sign

Description:

public static MultipartSigned? sign (CryptoContext ctx, Object entity, string userid) throws Error

Attempts to sign the content MIME part with userid's private key using the ctx signing context.

If successful, a new multipart/signed object is returned.

Parameters:

ctx	a CryptoContext
entity	MIME part to sign
userid	user id to sign with

Returns:

a new MultipartSigned object on success or null on fail. If signing fails, an exception will be set on err to provide information as to why the failure occurred.