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C#在using System.Security.Cryptography下有 DESCryptoServiceProvider RSACryptoServiceProvider?
DESCryptoServiceProvider 是用于对称加密 RSACryptoServiceProvider是用于非对称加密?
对称加密的意思：有一个密钥 相当于加密算法，加密用它来加密，解密也需要用到它。因为加密解密都是用同一个密钥所以叫对称加密。 对称加密有一个坏处只要拥有密钥的人都可以解密。?
非对称加密：就是有2个密钥，一个是公钥，一个是私钥，私钥是自己的，不能随便给人，公钥随便给，无所谓。一般是别人用你的公钥加密，然后把密文给你，你用你的私钥解密，这样一样加密和解密不是同一个密钥，所以叫非对称。
1.rsa
/// <summary>
/// 获取加密所使用的key，RSA算法是一种非对称密码算法，所谓非对称，就是指该算法需要一对密钥，使用其中一个加密，则需要用另一个才能解密。
/// </summary>
public static void GetKey(ref string PublicKey ,fer stringPrivateKey )
{
string PublicKey = string.Empty;
string PrivateKey = string.Empty;
RSACryptoServiceProvider rSACryptoServiceProvider = new RSACryptoServiceProvider();
PublicKey = rSACryptoServiceProvider.ToXmlString(false); // 获取公钥，用于加密
PrivateKey = rSACryptoServiceProvider.ToXmlString(true); // 私匙，
用于解密
}
?/// <summary>
? ? ? ? /// RSA加密
? ? ? ? /// </summary>
? ? ? ? /// <param name="publickey">公钥</param>
? ? ? ? /// <param name="content">要加密的内容</param>
? ? ? ? /// <returns>加密后的内容</returns>
? ? ? ? public static string RSAEncrypt(string publickey, string content)
? ? ? ? {
? ? ? ? ? ? RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
? ? ? ? ? ? byte[] cipherbytes;
? ? ? ? ? ? rsa.FromXmlString(publickey);
? ? ? ? ? ? cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
? ? ? ? ? ? return Convert.ToBase64String(cipherbytes);
? ? ? ? }
?/// <summary>
? ? ? ? /// RSA解密
? ? ? ? /// </summary>
? ? ? ? /// <param name="privatekey">私钥</param>
? ? ? ? /// <param name="content">要解密的内容</param>
? ? ? ? /// <returns>解密后的内容</returns>
? ? ? ? public static string RSADecrypt(string privatekey, string content)
? ? ? ? {
? ? ? ? ? ? RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
? ? ? ? ? ? byte[] cipherbytes;
? ? ? ? ? ? rsa.FromXmlString(privatekey);
? ? ? ? ? ? cipherbytes = rsa.Decrypt(Convert.FromBase64String(content), false);
? ? ? ? ? ? return Encoding.UTF8.GetString(cipherbytes);
? ? ? ? }
2.DES
/// <summary>
/// DES加密/解密
/// </summary>
/// <param name="data">加密/解密数据</param>
/// <param name="key">秘钥</param>
/// <param name="keyIV">向量</param>
/// <param name="isEncrypt">true加密，false解密</param>
/// <returns></returns>
public static byte[] EncryptOrDecrypt(byte[] data, byte[] key, byte[] keyIV, bool isEncrypt)
{
DESCryptoServiceProvider desP = new DESCryptoServiceProvider();
if (isEncrypt)// 加密
{
desP.Key = key;
desP.IV = keyIV;
ICryptoTransform desencrypt = desP.CreateEncryptor(key, keyIV);
byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
return result;
}
else // 解密
{
desP.Key = key;
desP.IV = keyIV;
ICryptoTransform desencrypt = desP.CreateDecryptor(key, keyIV);
byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
return result;
}
}
/// <summary>
/// 创建随机秘钥
/// </summary>
/// <returns></returns>
public static byte[] CreateKey()
{
DESCryptoServiceProvider desP = new DESCryptoServiceProvider();
desP.GenerateKey();
return desP.Key;
}
/// <summary>
/// 创建随机向量
/// </summary>
/// <returns></returns>
public static byte[] CreateIV()
{
DESCryptoServiceProvider desP = new DESCryptoServiceProvider();
desP.GenerateIV();
return desP.IV;
}
注：自己做的项目时? 是自己创建自己的 公钥和私钥? ? ?当对接别人项目时? 或许别人给你的是PEM文件? ?格式? ? ? -----BEGIN PUBLIC KEY-----? ? ?公钥的
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? -------------------
? ? ? ? ? ? ? ? ? ? ? ? ? ? ?-----END PUBLIC KEY-----? ? ?
需要提取其中的公钥
/// <summary>
?? ??? ?/// 用PEM格式密钥对创建RSA，支持PKCS#1、PKCS#8格式的PEM
?? ??? ?/// 出错将会抛出异常
?? ??? ?/// </summary>
?? ??? ?/// <param name="pem">读出的pen文本</param>
?? ??? ?/// <returns>返回公钥文本</returns>
?? ??? ?static public RSA_PEM FromPEM(string pem)
?? ??? ?{
?? ??? ??? ?RSA_PEM param = new RSA_PEM();
?? ??? ??? ?var base64 = _PEMCode.Replace(pem, "");
?? ??? ??? ?byte[] data = null;
?? ??? ??? ?try { data = Convert.FromBase64String(base64); } catch { }
?? ??? ??? ?if (data == null)
?? ??? ??? ?{
?? ??? ??? ??? ?throw new Exception("PEM内容无效");
?? ??? ??? ?}
?? ??? ??? ?var idx = 0;
?? ??? ??? ?//读取长度
?? ??? ??? ?Func<byte, int> readLen = (first) => {
?? ??? ??? ??? ?if (data[idx] == first)
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?idx++;
?? ??? ??? ??? ??? ?if (data[idx] == 0x81)
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ?idx++;
?? ??? ??? ??? ??? ??? ?return data[idx++];
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?else if (data[idx] == 0x82)
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ?idx++;
?? ??? ??? ??? ??? ??? ?return (((int)data[idx++]) << 8) + data[idx++];
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?else if (data[idx] < 0x80)
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ?return data[idx++];
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ??? ?throw new Exception("PEM未能提取到数据");
?? ??? ??? ?};
?? ??? ??? ?//读取块数据
?? ??? ??? ?Func<byte[]> readBlock = () => {
?? ??? ??? ??? ?var len = readLen(0x02);
?? ??? ??? ??? ?if (data[idx] == 0x00)
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?idx++;
?? ??? ??? ??? ??? ?len--;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?var val = new byte[len];
?? ??? ??? ??? ?for (var i = 0; i < len; i++)
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?val[i] = data[idx + i];
?? ??? ??? ??? ?}
?? ??? ??? ??? ?idx += len;
?? ??? ??? ??? ?return val;
?? ??? ??? ?};
?? ??? ??? ?//比较data从idx位置开始是否是byts内容
?? ??? ??? ?Func<byte[], bool> eq = (byts) => {
?? ??? ??? ??? ?for (var i = 0; i < byts.Length; i++, idx++)
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?if (idx >= data.Length)
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ?return false;
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?if (byts[i] != data[idx])
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ?return false;
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ??? ?return true;
?? ??? ??? ?};
?? ??? ??? ?if (pem.Contains("PUBLIC KEY"))
?? ??? ??? ?{
?? ??? ??? ??? ?/****使用公钥****/
?? ??? ??? ??? ?//读取数据总长度
?? ??? ??? ??? ?readLen(0x30);
?? ??? ??? ??? ?//检测PKCS8
?? ??? ??? ??? ?var idx2 = idx;
?? ??? ??? ??? ?if (eq(_SeqOID))
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?//读取1长度
?? ??? ??? ??? ??? ?readLen(0x03);
?? ??? ??? ??? ??? ?idx++;//跳过0x00
?? ??? ??? ??? ??? ??? ? ?//读取2长度
?? ??? ??? ??? ??? ?readLen(0x30);
?? ??? ??? ??? ?}
?? ??? ??? ??? ?else
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?idx = idx2;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?//Modulus
?? ??? ??? ??? ?param.Key_Modulus = readBlock();
?? ??? ??? ??? ?//Exponent
?? ??? ??? ??? ?param.Key_Exponent = readBlock();
?? ??? ??? ?}
?? ??? ??? ?else if (pem.Contains("PRIVATE KEY"))
?? ??? ??? ?{
?? ??? ??? ??? ?/****使用私钥****/
?? ??? ??? ??? ?//读取数据总长度
?? ??? ??? ??? ?readLen(0x30);
?? ??? ??? ??? ?//读取版本号
?? ??? ??? ??? ?if (!eq(_Ver))
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?throw new Exception("PEM未知版本");
?? ??? ??? ??? ?}
?? ??? ??? ??? ?//检测PKCS8
?? ??? ??? ??? ?var idx2 = idx;
?? ??? ??? ??? ?if (eq(_SeqOID))
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?//读取1长度
?? ??? ??? ??? ??? ?readLen(0x04);
?? ??? ??? ??? ??? ?//读取2长度
?? ??? ??? ??? ??? ?readLen(0x30);
?? ??? ??? ??? ??? ?//读取版本号
?? ??? ??? ??? ??? ?if (!eq(_Ver))
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ?throw new Exception("PEM版本无效");
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ??? ?else
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?idx = idx2;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?//读取数据
?? ??? ??? ??? ?param.Key_Modulus = readBlock();
?? ??? ??? ??? ?param.Key_Exponent = readBlock();
?? ??? ??? ??? ?int keyLen = param.Key_Modulus.Length;
?? ??? ??? ??? ?param.Key_D = BigL(readBlock(), keyLen);
?? ??? ??? ??? ?keyLen = keyLen / 2;
?? ??? ??? ??? ?param.Val_P = BigL(readBlock(), keyLen);
?? ??? ??? ??? ?param.Val_Q = BigL(readBlock(), keyLen);
?? ??? ??? ??? ?param.Val_DP = BigL(readBlock(), keyLen);
?? ??? ??? ??? ?param.Val_DQ = BigL(readBlock(), keyLen);
?? ??? ??? ??? ?param.Val_InverseQ = BigL(readBlock(), keyLen);
?? ??? ??? ?}
?? ??? ??? ?else
?? ??? ??? ?{
?? ??? ??? ??? ?throw new Exception("pem需要BEGIN END标头");
?? ??? ??? ?}
?? ??? ??? ?return param;
?? ??? ?}
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