mirror of
https://dev.azure.com/TeilRad/sharee.bike%20App/_git/Code
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88 lines
2.7 KiB
C#
88 lines
2.7 KiB
C#
using System;
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using System.IO;
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using System.Security.Cryptography;
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using TINK.Model.Device;
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namespace TINK.Services.BluetoothLock.Crypto
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{
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public class Cipher : ICipher
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{
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/// <summary> Decrypt data. </summary>
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/// <remarks>
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/// Further info see:
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/// https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.aes?view=netcore-3.1 for further info
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// https://docs.microsoft.com/en-us/dotnet/standard/security/cryptographic-services
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// https://stackoverflow.com/questions/24903575/how-to-return-byte-when-decrypt-using-cryptostream-descryptoserviceprovider/24903689
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/// </remarks>
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/// <param name="key">Key to decrypt data with.</param>
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/// <param name="encrypted">Encrpyted data to decrypt.</param>
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/// <returns>Decrypted data.</returns>
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public byte[] Decrypt(byte[] key, byte[] encrypted)
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{
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// Check arguments.
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if (encrypted == null || encrypted.Length <= 0)
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throw new ArgumentNullException(nameof(encrypted));
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if (key == null || key.Length <= 0)
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throw new ArgumentNullException(nameof(key));
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using (Aes aesAlg = Aes.Create())
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{
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aesAlg.KeySize = 192;
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aesAlg.Mode = CipherMode.ECB;
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aesAlg.Padding = PaddingMode.None;
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aesAlg.Key = key;
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// Create a decryptor to perform the stream transform.
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ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
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// Create the streams used for decryption.
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using (var msDecrypt = new MemoryStream())
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{
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using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Write))
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{
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csDecrypt.Write(encrypted, 0, encrypted.Length);
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csDecrypt.FlushFinalBlock();
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return msDecrypt.ToArray();
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}
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}
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}
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}
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public byte[] Encrypt(byte[] key, byte[] clear)
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{
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// Check arguments.
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if (clear == null || clear.Length <= 0)
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throw new ArgumentNullException("plainText");
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if (key == null || key.Length <= 0)
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throw new ArgumentNullException("Key");
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// Create an AesCryptoServiceProvider object
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// with the specified key and IV.
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using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
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{
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aesAlg.KeySize = 192;
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aesAlg.Mode = CipherMode.ECB;
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aesAlg.Padding = PaddingMode.None;
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aesAlg.Key = key;
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// Create an encryptor to perform the stream transform.
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ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
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// Create the streams used for encryption.
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using (var msEncrypt = new MemoryStream())
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{
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using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
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{
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csEncrypt.Write(clear, 0, clear.Length);
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csEncrypt.FlushFinalBlock();
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return msEncrypt.ToArray();
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}
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}
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}
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}
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}
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}
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