使用 RSA 从 Swift 加密到 C#

Question

我正在尝试加密用户名和密码并将其发送到具有 RSA 的网站。我一直在网上搜索，但没有找到任何东西。我从 .Net WebServer 中以 XML 形式获得 Public 密钥，如下所示：

<RSAKeyValue>
<Modulus>vB/j1viHNHdSSnD1JwrZKu93GZtXO/oQAzp90w/QRQC7s7RO4PhTcW3ADOUVB1+BlmbaFsEreNUAOV5P4aZh+68T+InwmU1javFsGkjCcVoQO/uEpp2zjrM9Eh84OPaKH429GVmdfTgUj0YbmYVanM3HX4byMH25DKQD687b7x8=
</Modulus>
<Exponent>AQAB</Exponent>
</RSAKeyValue>

所以我必须用这个密钥加密它，我用 XCode 8 和 Swift 3。使用 .Net C· 非常简单。

RSACryptoServiceProvider encryptKey = new RSACryptoServiceProvider(); 
UnicodeEncoding encoding = new UnicodeEncoding();
encryptKey.FromXmlString(XML PublicKey);
byte[] usr = encryptKey.Encrypt(encoding.GetBytes(txtUser.Text),false);
byte[] pwd = encryptKey.Encrypt(encoding.GetBytes(txtPassword.Text),false);

¿有人可以帮助我吗？谢谢

已更新

我尝试了这段代码，但是 public 密钥是在 Mac 中生成的 OS 工作正常，但是我从服务器获得的 public 密钥不起作用，我不知道为什么？ @Charles Srstka

let pubKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDzZtW7ETOkJGTwN/4adYI5oQZ7U7EPzfDtpZTf+cQ9zAcmcC6g6uAC6KuovBSsigcUNzw3s2eNh0RvYBl6ipJ71hH1awTBwVEWo4fl7uIqdpBjwvO1wWXg9UifpvSsV3GPff9YqMvuggDznOGc20CvsXusQKt9dDx8ESxP6yjqiwIDAQAB"
let keyData = NSData(base64Encoded: pubKey, options: NSData.Base64DecodingOptions.ignoreUnknownCharacters)            
var dict: [NSString: AnyObject] = [
      kSecClass: kSecClassKey,
        kSecAttrKeyType: kSecAttrKeyTypeRSA,
        kSecAttrKeySizeInBits: pubKey.utf8.count as AnyObject,
        kSecAttrKeyClass: kSecAttrKeyClassPublic,
        kSecAttrApplicationTag: "me.lhu" as AnyObject,
        kSecValueData: keyData as AnyObject,
        kSecReturnRef: true as AnyObject
];            
SecItemDelete(dict as CFDictionary)
var err = SecItemAdd(dict as CFDictionary, nil);
if ((err != noErr)) {
    print("error loading public key");
}        
var resultData: SecKey? = nil
var result: AnyObject?
err = SecItemCopyMatching(dict as CFDictionary, &result)
if err == noErr, let keyRef as! SecKey {       
    let plaintext = tf_taikhoan.text                    
    let plaintextLen = plaintext?.lengthOfBytes(using: String.Encoding.utf8)
    let plaintextBytes = [UInt8](plaintext!.utf8)                    
    var encryptedLen: Int = SecKeyGetBlockSize(keyRef)
    var encryptedBytes = [UInt8](repeating: 0, count: encryptedLen)                    
    err = SecKeyEncrypt(keyRef, SecPadding.PKCS1, plaintextBytes, plaintextLen!, &encryptedBytes, &encryptedLen);
    if (err != noErr) {
        print(encryptedBytes);
    }
}

Answer 1

如果您需要 macOS 10.12 或 iOS 10，请使用 SecKey API：

https://developer.apple.com/library/content/documentation/Security/Conceptual/CertKeyTrustProgGuide/Encryption.html

如果您必须支持旧版本的 macOS 或 iOS，您可以使用 Security Transforms 在 macOS/iOS 上进行加密和解密，您可以在此处找到相关文档：

https://developer.apple.com/library/content/documentation/Security/Conceptual/SecTransformPG/EncryptionandDecryption/EncryptionandDecryption.html#//apple_ref/doc/uid/TP40010801-CH3-SW1

使用 RSA 从 Swift 加密到 C#

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