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Esiur/Security/Authority/Certificate.cs
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222
Esiur/Security/Authority/Certificate.cs
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/*
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Copyright (c) 2017 Ahmed Kh. Zamil
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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using Esiur.Data;
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using Esiur.Core;
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using Esiur.Misc;
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using Esiur.Security.Cryptography;
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using Esiur.Security.Integrity;
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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 Esiur.Security.Authority
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{
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public abstract class Certificate
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{
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protected DateTime issueDate, expireDate;
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protected RSA rsa;
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protected Aes aes;
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protected byte[] publicRawData;
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protected byte[] privateRawData;
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protected ulong id;
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protected HashFunctionType hashFunction;
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public Certificate(ulong id, DateTime issueDate, DateTime expireDate, HashFunctionType hashFunction)
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{
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this.id = id;
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this.issueDate = issueDate;
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this.expireDate = expireDate;
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this.hashFunction = hashFunction;
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}
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public ulong Id
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{
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get { return id; }
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}
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public AsymetricEncryptionAlgorithmType AsymetricEncryptionAlgorithm
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{
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get { return AsymetricEncryptionAlgorithmType.RSA; }
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}
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public byte[] AsymetricEncrypt(byte[] message)
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{
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return rsa.Encrypt(message, RSAEncryptionPadding.OaepSHA512);
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}
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public byte[] AsymetricEncrypt(byte[] message, uint offset, uint length)
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{
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if (message.Length != length)
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return rsa.Encrypt(DC.Clip(message, offset, length), RSAEncryptionPadding.OaepSHA512);
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else
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return rsa.Encrypt(message, RSAEncryptionPadding.OaepSHA512);
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}
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public byte[] AsymetricDecrypt(byte[] message)
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{
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try
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{
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return rsa.Decrypt(message, RSAEncryptionPadding.OaepSHA512);
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}
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catch (Exception ex)
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{
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Global.Log("Certificate", LogType.Error, ex.ToString());
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return null;
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}
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}
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public byte[] AsymetricDecrypt(byte[] message, uint offset, uint length)
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{
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try
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{
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if (message.Length != length)
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return rsa.Decrypt(DC.Clip(message, offset, length), RSAEncryptionPadding.OaepSHA512);
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else
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return rsa.Decrypt(message, RSAEncryptionPadding.OaepSHA512);
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}
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catch (Exception ex)
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{
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Global.Log("Certificate", LogType.Error, ex.ToString());
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return null;
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}
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}
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public byte[] SymetricEncrypt(byte[] message, uint offset, uint length)
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{
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byte[] rt = null;
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using (var ms = new MemoryStream())
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{
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using (CryptoStream cs = new CryptoStream(ms, aes.CreateEncryptor(), CryptoStreamMode.Write))
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cs.Write(message, (int)offset, (int)length);
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rt = ms.ToArray();
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}
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return rt;
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}
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public byte[] SymetricEncrypt(byte[] message)
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{
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return SymetricEncrypt(message, 0, (uint)message.Length);
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}
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public byte[] SymetricDecrypt(byte[] message, uint offset, uint length)
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{
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byte[] rt = null;
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using (var ms = new MemoryStream())
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{
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using (CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write))
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cs.Write(message, (int)offset, (int)length);
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rt = ms.ToArray();
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}
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return rt;
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}
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public byte[] SymetricDecrypt(byte[] message)
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{
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return SymetricDecrypt(message, 0, (uint)message.Length);
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}
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public byte[] Sign(byte[] message)
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{
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return Sign(message, 0, (uint)message.Length);
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}
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public byte[] Sign(byte[] message, uint offset, uint length)
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{
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if (hashFunction == HashFunctionType.SHA1)
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return rsa.SignData(message, (int)offset, (int)length, HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
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else if (hashFunction == HashFunctionType.MD5)
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return rsa.SignData(message, (int)offset, (int)length, HashAlgorithmName.MD5, RSASignaturePadding.Pkcs1);
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else if (hashFunction == HashFunctionType.SHA256)
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return rsa.SignData(message, (int)offset, (int)length, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
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else if (hashFunction == HashFunctionType.SHA384)
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return rsa.SignData(message, (int)offset, (int)length, HashAlgorithmName.SHA384, RSASignaturePadding.Pkcs1);
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else if (hashFunction == HashFunctionType.SHA512)
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return rsa.SignData(message, (int)offset, (int)length, HashAlgorithmName.SHA512, RSASignaturePadding.Pkcs1);
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return null;
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}
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public bool InitializeSymetricCipher(SymetricEncryptionAlgorithmType algorithm, int keyLength, byte[] key, byte[] iv)
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{
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if (algorithm == SymetricEncryptionAlgorithmType.AES)
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{
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if (keyLength == 0) // 128 bit
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{
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aes = Aes.Create();
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aes.Mode = CipherMode.CBC;
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aes.Padding = PaddingMode.PKCS7;
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aes.Key = key;
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aes.IV = iv;
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return true;
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}
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}
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return false;
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}
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public abstract bool Save(string filename, bool includePrivate = false);
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public abstract byte[] Serialize(bool includePrivate = false);
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public static Certificate Load(string filename)
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{
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byte[] ar = File.ReadAllBytes(filename);
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var t = (CertificateType)ar[0];
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switch (t)
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{
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case CertificateType.CAPublic:
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return new CACertificate(ar, 1, (uint)ar.Length - 1);
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case CertificateType.CAPrivate:
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return new CACertificate(ar, 1, (uint)ar.Length - 1, true);
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case CertificateType.DomainPublic:
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return new DomainCertificate(ar, 1, (uint)ar.Length - 1);
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case CertificateType.DomainPrivate:
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return new DomainCertificate(ar, 1, (uint)ar.Length - 1, true);
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case CertificateType.UserPublic:
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return new UserCertificate(ar, 1, (uint)ar.Length - 1);
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case CertificateType.UserPrivate:
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return new UserCertificate(ar, 1, (uint)ar.Length - 1, true);
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}
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return null;
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}
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}
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}
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