Encrypt & Decrypt a PDF using Swift for iOS

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//
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//  Copyright © 2017-2025 PSPDFKit GmbH. All rights reserved.
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//
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//  The Nutrient sample applications are licensed with a modified BSD license.
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//  Please see License for details. This notice may not be removed from this file.
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//
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import PSPDFKit
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import PSPDFKitUI
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class EncryptDecryptDocumentExample: Example {
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  override init() {
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        super.init()
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        title = "Encrypt and decrypt a PDF"
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        contentDescription = "Example how to encrypt and decrypt PDF."
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        category = .security
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        let originalURL = AssetLoader.assetURL(for: .annualReport)
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        let cryptor = Cryptor()
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        let key = cryptor.key(fromPassphrase: "passphrase", salt: "salt")
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        // Encrypt the original PDF
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        let encryptedURL = FileHelper.temporaryPDFFileURL(prefix: "encrypted")
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        do {
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            try cryptor.encrypt(from: originalURL, to: encryptedURL, key: key)
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        } catch {
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            print("Encryption failed with error: \(error.localizedDescription)")
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        }
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        // Decrypt the encrypted PDF
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        let decryptedURL = FileHelper.temporaryPDFFileURL(prefix: "PSPDFCryptorTests")
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        do {
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            try cryptor.decrypt(from: encryptedURL, to: decryptedURL, key: key)
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        } catch {
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            print("Decrypton failed with error: \(error.localizedDescription)")
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        }
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        // Open the decrypted PDF
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        let document = Document(url: decryptedURL)
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        return PDFViewController(document: document)
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    }
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}