PDFEncryptionDict

Vue de l’ensemble

‘PDFEncryptionDict’ est une classe dans Aspose.PDF FOSS pour Java.

Retire le dictionnaire /Encrypt du trailer PDF (ISO 32000-1:2008, §7.6.1, Tableaux 20-21).

Cette classe fournit 19 méthodes pour travailler avec les objets PDFEncryptionDict dans des programmes Java. Les méthodologies disponibles comprennent: ‘PDFEnCryptionsDic’, ‘build’, getCF', ‘getType’, 'getEncrymptMetadata', ’getFilter', ‚getKeyLength, ‘gettLongth’, ‘‘getO , 'geOE,, ‘GetP et 7 méthode supplémentaires. Tous les membres publics sont accessibles à toute application Java après l'installation de l’Aspose.PDF FOSS pour le package Java . Propriétés : 'cF ; ‘cipherTyp; 'encryptmetadata filtre, `key’ longueur, 11 et plus.

Propriétés

Name	Type	Access	Description
`filter`	`String`	Read	Filter name — must be “Standard” for standard handler.
`v`	`int`	Read	V: algorithm version (0-5).
`r`	`int`	Read	R: security handler revision (2-6).
`length`	`int`	Read	Key length in bits (40-256).
`keyLength`	`int`	Read	Key length in bytes.
`o`	`byte[]`	Read	O: owner password hash.
`u`	`byte[]`	Read	U: user password hash.
`oE`	`byte[]`	Read	OE: owner encryption key (R=6, 32 bytes).
`uE`	`byte[]`	Read	UE: user encryption key (R=6, 32 bytes).
`perms`	`byte[]`	Read	Perms: encrypted permissions (R=6, 16 bytes).
`p`	`int`	Read	P: permission flags as a signed 32-bit integer.
`encryptMetadata`	`boolean`	Read	EncryptMetadata: default true.
`stmF`	`String`	Read	StmF: crypt filter for streams (V=4+).
`strF`	`String`	Read	StrF: crypt filter for strings (V=4+).
`cF`	`PdfDictionary`	Read	CF: crypt filter dictionary (V=4+).
`cipherType`	`CipherType`	Read	Determines the cipher type based on V and crypt filters.
`pdfDictionary`	`PdfDictionary`	Read	Returns the underlying dictionary.

méthodes

Signature	Description
`PDFEncryptionDict(dict: PdfDictionary)`	Creates an encryption dictionary wrapper.
`getFilter()` → `String`	Filter name — must be “Standard” for standard handler.
`getV()` → `int`	V: algorithm version (0-5).
`getR()` → `int`	R: security handler revision (2-6).
`getLength()` → `int`	Key length in bits (40-256).
`getKeyLength()` → `int`	Key length in bytes.
`getO()` → `byte[]`	O: owner password hash.
`getU()` → `byte[]`	U: user password hash.
`getOE()` → `byte[]`	OE: owner encryption key (R=6, 32 bytes).
`getUE()` → `byte[]`	UE: user encryption key (R=6, 32 bytes).
`getPerms()` → `byte[]`	Perms: encrypted permissions (R=6, 16 bytes).
`getP()` → `int`	P: permission flags as a signed 32-bit integer.
`getEncryptMetadata()` → `boolean`	EncryptMetadata: default true.
`getStmF()` → `String`	StmF: crypt filter for streams (V=4+).
`getStrF()` → `String`	StrF: crypt filter for strings (V=4+).
`getCF()` → `PdfDictionary`	CF: crypt filter dictionary (V=4+).
`getCipherType()` → `CipherType`	Determines the cipher type based on V and crypt filters.
`build(algorithm: CryptoAlgorithm, permissions: int, O: byte[], U: byte[], OE: byte[], UE: byte[], Perms: byte[])` → `PDFEncryptionDict`	Builds a new /Encrypt dictionary for the given algorithm and parameters.
`getPdfDictionary()` → `PdfDictionary`	Returns the underlying dictionary.

Voir aussi

Aspose.PDF pour Java — API d’entreprise