95 lines
3.6 KiB
C#
95 lines
3.6 KiB
C#
// ***********************************************************************
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// <copyright file="RsaHelper.cs">
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// AgileWebs
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// </copyright>
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// ***********************************************************************
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.OpenSsl;
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using Org.BouncyCastle.Security;
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using System.Security.Cryptography;
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using System.Text;
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namespace Core.Thalos.BuildingBlocks
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{
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/// <summary>
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/// Handles all methods related to RSA encryption"/>.
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/// </summary>
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public class RsaHelper
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{
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private readonly RSACryptoServiceProvider _privateKey;
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private readonly RSACryptoServiceProvider _publicKey;
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private readonly string keysFolder = "Keys\\";
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private readonly string exeDirectory = AppContext.BaseDirectory;
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/// <summary>
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/// Initializes a new instance of <see cref="RsaHelper"/>.
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/// </summary>
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public RsaHelper()
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{
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exeDirectory = exeDirectory + keysFolder;
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_publicKey = GetPublicKeyFromPemFile();
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_privateKey = GetPrivateKeyFromPemFile();
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}
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/// <summary>
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/// Encrypts a text using RSA algorithm.
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/// </summary>
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/// <param name="text">The text to be encrypted.</param>
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/// <returns>The encrypted text.</returns>
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public string Encrypt(string text)
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{
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byte[] dataBytes = Encoding.UTF8.GetBytes(text);
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var encryptedBytes = _publicKey.Encrypt(Encoding.UTF8.GetBytes(text), true);
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return Convert.ToBase64String(encryptedBytes);
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}
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/// <summary>
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/// Decrypts a text using RSA algorithm.
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/// </summary>
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/// <param name="text">The encrypted text to be decrypted.</param>
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/// <returns>The decrypted text.</returns>
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public string Decrypt(string encrypted)
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{
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var decryptedBytes = _privateKey.Decrypt(Convert.FromBase64String(encrypted), true);
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return Encoding.UTF8.GetString(decryptedBytes, 0, decryptedBytes.Length);
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}
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/// <summary>
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///Obtains the private key from a file.
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/// </summary>
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/// <returns>The private key.</returns>
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private RSACryptoServiceProvider GetPrivateKeyFromPemFile()
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{
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using (TextReader privateKeyTextReader = new StringReader(File.ReadAllText(Path.Combine(exeDirectory, "PrivateKey.pem"))))
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{
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AsymmetricCipherKeyPair readKeyPair = (AsymmetricCipherKeyPair)new PemReader(privateKeyTextReader).ReadObject();
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RSAParameters rsaParams = DotNetUtilities.ToRSAParameters((RsaPrivateCrtKeyParameters)readKeyPair.Private);
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RSACryptoServiceProvider csp = new RSACryptoServiceProvider();
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csp.ImportParameters(rsaParams);
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return csp;
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}
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}
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/// <summary>
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///Obtains the public key from a file.
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/// </summary>
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/// <returns>The public key.</returns>
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public RSACryptoServiceProvider GetPublicKeyFromPemFile()
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{
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using (TextReader publicKeyTextReader = new StringReader(File.ReadAllText(Path.Combine(exeDirectory, "PublicKey.pem"))))
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{
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RsaKeyParameters publicKeyParam = (RsaKeyParameters)new PemReader(publicKeyTextReader).ReadObject();
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RSAParameters rsaParams = DotNetUtilities.ToRSAParameters((RsaKeyParameters)publicKeyParam);
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RSACryptoServiceProvider csp = new RSACryptoServiceProvider();
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csp.ImportParameters(rsaParams);
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return csp;
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}
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}
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}
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}
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