179 lines
5.4 KiB
C#
179 lines
5.4 KiB
C#
using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.IO;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Security;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace Support.Crypto
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{
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public class AES
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{
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private static string MemoryMasterKey = "!ZEqy2Zsb#VK6<8`H6;W~VxJ$r:w.{ffzwDt=<yKC6m6N3;T<9nyeF&+.4&D@rhK";
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public const string PGS_ENCRYPT_PARTIAL_KEY = "wA6j@x.CcmM>~5Ss^C_!#,zch)$YsDsd59,::>dW#F`@U]Ye5ETZcMT7}&+#*!%z";
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public static string Encrypt(string value, byte[] deriveKey = null)
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{
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string result = null;
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try
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{
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byte[] keyBytes = deriveKey;
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if (deriveKey == null)
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{
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keyBytes = GetKey(MemoryMasterKey);
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}
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IBufferedCipher encCipher = CipherUtilities.GetCipher("AES/GCM/NoPadding");
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KeyParameter key = new KeyParameter(keyBytes);
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byte[] nonce = new byte[12];
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RandomNumberGenerator.Create().GetBytes(nonce);
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encCipher.Init(true, new ParametersWithIV(key, nonce));
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byte[] plainText = Encoding.UTF8.GetBytes(value);
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byte[] chiperBuffer = null;
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byte[] tag = new byte[16];
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byte[] resultBuffer = null;
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using (MemoryStream memStream = new MemoryStream())
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{
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using (CipherStream encStream = new CipherStream(memStream, null, encCipher))
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{
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encStream.Write(plainText, 0, plainText.Length);
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}
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chiperBuffer = memStream.ToArray();
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resultBuffer = nonce.Concat(chiperBuffer).ToArray();
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}
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result = Convert.ToBase64String(resultBuffer);
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}
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catch
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{
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result = null;
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}
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return result;
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}
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public static string Decrypt(string value, byte[] deriveKey = null)
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{
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string result = null;
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try
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{
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byte[] keyBytes = deriveKey;
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if (deriveKey == null)
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{
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keyBytes = GetKey(MemoryMasterKey);
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}
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IBufferedCipher decCipher = CipherUtilities.GetCipher("AES/GCM/NoPadding");
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KeyParameter key = new KeyParameter(keyBytes);
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byte[] combined = Convert.FromBase64String(value);
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byte[] tag = combined.Skip(combined.Length - 16).ToArray();
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byte[] nonce = combined.Take(12).ToArray();
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byte[] chiperText = combined.Skip(nonce.Length).Take(combined.Length - nonce.Length).ToArray();
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byte[] plainTextBuffer = null;
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decCipher.Init(false, new ParametersWithIV(key, nonce));
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using (MemoryStream memStream = new MemoryStream(chiperText, false))
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{
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MemoryStream dataStream = new MemoryStream();
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using (dataStream)
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{
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using (CipherStream decStream = new CipherStream(memStream, (IBufferedCipher)decCipher, null))
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{
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int ch;
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while ((ch = decStream.ReadByte()) >= 0)
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{
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dataStream.WriteByte((byte)ch);
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}
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}
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}
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plainTextBuffer = dataStream.ToArray();
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result = Encoding.UTF8.GetString(plainTextBuffer);
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}
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}
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catch
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{
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result = null;
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}
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return result;
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}
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public static byte[] GetKey(string password)
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{
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byte[] result = null;
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try
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{
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if (!string.IsNullOrEmpty(password))
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{
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if (password.Length < 32)
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{
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password = password.PadRight(32, '@');
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}
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else if (password.Length > 32)
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{
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password = MD5Encrypt(password);
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}
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result = Encoding.ASCII.GetBytes(password);
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}
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}
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catch (Exception ex)
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{
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}
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return result;
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}
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public static string MD5Encrypt(string value)
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{
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string result = null;
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try
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{
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byte[] bytes = Encoding.UTF8.GetBytes(value);
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using (System.Security.Cryptography.MD5 hash = System.Security.Cryptography.MD5.Create())
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{
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byte[] hashedInputBytes = hash.ComputeHash(bytes);
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StringBuilder hashedInputStringBuilder = new StringBuilder(128);
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foreach (var b in hashedInputBytes)
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{
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hashedInputStringBuilder.Append(b.ToString("X2"));
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}
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result = hashedInputStringBuilder.ToString().ToLower();
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}
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}
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catch
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{
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result = null;
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}
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return result;
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}
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}
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}
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