在某些情况下，由于解密的字符串变为空，因此将通用加密AESEncryption迁移到CryptoSWIFT [英] Migrating Common Crypto AESEncryption to CryptoSWIFT as decrypted string turns null in some cases

问题描述

我使用以下代码通过AES加密对字符串进行加密和解密.我通过添加桥接头来使用普通加密.

Im using the following code to encrypt and decrypt a string using AES Encryption.I'm using common crypto by adding a Bridging Header.

extension String {

    func aesEncrypt(key:String, iv:String, options:Int = kCCOptionPKCS7Padding) -> String? {
        if let keyData = key.data(using: String.Encoding.utf8),
            let data = self.data(using: String.Encoding.utf8),
            let cryptData    = NSMutableData(length: Int((data.count)) + kCCBlockSizeAES128) {


            let keyLength              = size_t(kCCKeySizeAES128)
            let operation: CCOperation = UInt32(kCCEncrypt)
            let algoritm:  CCAlgorithm = UInt32(kCCAlgorithmAES128)
            let options:   CCOptions   = UInt32(options)



            var numBytesEncrypted :size_t = 0

            let cryptStatus = CCCrypt(operation,
                                      algoritm,
                                      options,
                                      (keyData as NSData).bytes, keyLength,
                                      iv,
                                      (data as NSData).bytes, data.count,
                                      cryptData.mutableBytes, cryptData.length,
                                      &numBytesEncrypted)

            if UInt32(cryptStatus) == UInt32(kCCSuccess) {
                cryptData.length = Int(numBytesEncrypted)
                let base64cryptString = cryptData.base64EncodedString(options: .lineLength64Characters)
                return base64cryptString


            }
            else {
                return nil
            }
        }
        return nil
    }

    func aesDecrypt(key:String, iv:String, options:Int = kCCOptionPKCS7Padding) -> String? {
        if let keyData = key.data(using: String.Encoding.utf8),
            let data = NSData(base64Encoded: self, options: .ignoreUnknownCharacters),
            let cryptData    = NSMutableData(length: Int((data.length)) + kCCBlockSizeAES128) {

            let keyLength              = size_t(kCCKeySizeAES128)
            let operation: CCOperation = UInt32(kCCDecrypt)
            let algoritm:  CCAlgorithm = UInt32(kCCAlgorithmAES128)
            let options:   CCOptions   = UInt32(options)

            var numBytesEncrypted :size_t = 0

            let cryptStatus = CCCrypt(operation,
                                      algoritm,
                                      options,
                                      (keyData as NSData).bytes, keyLength,
                                      iv,
                                      data.bytes, data.length,
                                      cryptData.mutableBytes, cryptData.length,
                                      &numBytesEncrypted)

            if UInt32(cryptStatus) == UInt32(kCCSuccess) {
                cryptData.length = Int(numBytesEncrypted)
                let unencryptedMessage = String(data: cryptData as Data, encoding:String.Encoding.utf8)
                return unencryptedMessage
            }
            else {
                return nil
            }
        }
        return nil
    }


}

在某些情况下，解密后的字符串返回null，这会导致程序崩溃.我目前正在尝试用CryptoSwift替换它，但是我不知道如何设置加密方案以匹配这些设置.

In some cases the decrypted string returns null, this leads to program crash.Im currently trying to replace this with CryptoSwift,but I cannot figure out how to set the Encryption Scheme to match these settings.Please advice.

推荐答案

检查自述文件 https://github.com/krzyzanowskim/CryptoSwift#aes 在这里，您将找到可以直接用于您的需求的AES示例.例如.要加密数据，请执行以下操作:

Check the README https://github.com/krzyzanowskim/CryptoSwift#aes here you'll find the AES examples that should be straightforward to use for your needs. Eg. To encrypt data, you do this:

do {
    let aes = try AES(key: "keykeykeykeykeyk", iv: "drowssapdrowssap") // aes128
    let ciphertext = try aes.encrypt(data.bytes)
} catch { }

这篇关于在某些情况下，由于解密的字符串变为空，因此将通用加密AESEncryption迁移到CryptoSWIFT的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！