(SQL Server) MD5 Hash a String (such as a password string)

Demonstrates how to MD5 hash a string to get MD5 hash in hex encoded string representation. (The MD5 hash is 16 bytes, and therefore a hex encoded MD5 hash would be 32 chars.)

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 @password nvarchar(4000)
    SELECT @password = 'myPassword'

    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

    EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'md5'
    EXEC sp_OASetProperty @crypt, 'EncodingMode', 'hex'
    DECLARE @md5Hex nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'HashStringENC', @md5Hex OUT, @password

    PRINT 'MD5 hash (as a hex string) = ' + @md5Hex

    -- The hex string will be uppercase.  Your application
    -- can easily convert it to lowercase if desired via non-Chilkat means.

    EXEC @hr = sp_OADestroy @crypt


END
GO