99 lines
3.2 KiB
C#
99 lines
3.2 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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namespace TightWiki.Security
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{
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public static class Helpers
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{
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private static string? _machineKey;
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public static string MachineKey
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=> _machineKey ??= Sha1(Environment.MachineName);
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public static string GenerateRandomString(int maxLength = 10)
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{
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using var crypto = Aes.Create();
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crypto.GenerateKey();
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var result = Convert.ToBase64String(crypto.Key).Replace("/", "").Replace("=", "").Replace("+", "");
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if (result.Length > maxLength)
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{
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result = result.Substring(0, maxLength);
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}
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return result.ToUpper();
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}
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public static int Crc32(string text)
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=> (int)(new Crc32()).Get(Encoding.Unicode.GetBytes(text));
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public static int Crc32(byte[] bytes)
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=> (int)(new Crc32()).Get(bytes);
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public static string Sha1(string text)
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=> BitConverter.ToString(SHA1.HashData(Encoding.Unicode.GetBytes(text))).Replace("-", "");
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public static string Sha256(string value)
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{
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var hash = new StringBuilder();
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byte[] crypto = SHA256.HashData(Encoding.UTF8.GetBytes(value));
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foreach (byte theByte in crypto)
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{
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hash.Append(theByte.ToString("x2"));
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}
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return hash.ToString();
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}
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public static string EncryptString(string key, string plainText)
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{
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using var aes = Aes.Create();
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byte[] iv = new byte[16];
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byte[] keyBytes = SHA256.HashData(Encoding.Unicode.GetBytes(key));
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byte[] vector = (byte[])keyBytes.Clone();
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for (int i = 0; i < 16; i++)
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{
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iv[i] = vector[i];
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}
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aes.Key = keyBytes;
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aes.IV = iv;
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var encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
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using var memoryStream = new MemoryStream();
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using var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
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using (var streamWriter = new StreamWriter(cryptoStream))
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{
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streamWriter.Write(plainText);
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}
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return Convert.ToBase64String(memoryStream.ToArray());
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}
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public static string DecryptString(string key, string cipherText)
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{
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byte[] buffer = Convert.FromBase64String(cipherText);
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using var aes = Aes.Create();
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byte[] iv = new byte[16];
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byte[] keyBytes = SHA256.HashData(Encoding.Unicode.GetBytes(key));
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byte[] vector = (byte[])keyBytes.Clone();
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for (int i = 0; i < 16; i++)
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{
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iv[i] = vector[i];
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}
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aes.Key = keyBytes;
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aes.IV = iv;
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var cryptoTransform = aes.CreateDecryptor(aes.Key, aes.IV);
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using var memoryStream = new MemoryStream(buffer);
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using var cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Read);
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using var streamReader = new StreamReader(cryptoStream);
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return streamReader.ReadToEnd();
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}
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}
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}
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