SQL Server

Create PEM-encoded PKCS#7 Detached Signature

See more Digital Signatures Examples

Demonstrates how to create a PKCS7 PEM-encoded object containing a detached signature. 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
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

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

    -- Load the cert and private key.
    EXEC sp_OAMethod @cert, 'LoadPfxFile', @success OUT, 'qa_data/pfx/myCertAndKey.p12', 'password'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    DECLARE @crypt int
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT

    EXEC sp_OAMethod @crypt, 'SetSigningCert', @success OUT, @cert
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @crypt
        RETURN
      END

    -- Use SHA-256
    EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'sha256'

    -- Hash the utf-8 byte representation of the string
    EXEC sp_OASetProperty @crypt, 'Charset', 'utf-8'

    -- Return the result in base64
    EXEC sp_OASetProperty @crypt, 'EncodingMode', 'base64Mime'

    -- Sign some text to create a detached signature (i.e. a signature that does not include the signed data)
    DECLARE @textToSign nvarchar(4000)
    SELECT @textToSign = 'This is the text to be hashed and signed.'
    DECLARE @sigBase64 nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'SignStringENC', @sigBase64 OUT, @textToSign
    EXEC sp_OAGetProperty @crypt, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @crypt
        RETURN
      END


    PRINT @sigBase64

    -- The result:

    -- MIIWbgYJKoZIhvcNAQcCoIIWXzCCFlsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
    -- ghMXMIIFuzCCA6OgAwIBAgIIVwoRl0LE48wwDQYJKoZIhvcNAQELBQAwazELMAkGA1UEBhMCSVQx
    -- ...
    -- ...

    -- If we want it in PEM format with just LF line-endings:
    DECLARE @sb int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb OUT

    -- Just LF line endings, not CRLF.
    DECLARE @crlf int
    SELECT @crlf = 0
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, '-----BEGIN PKCS7-----', @crlf
    EXEC sp_OAMethod @sb, 'Append', @success OUT, @sigBase64
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, '-----END PKCS7-----', @crlf
    EXEC sp_OAMethod @sb, 'ToLF', @success OUT

    -- Save to a file.
    EXEC sp_OAMethod @sb, 'WriteFile', @success OUT, 'c:/temp/qa_output/sig.pem', 'utf-8', 0

    -- Examine..
    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- Result is:

    -- -----BEGIN PKCS7-----
    -- MIIWbgYJKoZIhvcNAQcCoIIWXzCCFlsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
    -- ghMXMIIFuzCCA6OgAwIBAgIIVwoRl0LE48wwDQYJKoZIhvcNAQELBQAwazELMAkGA1UEBhMCSVQx
    -- DjAMBgNVBAcMBU1pbGFuMSMwIQYDVQQKDBpBY3RhbGlzIFMucC5BLi8wMzM1ODUyMDk2NzEnMCUG
    -- A1UEAwweQWN0YWxpcyBBdXRoZW50aWNhdGlvbiBSb290IENBMB4XDTExMDkyMjExMjIwMloXDTMw
    -- MDkyMjExMjIwMlowazELMAkGA1UEBhMCSVQxDjAMBgNVBAcMBU1pbGFuMSMwIQYDVQQKDBpBY3Rh
    -- bGlzIFMucC5BLi8wMzM1ODUyMDk2NzEnMCUGA1UEAwweQWN0YWxpcyBBdXRoZW50aWNhdGlvbiBS
    -- b290IENBMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAp8bEpSmkLO/lGMWwUKNvUTuf
    -- ClrJwkg4CsIcoBh/kbWHuUA/3R1oHwiD1S0eiKD4j1aPbZkCkpAW1V8IbInX4ay8IMKx4INRimlN
    -- AJZaby/ARH6jDuSRzVju3PvHHkVH3Se5CAGfpiEd9UEtL0z9KK3giq0itFZljoZUj5NDKd45Rnij
    -- MCO6zfB9E1fAXdKDa0hMxKufgFpbOr3JpyI/gCczWw63igxdBzcIy2zSekciRDXFzMwujt0q7bd9
    -- ...
    -- ...
    -- -----END PKCS7-----

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


END
GO