在 Python、Rust、Go 中加密与解密 PDF

绑定支持情况。 解密（使用密码打开）在所有五个绑定中均可用。将新 PDF 保存为加密格式支持 Python、Rust、Go（DocumentEditor.SaveEncrypted）和 WASM（saveEncryptedToBytes）。C# 公开 API 通过 PdfDocument.OpenWithPassword 支持密码打开，但尚未提供公开的 SaveEncrypted 包装——如需在 C# 管道中生成加密输出，请使用 Rust CLI 或 Go/Python 绑定。

用密码加密 PDF：

Python

from pdf_oxide import PdfDocument

doc = PdfDocument("report.pdf")
doc.save_encrypted("protected.pdf", "userpass", "ownerpass")

WASM

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

const doc = new WasmPdfDocument(bytes);
const encrypted = doc.saveEncryptedToBytes("userpass", "ownerpass", true, true, true, true);
// encrypted is a Uint8Array
doc.free();

Rust

use pdf_oxide::api::Pdf;

let mut doc = Pdf::open("report.pdf")?;
doc.save_encrypted("protected.pdf", "userpass", "ownerpass")?;

Go

package main

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

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

    if err := editor.SaveEncrypted("protected.pdf", "userpass", "ownerpass"); err != nil {
        log.Fatal(err)
    }
}

C++

#include <pdf_oxide/pdf_oxide.hpp>

auto editor = pdf_oxide::DocumentEditor::open("report.pdf");
editor.save_encrypted("protected.pdf", "userpass", "ownerpass");

Swift

import PdfOxide

let editor = try DocumentEditor.open("report.pdf")
try editor.saveEncrypted("protected.pdf", userPassword: "userpass", ownerPassword: "ownerpass")

Dart

import 'package:pdf_oxide/pdf_oxide.dart';

final editor = DocumentEditor.open('report.pdf');
editor.saveEncrypted('protected.pdf', 'userpass', 'ownerpass');
editor.close();

R

library(pdfoxide)

editor <- pdf_editor_open("report.pdf")
pdf_editor_save_encrypted(editor, "protected.pdf", "userpass", "ownerpass")
pdf_editor_close(editor)

Julia

using PdfOxide

editor = open_editor("report.pdf")
save_encrypted(editor, "protected.pdf", "userpass", "ownerpass")

Zig

const pdf_oxide = @import("pdf_oxide");

var editor = try pdf_oxide.DocumentEditor.open("report.pdf");
defer editor.deinit();
try editor.saveEncrypted("protected.pdf", "userpass", "ownerpass");

Objective-C

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

POXDocumentEditor *editor = [POXDocumentEditor openEditor:@"report.pdf" error:&err];
[editor saveEncryptedToPath:@"protected.pdf"
               userPassword:@"userpass"
              ownerPassword:@"ownerpass"
                      error:&err];

Elixir

{:ok, editor} = PdfOxide.open_editor("report.pdf")
:ok = PdfOxide.editor_save_encrypted(editor, "protected.pdf", "userpass", "ownerpass")

打开加密的 PDF：

Python

from pdf_oxide import PdfDocument

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

WASM

const doc = new WasmPdfDocument(encryptedBytes);
doc.authenticate("userpass");
const text = doc.extractText(0);
console.log(text);
doc.free();

Rust

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

Go

doc, _ := pdfoxide.Open("protected.pdf")
defer doc.Close()

if _, err := doc.Authenticate("userpass"); err != nil { log.Fatal(err) }
text, _ := doc.ExtractText(0)
fmt.Println(text)

C#

using PdfOxide;

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

C++

auto doc = pdf_oxide::Document::open_with_password("protected.pdf", "userpass");
auto text = doc.extract_text(0);
std::cout << text << "\n";

Swift

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

Dart

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

R

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

Julia

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

Zig

var doc = try pdf_oxide.Document.openWithPassword("protected.pdf", "userpass");
defer doc.deinit();
const text = try doc.extractText(a, 0);
defer a.free(text);

Objective-C

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

Elixir

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

PDF Oxide 默认使用 AES-256 加密。采用 MIT 协议，没有 AGPL 之类的限制。

安装

pip install pdf_oxide

加密 PDF

基本加密

Python

from pdf_oxide import PdfDocument

doc = PdfDocument("input.pdf")
doc.save_encrypted("output.pdf", "user123", "owner456")

WASM

const doc = new WasmPdfDocument(bytes);
const encrypted = doc.saveEncryptedToBytes("user123", "owner456", true, true, true, true);
doc.free();

Rust

let mut doc = Pdf::open("input.pdf")?;
doc.save_encrypted("output.pdf", "user123", "owner456")?;

C++

auto editor = pdf_oxide::DocumentEditor::open("input.pdf");
editor.save_encrypted("output.pdf", "user123", "owner456");

Swift

let editor = try DocumentEditor.open("input.pdf")
try editor.saveEncrypted("output.pdf", userPassword: "user123", ownerPassword: "owner456")

Dart

final editor = DocumentEditor.open('input.pdf');
editor.saveEncrypted('output.pdf', 'user123', 'owner456');
editor.close();

R

editor <- pdf_editor_open("input.pdf")
pdf_editor_save_encrypted(editor, "output.pdf", "user123", "owner456")
pdf_editor_close(editor)

Julia

editor = open_editor("input.pdf")
save_encrypted(editor, "output.pdf", "user123", "owner456")

Zig

var editor = try pdf_oxide.DocumentEditor.open("input.pdf");
defer editor.deinit();
try editor.saveEncrypted("output.pdf", "user123", "owner456");

Objective-C

POXDocumentEditor *editor = [POXDocumentEditor openEditor:@"input.pdf" error:&err];
[editor saveEncryptedToPath:@"output.pdf"
               userPassword:@"user123"
              ownerPassword:@"owner456"
                      error:&err];

Elixir

{:ok, editor} = PdfOxide.open_editor("input.pdf")
:ok = PdfOxide.editor_save_encrypted(editor, "output.pdf", "user123", "owner456")

• 用户密码 — 打开并查看文档所必需
• 所有者密码 — 拥有完全权限（打印、复制、修改）所必需

仅设置打开密码

只设置用户密码，不限制任何操作：

doc = PdfDocument("input.pdf")
doc.save_encrypted("locked.pdf", "viewpass", "adminpass")

不设置打开密码，但限制操作

允许任何人查看，但禁止打印和复制：

Python

doc = PdfDocument("input.pdf")
doc.save_encrypted(
    "restricted.pdf",
    "",            # No password to open
    "adminpass",   # Owner password for full access
    allow_print=False,
    allow_copy=False,
    allow_modify=False,
    allow_annotate=False,
)

WASM

const doc = new WasmPdfDocument(bytes);
const restricted = doc.saveEncryptedToBytes(
    "",           // No password to open
    "adminpass",  // Owner password for full access
    false,        // allowPrint
    false,        // allowCopy
    false,        // allowModify
    false         // allowAnnotate
);
doc.free();

Rust

let config = EncryptionConfig::new("", "adminpass")
    .with_permissions(Permissions::none());
doc.save_with_encryption("restricted.pdf", config)?;

只允许打印

允许查看和打印，但禁止复制和修改：

Python

doc = PdfDocument("input.pdf")
doc.save_encrypted(
    "print-only.pdf",
    "",
    "adminpass",
    allow_print=True,
    allow_copy=False,
    allow_modify=False,
)

WASM

const doc = new WasmPdfDocument(bytes);
const printOnly = doc.saveEncryptedToBytes(
    "",           // No password to open
    "adminpass",
    true,         // allowPrint
    false,        // allowCopy
    false,        // allowModify
    true          // allowAnnotate
);
doc.free();

Rust

let config = EncryptionConfig::new("", "adminpass")
    .with_permissions(Permissions::print_only());
doc.save_with_encryption("print-only.pdf", config)?;

权限选项

参数	默认值	说明
allow_print	True	允许打印文档
allow_copy	True	允许复制文本和图形
allow_modify	True	允许修改内容
allow_annotate	True	允许添加注释

解密 PDF

用密码打开

Python

from pdf_oxide import PdfDocument

doc = PdfDocument("encrypted.pdf", password="secret")
text = doc.extract_text(0)
print(f"Pages: {doc.page_count()}")

WASM

const doc = new WasmPdfDocument(encryptedBytes);
doc.authenticate("secret");
const text = doc.extractText(0);
console.log(`Pages: ${doc.pageCount()}`);
doc.free();

Rust

let mut doc = Pdf::open_with_password("encrypted.pdf", "secret")?;
let text = doc.extract_text(0)?;
println!("Pages: {}", doc.page_count()?);

C++

auto doc = pdf_oxide::Document::open_with_password("encrypted.pdf", "secret");
auto text = doc.extract_text(0);
std::cout << "Pages: " << doc.page_count() << "\n";

Swift

let doc = try Document.openWithPassword("encrypted.pdf", password: "secret")
let text = try doc.extractText(0)
print("Pages: \(try doc.pageCount())")

Dart

final doc = PdfDocument.openWithPassword('encrypted.pdf', 'secret');
final text = doc.extractText(0);
print('Pages: ${doc.pageCount}');

R

doc <- pdf_open_with_password("encrypted.pdf", "secret")
text <- pdf_extract_text(doc, 0)
cat("Pages:", pdf_page_count(doc), "\n")

Julia

doc = open_with_password("encrypted.pdf", "secret")
text = extract_text(doc, 0)
println("Pages: ", page_count(doc))

Zig

var doc = try pdf_oxide.Document.openWithPassword("encrypted.pdf", "secret");
defer doc.deinit();
const text = try doc.extractText(a, 0);
defer a.free(text);
std.debug.print("Pages: {d}\n", .{try doc.pageCount()});

Objective-C

POXDocument *doc = [POXDocument openWithPassword:@"encrypted.pdf" password:@"secret" error:&err];
NSString *text = [doc extractText:0 error:&err];
NSLog(@"Pages: %ld", (long)[doc pageCountError:&err]);

Elixir

{:ok, doc} = PdfOxide.open_with_password("encrypted.pdf", "secret")
{:ok, text} = PdfOxide.extract_text(doc, 0)
{:ok, pages} = PdfOxide.page_count(doc)
IO.puts("Pages: #{pages}")

保存为未加密副本

打开加密的 PDF 并保存未加密副本：

Python

from pdf_oxide import PdfDocument

doc = PdfDocument("encrypted.pdf", password="secret")
doc.save("decrypted.pdf")

WASM

const doc = new WasmPdfDocument(encryptedBytes);
doc.authenticate("secret");
const decrypted = doc.save();
// decrypted is an unencrypted Uint8Array
doc.free();

Rust

let mut doc = Pdf::open_with_password("encrypted.pdf", "secret")?;
doc.save("decrypted.pdf")?;

用新密码重新加密

Python

from pdf_oxide import PdfDocument

doc = PdfDocument("old-protected.pdf", password="oldpass")
doc.save_encrypted("new-protected.pdf", "newuser", "newowner")

WASM

const doc = new WasmPdfDocument(encryptedBytes);
doc.authenticate("oldpass");
const reEncrypted = doc.saveEncryptedToBytes("newuser", "newowner", true, true, true, true);
doc.free();

Rust

let mut doc = Pdf::open_with_password("old-protected.pdf", "oldpass")?;
doc.save_encrypted("new-protected.pdf", "newuser", "newowner")?;

批量加密

加密目录下的全部 PDF：

from pdf_oxide import PdfDocument, PdfError
from pathlib import Path

input_dir = Path("reports/")
output_dir = Path("protected/")
output_dir.mkdir(exist_ok=True)

for pdf_path in input_dir.glob("*.pdf"):
    try:
        doc = PdfDocument(str(pdf_path))
        out_path = output_dir / pdf_path.name
        doc.save_encrypted(
            str(out_path),
            "company2025",
            "admin2025",
            allow_print=True,
            allow_copy=False,
        )
        print(f"Encrypted: {pdf_path.name}")
    except PdfError as e:
        print(f"Failed: {pdf_path.name}: {e}")

批量解密

使用已知密码解密目录下的全部 PDF：

from pdf_oxide import PdfDocument, PdfError
from pathlib import Path

input_dir = Path("protected/")
output_dir = Path("decrypted/")
output_dir.mkdir(exist_ok=True)

for pdf_path in input_dir.glob("*.pdf"):
    try:
        doc = PdfDocument(str(pdf_path), password="company2025")
        out_path = output_dir / pdf_path.name
        doc.save(str(out_path))
        print(f"Decrypted: {pdf_path.name}")
    except PdfError as e:
        print(f"Failed: {pdf_path.name}: {e}")

支持的算法

PDF Oxide 支持所有标准的 PDF 加密算法：

算法	密钥长度	安全强度
AES-256	256 位	最强（默认）
AES-128	128 位	强
RC4-128	128 位	遗留
RC4-40	40 位	弱（仅用于兼容）

save_encrypted() 默认使用 AES-256。如果想显式指定算法，请使用 Rust API 的 EncryptionConfig。

为什么不用 pdfplumber 或 pdfminer？

pdfplumber 和 pdfminer 都不能处理加密 PDF：

• pdfplumber — 遇到带密码的 PDF 会直接报错，不支持解密。
• pdfminer — 加密支持有限，对 AES-256 加密的文件会失败。
• pypdf — 支持解密，但解密后提取文本比 PDF Oxide 慢 15 倍。

如果需要大规模处理加密 PDF，PDF Oxide 可以原生完成解密与加密，覆盖 AES-128 与 AES-256。

相关页面

• 加密与安全 API — 完整的加密 API 参考
• 批量处理 — 并行处理模式
• Python 快速上手 — 安装与基础