There's an example here: http://sourceforge.net/p/itext/code/HEAD/tree/tutorial/signatures/src/main/java/signatures/chapter4/C4_09_DeferredSigning.java
On 15/06/2013 21:48, Jonathan Vargas wrote:
/Procedure 1 by Application A:/ [FULL PDF] -> Extract Digest -> [DOC's DIGEST]
Well, ask Michael explained, you need to create a PDF that looks like it's signed but that isn't.
The signature will consist of <000000000...000>
/Procedure 2 by Application B:/ [DOC's DIGEST] -> Create Signature -> [DIGEST SIGNATURE]
This procedure could be called from an ExternalSignatureContainer implementation. It has a sign() method that receives the digest that needs to be signed as an InputStream.
/Procedure 3 by Application A:/ [DIGEST SIGNATURE] -> Apply Signature -> [FULL PDF]
That's done in the signDeferred() method.It takes the file created in Procedure 1, calls the sign() method mentioned in Procedure 2, and applies the signature.
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