(SQL Server) Calculate MD5 Hash of File (or SHA1, SHA256, and other hash algorithms)

Demonstrates how to calculate a hash for a file's contents.

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
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample 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

    -- Set the name of the hash algorithm.
    -- Other choices include "sha1", "sha256", "sha384", "sha512", "md2", "md5", and "haval". 
    EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'md5'

    -- EncodingMode specifies the encoding of the hash output.
    -- It may be "hex", "url", "base64", or "quoted-printable".
    EXEC sp_OASetProperty @crypt, 'EncodingMode', 'hex'

    -- Files of any type may be hashed -- it doesn't matter
    -- if the file is binary or text...
    DECLARE @hashStr nvarchar(4000)

    EXEC sp_OAMethod @crypt, 'HashFileENC', @hashStr OUT, '/temp/something.dat'
    EXEC sp_OAGetProperty @crypt, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        RETURN
      END


    PRINT @hashStr

    EXEC @hr = sp_OADestroy @crypt


END
GO