加密与安全

PDF Oxide 支持使用行业标准算法通过密码和权限对 PDF 进行加密。你可以设置用户密码（打开文档所需）、所有者密码（获得完整访问权限所需），以及控制打印、复制和修改的精细权限。

绑定覆盖范围。 打开加密 PDF 的功能适用于所有绑定（Python 中为 password=，Rust 中为 PdfDocument.open_with_password，WASM 中为 authenticate()，Go/C# 的 PdfDocument 中为 Authenticate，C# 中为 OpenWithPassword）。生成加密输出（save_encrypted / saveEncryptedToBytes）在 Python、Rust、WASM 和 Go（DocumentEditor.SaveEncrypted）中可用。C# 的 DocumentEditor 目前未公开 SaveEncrypted——如需在 C# 工作流中生成加密输出，请使用 Rust CLI（pdf-oxide encrypt）或 Go/Python 步骤。

算法支持

算法	读取	写入	备注
RC4 (40/128 位)	是	是	传统算法；仅用于兼容性
AES-128 (V=4, R=4)	是	是	PDF 1.6+ 默认算法
AES-256 (V=5, R=6)	是	是	PDF 2.0；包含非压缩对象字符串解密、按钮小部件 /MK /CA 标题，以及正确的 Algorithm 2.B 终止处理

AES-256 提供完整的端到端覆盖：打开、认证、读取表单值以及保存加密输出，全程无缝衔接。ObjStm / XRef 流按照 ISO 32000-2 §7.6.3 规定不加密。延迟调用 authenticate() 后，对象缓存会正确失效，因此在认证前读取的任何内容都会用正确的密钥重新解析。

快速入门：加密保存

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")?;

Go

package main

import (
    "log"
    pdfoxide "github.com/yfedoseev/pdf_oxide/go"
)

func main() {
    editor, err := pdfoxide.OpenEditor("input.pdf")
    if err != nil { log.Fatal(err) }
    defer editor.Close()

    _ = editor.SetTitle("Confidential Report")

    // Encrypt with user and owner passwords (AES-256)
    if err := editor.SaveEncrypted("protected.pdf", "user123", "owner456"); err != nil {
        log.Fatal(err)
    }
}

C++

#include <pdf_oxide/pdf_oxide.hpp>

auto editor = pdf_oxide::DocumentEditor::open("input.pdf");

// Encrypt with user and owner passwords (AES-256)
editor.save_encrypted("protected.pdf", "user123", "owner456");

Swift

import PdfOxide

let editor = try DocumentEditor.openEditor("input.pdf")

// Encrypt with user and owner passwords (AES-256)
try editor.saveEncrypted("protected.pdf", userPassword: "user123", ownerPassword: "owner456")

Dart

import 'package:pdf_oxide/pdf_oxide.dart';

final editor = DocumentEditor.open('input.pdf');

// Encrypt with user and owner passwords (AES-256)
editor.saveEncrypted('protected.pdf', 'user123', 'owner456');
editor.close();

R

library(pdfoxide)

editor <- pdf_editor_open("input.pdf")

# Encrypt with user and owner passwords (AES-256)
pdf_editor_save_encrypted(editor, "protected.pdf", "user123", "owner456")

Julia

using PdfOxide

editor = open_editor("input.pdf")

# Encrypt with user and owner passwords (AES-256)
save_encrypted(editor, "protected.pdf", "user123", "owner456")

Zig

const pdf_oxide = @import("pdf_oxide");

var editor = try pdf_oxide.DocumentEditor.openEditor("input.pdf");
defer editor.deinit();

// Encrypt with user and owner passwords (AES-256)
try editor.saveEncrypted("protected.pdf", "user123", "owner456");

Objective-C

#import "POXPdfOxide.h"
NSError *err = nil;

POXDocumentEditor *editor = [POXDocumentEditor openEditor:@"input.pdf" error:&err];

// Encrypt with user and owner passwords (AES-256)
[editor saveEncryptedToPath:@"protected.pdf"
               userPassword:@"user123"
              ownerPassword:@"owner456"
                      error:&err];

Elixir

{:ok, editor} = PdfOxide.open_editor("input.pdf")

# Encrypt with user and owner passwords (AES-256)
:ok = PdfOxide.editor_save_encrypted(editor, "protected.pdf", "user123", "owner456")

自定义权限加密

Python

save_encrypted 方法以关键字参数的形式接受权限标志。

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 参数说明

参数	类型	默认值	说明
path	str	必填	输出文件路径
user_password	str	必填	打开文档所需密码（空字符串表示无需密码）
owner_password	str	None	完整访问密码（默认与用户密码相同）
allow_print	bool	True	允许打印
allow_copy	bool	True	允许复制文本/图形
allow_modify	bool	True	允许修改文档
allow_annotate	bool	True	允许添加注释

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

如需完全控制加密设置，请使用 EncryptionConfig 和 SaveOptions。

use pdf_oxide::api::Pdf;
use pdf_oxide::editor::{
    EncryptionConfig, EncryptionAlgorithm, Permissions, SaveOptions,
};

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

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

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

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

EncryptionConfig

EncryptionConfig 结构体控制所有加密参数。

use pdf_oxide::editor::{EncryptionConfig, EncryptionAlgorithm, Permissions};

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

也可以使用构建者模式：

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

EncryptionConfig 字段

字段	类型	说明
user_password	String	打开文档所需的密码
owner_password	String	完整访问和修改安全设置所需的密码
algorithm	EncryptionAlgorithm	所使用的加密算法
permissions	Permissions	访问控制标志

加密算法

算法	说明
EncryptionAlgorithm::Aes256	AES-256（最强，推荐）
EncryptionAlgorithm::Aes128	AES-128
EncryptionAlgorithm::Rc4_128	RC4 128 位（传统兼容）
EncryptionAlgorithm::Rc4_40	RC4 40 位（传统，弱加密）

在 Python 中使用 save_encrypted() 或 Pdf API 时，默认使用 AES-256。

权限（Permissions）

Permissions 结构体控制使用用户密码打开文档时允许的操作。

use pdf_oxide::editor::Permissions;

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

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

Permissions 字段

字段	类型	默认值 (all)	默认值 (read_only)	说明
print	bool	true	false	允许打印
print_high_quality	bool	true	false	允许高质量打印
modify	bool	true	false	允许修改内容
copy	bool	true	false	允许复制文本/图形
annotate	bool	true	false	允许添加注释
fill_forms	bool	true	false	允许填写表单字段
accessibility	bool	true	true	允许无障碍功能提取
assemble	bool	true	false	允许页面组装操作

自定义权限

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

SaveOptions

使用 SaveOptions 可完全控制文档的写入方式。

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

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

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

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

打开加密 PDF

Python

打开文档时传入密码。

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);

Go

doc, _ := pdfoxide.Open("protected.pdf")
defer doc.Close()
if _, err := doc.Authenticate("user123"); err != nil { log.Fatal(err) }
text, _ := doc.ExtractText(0)
fmt.Println(text)

C#

using var doc = PdfDocument.OpenWithPassword("protected.pdf", "user123");
Console.WriteLine(doc.ExtractText(0));

C++

#include <pdf_oxide/pdf_oxide.hpp>
#include <iostream>

auto doc = pdf_oxide::Document::open_with_password("protected.pdf", "user123");
std::cout << doc.extract_text(0) << std::endl;

Swift

import PdfOxide

let doc = try Document.openWithPassword("protected.pdf", password: "user123")
print(try doc.extractText(0))

Dart

import 'package:pdf_oxide/pdf_oxide.dart';

final doc = PdfDocument.openWithPassword('protected.pdf', 'user123');
print(doc.extractText(0));
doc.close();

R

library(pdfoxide)

doc <- pdf_open_with_password("protected.pdf", "user123")
cat(pdf_extract_text(doc, 0))

Julia

using PdfOxide

doc = open_with_password("protected.pdf", "user123")
println(extract_text(doc, 0))

Zig

const std = @import("std");
const pdf_oxide = @import("pdf_oxide");
const a = std.heap.page_allocator;

var doc = try pdf_oxide.Document.openWithPassword("protected.pdf", "user123");
defer doc.deinit();
const text = try doc.extractText(a, 0);
std.debug.print("{s}\n", .{text});

Objective-C

#import "POXPdfOxide.h"
NSError *err = nil;

POXDocument *doc = [POXDocument openWithPassword:@"protected.pdf" password:@"user123" error:&err];
NSLog(@"%@", [doc extractText:0 error:&err]);

Elixir

{:ok, doc} = PdfOxide.open_with_password("protected.pdf", "user123")
{:ok, text} = PdfOxide.extract_text(doc, 0)
IO.puts(text)

完整加密工作流

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",   # Owner password 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,
    EncryptionConfig, EncryptionAlgorithm, 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 = EncryptionConfig::new("", "admin2025")
    .with_algorithm(EncryptionAlgorithm::Aes256)
    .with_permissions(permissions);

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

下方的全接口绑定以 AES-256 加密和完整权限保存输出，不支持 Python/WASM/Rust 中提供的逐标志权限控制。保存前请通过编辑器的 set_producer 设置 /Info 元数据。

C++

#include <pdf_oxide/pdf_oxide.hpp>

auto editor = pdf_oxide::DocumentEditor::open("report.pdf");
editor.set_producer("Finance Team");

// Save with AES-256 encryption (no open password, owner password for full access)
editor.save_encrypted("report-protected.pdf", "", "admin2025");

Swift

import PdfOxide

let editor = try DocumentEditor.openEditor("report.pdf")
try editor.setProducer("Finance Team")

// Save with AES-256 encryption (no open password, owner password for full access)
try editor.saveEncrypted("report-protected.pdf", userPassword: "", ownerPassword: "admin2025")

Dart

import 'package:pdf_oxide/pdf_oxide.dart';

final editor = DocumentEditor.open('report.pdf');
editor.setProducer('Finance Team');

// Save with AES-256 encryption (no open password, owner password for full access)
editor.saveEncrypted('report-protected.pdf', '', 'admin2025');
editor.close();

R

library(pdfoxide)

editor <- pdf_editor_open("report.pdf")
pdf_editor_set_producer(editor, "Finance Team")

# Save with AES-256 encryption (no open password, owner password for full access)
pdf_editor_save_encrypted(editor, "report-protected.pdf", "", "admin2025")

Julia

using PdfOxide

editor = open_editor("report.pdf")
set_producer(editor, "Finance Team")

# Save with AES-256 encryption (no open password, owner password for full access)
save_encrypted(editor, "report-protected.pdf", "", "admin2025")

Zig

const pdf_oxide = @import("pdf_oxide");

var editor = try pdf_oxide.DocumentEditor.openEditor("report.pdf");
defer editor.deinit();
try editor.setProducer("Finance Team");

// Save with AES-256 encryption (no open password, owner password for full access)
try editor.saveEncrypted("report-protected.pdf", "", "admin2025");

Objective-C

#import "POXPdfOxide.h"
NSError *err = nil;

POXDocumentEditor *editor = [POXDocumentEditor openEditor:@"report.pdf" error:&err];
[editor setProducer:@"Finance Team" error:&err];

// Save with AES-256 encryption (no open password, owner password for full access)
[editor saveEncryptedToPath:@"report-protected.pdf"
               userPassword:@""
              ownerPassword:@"admin2025"
                      error:&err];

Elixir

{:ok, editor} = PdfOxide.open_editor("report.pdf")
:ok = PdfOxide.set_producer(editor, "Finance Team")

# Save with AES-256 encryption (no open password, owner password for full access)
:ok = PdfOxide.editor_save_encrypted(editor, "report-protected.pdf", "", "admin2025")

以不同设置重新加密

Rust

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

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

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

完整 API 参考

Pdf 方法

方法	返回值	说明
save_encrypted(path, user_pw, owner_pw)	Result<()>	以 AES-256 和完整权限保存
save_with_encryption(path, config)	Result<()>	以自定义加密配置保存

DocumentEditor / EditableDocument 方法

方法	返回值	说明
save(path)	Result<()>	完整重写保存（不加密）
save_with_options(path, options)	Result<()>	以自定义选项保存

配置类型

类型	说明
EncryptionConfig	用户/所有者密码、算法、权限
EncryptionAlgorithm	Aes256、Aes128、Rc4_128、Rc4_40
Permissions	精细化访问控制标志
SaveOptions	完整重写、增量更新或加密保存

相关页面

• 编辑概览 – 打开、元数据和保存工作流
• 表单字段编辑 – 通过权限限制表单编辑
• 内容涂黑（Redaction） – 加密前涂黑内容
• 页面操作 – 最终加密前准备页面