SQL Server

RSA Signature SHA256withRSA, iso-8859-1, base64

See more RSA Examples

RSA sign the iso-8859-1 byte representation of a string with SHA256withRSA, and return the signature in the base64 encoding. 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.

    -- This example will duplicate the following Java code:
    -- 
    -- Signature sign = Signature.getInstance("SHA256withRSA");
    -- sign.initSign(privateKey);
    -- sign.update(original.getBytes(Charset.forName("ISO-8859-1")));
    -- 
    -- ...
    -- byte[] resultado = sign.sign();
    -- sello = encodeByteArrayToBase64(resultado);
    -- 

    -- Load an RSA private key for signing.
    -- You can load any format file.  This example loads a .pem, but you can provide path to any type of file holding a private key.
    DECLARE @privKey int
    EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @privKey OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OAMethod @privKey, 'LoadAnyFormatFile', @success OUT, 'qa_data/pem/rsa_passwd.pem', 'passwd'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        RETURN
      END

    DECLARE @rsa int
    EXEC @hr = sp_OACreate 'Chilkat.Rsa', @rsa OUT

    EXEC sp_OAMethod @rsa, 'UsePrivateKey', @success OUT, @privKey

    DECLARE @originalData nvarchar(4000)
    SELECT @originalData = 'This is the string to be hashed an RSA signed.'

    -- Indicate that we want the iso-8859-1 byte representation of the string to be signed
    EXEC sp_OASetProperty @rsa, 'Charset', 'iso-8859-1'

    -- We want the RSA signature in base64 format
    EXEC sp_OASetProperty @rsa, 'EncodingMode', 'base64'

    DECLARE @sigBase64 nvarchar(4000)
    EXEC sp_OAMethod @rsa, 'SignStringENC', @sigBase64 OUT, @originalData, 'sha256'

    PRINT @sigBase64

    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @rsa


END
GO