SQL Server

Load an Encrypted Private Key from PEM Text

Demonstrates the Chilkat PrivateKey.LoadEncryptedPem method, which loads a private key from PEM text, using a password when the PEM is encrypted. The first argument is the PEM string and the second is the password. Unencrypted PEM is also accepted.

Background: An encrypted PEM protects the key material at rest — a stolen file is useless without the passphrase — which is why encrypted keys are preferred for anything shipped or stored. This loader supplies that passphrase to decrypt a BEGIN ENCRYPTED PRIVATE KEY block (and gracefully handles unencrypted PEM too), so it is a safe default when a PEM might be either. The password should come from a secure source, never a hard-coded literal.

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-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    --  Demonstrates the PrivateKey.LoadEncryptedPem method, which loads a private key from PEM text.
    --  The 1st argument is the PEM string and the 2nd is the password (used when the PEM is
    --  encrypted).  Unencrypted PEM is also accepted.

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

    --  The PEM text of an encrypted private key.
    DECLARE @pemText nvarchar(4000)
    SELECT @pemText = '-----BEGIN ENCRYPTED PRIVATE KEY-----' + CHAR(10) + 'MIIFHzBJ...' + CHAR(10) + '-----END ENCRYPTED PRIVATE KEY-----'

    --  The key password is not hard-coded in a real application; obtain it from an interactive
    --  prompt, environment variable, or a secrets vault.
    DECLARE @password nvarchar(4000)
    SELECT @password = 'myKeyPassword'

    EXEC sp_OAMethod @privKey, 'LoadEncryptedPem', @success OUT, @pemText, @password
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        RETURN
      END


    EXEC sp_OAGetProperty @privKey, 'KeyType', @sTmp0 OUT

    PRINT 'Loaded a ' + @sTmp0 + ' private key.'

    EXEC @hr = sp_OADestroy @privKey


END
GO