JS和利用openssl的object C加密得到相同的aes加密密文

Posted 2020-07-29 blitheG

　　这是之前接到的一个工作内容，项目原本的登录操作是获得账号和密码以后，对密码进行一遍MD5加密，然后传递账号和密文到cgi文件。在c中获取到账户以后，从数据库中获取到密码，对密码进行一次MD5的加密，然后将该密文与post过来的密文进行对比，进行登录验证。也就是说，虽然进行了一次密码加密，但是在get/post的过程中，该密文是可见的，不符合客户的保密需求。

　　经过协商以后决定，在传递的过程中不再对密码进行传输，而是将账号与session进行组合，组合成一个新的字符串以后，将密码当做密钥，进行一次AES的加密操作，以及一次MD5的加密操作生成用来POST的密文。而C中，获取到账号和密文以后，将账号和session组合，然后利用c中openssl的接口进行AES加密，MD5加密的操作获取新的密文，然后将该密文和传送得到的密文进行对比，进行登录验证。如此一来，密码的作用就仅仅是两边进行加密操作的密钥，而传送的验证字符串，更是进行了两次加密操作，大大提高了保密性。

　　在工作的过程中，遇到的最大难题到并非是加密的操作，而是JS中AES加密的密文和Object C中利用openSSL的AES加密的密文总是无法相同，而直到最后也没有解决JS和openssl的结果不同的问题，幸运的是，在工作的过程中，意外发现直接利用linux的aes加密命令却能获得和JS相同的密文（echo -n "secretsecretsecret" | openssl enc -e -a -aes-256-cbc -K 12345678 -iv 12345678）。于是，在CGI中添加了调用linux命令将结果写到文件中，然后读取文件的方式实现了这个操作。如果有人解决了这个问题，希望能够联系我，也可以发送邮件，我的邮箱地址是：[email protected]

　　首先是JS的，在JS的aes加密过程中，用了好几个不同的CryptoJs的库，虽然也是可以的到加密解密的实现，但是得到结果并不符合我的需要，直到使用Mark Percival 写的脚本：放上地址（https://github.com/mdp/gibberish-aes），放上代码：

 1     printf("<script type=\"text/javascript\" src=\"/bh/pjs/crypto-js-3.1.6/gibberish-aes.js\"></script>\n");
 2     printf("<script type=\"text/javascript\" src=\"/bh/pjs/crypto-js-3.1.6/jquery.md5.js\"></script>\n");
 3 
 4     printf("//--------------------------------aes MD5 加密-------------------------------------------------------------------------------\n");
 5     printf("    var plaintText = document.frm.UserName.value + session_tmp;\n");
 6     printf("    var keyStr = document.frm.UserPwd.value;\n");
 7     printf("    var addZero;\n");
 8     /* 利用网上流传比较多的CryptoJS的aes加密，解密
 9     * printf("    var key = CryptoJS.enc.Utf8.parse(keyStr);\n");
10     * printf("    plaintText = ‘00112233445566778899aabbccddeeff‘;\n");
11 
12     * printf("    var encryptedData = CryptoJS.AES.encrypt(plaintText, key, {\n");
13     * printf("        mode: CryptoJS.mode.ECB,\n");
14     * printf("        padding: CryptoJS.pad.Pkcs7\n");
15     * printf("        padding: CryptoJS.pad.NoPadding\n");
16     * printf("    });\n");
17     * printf("    var encryptedBase64Str = encryptedData.toString();\n");
18     * printf("    var encryptedStr = encryptedData.ciphertext.toString();\n");
19     * //解密
20     * printf("    var encryptedHexStr = CryptoJS.enc.Hex.parse(encryptedStr);\n");
21     * printf("    var encryptedBase64Str = CryptoJS.enc.Base64.stringify(encryptedHexStr);\n");
22     * //printf("    var decryptedStr = CryptoJS.AES.decrypt(CryptoJS.lib.CipherParams.create({ ciphertext: CryptoJS.enc.Hex.parse(encryptedStr) }), key, { mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7 }).toString();");
23     * printf("    var decryptedData = CryptoJS.AES.decrypt(encryptedBase64Str, key, { \n");
24     * printf("        mode: CryptoJS.mode.ECB,\n");
25     * printf("        padding: CryptoJS.pad.Pkcs7\n");
26     * printf("    });\n");
27     * printf("    var decryptedStr = decryptedData.toString(CryptoJS.enc.Utf8); \n");
28     * printf("    console.log(\"jiemi:\"+decryptedStr); \n");
29     */
30 
31     printf("\n    /*AES加密前，将密钥转为16进制，将向量为sessio，再手动补位*/\n");
32     printf("    var keyStr16 = stringToHex(keyStr);\n");
33     printf("    var keyStr_iv = session_tmp;\n");
34     printf("    console.log(\"plaint:\"+plaintText+\", len1:\"+plaintText.length+\", len2:\"+addZero+\", keyStr:\"+keyStr);\n");
35     printf("    for(addZero = 64 - keyStr16.length;addZero > 0;addZero--){\n");
36     printf("        keyStr16 = keyStr16 + \"0\";\n");
37     printf("    };\n");
38     printf("    for(addZero = 32 - keyStr_iv.length;addZero > 0;addZero--){\n");
39     printf("        keyStr_iv = keyStr_iv + \"0\";\n");
40     printf("    };\n");
41     printf("    console.log(\"plaintText\"+plaintText+\"keyStr:\"+keyStr16+\"keyStr_iv:\"+keyStr_iv);\n");
42 
43     printf("\n    /*AES加密，Gibberrish私有库*/\n");
44     printf("    GibberishAES.size(256);\n");
45     printf("    var password = GibberishAES.h2a(keyStr16);\n");
46     printf("    var iv = GibberishAES.h2a(keyStr_iv);\n");
47     printf("    var plaintext = GibberishAES.s2a(plaintText);\n");
48     printf("    var plaintext_enc = GibberishAES.rawEncrypt(plaintext, password, iv);\n");
49     printf("    var plaintext_str64 = GibberishAES.Base64.encode(plaintext_enc);\n");
50     printf("    console.log(\"plaintext_str64 is :\"+plaintext_str64);\n");
51 
52     
53     printf("\n    /*密文转为Base64格式*/\n");
54     printf("    plaintext_str64_str = plaintext_str64.toString();\n");
55     printf("    plaintext_str64_str = plaintext_str64_str.substr(0,plaintext_str64_str.length-1);\n");
56 
57     printf("\n    /*MD5 加密*/\n");
58     printf("    plaintText = $.md5(plaintext_str64_str);\n");    
59     printf("    console.log(\"MD5_Str:\"+plaintText);\n");
60     printf("    if(document.frm.UserPwd.value!=\"\"){document.frm.UserPwd.value = plaintText;}\n");

 

　　插入Object C的代码，在Object C中，我利用openssl实现了AES的ebc和cbc两种方式的加密，但是可能是openssl的加密函数与命令实现时进行的补位操作不同，导致的到的密文也是不相同的：

  1 #include <openssl/aes.h>
  2 #include <openssl/md5.h>
  3     //---------------------------------- aes 加密 -------------------------
  4 
  5     /* 利用openssl接口带有的AES函数进行的ecb加密解密
  6     * char key[16],*text=NULL,temp_plaint[256],temp_session[256];
  7     * //memset(text,0,sizeof(text));
  8     * memset(temp_session,0,sizeof(temp_session));
  9     * memset(temp_plaint,0,sizeof(temp_plaint));
 10     * memset(key,0,16);
 11     * if(strlen(password)<16){
 12     *     int fixZero = 16-strlen(password);
 13     *     char *fix = "0";
 14     *     for(i =0; i<fixZero;i++){
 15     *         strcat(password,fix);
 16     *     }
 17     * }
 18     * memcpy(key,password,strlen(password));
 19 
 20     * //user = "admin6291494661564876577";
 21     * //strcpy(text,user);
 22     * //text = user;
 23     * //sprintf(temp_session,"%llu",session);
 24     * //strcat(text,temp_session);
 25     * text = "super";
 26 
 27     * AES_KEY aes_key;
 28     * AES_set_encrypt_key((unsigned char *)key, 128, &aes_key);
 29 
 30     * int text_len = strlen(text);
 31     * int blk_num = (text_len / AES_BLOCK_SIZE) + 1;
 32     * int alg_len = blk_num * AES_BLOCK_SIZE;
 33 
 34     * //uint8_t *alg_s = (typeof(alg_s)) malloc(alg_len);
 35     * unsigned char *alg_s = malloc(alg_len);
 36     * memcpy(alg_s, text, text_len);
 37     * int pad = AES_BLOCK_SIZE - text_len % AES_BLOCK_SIZE;
 38 
 39     * for (i = text_len; i < alg_len; i++) {
 40     *     alg_s[i] = pad;
 41     * }
 42 
 43     * int enc_len = alg_len;
 44 
 45     * unsigned char *enc_s = malloc(enc_len);
 46     * memset(enc_s, 0, enc_len);
 47     * for (i = 0; i < blk_num; i++) {
 48     *     //AES_ecb_encrypt(OFFOF(alg_s, i * AES_BLOCK_SIZE), OFFOF(enc_s, i * AES_BLOCK_SIZE), &aes_key, AES_ENCRYPT);
 49     *     AES_ecb_encrypt(alg_s + i * AES_BLOCK_SIZE, enc_s + i * AES_BLOCK_SIZE, &aes_key, AES_ENCRYPT);
 50     *     trace("%02x ,%d\n",enc_s[i],i);
 51     * }
 52 
 53     * int t =0;
 54     * for (i = 0; i < enc_len; i++) {
 55     *     if(t)    t += sprintf(temp_plaint + t,"%02x", enc_s[i]);
 56     *     else    t = sprintf(temp_plaint,"%02x", enc_s[i]);
 57     * }
 58 
 59 
 60     * //解密
 61     * AES_set_decrypt_key(key, 128, &aes_key);
 62     * int dec_len = enc_len;
 63     * uint8_t *dec_s = (typeof(dec_s)) malloc(dec_len);
 64     * for (i = 0; i < blk_num; i++) {
 65     *     AES_ecb_encrypt(OFFOF(enc_s, i * AES_BLOCK_SIZE), OFFOF(dec_s, i * AES_BLOCK_SIZE), &aes_key, AES_DECRYPT);
 66     * }
 67     */
 68 
 69     /* 利用openssl接口带有的AES函数进行的cbc加密解密
 70     * unsigned char pt[64] = "secretsecretsecret";
 71     * unsigned char kt[64] = "1234567800000000000000000000000000000000000000000000000000000000";
 72     * unsigned char it[33] = "12345678000000000000000000000000";
 73     * // char pt[64] = "secretsecretsecret";
 74     * //char kt[65] = "1234567800000000000000000000000000000000000000000000000000000000";
 75     * //char it[33] = "12345678000000000000000000000000";
 76     * // char kt[64] = "12345678";
 77     * // char it[32] = "12345678";
 78 
 79     * unsigned char plainText[AES_BLOCK_SIZE * 4];
 80     * unsigned char cipherText[AES_BLOCK_SIZE * 4];
 81     * unsigned char keyText[AES_BLOCK_SIZE*4];
 82     * unsigned char ivText[AES_BLOCK_SIZE*2];
 83     * unsigned char ivdecText[AES_BLOCK_SIZE*2];
 84     * AES_KEY aes_key;
 85     * char plainText[AES_BLOCK_SIZE * 4];
 86     * char cipherText[AES_BLOCK_SIZE * 4];
 87     * char keyText[AES_BLOCK_SIZE * 4];
 88     * char ivText[AES_BLOCK_SIZE * 2];
 89     * char ivdecText[AES_BLOCK_SIZE * 2];
 90 
 91     * memset(plainText,0,sizeof(plainText));
 92     * memset(cipherText,0,sizeof(cipherText));
 93     * memset(keyText,0,sizeof(keyText));
 94     * memset(ivText,0,sizeof(ivText));
 95     * memset(ivdecText,0,sizeof(ivdecText));
 96 
 97     * memcpy(plainText,pt,strlen(pt));
 98     * memcpy(keyText,kt,strlen(kt));
 99     * memcpy(ivText,it,strlen(it));
100     * memcpy(ivdecText,it,strlen(it));
101 
102     * // strcpy(plainText,pt);
103     * // strcpy(keyText,kt);
104     * // strcpy(ivText,it);
105     * //strcpy(ivdecText,ivText);
106     * // strcpy(ivdecText,it);
107 
108     * // strncpy(plainText,pt,strlen(pt));
109     * // strncpy(keyText,kt,strlen(kt));
110     * // strncpy(ivText,it,strlen(it));
111     * // strncpy(ivdecText,it,strlen(it));
112 
113     * for(i = 0;i < sizeof(plainText);++i){
114     *     if(plainText[i] == 0)    break;
115     * }
116     * AES_set_encrypt_key((unsigned char*)keyText,256,&aes_key);
117     * AES_cbc_encrypt((unsigned char *)plainText,(unsigned char *)cipherText,sizeof(plainText),&aes_key,(unsigned char *)ivText,AES_ENCRYPT);
118 
119     * char temw[256];
120     * for(i = 0;i < sizeof(cipherText);++i){
121     *     if(cipherText[i] == 0)    break;
122     *     sprintf(&temw[i],"%02x",cipherText[i]&0xff);
123     * }
124     * char plainba64[256];
125     * memset(plainba64,0,strlen(plainba64));
126     * int t_len;
127     * base64_encode((unsigned char *)temw,(unsigned char *)plainba64,strlen(temw),&t_len);
128     * AES_set_decrypt_key((unsigned char *)keyText,256,&aes_key);
129     * AES_cbc_encrypt((unsigned char *)cipherText,(unsigned char *)plainText,sizeof(cipherText),&aes_key,(unsigned char *)ivdecText,AES_DECRYPT);
130     * for(i = 0;i < sizeof(plainText);++i){
131     *     if(plainText[i] == 0)    break;
132     * }
133     */
134 
135     /*将session，明文， key，iv合成字符串*/
136     int t = 0,cmd = 0,wlen = 0;
137     char buff_CBC[256],buff_CBC_cmd[256],userText[256],keyText[65],temp_session[256],file[256],buff_ret[1024],*cbcText_f;
138     FILE *fp = NULL;
139     SlasRes sr;
140 
141     memset(keyText,0,sizeof(keyText));
142     memset(buff_ret,0,sizeof(buff_ret));
143     memset(temp_session,0,sizeof(temp_session));
144 
145     /*session*/
146     sprintf(temp_session,"%llu",session);
147     strcpy(buff_CBC,temp_session);
148     strcat(buff_CBC,",");
149 
150     /*mingwen*/
151     strcpy(userText,user);
152     strcat(userText,temp_session);
153     strcat(buff_CBC,userText);
154     strcat(buff_CBC,",");
155 
156     /*key,转换成16进制*/
157     for(i = 0;i<strlen(password);i++){
158         if(password[i] == 0)    break;
159         if(t)    t += sprintf(keyText+t,"%02x",password[i]);
160         else    t = sprintf(keyText,"%02x",password[i]);
161     }
162     strcat(buff_CBC,keyText);
163     strcat(buff_CBC,",");
164 
165     /*iv*/
166     strcat(buff_CBC,temp_session);
167     //trace("\nbuff_CBC:%s\n",buff_CBC);
168         
169     cmd = CMD_PASS_CBC_ENC;
170     memcpy(buff_CBC_cmd, &cmd, sizeof(int));
171     memcpy(buff_CBC_cmd+sizeof(int),buff_CBC,strlen(buff_CBC));
172     wlen = strlen(buff_CBC)+4;
173     ret = CGIServerData((char *)buff_CBC_cmd,(int *)&wlen,&sr);
174     if(ret != 0 || sr.error || sr.state){
175         printf("error");
176         goto _END_;
177     }
178 
179     strcpy(file,"/var/tmp/sess/sess_");
180     strcat(file,temp_session);
181 
182     fp = fopen(file, "r");
183     if(NULL == fp){
184         printf("error");
185         unlink(file);
186         goto _END_;
187     }
188 
189     fread(buff_ret,1024,1,fp);
190     cbcText_f = memmem(buff_ret,1024,"ffff",4);
191 /*    if(cbcText == NULL){
192         printf("error");
193         goto _END_;
194     }
195 */
196 
197     //-------------------------------- MD5 加密---------------------------------
198 
199     char *data;
200     unsigned char md[16];
201     memset(md,0,sizeof(md));
202     char tmp[3]={‘\0‘},buf[33]={‘\0‘};
203 
204     data = cbcText_f+4;
205     data[strlen(data)-1] = ‘\0‘;
206 
207     //trace("date:%s,%d",data,strlen(data));
208     MD5_CTX ctx;
209     MD5_Init(&ctx);
210     MD5_Update(&ctx,data,strlen(data));
211     MD5_Final(md,&ctx);
212 
213     for (i = 0; i < 16; i++){
214         sprintf(tmp,"%02x",md[i]&0xff);
215         strcat(buf,tmp);
216     }