(SQL Server) Hash the Contents of a String (SHA256 and other hash algorithms)

Demonstrates how to hash the contents of a string using SHA256, SHA384, SHA512, MD2, MD5, HAVAL, RIPEMD, etc.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat Crypt API to have been previously unlocked.
    -- See Unlock Chilkat Crypt for sample code.

    DECLARE @crypt int
    -- Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Choose the hash algorithm.
    -- Can be  "sha1", "sha256", "sha384", "sha512", "md2", "md5", "haval", "ripemd128", "ripemd160","ripemd256", or "ripemd320".
    EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'sha256'

    -- The byte representation of the string matters when hashing. 
    -- Tell Chilkat that we want to use the utf-8 byte representation.
    EXEC sp_OASetProperty @crypt, 'Charset', 'utf-8'

    EXEC sp_OAMethod @crypt, 'HashString', @hashBytes OUT, 'They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.'

    -- Let's examine the hash as a hex string.
    DECLARE @sb int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb OUT

    DECLARE @success int
    EXEC sp_OAMethod @sb, 'AppendEncoded', @success OUT, @hashBytes, 'hex'

    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT 'SHA256 hash = ' + @sTmp0

    EXEC @hr = sp_OADestroy @crypt
    EXEC @hr = sp_OADestroy @sb


END
GO