Decrypt the hashed password in SQL Server 2008

Hello all,
I have used HASHBYTES to decrypt the password of the user using SHA1, so now there is a requirement to decypt back the password  to its original form, 
for eg
Pass word is 'Jhon' so after applying HASHBYTES('SHA1','Jhon') it gices the output as "0xB13B42158655F36814F3C4541C6457F7CAD0F719"
Now i want back to get Jhon from the encypted value.
Please suggest an idea to do so.
Thanks for advance.
Pankaj Kumar Yadav-

To expand on what Dan says above, one can use pwdencrypt/pwdcompare from SQL but in a different context (http://stackoverflow.com/questions/173329/how-to-decrypt-a-password-from-sql-server). 
The context would be more like the one that is used to determine whether your user passes a CORRECT password.  In this case, the hash value saved in the database must be the same as the hash value of the password being passed in.  In this
manner, while you can't decrypt, you can determine whether the user knows the password or not without storing the password.  Not the best way to enable a password, but a workaround for sure. Similar to Dan's method above but may provide a bit more
detail as to the why's and wherefore's using the examples listed there.
R, J

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    Detail description of this patch package is: PatchId=KB2977321_sql_rs_Cpu64 PatchVersion=10.3.5520.0 BaselinePackageId=sql_rs_Cpu64 BaselineVersion=10.3.5500.0; PatchFileName=sql_rs.msp PatchCode={2296F7DD-2D3D-4802-B61A-AE7460EFB767}
    2014-11-18 19:16:30 Slp: Patch Id: KB2977321_sql_rs_Cpu32 - The baseline msi is not installed. 
    The patch package is ignored.
    2014-11-18 19:16:30 Slp: Patch Id: KB2977321_sql_rs_Cpu32 - Detail description of this patch package is: PatchId=KB2977321_sql_rs_Cpu32 PatchVersion=10.3.5520.0 BaselinePackageId=sql_rs_Cpu32 BaselineVersion=10.3.5500.0;
    PatchFileName=sql_rs.msp PatchCode={2296F7DD-2D3D-4802-B61A-AE7460EFB767}
    2014-11-18 19:16:30 Slp: Baseline Package Id sql_is_Cpu64 - The highest patch version is 10.3.5500.0
    2014-11-18 19:16:30 Slp: Patch Id KB2977321_sql_is_Cpu64 - NotInstalled on the baseline msi package sql_is_Cpu64. 
    Detail description of this patch package is: PatchId=KB2977321_sql_is_Cpu64 PatchVersion=10.3.5520.0 BaselinePackageId=sql_is_Cpu64 BaselineVersion=10.3.5500.0; PatchFileName=sql_is.msp PatchCode={E870296C-24CC-4D82-BB59-CD136692E2BD}
    2014-11-18 19:16:30 Slp: Baseline Package Id sql_bids_Cpu64 - The highest patch version is 10.3.5500.0
    2014-11-18 19:16:30 Slp: Patch Id KB2977321_sql_bids_Cpu64 - NotInstalled on the baseline msi package sql_bids_Cpu64. 
    Detail description of this patch package is: PatchId=KB2977321_sql_bids_Cpu64 PatchVersion=10.3.5520.0 BaselinePackageId=sql_bids_Cpu64 BaselineVersion=10.3.5500.0; PatchFileName=sql_bids.msp PatchCode={EA407FA6-C2D1-4D3D-9227-B9E06DDDEFD0}
    2014-11-18 19:16:30 Slp: Baseline Package Id sql_ssms_Cpu64 - The highest patch version is 10.3.5500.0
    2014-11-18 19:16:30 Slp: Patch Id KB2977321_sql_ssms_Cpu64 - NotInstalled on the baseline msi package sql_ssms_Cpu64. 
    Detail description of this patch package is: PatchId=KB2977321_sql_ssms_Cpu64 PatchVersion=10.3.5520.0 BaselinePackageId=sql_ssms_Cpu64 BaselineVersion=10.3.5500.0; PatchFileName=sql_ssms.msp PatchCode={8A81B870-E8F0-415D-AC80-13BEAA3EC8C8}
    2014-11-18 19:16:30 Slp: Baseline Package Id: sql_common_core_Cpu64 - No patches are found by SQL Discovery on the installed package whose ProductCode is {5340A3B5-3853-4745-BED2-DD9FF5371331}
    2014-11-18 19:16:30 Slp: Patch Id KB2977321_sql_common_core_Cpu64 - NotInstalled on the baseline msi package sql_common_core_Cpu64. 
    Detail description of this patch package is: PatchId=KB2977321_sql_common_core_Cpu64 PatchVersion=10.3.5520.0 BaselinePackageId=sql_common_core_Cpu64 BaselineVersion=10.3.5500.0; PatchFileName=sql_common_core.msp PatchCode={CF023E0F-3A19-4DBF-BCA3-0F664B447EDB}
    The instance came up successfully and seems to be operating normally. Was there an error or was the KB installed correctly as the result of the windows update process indicated? 
    Is there a way I can verify this? 

    I did some research on this particular KB article and it seems to be related to Master Data Services which I am not using.  The KB was pushed automatically and I am not sure that it was a required update in our situation. I'd like to understand exactly
    what caused the error message before initiating a repair as this is a production and not a test environment.  Everything appears to be functioning properly and I have received direction from Microsoft in the past that information in some logs identified
    as level 'error' are in fact to be ignored.  I checked the windows update and this KB shows 'Successful' rather than failed or cancelled.
    I would also like more information on why sql server services should not be stopped prior to allowing the OS patches to be applied.   I have received messages in the past that stopping the services before service packs are applied
    prevent the necessity for a reboot of the machine.  I've never heard before that it is a best practice not to stop Sql service prior to applying patches.  Once the services are stopped, I have our infrastructure admin start a VM snapshot on
    the machine then kick off the windows update process. When done, I reboot the machine, test out Sql Server processes and then if all goes well give the ok to release the VM snapshot.  I've supported various databases for 12 years, Sql Server for 5
    years and this is the first time I've heard stopping the service manually can cause problems.  If that is the case, I will certainly change how I do things....
    I did run the discovery report and the results follow:
    Microsoft SQL Server 2008 Setup Discovery Report
    Product
    Instance
    Instance ID
    Feature
    Language
    Edition
    Version
    Clustered
    Sql Server 2008
    MSSQLSERVER
    MSSQL10.MSSQLSERVER
    Database Engine Services
    1033
    Standard Edition
    10.3.5520.0
    No
    Sql Server 2008
    MSSQLSERVER
    MSSQL10.MSSQLSERVER
    SQL Server Replication
    1033
    Standard Edition
    10.3.5520.0
    No
    Sql Server 2008
    MSSQLSERVER
    MSSQL10.MSSQLSERVER
    Full-Text Search
    1033
    Standard Edition
    10.3.5500.0
    No
    Sql Server 2008
    MSSQLSERVER
    MSAS10.MSSQLSERVER
    Analysis Services
    1033
    Standard Edition
    10.3.5500.0
    No
    Sql Server 2008
    MSSQLSERVER
    MSRS10.MSSQLSERVER
    Reporting Services
    1033
    Standard Edition
    10.3.5520.0
    No
    Sql Server 2008
    EVAULT
    MSSQL10.EVAULT
    Database Engine Services
    1033
    Standard Edition
    10.3.5520.0
    No
    Sql Server 2008
    Management Tools - Basic
    1033
    Standard Edition
    10.3.5520.0
    No
    Sql Server 2008
    Management Tools - Complete
    1033
    Standard Edition
    10.3.5500.0
    No
    Sql Server 2008
    Client Tools Connectivity
    1033
    Standard Edition
    10.3.5500.0
    No
    Sql Server 2008
    Client Tools Backwards Compatibility
    1033
    Standard Edition
    10.3.5500.0
    No
    Sql Server 2008
    Client Tools SDK
    1033
    Standard Edition
    10.3.5500.0
    No
    Sql Server 2008
    Integration Services
    1033
    Standard Edition
    10.3.5520.0
    No

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