(DbCommand command, IReadOnlyDictionary`2 parameterValues)
         at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.CreateDbCommand(RelationalCommandParameterObject parameterObject, Guid commandId, DbCommandMethod commandMethod)
         at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReader(RelationalCommandParameterObject parameterObject)
         at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
         --- End of inner exception stack trace ---
         at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
         at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
         at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IList`1 entries)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IList`1 entriesToSave)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(StateManager stateManager, Boolean acceptAllChangesOnSuccess)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.<>c.<SaveChanges>b__104_0(DbContext _, ValueTuple`2 t)
         at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.<>c__DisplayClass31_0`2.<Execute>b__0(DbContext context, TState state)
         at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.ExecuteImplementation[TState,TResult](Func`3 operation, Func`3 verifySucceeded, TState state)
         at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
         at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)
      Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while saving the entity changes. See the inner exception for details.
       ---> System.ArgumentNullException: Value cannot be null. (Parameter 'inArray')
         at System.Convert.ToBase64String(Byte[] inArray)
         at Microsoft.EntityFrameworkCore.DataEncryption.Internal.EncryptionConverter`2.Encrypt[TInput,TOutput](TInput input, IEncryptionProvider encryptionProvider, StorageFormat storageFormat)
         at Microsoft.EntityFrameworkCore.Storage.ValueConversion.ValueConverter`2.<>c__DisplayClass4_0`2.<SanitizeConverter>b__1(Object v)
         at Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping.CreateParameter(DbCommand command, String name, Object value, Nullable`1 nullable)
         at Microsoft.EntityFrameworkCore.Storage.Internal.TypeMappedRelationalParameter.AddDbParameter(DbCommand command, Object value)
         at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalParameterBase.AddDbParameter(DbCommand command, IReadOnlyDictionary`2 parameterValues)
         at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.CreateDbCommand(RelationalCommandParameterObject parameterObject, Guid commandId, DbCommandMethod commandMethod)
         at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReader(RelationalCommandParameterObject parameterObject)
         at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
         --- End of inner exception stack trace ---
         at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
         at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
         at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IList`1 entries)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IList`1 entriesToSave)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(StateManager stateManager, Boolean acceptAllChangesOnSuccess)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.<>c.<SaveChanges>b__104_0(DbContext _, ValueTuple`2 t)
         at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.<>c__DisplayClass31_0`2.<Execute>b__0(DbContext context, TState state)
         at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.ExecuteImplementation[TState,TResult](Func`3 operation, Func`3 verifySucceeded, TState state)
         at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
         at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)

[Eastrall]

It seems that I missed a null check here:

EntityFrameworkCore.DataEncryption/src/EntityFrameworkCore.DataEncryption/Internal/EncryptionConverter.cs

Lines 38 to 46 in 9585f48

	byte[] encryptedRawBytes = encryptionProvider.Encrypt(inputData);
	object encryptedData = storageFormat switch
	{
	StorageFormat.Default or StorageFormat.Base64 => Convert.ToBase64String(encryptedRawBytes),
	_ => encryptedRawBytes
	};
	return (TOutput)Convert.ChangeType(encryptedData, typeof(TOutput));

When passing a null value to the encryptionProvider.Encrypt(inputData); the built-in AesProvider returns a null value. We should check the null value before converting it into a Base64 string.

Thanks for reporting that, I'll provide a fix asap.

[Eastrall]

A fix has been deployed in version 4.0.1 : https://github.com/Eastrall/EntityFrameworkCore.DataEncryption/releases/tag/v4.0.1

Feel free to reopen if you still have the issue.