C# 如何使用 PGP 公钥简单地加密文本文件? [英] C# How to simply encrypt a text file with a PGP Public Key?

问题描述

我已经研究了一些关于如何实现我在问题中所说的内容并发现了几个 API，但它们中的大多数看起来非常复杂，而且由于我只是这方面的菜鸟，所以我只想要一个简单的方法，例如:

I've researched a bit about how to achieve what I said in the question and found several APIs but most of them look very complicated and since I'm just a noobie in this area I just want a simple method like:

public String Encrypt(String message, PublicKey publicKey)

不知道能不能做到?如果没有，那么请有人启发我实现这一目标的另一种方法:)

Don't know if this can be done? If not then please someone enlighten me another way to achieve this :)

谢谢.

更新:

到目前为止，我只看到 OpenPGP 加密的所有库都需要公钥和私钥来进行加密，而我只想用公钥加密(因为我没有私钥使用它)！

So far I have only seen that all of the library for OpenPGP encryption require both the public key and private key to do the encrypt while I only want to encrypt with the public key (because I don't have the private key to use it)!

推荐答案

我找到了一个教程 这里 但它需要密钥和公钥来加密数据.但是，我对代码做了一些修改，只需要公钥(无签名，无压缩)，并认为我应该在这里发布它，以防有人也在寻找这个问题的解决方案.以下是修改后的代码，所有作者-金先生的功劳.

I found a tutorial here but it requires both Secret Key and Public Key to encrypt data. However I've modified the codes a bit to only require public key (no signing, no compress) and thought I should publish it here in case anyone also looking for a solution for this question. Belows is the modified codes, all the credits for the author - Mr. Kim.

public class PgpEncrypt
    {
        private PgpEncryptionKeys m_encryptionKeys;
        private const int BufferSize = 0x10000; 
        /// <summary>
        /// Instantiate a new PgpEncrypt class with initialized PgpEncryptionKeys.
        /// </summary>
        /// <param name="encryptionKeys"></param>
        /// <exception cref="ArgumentNullException">encryptionKeys is null</exception>
        public PgpEncrypt(PgpEncryptionKeys encryptionKeys)
        {
            if (encryptionKeys == null)
            {
                throw new ArgumentNullException("encryptionKeys", "encryptionKeys is null.");
            }
            m_encryptionKeys = encryptionKeys;
        }
        /// <summary>
        /// Encrypt and sign the file pointed to by unencryptedFileInfo and
        /// write the encrypted content to outputStream.
        /// </summary>
        /// <param name="outputStream">The stream that will contain the
        /// encrypted data when this method returns.</param>
        /// <param name="fileName">FileInfo of the file to encrypt</param>
        public void Encrypt(Stream outputStream, FileInfo unencryptedFileInfo)
        {
            if (outputStream == null)
            {
                throw new ArgumentNullException("outputStream", "outputStream is null.");
            }
            if (unencryptedFileInfo == null)
            {
                throw new ArgumentNullException("unencryptedFileInfo", "unencryptedFileInfo is null.");
            }
            if (!File.Exists(unencryptedFileInfo.FullName))
            {
                throw new ArgumentException("File to encrypt not found.");
            }
            using (Stream encryptedOut = ChainEncryptedOut(outputStream))
            {
                using (Stream literalOut = ChainLiteralOut(encryptedOut, unencryptedFileInfo))
                using (FileStream inputFile = unencryptedFileInfo.OpenRead())
                {
                    WriteOutput(literalOut, inputFile);
                }
            }
        }

        private static void WriteOutput(Stream literalOut,
            FileStream inputFile)
        {
            int length = 0;
            byte[] buf = new byte[BufferSize];
            while ((length = inputFile.Read(buf, 0, buf.Length)) > 0)
            {
                literalOut.Write(buf, 0, length);
            }
        }

        private Stream ChainEncryptedOut(Stream outputStream)
        {
            PgpEncryptedDataGenerator encryptedDataGenerator;
            encryptedDataGenerator =
                new PgpEncryptedDataGenerator(SymmetricKeyAlgorithmTag.TripleDes,
                                              new SecureRandom());
            encryptedDataGenerator.AddMethod(m_encryptionKeys.PublicKey);
            return encryptedDataGenerator.Open(outputStream, new byte[BufferSize]);
        }

        private static Stream ChainLiteralOut(Stream encryptedOut, FileInfo file)
        {
            PgpLiteralDataGenerator pgpLiteralDataGenerator = new PgpLiteralDataGenerator();
            return pgpLiteralDataGenerator.Open(encryptedOut, PgpLiteralData.Binary, 

file);
            } 
}

当然要运行这些代码，您必须在项目中包含 BouncyCastle 库.
我已经测试过加密然后解密，它运行良好:)

Of course to run these codes you have to include BouncyCastle library in your project.
I've tested encrypting and then decrypting and it runs fine :)

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