SQL Server

Generate an ECC Key (Public and Private)

See more ECC Examples

Demonstrates how to generate an ECC key and save both public and private parts. 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.

    -- Create a Fortuna PRNG and seed it with system entropy.
    -- This will be our source of random data for generating the ECC private key.
    DECLARE @fortuna int
    EXEC @hr = sp_OACreate 'Chilkat.Prng', @fortuna OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @entropy nvarchar(4000)
    EXEC sp_OAMethod @fortuna, 'GetEntropy', @entropy OUT, 32, 'base64'
    EXEC sp_OAMethod @fortuna, 'AddEntropy', @success OUT, @entropy, 'base64'

    DECLARE @ecc int
    EXEC @hr = sp_OACreate 'Chilkat.Ecc', @ecc OUT

    -- Generate a random ECC private key on the secp256r1 curve.
    -- Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256k1.

    DECLARE @privKey int
    EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @privKey OUT

    EXEC sp_OAMethod @ecc, 'GenKey', @success OUT, 'secp256r1', @fortuna, @privKey
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @ecc, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @fortuna
        EXEC @hr = sp_OADestroy @ecc
        EXEC @hr = sp_OADestroy @privKey
        RETURN
      END

    -- Save the private key to PKCS8 encrypted PEM
    -- (The private key can be saved in a variety of different formats. See the online reference documentation.)
    EXEC sp_OAMethod @privKey, 'SavePkcs8EncryptedPemFile', @success OUT, 'pemPassword', 'qa_output/eccPrivKey.pem'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
      END

    -- The private key PEM looks like this:

    -- 	-----BEGIN ENCRYPTED PRIVATE KEY-----
    -- 	MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAhUmn+1/lwCIwICCAAw
    -- 	FAYIKoZIhvcNAwcECPlyNXAXZO+oBIGAIvxvTENXJWbrCwSjh0QNxLecBotUpfI5
    -- 	auOonLmwVMyt1ahMmNyVo/D+pnKQSE41Fg8fApM0DCDKZUOVCCcK1qirIsMPQkGp
    -- 	klPJbvrQRVYgzBtU31uNB5y2wqhrIeepal1HXBvbkUK0nfJMbcdz/XAEIQu2HhTD
    -- 	t6LMScPQld4=
    -- 	-----END ENCRYPTED PRIVATE KEY-----

    -- Now get the public key part from the private key.
    -- (A public key is actually a subset of the private key.)
    DECLARE @pubKey int
    EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT

    EXEC sp_OAMethod @privKey, 'ToPublicKey', @success OUT, @pubKey

    -- Save the public key to a PEM file.
    -- (The public key can be saved in a variety of different formats. See the online reference documentation.)
    -- For ECC keys, the 1st argument (bPreferPkcs1) is ignored and unused.
    DECLARE @bPreferPkcs1 int
    SELECT @bPreferPkcs1 = 0
    EXEC sp_OAMethod @pubKey, 'SavePemFile', @success OUT, @bPreferPkcs1, 'qa_output/eccPubKey.pem'

    -- The public key PEM looks like this:

    -- 	-----BEGIN PUBLIC KEY-----
    -- 	MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA
    -- 	AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA////
    -- 	///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd
    -- 	NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5
    -- 	RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA
    -- 	//////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABGdOH8uM6SfX3mdV+TR0mWp2
    -- 	gfVRPlxWxwhOiowuNByBxmQz7ZR4CJY1XcN2zkUo5pzW73ZhGwgd2XTOvqPqG40=
    -- 	-----END PUBLIC KEY-----
    -- 


    PRINT 'finished.'

    EXEC @hr = sp_OADestroy @fortuna
    EXEC @hr = sp_OADestroy @ecc
    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @pubKey


END
GO