Generate Hash Key in SQL Server 2005 using SHA 512 algorithm

try:-

Declare @crypt NVARCHAR(100);
set @crypt='test';

EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'sha256'
 EXEC sp_OAMethod @crypt, 'HashStringENC', @hash OUT, @s

 PRINT 'SHA256:'

 PRINT @hash

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before running the above sql you will have to "Enable Ole automation" for SQL Server.
Follow these steps:-

start -> programs ->MS sql 2005 -> configuration tools -> surfce area configuration -> Surface area conf for features ->

Ole automation -> select the Enable check box and save

OLE Automation can also be enabled through:-

exec sp_configure 'Ole Automation Procedures', 1
go
reconfigure
go

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Depending on the length of the string, you can possibly use HASHBYTES.  Hashbytes supports SHA and SHA1.

http://msdn.microsoft.com/en-us/library/ms174415%28v=sql.90%29.aspx

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