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(SQL Server) Create and Verify an Opaque PKCS7/CMS Signature

Demonstrates how to create a PKCS7 opaque signature, and also how to verify an opaque signature. An opaque signature is different than a detached PKCS7 signature in that it contains the original data. Verifying an opaque signature retrieves the original content.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    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
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Crypt2', @crypt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  A certificate and private key is needed to create a signature.
    --  Chilkat provides many different ways to load a certificate and private key, such
    --  as from a PFX/.p12, Java keystore, JWK, Windows registry-based certificate stores, and other sources.
    --  This example will load the certificate from a .crt and the private key from a .key file

    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Cert', @cert OUT

    --  The LoadFromFile method will automatically detect the format and load it.
    DECLARE @success int
    EXEC sp_OAMethod @cert, 'LoadFromFile', @success OUT, 'qa_data/certs/test_12345678a.cer'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    --  Our private key is in an encrypted PKCS8 format.
    --  If you don't know the format of your key, but you do know it's encrypted,
    --  and requires a password, then just call any of the Chilkat methods that load
    --  a private key w/ a password argument.  Chilkat will auto-detect the format
    --  and load it correctly even if it's not the format indicated by the method name..
    DECLARE @privKey int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.PrivateKey', @privKey OUT

    DECLARE @password nvarchar(4000)
    SELECT @password = '12345678a'
    EXEC sp_OAMethod @privKey, 'LoadPkcs8EncryptedFile', @success OUT, 'qa_data/certs/test_12345678a.key', @password
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @privKey
        RETURN
      END

    --  Set properties required for signing.

    --  Tell it to use the cert and private key we've loaded.
    EXEC sp_OAMethod @crypt, 'SetSigningCert2', @success OUT, @cert, @privKey
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @privKey
        RETURN
      END

    --  Indicate we want the opaque signature in base64 format:
    EXEC sp_OASetProperty @crypt, 'EncodingMode', 'base64'

    --  Sign the string using the "utf-8" byte representation:
    EXEC sp_OASetProperty @crypt, 'Charset', 'utf-8'

    --  Create the opaque signature:
    DECLARE @originalData nvarchar(4000)
    SELECT @originalData = 'This is the string to be signed.'
    DECLARE @opaqueSig nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'OpaqueSignStringENC', @opaqueSig OUT, @originalData


    PRINT @opaqueSig

    --  The output looks like this:
    --  MIIPgQYJKoZIhvcNAQcCoIIPcjCCD24CAQExCzAJBgUrDgMCGgUAMC8GCSqGSIb3DQEHAaAiBCBUaGlzIGlzIHRoZSBzdHJpbmcgdG8gYmUgc...

    --  ----------------------------------------------------------------------------------------------
    --  Now let's verify the signature and retrieve the original data.
    --  We'll use a new Crypt2 object to keep things completely separate...

    DECLARE @vCrypt int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Crypt2', @vCrypt OUT

    --  We only need the certificate to verify a signature (and extract the data from
    --  an opaque signature).  The public key is always embedded within a certificate.
    EXEC sp_OAMethod @vCrypt, 'SetVerifyCert', @success OUT, @cert
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @vCrypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @vCrypt
        RETURN
      END

    EXEC sp_OASetProperty @vCrypt, 'EncodingMode', 'base64'
    EXEC sp_OASetProperty @vCrypt, 'Charset', 'utf-8'

    DECLARE @extractedData nvarchar(4000)
    EXEC sp_OAMethod @vCrypt, 'OpaqueVerifyStringENC', @extractedData OUT, @opaqueSig
    EXEC sp_OAGetProperty @vCrypt, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @vCrypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @vCrypt
        RETURN
      END


    PRINT 'The extracted data: ' + @extractedData

    --  The output is:
    --  The extracted data: This is the string to be signed.

    EXEC @hr = sp_OADestroy @crypt
    EXEC @hr = sp_OADestroy @cert
    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @vCrypt


END
GO

 

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