软件注册码随笔
用到的是：BouncyCastle.Crypto.dll类库
官网：http://www.bouncycastle.org/csharp/
生成密钥对
RsaKeyPairGenerator keyGenerator = new RsaKeyPairGenerator(); //密钥构造器 RsaKeyGenerationParameters p = new RsaKeyGenerationParameters(BigInteger.ValueOf(3), new SecureRandom(), 1024, 25); //初始化密钥构造器 keyGenerator.Init(p); //密钥对 AsymmetricCipherKeyPair keyPair = keyGenerator.GenerateKeyPair(); //公钥和私钥 AsymmetricKeyParameter publicKey = keyPair.Public; AsymmetricKeyParameter privateKey = keyPair.Private;
保存密钥对到文件（我这里用*.key形式保存的，当然也可以用其它的）
1 private static void SavePublicKey(AsymmetricKeyParameter publicKey) 2 { 3 SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(publicKey); 4 Asn1Object ao = publicKeyInfo.ToAsn1Object(); 5 byte[] publicKeyByte = ao.GetEncoded(); 6 FileStream fs = new FileStream(@"D:\public.key", FileMode.Create, FileAccess.Write); 7 fs.Write(publicKeyByte, 0, publicKeyByte.Length); 8 fs.Close(); 9 }
1 private static void SavePrivateKey(AsymmetricKeyParameter privateKey) 2 { 3 PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKey); 4 Asn1Object ao = privateKeyInfo.ToAsn1Object(); 5 byte[] privateKeyByte = ao.GetEncoded(); 6 FileStream fs = new FileStream(@"D:\private.key", FileMode.Create, FileAccess.Write); 7 fs.Write(privateKeyByte, 0, privateKeyByte.Length); 8 fs.Close(); 9 }
软件注册基本结构：
自己拥有私密：privatekey
客户拥有公密：publicKey
1：客户端生成序列号
2：客户把序列号告诉私密拥有者
3：私密拥有者用私钥加密信息（时间，版本，或者什么的）
4：加密后的信息给客户，客户在软件操作，验证
1，2步骤不用说了，很简单
直接3，4步骤
私密加密
1 IAsymmetricBlockCipher enginePrivate = new RsaEngine(); 2 Asn1Object aobj = Asn1Object.FromStream(new FileStream(@"D:\private.key", FileMode.Open, FileAccess.Read)); 3 PrivateKeyInfo priKey = PrivateKeyInfo.GetInstance(aobj); 4 AsymmetricKeyParameter privateKey = PrivateKeyFactory.CreateKey(priKey); 5 enginePrivate.Init(true, privateKey); 6 byte[] enData = enginePrivate.ProcessBlock(data1, 0, data1.Length); 7 string tempEnString = ConvertBytesToHexString(enData);
公密解密
1 byte[] data = ConvertHexStringToBytes(tempEnString); 2 IAsymmetricBlockCipher engine = new RsaEngine(); 3 Asn1Object aobject = Asn1Object.FromStream(new FileStream(@"D:\public.key", FileMode.Open, FileAccess.Read)); //a.puk?? 4 SubjectPublicKeyInfo pubInfo = SubjectPublicKeyInfo.GetInstance(aobject); 5 AsymmetricKeyParameter publicKey = (RsaKeyParameters)PublicKeyFactory.CreateKey(pubInfo); 6 engine.Init(false, publicKey); 7 engine.GetInputBlockSize(); 8 byte[] deData = engine.ProcessBlock(data, 0, data.Length); 9 string tempString = byteToHexStr(deData);
帮助类
private string byteToHexStr(byte[] bytes) { string returnStr = ""; if (bytes != null) { for (int i = 0; i < bytes.Length; i++) { returnStr += bytes[i].ToString("X2"); } } return returnStr; } public byte[] ConvertHexStringToBytes(string hexString) { int len = hexString.Length / 2; byte[] bytes = new byte[len]; for (int i = 0; i < len; i++) { bytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16); } return bytes; } public string ConvertBytesToHexString(byte[] bytes) { StringBuilder sb = new StringBuilder(); foreach (byte b in bytes) { sb.Append(string.Format("{0:X2}", b).PadLeft(2, '0')); } return sb.ToString(); }
直接看代码，有些东西是自己要研究的，
