SQL Server

DSA Generate Key

See more DSA Examples

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

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

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

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

    -- Call GenKey to generate a new DSA key.
    -- The number of bits should be at least 1024 and a multiple
    -- of 64.   Typical values are either 1024 or 2048.
    -- DSA key generation is compute intensive and may take
    -- a short while to complete.
    EXEC sp_OAMethod @dsa, 'GenKey', @success OUT, 2048
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @dsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @dsa
        RETURN
      END

    -- Extract the private and public parts to PEM or DER format
    -- and save to files...
    DECLARE @pemStr nvarchar(4000)

    DECLARE @xmlStr nvarchar(4000)

    -- First for the public key...
    -- The public key never needs to be encrypted.

    -- Save the public key in PEM format:
    EXEC sp_OAMethod @dsa, 'ToPublicPem', @pemStr OUT
    -- This example will not check the return value of SaveText...
    EXEC sp_OAMethod @dsa, 'SaveText', @success OUT, @pemStr, 'dsa_pub.pem'

    -- Save the public key in DER format:
    EXEC sp_OAMethod @dsa, 'ToPublicDerFile', @success OUT, 'dsa_pub.der'

    DECLARE @bPublicOnly int
    SELECT @bPublicOnly = 1
    -- Save to XML
    EXEC sp_OAMethod @dsa, 'ToXml', @xmlStr OUT, @bPublicOnly
    EXEC sp_OAMethod @dsa, 'SaveText', @success OUT, @xmlStr, 'dsa_pub.xml'

    -- ------------------------------------
    -- Now for the private key....
    -- ------------------------------------

    -- Unencrypted PEM:
    EXEC sp_OAMethod @dsa, 'ToPem', @pemStr OUT
    EXEC sp_OAMethod @dsa, 'SaveText', @success OUT, @pemStr, 'dsa_priv.pem'

    -- Encrypted PEM:
    EXEC sp_OAMethod @dsa, 'ToEncryptedPem', @pemStr OUT, 'myPassword'
    EXEC sp_OAMethod @dsa, 'SaveText', @success OUT, @pemStr, 'dsa_privEncrypted.pem'

    -- DER:
    EXEC sp_OAMethod @dsa, 'ToDerFile', @success OUT, 'dsa_priv.der'

    -- XML:
    SELECT @bPublicOnly = 0
    EXEC sp_OAMethod @dsa, 'ToXml', @xmlStr OUT, @bPublicOnly
    EXEC sp_OAMethod @dsa, 'SaveText', @success OUT, @xmlStr, 'dsa_priv.xml'


    PRINT 'Finished!'

    EXEC @hr = sp_OADestroy @dsa


END
GO