iOS AES 256 解密在 swift 中不起作用

Question

我有一些数据将在 JSON 响应中加密的场景。 所以我在swift中尝试了一些库来解密。 但最终我没能做到。

所以我尝试了这个库WebCrypto ： https://github.com/etienne-martin/WebCrypto.swift

哪个工作正常，但调用是异步的，我需要同步。

早些时候我试过这些

1. RNCryptor ： https://github.com/RNCryptor/RNCryptor
2. CryptoSwift ： https://github.com/krzyzanowskim/CryptoSwift

RNCryptor：代码

    import RNCryptor

class DemoRNCryptor {

    class func run() {

        // Encryption

        let data = "my message is not ready".data(using: String.Encoding.utf8)!
        let password = "MySecretKey12345"
        let encryptedData = RNCryptor.encrypt(data: data, withPassword: password)
        print("RNCryptor enc:", encryptedData.hexString)


        // Decryption

        do {
            let originalData = try RNCryptor.decrypt(data: encryptedData, withPassword: password)
            let dd = String(data: originalData, encoding: .utf8)
            print("RNCryptor dec:", dd)
        } catch {
            print(error)
        }
    }
    }

CryptoSwift：代码

import CryptoSwift


    extension String {

    func aesEncryptCS(key: String) throws -> String {

        var result = ""

        do {

            let key: [UInt8] = Array(key.utf8) as [UInt8]
            let aes = try AES(key: key, blockMode: ECB(), padding: .pkcs5) // AES128 .ECB pkcs7
            let encrypted = try aes.encrypt(Array(self.utf8))

            result = encrypted.toBase64()!

            print("AES Encryption Result: \(result)")

        } catch {

            print("Error: \(error)")
        }

        return result
    }

    func aesDecryptCS(key: String) throws -> String {

        var result = ""

        do {

            let encrypted = self
            let key: [UInt8] = Array(key.utf8) as [UInt8]
            let aes = try AES(key: key, blockMode: ECB(), padding: .pkcs5) // AES128 .ECB pkcs7
            let decrypted = try aes.decrypt(Array(base64: encrypted))

            result = String(data: Data(decrypted), encoding: .utf8) ?? ""

            print("AES Decryption Result: \(result)")

        } catch {

            print("Error: \(error)")
        }

        return result
    }

}

我有一个密钥 = “消息”和加密文本（“我的消息尚未准备好”） =“ U2FsdGVkX187YbST7kZBjdhI6tGa2YQE5e3bS4WNhaXgi0iy//q5TOfR/q6Sc1Lx ”

如何使用上述两个库中的任何一个来解密此字符串？

我总是得到零或无效的密钥大小。

Answer 1

“U2FsdGVkX187YbST7kZBjdhI6tGa2YQE5e3bS4WNhaXgi0iy//q5TOfR/q6Sc1Lx”

这是 Base64 编码数据，您需要先对其进行解码，例如：

let encrypted = [UInt8](base64: "U2FsdGVkX187YbST7kZBjdhI6tGa2YQE5e3bS4WNhaXgi0iy//q5TOfR/q6Sc1Lx")

键=“消息”

假设这实际上是您使用的密钥：

let key = "Message".bytes

所以这给了我们：

let key = "Message".bytes

let aes = try AES(key: key, blockMode: ECB(), padding: .pkcs5)
let encrypted = try aes.encrypt("some string".bytes))
let encryptedBase64 = encrypted.toBase64()