(SQL Server) Write PKCS1 or PKCS8 Public Key PEM

Demonstrates how to write either PKCS1 or PKCS8 format PEM files. PKCS1 public keys have this PEM format:

-----BEGIN RSA PUBLIC KEY-----
BASE64 ENCODED DATA
-----END RSA PUBLIC KEY-----

-----BEGIN PUBLIC KEY-----
BASE64 ENCODED DATA
-----END PUBLIC KEY-----

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
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- Unlock the Chilkat API.
    -- Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
    -- by calling UnlockBundle.  It requires a Bundle unlock code.
    DECLARE @chilkatGlob int
    -- Use "Chilkat_9_5_0.Global" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Global', @chilkatGlob OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @chilkatGlob, 'UnlockBundle', @success OUT, 'Anything for 30-day trial.'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @chilkatGlob, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @chilkatGlob
        RETURN
      END

    DECLARE @pem int
    -- Use "Chilkat_9_5_0.Pem" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Pem', @pem OUT

    -- Load a public key from a PEM file.
    -- (Assume the PEM contains at least one public key..)
    EXEC sp_OAMethod @pem, 'LoadPemFile', @success OUT, '/Users/chilkat/testData/pem/myPublicKey.pem'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @pem, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @chilkatGlob
        EXEC @hr = sp_OADestroy @pem
        RETURN
      END

    DECLARE @i int

    DECLARE @numPublicKeys int
    EXEC sp_OAGetProperty @pem, 'NumPublicKeys', @numPublicKeys OUT
    IF @numPublicKeys = 0
      BEGIN

        PRINT ('Error: Expected the PEM to contain public keys.')
        EXEC @hr = sp_OADestroy @chilkatGlob
        EXEC @hr = sp_OADestroy @pem
        RETURN
      END

    -- Get each public key as PEM, first in PKCS1 format, then in PKCS8.
    SELECT @i = 1
    WHILE @i <= @numPublicKeys
      BEGIN

        -- First output to PKCS1 PEM format:

        PRINT 'This is PKCS1 format:'
        EXEC sp_OASetProperty @pem, 'PublicKeyFormat', 'pkcs1'
        EXEC sp_OAMethod @pem, 'ToPem', @sTmp0 OUT
        PRINT @sTmp0

        -- Now PKCS8 PEM format:

        PRINT 'This is PKCS8 format:'
        EXEC sp_OASetProperty @pem, 'PublicKeyFormat', 'pkcs8'
        EXEC sp_OAMethod @pem, 'ToPem', @sTmp0 OUT
        PRINT @sTmp0

        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @chilkatGlob
    EXEC @hr = sp_OADestroy @pem


END
GO