SQL Server

X509Certificate GetCertHash SHA256

See more Certificates Examples

Shows how to get the SHA256 hash of a certificate. SQL Server

-- 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)
    DECLARE @success int
    SELECT @success = 0

    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Load a certificate object with a certificate.
    -- The certificate object could have come from any source,
    -- or perhaps was obtained from another Chilkat function.
    -- The source does not matter.  What matters is that we have
    -- a cert object loaded with the certificate..
    EXEC sp_OAMethod @cert, 'LoadFromFile', @success OUT, 'qa_data/certs/cert_test123.cer'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    -- Get the binary DER of the certificae, and compute the SHA256 hash:
    DECLARE @bdDer int
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bdDer OUT

    EXEC sp_OAMethod @cert, 'ExportCertDerBd', @success OUT, @bdDer

    -- Get the base64 representation of the SHA256 hash.
    DECLARE @certHash nvarchar(4000)
    EXEC sp_OAMethod @bdDer, 'GetHash', @certHash OUT, 'sha256', 'base64'


    PRINT 'Certificate hash in base64 = ' + @certHash

    EXEC @hr = sp_OADestroy @cert
    EXEC @hr = sp_OADestroy @bdDer


END
GO