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FIX: DecryptByKeyAutoAsymKey() function returns "NULL" value when you decrypt data that is encrypted by an asymmetric key in SQL Server

Consider the following scenario:
  • You have a symmetric key that is encrypted by an asymmetric key in Microsoft SQL Server 2008 R2, SQL Server 2012, or SQL Server 2014.
  • The asymmetric key is created by using an Extensible Key Management (EKM) provider.
  • You use the DecryptByKeyAutoAsymKey() function to decrypt the data that is encrypted by the symmetric key.
In this scenario, the DecryptByKeyAutoAsymKey() function returns "NULL" value.
The issue was first fixed in the following cumulative update of SQL Server.

Cumulative Update 1 for SQL Server 2014

Cumulative Update 8 for SQL Server 2012 SP1

Cumulative Update 11 for SQL Server 2012

Cumulative Update 9 for SQL Server 2008 R2 SP2

About cumulative updates for SQL Server

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Article ID: 2878377 - Last Review: 04/21/2014 21:03:00 - Revision: 4.0

Microsoft SQL Server 2008 R2 Service Pack 2, Microsoft SQL Server 2012 Developer, Microsoft SQL Server 2012 Enterprise, Microsoft SQL Server 2012 Standard, Microsoft SQL Server 2012 Service Pack 1, Microsoft SQL Server 2014 Developer, Microsoft SQL Server 2014 Enterprise, Microsoft SQL Server 2014 Standard

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