(SQL Server) RSA Encrypt with Modulus and Exponent

Demonstrates how to RSA encrypt with a given modulus and exponent.

Note: This example requires Chilkat v11.0.0 or greater.

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)
    DECLARE @success int
    SELECT @success = 0

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

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

    -- Assuming you already have a base64 modulus and exponent,
    -- wrap it in XML like this:
    DECLARE @modulus nvarchar(4000)
    SELECT @modulus = 'qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM='
    DECLARE @exponent nvarchar(4000)
    SELECT @exponent = 'AQAB'

    DECLARE @xml int
    EXEC @hr = sp_OACreate 'Chilkat.Xml', @xml OUT

    EXEC sp_OASetProperty @xml, 'Tag', 'RSAPublicKey'
    EXEC sp_OAMethod @xml, 'NewChild2', NULL, 'Modulus', @modulus
    EXEC sp_OAMethod @xml, 'NewChild2', NULL, 'Exponent', @exponent

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

    EXEC sp_OAMethod @pubKey, 'LoadFromString', @success OUT, @xml
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pubKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rsa
        EXEC @hr = sp_OADestroy @xml
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    EXEC sp_OAMethod @rsa, 'UsePublicKey', @success OUT, @pubKey
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rsa
        EXEC @hr = sp_OADestroy @xml
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    DECLARE @usePrivateKey int
    SELECT @usePrivateKey = 0
    DECLARE @plainText nvarchar(4000)
    SELECT @plainText = 'message in a bottle'

    EXEC sp_OASetProperty @rsa, 'EncodingMode', 'base64'
    DECLARE @encryptedStrBase64 nvarchar(4000)
    EXEC sp_OAMethod @rsa, 'EncryptStringENC', @encryptedStrBase64 OUT, @plainText, @usePrivateKey

    PRINT @encryptedStrBase64

    EXEC @hr = sp_OADestroy @rsa
    EXEC @hr = sp_OADestroy @xml
    EXEC @hr = sp_OADestroy @pubKey


END
GO