How to read/extract signature details field from a signed PDF using java -

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as i'm working on initiative project verifies whether document produced customer tampered or not? objectives follows:
1.to check data integrity of content provided in signed pdf ? 2.to validate whether signature tampered or not? 3.also verifying whether series of ca valid ensuring revocation list

i've gone through e-sign api document, basics of pdf,basics of x.509 certificate, openssl tool (which helped viewing x.509 certificate , not #pkcs7 standard format) can please let me know how can extract/read signature dictionary signed pdf using java? other tool achieve objective okay since i'm using java language code, preferable in java. in advance!


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