Criptografia e Seguranca

O PDF Oxide suporta criptografia de PDFs com senhas e permissões usando algoritmos padrão da indústria. Você pode definir uma senha de usuario (necessaria para abrir o documento), uma senha de proprietario (necessaria para acesso completo) e permissões granulares controlando impressao, copia e modificacao.

Início Rápido: Save with Criptografia

Python

from pdf_oxide import PdfDocument

doc = PdfDocument("input.pdf")
doc.set_title("Confidential Report")

# Encrypt with user and owner passwords
doc.save_encrypted("protected.pdf", "user123", "owner456")

WASM

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);
doc.setTitle("Confidential Report");

// Encrypt with user and owner passwords (all permissions enabled)
const output = doc.saveEncryptedToBytes(
  "user123", "owner456", true, true, true, true
);
doc.free();

Rust

use pdf_oxide::api::Pdf;

let mut doc = Pdf::open("input.pdf")?;

// Simple encryption with user and owner passwords
doc.save_encrypted("protected.pdf", "user123", "owner456")?;

Criptografia com Permissões Personalizadas

Python

O método save_encrypted aceita flags de permissão como argumentos nomeados.

from pdf_oxide import PdfDocument

doc = PdfDocument("input.pdf")

# View-only: no printing, copying, or modifying
doc.save_encrypted(
    "readonly.pdf",
    "viewpass",
    "adminpass",
    allow_print=False,
    allow_copy=False,
    allow_modify=False,
    allow_annotate=False,
)

# Allow only printing
doc.save_encrypted(
    "print-only.pdf",
    "",            # No open password required
    "adminpass",
    allow_print=True,
    allow_copy=False,
    allow_modify=False,
    allow_annotate=False,
)

Python save_encrypted Parametros

Parâmetro	Tipo	Padrão	Descrição
path	str	required	Output file path
user_password	str	required	Password to open (empty = no open password)
owner_password	str	None	Full-access password (defaults to user password)
allow_print	bool	True	Permitir impressão
allow_copy	bool	True	Permitir cópia text/graphics
allow_modify	bool	True	Allow modifying the document
allow_annotate	bool	True	Allow adding annotations

WASM

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);

// View-only: no printing, copying, or modifying
const readonly = doc.saveEncryptedToBytes(
  "viewpass", "adminpass", false, false, false, false
);

// Allow only printing (empty user password = no open password)
const printOnly = doc.saveEncryptedToBytes(
  "", "adminpass", true, false, false, false
);
doc.free();

Rust

Para complete control over encryption settings, use CriptografiaConfig and SaveOptions.

use pdf_oxide::api::Pdf;
use pdf_oxide::editor::{
    CriptografiaConfig, CriptografiaAlgorithm, Permissions, SaveOptions,
};

let mut doc = Pdf::open("input.pdf")?;

// Build permissions
let mut perms = Permissions::read_only();
perms.print = true;  // Permitir impressão only

// Build encryption config
let config = CriptografiaConfig::new("user123", "owner456")
    .with_algorithm(CriptografiaAlgorithm::Aes256)
    .with_permissions(perms);

// Save with encryption
doc.save_with_encryption("protected.pdf", config)?;

CriptografiaConfig

A struct CriptografiaConfig controla todos os parâmetros de criptografia.

use pdf_oxide::editor::{CriptografiaConfig, CriptografiaAlgorithm, Permissions};

let config = CriptografiaConfig {
    user_password: "user123".to_string(),
    owner_password: "owner456".to_string(),
    algorithm: CriptografiaAlgorithm::Aes256,
    permissions: Permissions::all(),
};

Or use the builder pattern:

let config = CriptografiaConfig::new("user123", "owner456")
    .with_algorithm(CriptografiaAlgorithm::Aes128)
    .with_permissions(Permissions::read_only());

CriptografiaConfig Fields

Campo	Tipo	Descrição
user_password	String	Password required to open the document
owner_password	String	Password for full access and changing security
algorithm	CriptografiaAlgorithm	Criptografia algorithm to use
permissions	Permissions	Access control flags

Criptografia Algorithms

Algorithm	Descrição
CriptografiaAlgorithm::Aes256	AES-256 (strongest, recommended)
CriptografiaAlgorithm::Aes128	AES-128
CriptografiaAlgorithm::Rc4_128	RC4 128-bit (legacy compatibility)
CriptografiaAlgorithm::Rc4_40	RC4 40-bit (legacy, weak)

AES-256 is the default when using save_encrypted() in Python or the Pdf API.

Permissions

A struct Permissions controla quais operações são permitidas quando um documento é aberto com a senha de usuário.

use pdf_oxide::editor::Permissions;

// Allow everything
let all = Permissions::all();

// Restrict everything
let readonly = Permissions::read_only();

Permissions Fields

Field	Type	Padrão (all)	Padrão (read_only)	Descrição
print	bool	true	false	Permitir impressão
print_high_quality	bool	true	false	Allow high-quality printing
modify	bool	true	false	Allow modifying content
copy	bool	true	false	Permitir cópia text/graphics
annotate	bool	true	false	Allow adding annotations
fill_forms	bool	true	false	Allow filling form fields
accessibility	bool	true	true	Allow accessibility extraction
assemble	bool	true	false	Allow página assembly operations

Custom Permissions

let mut perms = Permissions::read_only();
perms.print = true;          // Permitir impressão
perms.fill_forms = true;     // Allow filling forms
perms.accessibility = true;  // Always allow for compliance

SaveOptions

Use SaveOptions for full control over how the document is written.

use pdf_oxide::editor::{SaveOptions, CriptografiaConfig};

// Full rewrite (default)
let opts = SaveOptions::full_rewrite();

// Incremental update (faster, preserves structure)
let opts = SaveOptions::incremental();

// With encryption
let config = CriptografiaConfig::new("user", "owner");
let opts = SaveOptions::with_encryption(config);

Abrindo PDFs Criptografados

Python

Pass the password when opening the document.

from pdf_oxide import PdfDocument

doc = PdfDocument("protected.pdf", password="user123")
text = doc.extract_text(0)
print(text)

Rust

use pdf_oxide::PdfDocument;

let doc = PdfDocument::open_with_password("protected.pdf", "user123")?;
let text = doc.extract_text(0)?;
println!("{}", text);

Complete Criptografia Workflow

Python

from pdf_oxide import PdfDocument

# Open and modify
doc = PdfDocument("report.pdf")
doc.set_title("Confidential Report")
doc.set_author("Finance Team")

# Save with view-only restrictions
doc.save_encrypted(
    "report-protected.pdf",
    "",            # No password to open
    "admin2025",   # Senha do proprietário for full access
    allow_print=True,
    allow_copy=False,
    allow_modify=False,
)

WASM

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);
doc.setTitle("Confidential Report");
doc.setAuthor("Finance Team");

// Save with view-only restrictions (no open password, print allowed)
const output = doc.saveEncryptedToBytes(
  "", "admin2025", true, false, false, false
);
doc.free();

Rust

use pdf_oxide::api::Pdf;
use pdf_oxide::editor::{
    DocumentEditor, EditableDocument,
    CriptografiaConfig, CriptografiaAlgorithm, Permissions, SaveOptions,
};

// Open and modify
let mut doc = Pdf::open("report.pdf")?;
{
    let editor = doc.editor().unwrap();
    editor.set_title("Confidential Report");
    editor.set_author("Finance Team");
}

// Configure encryption
let permissions = Permissions {
    print: true,
    print_high_quality: true,
    modify: false,
    copy: false,
    annotate: false,
    fill_forms: true,
    accessibility: true,
    assemble: false,
};

let config = CriptografiaConfig::new("", "admin2025")
    .with_algorithm(CriptografiaAlgorithm::Aes256)
    .with_permissions(permissions);

doc.save_with_encryption("report-protected.pdf", config)?;

Re-encrypt with Different Settings

Rust

use pdf_oxide::editor::{DocumentEditor, EditableDocument, CriptografiaConfig, SaveOptions};

// Open with current password
let mut editor = DocumentEditor::open("old-protected.pdf")?;

// Save with new encryption
let config = CriptografiaConfig::new("newuser", "newowner");
let options = SaveOptions::with_encryption(config);
editor.save_with_options("re-encrypted.pdf", options)?;

Referência Completa da API

Pdf Methods

Method	Retorna	Descrição
save_encrypted(path, user_pw, owner_pw)	Result<()>	Save with AES-256 and full permissions
save_with_encryption(path, config)	Result<()>	Save with custom encryption config

DocumentEditor / EditableDocument Methods

Method	Retorna	Descrição
save(path)	Result<()>	Save with full rewrite (no encryption)
save_with_options(path, options)	Result<()>	Save with custom options

Configuração Types

Type	Descrição
CriptografiaConfig	User/owner passwords, algorithm, permissions
CriptografiaAlgorithm	Aes256, Aes128, Rc4_128, Rc4_40
Permissions	Fine-grained access control flags
SaveOptions	Full rewrite, incremental, or encrypted save

Páginas Relacionadas

• Editing Overview – opening, metadata, and save workflow
• Form Field Editing – restrict form editing with permissions
• Redaction – redact content before encrypting
• Page Operations – prepare pages before final encryption