在swift中加密和解密超过132个字符

我有这个rsa-swift代码,它很好地工作,加密或递减数据,但是当string.count超过132个字符时,错误递减和加密数据,我如何对超过132个字符的数据进行递减和加密? 我的RSA课程是,我不想分开我的数据

class RSAWrapper {
    private var publicKey : SecKey?
    private var privateKey : SecKey?

    func generateKeyPair(keySize: UInt, privateTag: String, publicTag: String) -> Bool {

        self.publicKey = nil
        self.privateKey = nil

        if (keySize != 512 && keySize != 1024 && keySize != 2048) {
            // Failed
            print("kelid kharab ast")
            return false
        }

        let publicKeyParameters: [NSString: AnyObject] = [
            kSecAttrIsPermanent: true as AnyObject,
            kSecAttrApplicationTag: publicTag as AnyObject
        ]
        let privateKeyParameters: [NSString: AnyObject] = [
            kSecAttrIsPermanent: true as AnyObject,
            kSecAttrApplicationTag: publicTag as AnyObject
        ]
        let parameters: [String: AnyObject] = [
            kSecAttrKeyType as String: kSecAttrKeyTypeRSA,
            kSecAttrKeySizeInBits as String: keySize as AnyObject,
            kSecPrivateKeyAttrs as String: privateKeyParameters as AnyObject,
            kSecPublicKeyAttrs as String: publicKeyParameters as AnyObject
        ];

        let status : OSStatus = SecKeyGeneratePair(parameters as CFDictionary, &(self.publicKey), &(self.privateKey))

        return (status == errSecSuccess && self.publicKey != nil && self.privateKey != nil)
    }

    func encrypt(text: String) -> [UInt8] {
        let plainBuffer = [UInt8](text.utf8)
        var cipherBufferSize : Int = Int(SecKeyGetBlockSize((self.publicKey)!))
        var cipherBuffer = [UInt8](repeating:0, count:Int(cipherBufferSize))

        // Encrypto  should less than key length
        let status = SecKeyEncrypt((self.publicKey)!, SecPadding.PKCS1, plainBuffer, plainBuffer.count, &cipherBuffer, &cipherBufferSize)
        if (status != errSecSuccess) {
            print("Failed Encryption")
        }
        return cipherBuffer
    }

    func decprypt(encrpted: [UInt8]) -> String? {
        var plaintextBufferSize = Int(SecKeyGetBlockSize((self.privateKey)!))
        var plaintextBuffer = [UInt8](repeating:0, count:Int(plaintextBufferSize))

        let status = SecKeyDecrypt((self.privateKey)!, SecPadding.PKCS1, encrpted, plaintextBufferSize, &plaintextBuffer, &plaintextBufferSize)

        if (status != errSecSuccess) {
            print("Failed Decrypt")
            return nil
        }
        return NSString(bytes: &plaintextBuffer, length: plaintextBufferSize, encoding: String.Encoding.utf8.rawValue)! as String
    }


    func encryptBase64(text: String) -> String {
        let plainBuffer = [UInt8](text.utf8)
        var cipherBufferSize : Int = Int(SecKeyGetBlockSize((self.publicKey)!))
        var cipherBuffer = [UInt8](repeating:0, count:Int(cipherBufferSize))

        // Encrypto  should less than key length
        let status = SecKeyEncrypt((self.publicKey)!, SecPadding.PKCS1, plainBuffer, plainBuffer.count, &cipherBuffer, &cipherBufferSize)
        if (status != errSecSuccess) {
            print("Failed Encryption")
        }

        let mudata = NSData(bytes: &cipherBuffer, length: cipherBufferSize)
        return mudata.base64EncodedString(options: NSData.Base64EncodingOptions.lineLength64Characters)
    }

    func decpryptBase64(encrpted: String) -> String? {

        let data : NSData = NSData(base64Encoded: encrpted, options: .ignoreUnknownCharacters)!
        let count = data.length / MemoryLayout<UInt8>.size
        var array = [UInt8](repeating: 0, count: count)
        data.getBytes(&array, length:count * MemoryLayout<UInt8>.size)

        var plaintextBufferSize = Int(SecKeyGetBlockSize((self.privateKey)!))
        var plaintextBuffer = [UInt8](repeating:0, count:Int(plaintextBufferSize))

        let status = SecKeyDecrypt((self.privateKey)!, SecPadding.PKCS1, array, plaintextBufferSize, &plaintextBuffer, &plaintextBufferSize)

        if (status != errSecSuccess) {
            print("Failed Decrypt")
            return nil
        }
        return NSString(bytes: &plaintextBuffer, length: plaintextBufferSize, encoding: String.Encoding.utf8.rawValue)! as String
    }


    func getPublicKey() -> SecKey? {
        return self.publicKey
    }

    func getPrivateKey() -> SecKey? {
        return self.privateKey
    }

我试图更改uint8,但当我执行该错误时,我必须做什么?