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(SQL Server) Get a Certificate's Key Size

Demonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.)

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
    DECLARE @sTmp0 nvarchar(4000)
    -- For this example, I have a certificate in raw base64 format (not PEM),
    -- that looks like this:  "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA=="
    DECLARE @sbCertBase64 int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sbCertBase64 OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @sbCertBase64, 'LoadFile', @success OUT, 'qa_data/certs/base64Cert.txt', 'utf-8'

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

    EXEC sp_OAMethod @sbCertBase64, 'GetAsString', @sTmp0 OUT
    EXEC sp_OAMethod @cert, 'LoadFromBase64', @success OUT, @sTmp0
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbCertBase64
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    -- Get the public key.
    DECLARE @pubKey int
    EXEC sp_OAMethod @cert, 'ExportPublicKey', @pubKey OUT
    EXEC sp_OAGetProperty @cert, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbCertBase64
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    -- In Chilkat version v9.5.0.67, the KeySize property was added.
    DECLARE @numBits int
    EXEC sp_OAGetProperty @pubKey, 'KeySize', @numBits OUT

    PRINT 'Number of bits = ' + @numBits

    -- If using an older version of Chilkat, the key size can be obtained like this:
    DECLARE @xml int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Xml', @xml OUT

    EXEC sp_OAMethod @pubKey, 'GetXml', @sTmp0 OUT
    EXEC sp_OAMethod @xml, 'LoadXml', @success OUT, @sTmp0

    DECLARE @binDat int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.BinData', @binDat OUT

    EXEC sp_OAMethod @xml, 'GetChildContent', @sTmp0 OUT, 'Modulus'
    EXEC sp_OAMethod @binDat, 'AppendEncoded', @success OUT, @sTmp0, 'base64'

    EXEC sp_OAGetProperty @binDat, 'NumBytes', @iTmp0 OUT
    SELECT @numBits = 8 * @iTmp0

    PRINT 'Number of bits = ' + @numBits

    EXEC @hr = sp_OADestroy @pubKey


    EXEC @hr = sp_OADestroy @sbCertBase64
    EXEC @hr = sp_OADestroy @cert
    EXEC @hr = sp_OADestroy @xml
    EXEC @hr = sp_OADestroy @binDat


END
GO

 

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