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本文是利用一个简单的小例子，简述C#中和加密术有关的内容，仅供学习参考用。 概述随着信息技术的发展，计算机网络为信息的获取、传输、处理、利用与共享提供了一个高效、快捷、安全的通信环境和传输通道，网络信息安全也变得越来越重要。信息安全主要包括两个方面的内容：信息存储安全和信息传输安全。保证网络中信息安全的主要技术是数据的加密与解密。如下图示，说明了加密与解密的过程。
公式算法表示如下： 加密公式：c=Eke(m) （11.1） 解密公式：m=Dkd(c) （11.2）其中m代表明文，c代表密文，E是加密算法，D是解密算法，参数ke称为加密密钥，参数kd称为解密密钥 涉及知识点
散列算法散列算法主要有MD5【Message Digest Algorithm】，RIPEMD160【RACE Integrity Primitives Evaluation Message Digest】和SHA【Secure Hash Algorithm】，SHA又分为SHA1，SHA256，SHA384，SHA512，【散列算法不可逆，是单向操作】如下如所示：
关于散列算法，效果图如下：
HASH算法核心代码如下： 1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Security.Cryptography;
5 using System.Text;
6 using System.Threading.Tasks;
7
8 namespace DemoCrtpto
9 {
10 /// <summary>
11 /// 信息摘要帮助类
12 /// </summary>
13 public class HashHelper
14 {
15 #region 信息摘要
16
17 /// <summary>
18 /// MD5信息摘要
19 /// </summary>
20 /// <param name="source"></param>
21 /// <returns></returns>
22 public static string GetInfoByMd5(string source)
23 {
24 HashAlgorithm hash = getHashAlgorithm(HashType.MD5);
25 return Encrypto(hash, source);
26 }
27
28 public static string GetInfoBySHA1(string source)
29 {
30 HashAlgorithm hash = getHashAlgorithm(HashType.SHA1);
31 return Encrypto(hash, source);
32 }
33
34 public static string GetInfoBySHA256(string source)
35 {
36 HashAlgorithm hash = getHashAlgorithm(HashType.SHA256);
37 return Encrypto(hash, source);
38 }
39
40 public static string GetInfoBySHA384(string source)
41 {
42 HashAlgorithm hash = getHashAlgorithm(HashType.SHA384);
43 return Encrypto(hash, source);
44 }
45
46 public static string GetInfoBySHA512(string source)
47 {
48 HashAlgorithm hash = getHashAlgorithm(HashType.SHA512);
49 return Encrypto(hash, source);
50 }
51
52 public static string GetInfoByRipeMD(string source)
53 {
54 HashAlgorithm hash = getHashAlgorithm(HashType.RIPEMD);
55 return Encrypto(hash, source);
56 }
57
58 #endregion
59
60 /// <summary>
61 /// 根据类型获取摘要算法名称
62 /// </summary>
63 /// <param name="t"></param>
64 /// <returns></returns>
65 private static HashAlgorithm getHashAlgorithm(HashType t) {
66 HashAlgorithm hash;
67 switch (t) {
68 case HashType.MD5:
69 hash = new MD5CryptoServiceProvider();
70 break;
71 case HashType.SHA1:
72 hash = new SHA1Managed();
73 break;
74 case HashType.SHA256:
75 hash = new SHA256Managed();
76 break;
77 case HashType.SHA384:
78 hash = new SHA384Managed();
79 break;
80 case HashType.SHA512:
81 hash = new SHA512Managed();
82 break;
83 case HashType.RIPEMD:
84 hash = new RIPEMD160Managed();
85 break;
86 default:
87 hash = new MD5CryptoServiceProvider();
88 break;
89 }
90 return hash;
91 }
92
93 /// <summary>
94 /// 加密
95 /// </summary>
96 /// <param name="hash"></param>
97 /// <param name="source"></param>
98 /// <returns></returns>
99 private static string Encrypto(HashAlgorithm hash, string source) {
100 string dest = string.Empty;
101 try
102 {
103 byte[] btSource = Encoding.Default.GetBytes(source);
104 byte[] btDest = hash.ComputeHash(btSource);
105 dest = Convert.ToBase64String(btDest, 0, btDest.Length);
106 }
107 catch (Exception ex)
108 {
109 throw ex;
110 }
111 return dest;
112 }
113 }
114
115 /// <summary>
116 /// 信息摘要类型
117 /// </summary>
118 public enum HashType {
119 MD5=0,
120 SHA1=1,
121 SHA256=2,
122 SHA384=3,
123 SHA512=4,
124 RIPEMD=5
125 }
126 }
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Security.Cryptography;
5 using System.Text;
6 using System.Threading.Tasks;
7
8 namespace DemoCrtpto
9 {
10 /// <summary>
11 /// 信息摘要帮助类
12 /// </summary>
13 public class HashHelper
14 {
15 #region 信息摘要
16
17 /// <summary>
18 /// MD5信息摘要
19 /// </summary>
20 /// <param name="source"></param>
21 /// <returns></returns>
22 public static string GetInfoByMd5(string source)
23 {
24 HashAlgorithm hash = getHashAlgorithm(HashType.MD5);
25 return Encrypto(hash, source);
26 }
27
28 public static string GetInfoBySHA1(string source)
29 {
30 HashAlgorithm hash = getHashAlgorithm(HashType.SHA1);
31 return Encrypto(hash, source);
32 }
33
34 public static string GetInfoBySHA256(string source)
35 {
36 HashAlgorithm hash = getHashAlgorithm(HashType.SHA256);
37 return Encrypto(hash, source);
38 }
39
40 public static string GetInfoBySHA384(string source)
41 {
42 HashAlgorithm hash = getHashAlgorithm(HashType.SHA384);
43 return Encrypto(hash, source);
44 }
45
46 public static string GetInfoBySHA512(string source)
47 {
48 HashAlgorithm hash = getHashAlgorithm(HashType.SHA512);
49 return Encrypto(hash, source);
50 }
51
52 public static string GetInfoByRipeMD(string source)
53 {
54 HashAlgorithm hash = getHashAlgorithm(HashType.RIPEMD);
55 return Encrypto(hash, source);
56 }
57
58 #endregion
59
60 /// <summary>
61 /// 根据类型获取摘要算法名称
62 /// </summary>
63 /// <param name="t"></param>
64 /// <returns></returns>
65 private static HashAlgorithm getHashAlgorithm(HashType t) {
66 HashAlgorithm hash;
67 switch (t) {
68 case HashType.MD5:
69 hash = new MD5CryptoServiceProvider();
70 break;
71 case HashType.SHA1:
72 hash = new SHA1Managed();
73 break;
74 case HashType.SHA256:
75 hash = new SHA256Managed();
76 break;
77 case HashType.SHA384:
78 hash = new SHA384Managed();
79 break;
80 case HashType.SHA512:
81 hash = new SHA512Managed();
82 break;
83 case HashType.RIPEMD:
84 hash = new RIPEMD160Managed();
85 break;
86 default:
87 hash = new MD5CryptoServiceProvider();
88 break;
89 |
