macOS文件加密与解密实例及技术解答

通过示例代码演示在macOS上使用Swift语言实现文件的加密与解密功能。采用常见的对称加密算法AES，通过CryptoKit库提供的API实现文件的安全存储和读取。

import Foundation
import CryptoKit

// 加密文件
func encryptFile(filePath: String, key: SymmetricKey) throws {
    let plaintext = try Data(contentsOf: URL(fileURLWithPath: filePath))
    let sealedBox = try AES.GCM.seal(plaintext, using: key)
    try sealedBox.combined.write(to: URL(fileURLWithPath: filePath + ".encrypted"))
}

// 解密文件
func decryptFile(filePath: String, key: SymmetricKey) throws {
    let ciphertext = try Data(contentsOf: URL(fileURLWithPath: filePath))
    let sealedBox = try AES.GCM.SealedBox(combined: ciphertext)
    let decryptedData = try AES.GCM.open(sealedBox, using: key)
    try decryptedData.write(to: URL(fileURLWithPath: filePath.replacingOccurrences(of: ".encrypted", with: "_decrypted")))
}

// 使用示例
let key = SymmetricKey(size: .bits256)
try encryptFile(filePath: "/path/to/file.txt", key: key)
try decryptFile(filePath: "/path/to/file.txt.encrypted", key: key)

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