microsoft-metro – 地铁式应用中的RSA加密

我有公钥模数和公钥指数,我需要在metro风格的应用程序中生成公钥并加密数据.在c#中我们有RSAParameters类,但我找不到任何类似于metro风格应用程序的东西.

当我使用从证书直接接收的base64encoded公钥并尝试使用以下代码导入密钥时,我得到异常抛出的ASN1错误标记值.
我认为这是由于数据格式无效.

//sample dummy key from certificate in base64encoded
     string key =   @"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";
       symmetricKeyAlgorithmProvider asymmAlg = AsymmetricKeyAlgorithmProvider.OpenAlgorithm("RSA_OAEP_SHA1");
       CryptographicKey publicKey = asymmAlg.ImportPublicKey(CryptographicBuffer.DecodeFromBase64String(key));
        string input64string ="encrypt this";
        IBuffer dataToEncrypt = CryptographicBuffer.DecodeFromBase64String(input64string);
        IBuffer encryptedData = CryptographicEngine.Encrypt(publicKey,dataToEncrypt,null);

解决方法

您的密钥是公钥的模数部分,其长度为128.考虑从Metro中的C#代码导出的标准密钥：

using System.Runtime.InteropServices.WindowsRuntime;
CryptographicKey standardKeyPair = provider.CreateKeyPair(1024);
byte[] standardKey = standardKeyPair.ExportPublicKey(CryptographicpublicKeyBlobType.Pkcs1RsaPublicKey).ToArray();

你可以看到byte [] standardKey的长度是140,它有7位前缀和5位尾.我不知道原因,但我将额外的12位复制到已知密钥,它可以工作.希望这可以帮助你：

public static IBuffer RSAEncrypt(this IBuffer dataToEncrypt,string publicKeyN)
{
    AsymmetricKeyAlgorithmProvider provider = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaPkcs1);

    CryptographicKey standardKeyPair = provider.CreateKeyPair(1024);
    byte[] standardKey = standardKeyPair.ExportPublicKey(CryptographicpublicKeyBlobType.Pkcs1RsaPublicKey).ToArray();
    var data_n = CryptographicBuffer.DecodeFromBase64String(publicKeyN).ToArray();
    Array.Copy(data_n,standardKey,7,data_n.Length);
    var key = provider.ImportPublicKey(standardKey.AsBuffer(),CryptographicpublicKeyBlobType.Pkcs1RsaPublicKey);

    var result = CryptographicEngine.Encrypt(key,null);
    return result;          
}

microsoft-metro – 地铁式应用中的RSA加密

解决方法

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