THotPDF.ValidatePDFMAC Method

校验独立的或随签名附带的 PDF MAC 数据，并返回结构化的失败诊断

声明

function ValidatePDFMAC(const FileName: TFileName; const Password: AnsiString; out ValidationInfo: THPDFPDFMACValidationInfo): boolean; overload;
function ValidatePDFMAC(const FileName: TFileName; const Password: AnsiString; const Options: THPDFPDFMACOptions; out ValidationInfo: THPDFPDFMACValidationInfo): boolean; overload;

使用说明

• THPDFPDFMACStatus distinguishes authentication, modification, truncation, malformed-data, and unsupported-algorithm failures
• THPDFPDFMACValidationInfo reports coverage, algorithm, digest, and authentication decisions
• THPDFPDFMACLocation distinguishes standalone, signature-attached, and unknown locations
• No decrypted plaintext is exposed before authentication succeeds
• pmsPolicyRejected 表示摘要或加密模式解析有效，但不被策略允许
• 结果会报告检测到的摘要、选中的 profile、策略决定以及 AES-256-GCM 的使用情况
• PermissionsAuthenticated confirms that encrypted /Perms matches /P，而 MACRequiredByPermissions reports the authenticated PDF MAC requirement bit
• Attached validation resolves the active trailer SigObjRef, requires exactly one matching signature field, and verifies complete signature ByteRange coverage
• Location, SignatureObjectNumber, SignatureGeneration, FullFileCoverage，以及 SignatureDigestMatched report the verified attachment binding
• pmsSignatureBindingFailed 用来区分原始签名值摘要校验失败与文档被修改这两种情况

要认证每一个增量修订版本，请参阅 ValidatePDFMACChain；profile 的语义请参阅 PDF MAC Algorithm Agility and Policy Profiles