使用非对称密钥在UWP进行编码/解码

Question

我正在尝试找到一种使用私钥加密字符串并使用公钥解密它的方法。我使用OpenSSL生成密钥，如下所述：

http://www.akadia.com/services/ssh_test_certificate.html

这就是我目前拥有的

public static string Encrypt(string str, string key)
{
    try
    {
        key = key.Replace(Environment.NewLine, "");
        IBuffer keyBuffer = CryptographicBuffer.DecodeFromBase64String(key);

        AsymmetricKeyAlgorithmProvider provider = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaPkcs1);

        CryptographicKey publicKey = provider.ImportPublicKey(keyBuffer, CryptographicPublicKeyBlobType.Pkcs1RsaPublicKey);
        IBuffer dataBuffer = CryptographicBuffer.CreateFromByteArray(Encoding.UTF8.GetBytes(str));
        var encryptedData = CryptographicEngine.Encrypt(publicKey, dataBuffer, null);

        return CryptographicBuffer.EncodeToBase64String(encryptedData);
    }
    catch (Exception e)
    {
        throw;
        return "Error in Encryption:With RSA ";
    }
}

然而，在< code>ImportPublicKey方法上，我得到一个异常< code>ASN1损坏数据

传递给该方法的字符串key具有以下格式：

var privateKey =

@“MIICXWIBAAKBGQDUTQFSNFIQX3AEPORHJYCCK007CFU4FXLUTIYF6U9IPDHYPD…yDxwZVmexltyK5Bwc26lmb 5ETEIC kZToYWcCucF8lsok=”；

所以OpenSSL生成的密钥文件的内容没有这部分：

-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY-----

Answer 1

好吧，所以我的代码是相当错误的，因为我想用私钥加密，但使用了< code>ImportPublicKey函数，正确的方法应该是；

public static string Encrypt(string str, string key)
{
    try
    {
        key = key.Replace(Environment.NewLine, "");
        IBuffer keyBuffer = CryptographicBuffer.DecodeFromBase64String(key);

        AsymmetricKeyAlgorithmProvider provider = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaPkcs1);

        var keyPar = provider.ImportKeyPair(keyBuffer, CryptographicPrivateKeyBlobType.Pkcs1RsaPrivateKey);
        //CryptographicKey publicKey = provider.ImportPublicKey(keyBuffer, CryptographicPublicKeyBlobType.Pkcs1RsaPublicKey);
        IBuffer dataBuffer = CryptographicBuffer.CreateFromByteArray(Encoding.UTF8.GetBytes(str));
        var encryptedData = CryptographicEngine.Encrypt(keyPar, dataBuffer, null);
        var encryptedStr = CryptographicBuffer.EncodeToBase64String(encryptedData);
        var signature = CryptographicEngine.Sign(keyPar, dataBuffer);
        var signatureStr = CryptographicBuffer.EncodeToBase64String(signature);
        return encryptedStr;
    }
    catch (Exception e)
    {
        throw;
        return "Error in Encryption:With RSA ";
    }
}

这可以使用RSA私钥对字符串进行加密。

但是，当我尝试使用公钥解密时，使用以下类似方法；

public static string Decrypt(string str, string key)
{
    try
    {
        key = key.Replace(Environment.NewLine, "");
        IBuffer keyBuffer = CryptographicBuffer.DecodeFromBase64String(key);

        AsymmetricKeyAlgorithmProvider provider = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaSignPkcs1Sha256);

        CryptographicKey publicKey = provider.ImportPublicKey(keyBuffer, CryptographicPublicKeyBlobType.X509SubjectPublicKeyInfo);
        IBuffer dataBuffer = CryptographicBuffer.CreateFromByteArray(Encoding.UTF8.GetBytes(str));
        var encryptedData = CryptographicEngine.Decrypt(publicKey, dataBuffer, null);
        return CryptographicBuffer.EncodeToBase64String(encryptedData);
    }
    catch (Exception e)
    {
        throw;
        return "Error in Decryption:With RSA ";
    }
}

我得到一个< code > Method or operation not implemented(方法或操作未实现)异常，要么仍然有问题，要么在UWP还没有私有加密/公共解密方法。

我最后做的是让nuget软件包＜code＞可移植。BouncyCastle签名，并遵循此答案中的代码段：

C#BouncyCastle-使用公钥/私钥进行RSA加密

像沙姆一样工作。