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这几天空闲时间就想研究一下加密，环境是web程序，通过js请求后台返回数据，我想做的事js在发送请求前将数据加密，服务端收到后解密，待服务端处理完请求后，将处理结果加密返回给客户端，客户端在解密，于是选择了RSA非对称加密，即客户端生成一对密钥，服务端生成一对密钥，两者分别将公钥给对方（页面第一次加载时请求一次服务器），但是，rsa加密，对加密的内容有长度限制，网上说可以分段加密，于是各种百度，代码都不行，而且分段加密后，服务器使用客户端的公钥无法解密了，于是换了一种思路，使用AES，但是AES要求加密解密都要使用相同的密钥，就是客户端密钥和服务器端密钥必须相同，那么问题来了，在服务器端生成密钥后，客户端js去请求获取密钥保存在本地的时候，这个过程是可以抓包的，这样别人就知道你服务器上和客户端上的密钥了，这个不安全，解决办法是客户端生成一对RSA密钥，通过js请求将公钥给服务器，服务器生成AES密钥后通过RSA公钥加密回传给客户端，这样就保证了即使抓包了，看到的数据也是rsa加密的，客户端在收到结果后，先通过RSA私钥解密，即可得到AES密钥，保存在本地session中，切勿保存在cookie中，因为抓包可以看到cookie，这样以后每次请求，服务器和客户端都将数据加密，上代码：
1.生成aes密钥的服务器端
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1 using System;
2 using System.Collections.Generic;
3 using System.IO;
4 using System.Linq;
5 using System.Security.Cryptography;
6 using System.Text;
7 using System.Web;
8
9 namespace WebApplication1
10 {
11 /// <summary>
12 /// AAA 接收客户端提供的RAS公钥，生成aes密钥和向量，通过RAS公钥加密后返回给客户端
13 /// </summary>
14 public class AAA : IHttpHandler
15 {
16 private RSACryptoServiceProvider _privateKeyRsaProvider;
17 private RSACryptoServiceProvider _publicKeyRsaProvider;
18 private string client_public_key = string.Empty;
19 public void ProcessRequest(HttpContext context)
20 {
21
22 client_public_key = context.Request.Params["client_public_key"].ToString();
23 client_public_key = client_public_key.Replace("-----BEGIN PUBLIC KEY-----\n", string.Empty);
24 client_public_key = client_public_key.Replace("\n-----END PUBLIC KEY-----", string.Empty);
25 string guid = GuidTo16String();//生成aes的密钥
26 string iv = GuidTo16String();//我们还可以生成iv
27
28 //将生产的aes密钥和向量分别存在服务器中，以后要用直接取
29 //Keys.aes_keys.Add(context.Session.SessionID, guid);
30
31 string data = Encrypt(guid);//加密
32 context.Response.Write(data);
33 }
34
35 #region 加密
36 public string Encrypt(string text)
37 {
38 _publicKeyRsaProvider = CreateRsaProviderFromPublicKey(client_public_key);
39 return Convert.ToBase64String(_publicKeyRsaProvider.Encrypt(Encoding.UTF8.GetBytes(text), false));
40 }
41
42 private RSACryptoServiceProvider CreateRsaProviderFromPublicKey(string publicKeyString)
43 {
44 byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
45 byte[] x509key;
46 byte[] seq = new byte[15];
47 int x509size;
48
49 x509key = Convert.FromBase64String(publicKeyString);
50 x509size = x509key.Length;
51
52 using (MemoryStream mem = new MemoryStream(x509key))
53 {
54 using (BinaryReader binr = new BinaryReader(mem))
55 {
56 byte bt = 0;
57 ushort twobytes = 0;
58
59 twobytes = binr.ReadUInt16();
60 if (twobytes == 0x8130)
61 binr.ReadByte();
62 else if (twobytes == 0x8230)
63 binr.ReadInt16();
64 else
65 return null;
66
67 seq = binr.ReadBytes(15);
68 if (!CompareBytearrays(seq, SeqOID))
69 return null;
70
71 twobytes = binr.ReadUInt16();
72 if (twobytes == 0x8103)
73 binr.ReadByte();
74 else if (twobytes == 0x8203)
75 binr.ReadInt16();
76 else
77 return null;
78
79 bt = binr.ReadByte();
80 if (bt != 0x00)
81 return null;
82
83 twobytes = binr.ReadUInt16();
84 if (twobytes == 0x8130)
85 binr.ReadByte();
86 else if (twobytes == 0x8230)
87 binr.ReadInt16();
88 else
89 return null;
90
91 twobytes = binr.ReadUInt16();
92 byte lowbyte = 0x00;
93 byte highbyte = 0x00;
94
95 if (twobytes == 0x8102)
96 lowbyte = binr.ReadByte();
97 else if (twobytes == 0x8202)
98 {
99 highbyte = binr.ReadByte();
100 lowbyte = binr.ReadByte();
101 }
102 else
103 return null;
104 byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };
105 int modsize = BitConverter.ToInt32(modint, 0);
106
107 int firstbyte = binr.PeekChar();
108 if (firstbyte == 0x00)
109 {
110 binr.ReadByte();
111 modsize -= 1;
112 }
113
114 byte[] modulus = binr.ReadBytes(modsize);
115
116 if (binr.ReadByte() != 0x02)
117 return null;
118 int expbytes = (int)binr.ReadByte();
119 byte[] exponent = binr.ReadBytes(expbytes);
120
121 RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
122 RSAParameters RSAKeyInfo = new RSAParameters();
123 RSAKeyInfo.Modulus = modulus;
124 RSAKeyInfo.Exponent = exponent;
125 RSA.ImportParameters(RSAKeyInfo);
126
127 return RSA;
128 }
129
130 }
131 }
132
133 private bool CompareBytearrays(byte[] a, byte[] b)
134 {
135 if (a.Length != b.Length)
136 return false;
137 int i = 0;
138 foreach (byte c in a)
139 {
140 if (c != b[i])
141 return false;
142 i++;
143 }
144 return true;
145 }
146 #endregion
147
148 #region 解密
149 public string Decrypt(string cipherText)
150 {
151 if (_privateKeyRsaProvider == null)
152 {
153 throw new Exception("_privateKeyRsaProvider is null");
154 }
155 return Encoding.UTF8.GetString(_privateKeyRsaProvider.Decrypt(System.Convert.FromBase64String(cipherText), false));
156 }
157
158 private RSACryptoServiceProvider CreateRsaProviderFromPrivateKey(string privateKey)
159 {
160 var privateKeyBits = System.Convert.FromBase64String(privateKey);
161
162 var RSA = new RSACryptoServiceProvider();
163 var RSAparams = new RSAParameters();
164
165 using (BinaryReader binr = new BinaryReader(new MemoryStream(privateKeyBits)))
166 {
167 byte bt = 0;
168 ushort twobytes = 0;
169 twobytes = binr.ReadUInt16();
170 if (twobytes == 0x8130)
171 binr.ReadByte();
172 else if (twobytes == 0x8230)
173 binr.ReadInt16();
174 else
175 throw new Exception("Unexpected value read binr.ReadUInt16()");
176
177 twobytes = binr.ReadUInt16();
178 if (twobytes != 0x0102)
179 throw new Exception("Unexpected version");
180
181 bt = binr.ReadByte();
182 if (bt != 0x00)
183 throw new Exception("Unexpected value read binr.ReadByte()");
184
185 RSAparams.Modulus = binr.ReadBytes(GetIntegerSize(binr));
186 RSAparams.Exponent = binr.ReadBytes(GetIntegerSize(binr));
187 RSAparams.D = binr.ReadBytes(GetIntegerSize(binr));
188 RSAparams.P = binr.ReadBytes(GetIntegerSize(binr));
189 RSAparams.Q = binr.ReadBytes(GetIntegerSize(binr));
190 RSAparams.DP = binr.ReadBytes(GetIntegerSize(binr));
191 RSAparams.DQ = binr.ReadBytes(GetIntegerSize(binr));
192 RSAparams.InverseQ = binr.ReadBytes(GetIntegerSize(binr));
193 }
194
195 RSA.ImportParameters(RSAparams);
196 return RSA;
197 }
198
199 private int GetIntegerSize(BinaryReader binr)
200 {
201 byte bt = 0;
202 byte lowbyte = 0x00;
203 byte highbyte = 0x00;
204 int count = 0;
205 bt = binr.ReadByte();
206 if (bt != 0x02)
207 return 0;
208 bt = binr.ReadByte();
209
210 if (bt == 0x81)
211 count = binr.ReadByte();
212 else
213 if (bt == 0x82)
214 {
215 highbyte = binr.ReadByte();
216 lowbyte = binr.ReadByte();
217 byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };
218 count = BitConverter.ToInt32(modint, 0);
219 }
220 else
221 {
222 count = bt;
223 }
224
225 while (binr.ReadByte() == 0x00)
226 {
227 count -= 1;
228 }
229 binr.BaseStream.Seek(-1, SeekOrigin.Current);
230 return count;
231 }
232 #endregion
233
234 public static string GuidTo16String()
235 {
236 long i = 1;
237 foreach (byte b in Guid.NewGuid().ToByteArray())
238 i *= ((int)b + 1);
239 return string.Format("{0:x}", i - DateTime.Now.Ticks);
240 }
241
242
243 public bool IsReusable
244 {
245 get
246 {
247 return false;
248 }
249 }
250 }
251 }
2.模拟客户端提交加密数据，服务端返回加密数据的服务端
1 using System;
2 using System.Collections.Generic;
3 using System.IO;
4 using System.Linq;
5 using System.Security.Cryptography;
6 using System.Text;
7 using System.Web;
8
9 namespace WebApplication1
10 {
11 /// <summary>
12 /// BBB 的摘要说明
13 /// </summary>
14 public class BBB : IHttpHandler
15 {
16
17 public void ProcessRequest(HttpContext context)
18 {
19 string key = context.Request.Params["aaa"].ToString();
20 string data = context.Request.Params["bbb"].ToString();
21 string aaa = AESDecrypt(data, key, "");
22 //解密成功后再加密返回给客户端
23 data = AESEncrypt("我解密加密都正常,"+aaa, key, "");
24 context.Response.Write(data);
25
26 }
27
28 /// <summary>
29 /// AES加密算法
30 /// </summary>
31 /// <param name="plainText">明文字符串</param>
32 /// <returns>将加密后的密文转换为Base64编码，以便显示</returns>
33 public string AESEncrypt(string plainText, string key, string iv)
34 {
35 iv = "AAABBBCCCDDDEEEF";
36 var _keyByte = Encoding.UTF8.GetBytes(key);
37 var _valueByte = Encoding.UTF8.GetBytes(plainText);
38 using (var aes = new RijndaelManaged())
39 {
40 aes.IV = !string.IsNullOrEmpty(iv) ? Encoding.UTF8.GetBytes(iv) : Encoding.UTF8.GetBytes(key.Substring(0, 16));
41 aes.Key = _keyByte;
42 aes.Mode = CipherMode.CBC;
43 aes.Padding = PaddingMode.PKCS7;
44 var cryptoTransform = aes.CreateEncryptor();
45 var resultArray = cryptoTransform.TransformFinalBlock(_valueByte, 0, _valueByte.Length);
46 return Convert.ToBase64String(resultArray, 0, resultArray.Length);
47 }
48
49 }
50
51
52 /// <summary>
53 /// AES解密
54 /// </summary>
55 /// <param name="cipherText">密文字符串</param>
56 /// <returns>返回解密后的明文字符串</returns>
57 public static string AESDecrypt(string showText, string key, string iv)
58 {
59 iv = "AAABBBCCCDDDEEEF";
60 byte[] keyArray = Encoding.UTF8.GetBytes(key);
61 byte[] toEncryptArray = Convert.FromBase64String(showText.Trim());
62 byte[] toIV = Encoding.UTF8.GetBytes(iv);
63
64 RijndaelManaged rDel = new RijndaelManaged();
65 rDel.Key = keyArray;
66 rDel.Mode = CipherMode.CBC;
67 rDel.Padding = PaddingMode.PKCS7;
68 rDel.IV = toIV;
69
70 ICryptoTransform cTransform = rDel.CreateDecryptor();
71 byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
72
73 return Encoding.UTF8.GetString(resultArray);// UTF8Encoding.UTF8.GetString(resultArray);
74 }
75
76 public bool IsReusable
77 {
78 get
79 {
80 return false;
81 }
82 }
83 }
84 }
3.客户端js获取到密钥后再发送请求模拟数据交互中的加密解密，可以将AES加密解密的方法封装一下，自行处理
1 <!DOCTYPE html>
2 <html xmlns="http://www.w3.org/1999/xhtml">
3 <head>
4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
5 <title></title>
6 <script src="jquery1.8.3.min.js"></script>
7 <script src="jsencrypt.js"></script>
8 <script src="aes.js"></script>
9 <script>
10 $(function () {
11 //客户端rsa密钥对
12 var encrypt = new JSEncrypt();
13 var publickey1 = encrypt.getPublicKey();//公钥
14 var privatekey1 = encrypt.getPrivateKey();//私钥
15 publickey1 = publickey1.replace("-----BEGIN PUBLIC KEY-----\n", "");
16 publickey1 = publickey1.replace("\n-----END PUBLIC KEY-----", "");
17
18 //发送一个请求，将rsa公钥给服务器，服务器将AES密钥加密后返回给客户端
19 $.post("AAA.ashx", { client_public_key: publickey1 }, function (result) {
20
21 console.log("服务端返回的公钥加密AES密钥" + result);
22 console.log("解密服务器回传的AES加密密钥" + encrypt.decrypt(result));//使用rsa私钥解密得到AES加解密密钥
23 sessionStorage.setItem("aes", encrypt.decrypt(result));//保存在本地
24
25 var data = "数据是安全的,";
26 console.log("AES加密前：" + data);
27
28
29 //加密
30 var key = CryptoJS.enc.Utf8.parse(sessionStorage.getItem("aes"));
31 var srcs = CryptoJS.enc.Utf8.parse(data);
32 var encryptedData = CryptoJS.AES.encrypt(srcs, key, {
33 iv:CryptoJS.enc.Utf8.parse("AAABBBCCCDDDEEEF"),//iv为加密向量，服务器和客户端必须相同，长度为16，为保险，向量也可由服务器生成后和AES密钥一起加密返回给客户端
34 mode: CryptoJS.mode.CBC,
35 padding: CryptoJS.pad.Pkcs7
36 });
37 var encryptedHexStr = CryptoJS.enc.Hex.parse(encryptedData.ciphertext.toString());
38 var srcs = CryptoJS.enc.Base64.stringify(encryptedHexStr);
39 console.log("客户端AES加密后：" + srcs);
40
41 //解密
42 var decrypt = CryptoJS.AES.decrypt(srcs, key, { iv: CryptoJS.enc.Utf8.parse("AAABBBCCCDDDEEEF"), mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 });
43 var decryptedStr = decrypt.toString(CryptoJS.enc.Utf8);
44 console.log("客户端解密AES：" + decryptedStr);
45
46 //将加密后的数据提交服务器进行解密，然后服务器处理后同样返回一个加密数据给客户端解密
47 var a = sessionStorage.getItem("aes");
48 $.post("BBB.ashx", { aaa: a, bbb: srcs }, function (bbc) {
49 var decrypt1 = CryptoJS.AES.decrypt(bbc, key, { iv: CryptoJS.enc.Utf8.parse("AAABBBCCCDDDEEEF"), mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 });
50 console.log("客户端得到服务器的回答内容,经过解密得到：" + decrypt1.toString(CryptoJS.enc.Utf8));
51 });
52
53 });
54
55 });
56 </script>
57
58 </head>
59 <body>
60
61 </body>
62 </html>
4.最后是使用的js文件源码
aes.js:
!function(t,n){"object"==typeof exports?module.exports=exports=n():"function"==typeof define&&define.amd?define([],n):t.CryptoJS=n()}(this,function(){var t=t||function(t,n){var i=Object.create||function(){function t(){}return function(n){var i;return t.prototype=n,i=new t,t.prototype=null,i}}(),e={},r=e.lib={},o=r.Base=function(){return{extend:function(t){var n=i(this);return t&&n.mixIn(t),n.hasOwnProperty("init")&&this.init!==n.init||(n.init=function(){n.$super.init.apply(this,arguments)}),n.init.prototype=n,n.$super=this,n},create:function(){var t=this.extend();return t.init.apply(t,arguments),t},init:function(){},mixIn:function(t){for(var n in t)t.hasOwnProperty(n)&&(this[n]=t[n]);t.hasOwnProperty("toString")&&(this.toString=t.toString)},clone:function(){return this.init.prototype.extend(this)}}}(),s=r.WordArray=o.extend({init:function(t,i){t=this.words=t||[],i!=n?this.sigBytes=i:this.sigBytes=4*t.length},toString:function(t){return(t||c).stringify(this)},concat:function(t){var n=this.words,i=t.words,e=this.sigBytes,r=t.sigBytes;if(this.clamp(),e%4)for(var o=0;o<r;o++){var s=i[o>>>2]>>>24-o%4*8&255;n[e+o>>>2]|=s<<24-(e+o)%4*8}else for(var o=0;o<r;o+=4)n[e+o>>>2]=i[o>>>2];return this.sigBytes+=r,this},clamp:function(){var n=this.words,i=this.sigBytes;n[i>>>2]&=4294967295<<32-i%4*8,n.length=t.ceil(i/4)},clone:function(){var t=o.clone.call(this);return t.words=this.words.slice(0),t},random:function(n){for(var i,e=[],r=function(n){var n=n,i=987654321,e=4294967295;return function(){i=36969*(65535&i)+(i>>16)&e,n=18e3*(65535&n)+(n>>16)&e;var r=(i<<16)+n&e;return r/=4294967296,r+=.5,r*(t.random()>.5?1:-1)}},o=0;o<n;o+=4){var a=r(4294967296*(i||t.random()));i=987654071*a(),e.push(4294967296*a()|0)}return new s.init(e,n)}}),a=e.enc={},c=a.Hex={stringify:function(t){for(var n=t.words,i=t.sigBytes,e=[],r=0;r<i;r++){var o=n[r>>>2]>>>24-r%4*8&255;e.push((o>>>4).toString(16)),e.push((15&o).toString(16))}return e.join("")},parse:function(t){for(var n=t.length,i=[],e=0;e<n;e+=2)i[e>>>3]|=parseInt(t.substr(e,2),16)<<24-e%8*4;return new s.init(i,n/2)}},u=a.Latin1={stringify:function(t){for(var n=t.words,i=t.sigBytes,e=[],r=0;r<i;r++){var o=n[r>>>2]>>>24-r%4*8&255;e.push(String.fromCharCode(o))}return e.join("")},parse:function(t){for(var n=t.length,i=[],e=0;e<n;e++)i[e>>>2]|=(255&t.charCodeAt(e))<<24-e%4*8;return new s.init(i,n)}},f=a.Utf8={stringify:function(t){try{return decodeURIComponent(escape(u.stringify(t)))}catch(t){throw new Error("Malformed UTF-8 data")}},parse:function(t){return u.parse(unescape(encodeURIComponent(t)))}},h=r.BufferedBlockAlgorithm=o.extend({reset:function(){this._data=new s.init,this._nDataBytes=0},_append:function(t){"string"==typeof t&&(t=f.parse(t)),this._data.concat(t),this._nDataBytes+=t.sigBytes},_process:function(n){var i=this._data,e=i.words,r=i.sigBytes,o=this.blockSize,a=4*o,c=r/a;c=n?t.ceil(c):t.max((0|c)-this._minBufferSize,0);var u=c*o,f=t.min(4*u,r);if(u){for(var h=0;h<u;h+=o)this._doProcessBlock(e,h);var p=e.splice(0,u);i.sigBytes-=f}return new s.init(p,f)},clone:function(){var t=o.clone.call(this);return t._data=this._data.clone(),t},_minBufferSize:0}),p=(r.Hasher=h.extend({cfg:o.extend(),init:function(t){this.cfg=this.cfg.extend(t),this.reset()},reset:function(){h.reset.call(this),this._doReset()},update:function(t){return this._append(t),this._process(),this},finalize:function(t){t&&this._append(t);var n=this._doFinalize();return n},blockSize:16,_createHelper:function(t){return function(n,i){return new t.init(i).finalize(n)}},_createHmacHelper:function(t){return function(n,i){return new p.HMAC.init(t,i).finalize(n)}}}),e.algo={});return e}(Math);return t});
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