Complete digital signature signing + verification (7/7 pass) - #17
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Signing: - Create signature dict with ByteRange and Contents placeholder - Insert Contents hex string directly into serialized PDF bytes - Compute ByteRange with size-adjustment for variable-length values - Create OpenSSL PKCS#7 detached signature over signed byte range - Inject hex-encoded signature into Contents placeholder Verification: - Parse signed PDF bytes for /ByteRange and /Contents - Extract signed data using ByteRange offsets - Parse PKCS#7 DER from hex-encoded Contents - Verify signature against trusted certificates via OpenSSL - Return Result structs with signer, valid?, cert_chain - Return empty array for unsigned documents
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Full PKCS#7 detached signing with ByteRange computation