SQL Server

Duplicate openssl pkey -in private.pem -pubout -out pubkey.pem

See more OpenSSL Examples

How to output the public part of a private key: Demonstrates how to duplicate this OpenSSL command:

openssl pkey -in private.pem -pubout -out pubkey.pem

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

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

    -- Load the private key from an PEM file:
    EXEC sp_OAMethod @pkey, 'LoadPemFile', @success OUT, 'private.pem'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pkey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pkey
        RETURN
      END

    DECLARE @pubKey int
    EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT

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

    EXEC sp_OAMethod @pubKey, 'SavePemFile', @success OUT, 0, 'pubKey.pem'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @pubKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pubKey

        EXEC @hr = sp_OADestroy @pkey
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END


    PRINT 'Success.'

    EXEC @hr = sp_OADestroy @pkey
    EXEC @hr = sp_OADestroy @pubKey


END
GO