Question

下面是我的android java代码，实际上如何在IOS Swift3中编写这个？

 final SecretKey key = new SecretKeySpec(keyBytes, "DESede");

 final Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");

 cipher.init(Cipher.ENCRYPT_MODE, key);

 final byte[] cipherText = cipher.doFinal(plainTextBytes);

Answer 1

在SO上找到AES或DES Common Crypto示例，并根据需要对3DES进行更改。确保密钥是24字节。

变化：

算法：CCAlgorithm3DES
模式：kCCModeECB
选项：ccPKCS7Padding

如果密钥是16字节，则它是双键3DES，复制并将前8个字节附加到密钥的末尾以创建24字节密钥。

注意：DESede称为3DES或Tripple-DES。

3DES真的不安全，尤其是双键3DES。如果可能的话，随机IV更新到AES-CBC。

这是未经测试的Swift 3（也应该使用Swift4）代码，请注意上面密钥长度的警告：

func trippleDESCrypt(data:Data, keyData:Data, ivData:Data, operation:Int) -> Data? {
    let cryptLength = size_t(data.count + kCCBlockSize3DES)
    var cryptData = Data(repeating:0, count:cryptLength)
    var numBytesEncrypted :size_t = 0

    let keyLength             = keyData.count
    let algoritm: CCAlgorithm = UInt32(kCCAlgorithm3DES)
    let options:  CCOptions   = UInt32(kCCOptionPKCS7Padding | kCCModeECB)

    let cryptStatus = cryptData.withUnsafeMutableBytes {cryptBytes in
        data.withUnsafeBytes {dataBytes in
            ivData.withUnsafeBytes {ivBytes in
                keyData.withUnsafeBytes {keyBytes in
                    CCCrypt(CCOperation(operation),
                            algoritm,
                            options,
                            keyBytes, keyLength,
                            ivBytes,
                            dataBytes, data.count,
                            cryptBytes, cryptLength,
                            &numBytesEncrypted)
                }
            }
        }
    }

    if UInt32(cryptStatus) == UInt32(kCCSuccess) {
        cryptData.count = numBytesEncrypted
    }
    else {
        print("Error: \(cryptStatus)")
        return nil
    }

    return cryptData
}

像往常一样，您需要一个包含导入的桥接头文件：

#import <CommonCrypto/CommonCrypto.h>

你需要包含框架：

Security.framework.

IOS Swift3 DES，ECB，填充加密

1 个答案: