Java UWP标准CMS包络加密

我需要在加密消息语法（CMS）中实现AES加密算法，以在Windows Universal App（查找参考）中加密我的数据。我已经使用Bouncy Castle库在Java上实现了它，并使用了以下代码（我需要C#UWP中的相同功能）：

现在我已经在我的UWP应用程序中引用了Bouncy Castle V 1.8.1，但我发现了许多不同之处（一些库在Java中使用，但在Windows中不存在），并且无法在C#中实现此类功能

因此，请指导我使用本机UWP加密库

Windows.Security.Cryptography

（首选）实现相同的功能

或者告诉我如何在C#UWP应用程序中使用Bouncy Castle 1.8.1实现相同的功能

更新：

根据以下图表，我了解到所需步骤如下：

1-获取数据并生成对称密钥，以使用算法AESCBCCPKCS7加密数据

2-使用公钥加密对称密钥

3-生成数字信封消息

因此，根据我的理解，我使用以下c#代码完成了前两步（如果我错了，请纠正我），我需要帮助完成第三步：

public string EncryptAndEnvelope(string openText, string p_key)
{
    // Step 1 Get the data and generate Symmetric Key to encrypt the data using algorithm AesCbcPkcs7
    IBuffer cBuffer = CryptographicBuffer.GenerateRandom(32);
    SymmetricKeyAlgorithmProvider provider = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesCbcPkcs7);
    CryptographicKey m_key = provider.CreateSymmetricKey(cBuffer);
    IBuffer bufferMsg = CryptographicBuffer.ConvertStringToBinary(AsciiToString(StringToAscii(openText)), BinaryStringEncoding.Utf8);
    IBuffer bufferEncrypt = CryptographicEngine.Encrypt(m_key, bufferMsg, null);

    // Step 2 Encrypt Symmetric Key using the public key
    IBuffer publicKey = CryptographicBuffer.DecodeFromBase64String(p_key);
    AsymmetricKeyAlgorithmProvider asym = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaPkcs1);
    CryptographicKey ckey = asym.ImportPublicKey(publicKey, CryptographicPublicKeyBlobType.X509SubjectPublicKeyInfo);
    IBuffer cbufferEncrypt = CryptographicEngine.Encrypt(ckey, cBuffer, null);

    // Step 3 Generate Digitally enveloped message
    // I need help here
}

private byte[] StringToAscii(string s)
    {
        byte[] retval = new byte[s.Length];
        for (int ix = 0; ix < s.Length; ++ix)
          {
            char ch = s[ix];
            if (ch <= 0x7f) retval[ix] = (byte)ch;
            else retval[ix] = (byte)'?';
          }
        return retval;
    }

private string AsciiToString(byte[] bytes)
{
    return string.Concat(bytes.Select(b => b <= 0x7f ? (char)b : '?'));
}

public string encryptandenvelop（string openText，string p_key）
{
//步骤1：获取数据并生成对称密钥，使用AesCbcPkcs7算法对数据进行加密
IBuffer cBuffer=加密缓冲区.generateradom（32）；
SymmetricKeyAlgorithmProvider=SymmetricKeyAlgorithmProvider.OpenAlgorithm（SymmetricAlgorithmNames.AESCBCCPKCS7）；
CryptographicKey m_key=provider.CreateSymmetricKey（cBuffer）；
IBuffer bufferMsg=CryptographicBuffer.ConvertStringToBinary（AsciiToString（StringToAscii（openText）），BinaryStringEncoding.Utf8）；
IBuffer bufferEncrypt=CryptographicEngine.Encrypt（m_key，bufferMsg，null）；
//步骤2使用公钥加密对称密钥
IBuffer publicKey=加密缓冲区。DecodeFromBase64String（p_密钥）；
AsymmetricKeyAlgorithmProvider Asymm=AsymmetricKeyAlgorithmProvider.OpenAlgorithm（AsymetrichGorithmNames.RsaPkcs1）；
CryptographicKey ckey=asym.ImportPublicKey（公钥，CryptographicPublicKeyBlobType.X509SubjectPublicKeyInfo）；
IBuffer cbufferencerypt=加密引擎.Encrypt（ckey，cBuffer，null）；
//步骤3生成数字信封消息
//我需要帮助
}
专用字节[]StringToAscii（字符串s）
{
byte[]retval=新字节[s.Length]；
对于（int-ix=0；ixpublic string EncryptAndEnvelope(string openText, string p_key)
{
    // Step 1 Get the data and generate Symmetric Key to encrypt the data using algorithm AesCbcPkcs7
    IBuffer cBuffer = CryptographicBuffer.GenerateRandom(32);
    SymmetricKeyAlgorithmProvider provider = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesCbcPkcs7);
    CryptographicKey m_key = provider.CreateSymmetricKey(cBuffer);
    IBuffer bufferMsg = CryptographicBuffer.ConvertStringToBinary(AsciiToString(StringToAscii(openText)), BinaryStringEncoding.Utf8);
    IBuffer bufferEncrypt = CryptographicEngine.Encrypt(m_key, bufferMsg, null);

    // Step 2 Encrypt Symmetric Key using the public key
    IBuffer publicKey = CryptographicBuffer.DecodeFromBase64String(p_key);
    AsymmetricKeyAlgorithmProvider asym = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaPkcs1);
    CryptographicKey ckey = asym.ImportPublicKey(publicKey, CryptographicPublicKeyBlobType.X509SubjectPublicKeyInfo);
    IBuffer cbufferEncrypt = CryptographicEngine.Encrypt(ckey, cBuffer, null);

    // Step 3 Generate Digitally enveloped message
    // I need help here
}

private byte[] StringToAscii(string s)
    {
        byte[] retval = new byte[s.Length];
        for (int ix = 0; ix < s.Length; ++ix)
          {
            char ch = s[ix];
            if (ch <= 0x7f) retval[ix] = (byte)ch;
            else retval[ix] = (byte)'?';
          }
        return retval;
    }

private string AsciiToString(byte[] bytes)
{
    return string.Concat(bytes.Select(b => b <= 0x7f ? (char)b : '?'));
}