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Steps involved in Adding Digital Signature to a PDF File:

(I) Create Template PDFDocument :

Create PDFDocument with template signature:
PDSignature pdSignature,
pdSignature.setByteRange(new int[]<0, 0, 0, 0>);
pdSignature.setContents(new byte[n*1024]);

where n is an integer, ie multiple of kbs.

Note: Content Size should be greater than or equal to sum of length of Signature and Certificate File.

(II) Update the Template PDF Docuement :

(a) Update /ByteRange[a b c d]:
(i) a= Offset of % in "%PDF"(=0, by default)
(ii) b= Offset of < in "/Contents<000. 000>"
(iii) c= Offset of > in "/Contents<000. 000>"
(iv) d= Offset of F in "%%EOF"-c

(b) update xref section:
update the cross-reference table(xref section), that specifies the position of the objects and

(c) Update startxref section:
update startxref, which is the offset of start of cross-reference table(xref).

(III) Generate Digital Signature of the Updated Template Document:
Generate of the Updated Template Document Excluding the Temporary Signed Data ("000. 000) of "/Contents<000. 000>"

(IV) Update Content<> Section:
Substitute First/Initial "0"s of Signed Data length in "/Contents<000. 000>" with Signed Data (Enveloped) of template PDFFile.

Use SignatureInterface of PDFBox :

(a) implement SignatureInterface to call sign() method (b) supply the input, output files, keystore, alias, pin (c) do save incrment

(or) use any java pdf library (like iText. )

(or) Implement the Steps I-IV in java yourself.