石家庄手机网站制作,昆明网站策划,个人网站模板儿童,阳江房产网签一. MD5 1 防止看到明文 数据库密码#xff0c;加盐(原密码固定字符串#xff0c;然后再MD5/双MD5) 2 防篡改 3 急速秒传(第一次上传文件#xff0c;保存md5摘要#xff0c;第二次上传检查md5摘要) 4文件下载(防篡改#xff0c;官方发布的时候给一个md5摘要#xf… 一. MD5 1 防止看到明文 数据库密码加盐(原密码固定字符串然后再MD5/双MD5) 2 防篡改 3 急速秒传(第一次上传文件保存md5摘要第二次上传检查md5摘要) 4文件下载(防篡改官方发布的时候给一个md5摘要安装的时候首先检查下摘要) 5 svn TFS git VSS(本地保存文件的md5摘要任何修改都会影响md5) 1 public class MD5Encrypt2 {3 #region MD54 /// summary5 /// MD5加密,和动网上的16/32位MD5加密结果相同,6 /// 使用的UTF8编码7 /// /summary8 /// param namesource待加密字串/param9 /// param namelength16或32值之一,其它则采用.net默认MD5加密算法/param
10 /// returns加密后的字串/returns
11 public static string Encrypt(string source, int length 32)//默认参数
12 {
13 if (string.IsNullOrEmpty(source)) return string.Empty;
14 HashAlgorithm provider CryptoConfig.CreateFromName(MD5) as HashAlgorithm;
15 byte[] bytes Encoding.UTF8.GetBytes(source);//这里需要区别编码的
16 byte[] hashValue provider.ComputeHash(bytes);
17 StringBuilder sb new StringBuilder();
18 switch (length)
19 {
20 case 16://16位密文是32位密文的9到24位字符
21 for (int i 4; i 12; i)
22 {
23 sb.Append(hashValue[i].ToString(x2));
24 }
25 break;
26 case 32:
27 for (int i 0; i 16; i)
28 {
29 sb.Append(hashValue[i].ToString(x2));
30 }
31 break;
32 default:
33 for (int i 0; i hashValue.Length; i)
34 {
35 sb.Append(hashValue[i].ToString(x2));
36 }
37 break;
38 }
39 return sb.ToString();
40 }
41 #endregion MD5
42
43 #region MD5摘要
44 /// summary
45 /// 获取文件的MD5摘要
46 /// /summary
47 /// param namefileName/param
48 /// returns/returns
49 public static string AbstractFile(string fileName)
50 {
51 using (FileStream file new FileStream(fileName, FileMode.Open))
52 {
53 return AbstractFile(file);
54 }
55 }
56
57 /// summary
58 /// 根据stream获取文件摘要
59 /// /summary
60 /// param namestream/param
61 /// returns/returns
62 public static string AbstractFile(Stream stream)
63 {
64 MD5 md5 new MD5CryptoServiceProvider();
65 byte[] retVal md5.ComputeHash(stream);
66
67 StringBuilder sb new StringBuilder();
68 for (int i 0; i retVal.Length; i)
69 {
70 sb.Append(retVal[i].ToString(x2));
71 }
72 return sb.ToString();
73 }
74 #endregion
75 } View Code 二 . DES可逆对称加密 1 /// summary2 /// DES AES Blowfish3 /// 对称加密算法的优点是速度快4 /// 缺点是密钥管理不方便要求共享密钥。5 /// 可逆对称加密 密钥长度86 /// /summary7 public class DesEncrypt8 {9 private static byte[] _rgbKey ASCIIEncoding.ASCII.GetBytes(key));
10 private static byte[] _rgbIV ASCIIEncoding.ASCII.GetBytes(value);
11
12 /// summary
13 /// DES 加密
14 /// /summary
15 /// param nametext需要加密的值/param
16 /// returns加密后的结果/returns
17 public static string Encrypt(string text)
18 {
19 DESCryptoServiceProvider dsp new DESCryptoServiceProvider();
20 using (MemoryStream memStream new MemoryStream())
21 {
22 CryptoStream crypStream new CryptoStream(memStream, dsp.CreateEncryptor(_rgbKey, _rgbIV), CryptoStreamMode.Write);
23 StreamWriter sWriter new StreamWriter(crypStream);
24 sWriter.Write(text);
25 sWriter.Flush();
26 crypStream.FlushFinalBlock();
27 memStream.Flush();
28 return Convert.ToBase64String(memStream.GetBuffer(), 0, (int)memStream.Length);
29 }
30 }
31
32 /// summary
33 /// DES解密
34 /// /summary
35 /// param nameencryptText/param
36 /// returns解密后的结果/returns
37 public static string Decrypt(string encryptText)
38 {
39 DESCryptoServiceProvider dsp new DESCryptoServiceProvider();
40 byte[] buffer Convert.FromBase64String(encryptText);
41
42 using (MemoryStream memStream new MemoryStream())
43 {
44 CryptoStream crypStream new CryptoStream(memStream, dsp.CreateDecryptor(_rgbKey, _rgbIV), CryptoStreamMode.Write);
45 crypStream.Write(buffer, 0, buffer.Length);
46 crypStream.FlushFinalBlock();
47 return ASCIIEncoding.UTF8.GetString(memStream.ToArray());
48 }
49 }
50 } View Code 三 RSA可逆非对称加密 1 /// summary2 /// RSA ECC3 /// 可逆非对称加密 4 /// 非对称加密算法的优点是密钥管理很方便缺点是速度慢。5 /// /summary6 public class RsaEncrypt7 {8 /// summary9 /// 获取加密/解密对
10 /// 给你一个是无法推算出另外一个的
11 ///
12 /// Encrypt Decrypt
13 /// /summary
14 /// returnsEncrypt Decrypt/returns
15 public static KeyValuePairstring, string GetKeyPair()
16 {
17 RSACryptoServiceProvider RSA new RSACryptoServiceProvider();
18 string publicKey RSA.ToXmlString(false);
19 string privateKey RSA.ToXmlString(true);
20 return new KeyValuePairstring, string(publicKey, privateKey);
21 }
22
23 /// summary
24 /// 加密内容加密key
25 /// /summary
26 /// param namecontent/param
27 /// param nameencryptKey加密key/param
28 /// returns/returns
29 public static string Encrypt(string content, string encryptKey)
30 {
31 RSACryptoServiceProvider rsa new RSACryptoServiceProvider();
32 rsa.FromXmlString(encryptKey);
33 UnicodeEncoding ByteConverter new UnicodeEncoding();
34 byte[] DataToEncrypt ByteConverter.GetBytes(content);
35 byte[] resultBytes rsa.Encrypt(DataToEncrypt, false);
36 return Convert.ToBase64String(resultBytes);
37 }
38
39 /// summary
40 /// 解密 内容解密key
41 /// /summary
42 /// param namecontent/param
43 /// param namedecryptKey解密key/param
44 /// returns/returns
45 public static string Decrypt(string content, string decryptKey)
46 {
47 byte[] dataToDecrypt Convert.FromBase64String(content);
48 RSACryptoServiceProvider RSA new RSACryptoServiceProvider();
49 RSA.FromXmlString(decryptKey);
50 byte[] resultBytes RSA.Decrypt(dataToDecrypt, false);
51 UnicodeEncoding ByteConverter new UnicodeEncoding();
52 return ByteConverter.GetString(resultBytes);
53 }
54
55
56 /// summary
57 /// 可以合并在一起的每次产生一组新的密钥
58 /// /summary
59 /// param namecontent/param
60 /// param nameencryptKey加密key/param
61 /// param namedecryptKey解密key/param
62 /// returns加密后结果/returns
63 private static string Encrypt(string content, out string publicKey, out string privateKey)
64 {
65 RSACryptoServiceProvider rsaProvider new RSACryptoServiceProvider();
66 publicKey rsaProvider.ToXmlString(false);
67 privateKey rsaProvider.ToXmlString(true);
68
69 UnicodeEncoding ByteConverter new UnicodeEncoding();
70 byte[] DataToEncrypt ByteConverter.GetBytes(content);
71 byte[] resultBytes rsaProvider.Encrypt(DataToEncrypt, false);
72 return Convert.ToBase64String(resultBytes);
73 } View Code 转载于:https://www.cnblogs.com/saodiseng2015/p/9296639.html
