Encrypt On CLR Decrypt In SQL?

Jan 8, 2008



Hi folks,
I'm trying to encrypt a small token of data on my client c# application and have it decrypted by SQL on the server side, the problem is i cannot find articles on the subject. I don;t really want to get involved with certificates but base the system on a simple symmetric key that is shared by both parties.

I'm attempting to use the TRIPLE_DES algorithm on both sides and thus far have used the decryptbypassphrase on the server side with the data encrypted on the client side by .Net with no initialization vector setup.

If anyone can recommend any articles or have example (client and server side) code for this situation it would be greatly appreciated.

Many thanks in advance

Simon

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Jul 22, 2002

Hi Guys.


I am looking for TSQL code for RC4 encryption and decryption.

I found VBcode for RC4 encryption, it will take atleast 2 days for me to go thru that and rewrite the whole code in SQL.

If anyone has the code, please provide me.

(I know sql does accept extended ASCII characters)

Thanks
-MAK

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what i want is every time i insert a value to the password column that value should be encrypted first.


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hi all,
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thanks guys

~~~Focus on problem, not solution ¯(º_o)/¯ ~~~

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Hi,
When I run the package it gives the following error warning.
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P.S. The package runs successfully and loads data but not sure why I get this error.
Thanks

Error: 2007-08-29 06:00:13.70
Code: 0xC0016016
Source:
Description: Failed to decrypt protected XML node "DTSassword" with error 0x8009000B "Key not valid for use in specified state.". You may not be authorized to access this information. This error occurs when there is a cryptographic error. Verify that
the correct key is available.
End Error

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Hi all.

The new feature of login encryption still tortured me and my company's fellow :(

We can't use the server's profile nor server's login audit functionality.
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So..

I know that self signed certi generated whenever the MSSQL server started. My question is..

1. Where is that self-signed certification. Is it loaded to memory or physical hard disk.

2. Is there any special 'store' for this self-signed certification?
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3. Is there any api that find and decrypt this login info?

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Jan 19, 2007

Hi... I want to encrypt data using a symmetric key + certificate, but it appears anyone with simply "db_datareader" can view the decrypted data? Is this correct?

Recreation steps:

1. As a System Admin, log into a SQL 2005 Database Engine.
2. Create some login that you also have access to. Ensure it does not already exist, or inherit any permissions from some existing NT-group. (From here on out, I will refer to it as the "underpriveleged user".)
3. Create a new database of any name.
4. Run the following query against the database:

CREATE TABLE [dbo].[MyTable](
[MyColumn] [varbinary](50) NULL
) ON [PRIMARY]
GO
CREATE USER [DOMAINUserName]
FOR LOGIN [DOMAINUserName] WITH DEFAULT_SCHEMA=[dbo]
sp_addrolemember 'db_owner', 'DOMAINUserName'

5. Now open another SSMS and connect as that underpriveleged user.
6. Change the database to the name you provided in Step 3.
7. Run these commands as the underpriveleged user...

CREATE MASTER KEY ENCRYPTION BY PASSWORD='DbMK_pwd'

CREATE CERTIFICATE MyCertificate WITH SUBJECT='Some Text'
CREATE SYMMETRIC KEY MyKeyName
WITH ALGORITHM = DESX
ENCRYPTION BY CERTIFICATE MyCertificate

OPEN SYMMETRIC KEY MyKeyName
DECRYPTION BY CERTIFICATE MyCertificate
INSERT INTO MyTable(MyColumn)
VALUES (EncryptByKey(Key_GUID('MyKeyName'), 'MyValue'))
SELECT Convert(varchar,DecryptByKey(MyColumn)) FROM MyTable
CLOSE SYMMETRIC KEY MyKeyName

8. Now switch back to the System Admin session, and revoke most of the underpriveleged account's permissions...

sp_droprolemember 'db_owner', 'DOMAINUserName'
GRANT SELECT ON dbo.MyTable TO [DOMAINUserName]

9. Switch once again to the underpriveleged session, and run the following:

OPEN SYMMETRIC KEY MyKeyName DECRYPTION BY CERTIFICATE MyCertificate
SELECT *, Convert(varchar,DecryptByKey(MyColumn)) FROM MyTable
CLOSE SYMMETRIC KEY MyKeyName


Why does this work? The user only has select access against the table, and no explicit permissions to the certificate or key. I have even disconnected as this user, tried again, restarted SQL Server... it is still able to decrypt the text.

Or what should I be doing to ensure only those with access to the key/certificate can decrypt the cipher text?

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Nov 28, 2006

I'm still having issues with this despite my attempts to resolve. I even
have "with exec as dbo" in my sproc, and and "exec as dbo" in my execution,
but still the encrypted data returns nulls when I exec as a user other than
DBO. Below is precisely what I have done. All ideas are welcomed.

TIA, ChrisR


--If there is no master key, create one now

IF NOT EXISTS
(SELECT * FROM sys.symmetric_keys WHERE symmetric_key_id = 101)
CREATE MASTER KEY ENCRYPTION BY
PASSWORD =
'23987hxJKL95QYV4369#ghf0%94467GRdkjuw54ie5y01478d Dkjdahflkujaslekjg5k3fd117
r$$#1946kcj$n44ncjhdlj'
GO

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WITH SUBJECT = 'Employee Social Security Numbers';
GO

CREATE SYMMETRIC KEY SSN_Key_01
WITH ALGORITHM = DES
ENCRYPTION BY CERTIFICATE HumanResources037;
GO

USE [AdventureWorks];
GO

-- Create a column in which to store the encrypted data
ALTER TABLE HumanResources.Employee
ADD EncryptedNationalIDNumber varbinary(128);
GO

-- Open the symmetric key with which to encrypt the data
OPEN SYMMETRIC KEY SSN_Key_01
DECRYPTION BY CERTIFICATE HumanResources037;

-- Encrypt the value in column NationalIDNumber with symmetric
-- key SSN_Key_01. Save the result in column EncryptedNationalIDNumber.
UPDATE HumanResources.Employee
SET EncryptedNationalIDNumber = EncryptByKey(Key_GUID('SSN_Key_01'),
NationalIDNumber);
GO

-- Verify the encryption.
-- First, open the symmetric key with which to decrypt the data
OPEN SYMMETRIC KEY SSN_Key_01
DECRYPTION BY CERTIFICATE HumanResources037;
GO

-- Now list the original ID, the encrypted ID, and the
-- decrypted ciphertext. If the decryption worked, the original
-- and the decrypted ID will match.

alter procedure getDecryptedIDNumber
with exec as owner
as
SELECT NationalIDNumber, EncryptedNationalIDNumber
AS "Encrypted ID Number",
CONVERT(nvarchar, DecryptByKey(EncryptedNationalIDNumber))
AS "Decrypted ID Number"
FROM HumanResources.Employee;
GO

/*works for me, shows the decrypted data*/

exec getDecryptedIDNumber

USE [master]
GO

CREATE LOGIN [test] WITH PASSWORD=N'test',
DEFAULT_DATABASE=[AdventureWorks], CHECK_EXPIRATION=OFF, CHECK_POLICY=OFF
GO

USE [AdventureWorks]
GO

CREATE USER [test] FOR LOGIN [test]
GO

use [AdventureWorks]
GO

GRANT EXECUTE ON [dbo].[getDecryptedIDNumber] TO [test]
GO

GRANT IMPERSONATE ON USER:: dbo TO test;
GO

/*Now, open up a "file/new/DB Engine Query" and login with the test login*/
exec as user = 'dbo'
exec getDecryptedIDNumber

/*This returns NULL values where it should show the decrypted data*/

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-- )

[Code] .....

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Hi,

I,ve been searching the forum for answers to this error but with no luck:

Failed to decrypt protected XML node "DTSassword" with error 0x80070002 "The system cannot find the file specified.". You may not be authorized to access this information. This error occurs when there is a cryptographic error. Verify that the correct key is available.


Setup:
I'm running the packages from the SQL Job Agent - the packages are stored in the file system. The agent is using a proxy account to get the right permissions. I know this because the job has run for severel weeks without errors. The package is calling other packages and is using configuration files. It was actually more than on job that failed (with the same error) - but not all the jobs.

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Regards
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May 12, 2008



Hi All,

I am trying to run a job and when I run it I get the following error:

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http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=384472&SiteID=1
I suppose that some of the answer to my question may be found in that topic, but I haven't made much progress.
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<?xml version="1.0" encoding="utf-8"?>

<EncryptedData Type="http://www.w3.org/2001/04/xmlenc#Element" xmlns="http://www.w3.org/2001/04/xmlenc#">

<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes256-cbc" />

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<EncryptedKey xmlns="http://www.w3.org/2001/04/xmlenc#">

<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-1_5" />

<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">

<X509Data>

<X509Certificate>[A Bunch of jumbled characters]</X509Certificate>

</X509Data>

</KeyInfo>

<CipherData>

<CipherValue>[A Bunch of jumbled characters]</CipherValue>

</CipherData>

</EncryptedKey>

</KeyInfo>

<CipherData>

<CipherValue>[A Bunch of jumbled characters]</CipherValue>

</CipherData>

</EncryptedData>

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Hi

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Executed as user: SEA-SRV-00009SYSTEM. Microsoft (R) SQL Server Execute Package Utility Version 9.00.3042.00 for 64-bit Copyright (C) Microsoft Corp 1984-2005. All rights reserved. Started: 10:07:29 PM Error: 2007-12-05 22:07:29.78 Code: 0xC0016016 Source: Description: Failed to decrypt protected XML node "DTSassword" with error 0x8009000B "Key not valid for use in specified state.". You may not be authorized to access this information. This error occurs when there is a cryptographic error. Verify that the correct key is available. End Error DTExec: The package execution returned DTSER_SUCCESS (0). Started: 10:07:29 PM Finished: 10:07:33 PM Elapsed: 4.188 seconds. The package executed successfully. The step succeeded.

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