一个小问题，不管你懂没懂，反正我是没懂……

[wangkunhong]

void JNICALL 
cbClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv* env,
                jclass class_being_redefined, jobject loader,
                const char* name, jobject protection_domain,
                jint class_data_len, const unsigned char* class_data,
                jint* new_class_data_len, unsigned char** new_class_data)

{

	char *r="com/yy/hunter";
	char *p;
	p=strstr(name,r);
	if(p){
		printf("需要解密的class name=%s\n", name);
		//此处解密；
		enter_critical_section(jvmti_env); 
		{
			printf("开始解密a%s\n",name);
			printf("%s\n",class_data);

			unsigned char key[] = "hsylgwk-20120101";
			AES aes(key);

			//int o_len = aes.getUCharLen(class_data);

			//printf("class_data len=%s\n",o_len);
			printf("class_data len=%s\n","aaaaaaaaaaaaaaaaaaaaaaaaaaa");

			char* old_data;
			old_data = (char *)allocate(jvmti_env, class_data_len);
			(void)memcpy((void*)old_data, (void*)(class_data), (int)class_data_len);
			//memcpy(old_data,class_data,class_data_len);
			printf("%s\n",old_data);
			
			printf("%s\n","bbbbbbbbbbbbbbbbbbbbbbbbb");
			
			char hex_data[1024];
			//memset(hex_data, 0, 20);
			aes.Bm53InvCipher(old_data, hex_data);
			printf("%s\n",hex_data);

			printf("%s\n","cccccccccccccccccccccccccccccc");

			unsigned char *de_hex_data = (unsigned char *)malloc(strlen(hex_data));
			//strcpy(de_hex_data,hex_data);
			memcpy(de_hex_data,hex_data,strlen(hex_data));
			aes.InvCipher(de_hex_data);
			printf("%s\n",de_hex_data);


			printf("%s\n","ddddddddddddddddddddddddddddddd");
			//int nLen = strlen(old_data);
			unsigned int len = strlen((char*)old_data);
			m_pJvmTI->Allocate(len, (unsigned char **)&old_data);


			free(old_data);
			
			printf("%s\n","eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");

			
		}
		exit_critical_section(jvmti_env);
	}
   
}

为什么每执行一次打印出来的class_data都自动在后面加上了一些乱的字符呢？看一下运行结果。。。。

开始解密acom/yy/hunter/servlet/UploaderServlet
27781ec819a6cca1c56f47da4faedf2c27781ec819a6cca1c56f47d
a4faedf2c27781ec819a6cca1c56f47da4faedf2c?R
class_data len=aaaaaaaaaaaaaaaaaaaaaaaaaaa
27781ec819a6cca1c56f47da4faedf2c27781ec819a6cca1c56f47d
a4faedf2c27781ec819a6cca1c56f47da4faedf2c?R!
bbbbbbbbbbbbbbbbbbbbbbbbb
360TOP1奢侈品360TOP1奢侈品360TOP1奢侈品hD?娌舞8?騿矓#
cccccccccccccccccccccccccccccc
@
BzC&T斘抴?360TOP1奢侈品360TOP1奢侈品hD?娌舞8?騿矓#葺葺葺葺葺葺n钢
鷜
ddddddddddddddddddddddddddddddd


开始解密acom/yy/hunter/servlet/UploaderServlet
27781ec819a6cca1c56f47da4faedf2c27781ec819a6cca1c56f47d
a4faedf2c27781ec819a6cca1c56f47da4faedf2cZt)l
class_data len=aaaaaaaaaaaaaaaaaaaaaaaaaaa
27781ec819a6cca1c56f47da4faedf2c27781ec819a6cca1c56f47d
a4faedf2c27781ec819a6cca1c56f47da4faedf2c't)l
bbbbbbbbbbbbbbbbbbbbbbbbb
360TOP1奢侈品360TOP1奢侈品360TOP1奢侈品燩'?
cccccccccccccccccccccccccccccc
@
BzC&T斘抴?360TOP1奢侈品360TOP1奢侈品燩'慅葺葺葺?集?
ddddddddddddddddddddddddddddddd



开始解密acom/yy/hunter/servlet/UploaderServlet
27781ec819a6cca1c56f47da4faedf2c27781ec819a6cca1c56f47da4faed
f2c27781ec819a6cca1c56f47da4faedf2cSvl
class_data len=aaaaaaaaaaaaaaaaaaaaaaaaaaa
27781ec819a6cca1c56f47da4faedf2c27781ec819a6cca1c56f47da4faed
f2c27781ec819a6cca1c56f47da4faedf2c>SAt
bbbbbbbbbbbbbbbbbbbbbbbbb
360TOP1奢侈品360TOP1奢侈品360TOP1奢侈品hD?娌舞8?騿矓#
cccccccccccccccccccccccccccccc
@
BzC&T斘抴?360TOP1奢侈品360TOP1奢侈品hD?娌舞8?騿矓#葺葺葺葺葺葺?]闧b

ddddddddddddddddddddddddddddddd



正确的字串是27781ec819a6cca1c56f47da4faedf2c27781ec819a6cca1c56f
47da4faedf2c27781ec819a6cca1c56f47da4faedf2c
，但是每次都自动加了一些内容到这个字串后面。。。，不知道为什么，求解……

[taodm]

楼主是学java出身的？没听说过\0结束符？

[W170532934]

楼主搞java里面是不是没有字符串结束符这个概念啊？你需要注意下是不是有些地方使用memcpy等函数或者定义字符串的时候，最好有个'\0'。如果我说的不清楚，麻烦你自己去谷歌下C语言的字符串结束符

[pathuang68]

类似

char hex_data[1024];
//memset(hex_data, 0, 20); 为啥要注释这行呢？加上吧，同时把最后的20改为1024
memset(hex_data, 0, 1024);

其它与此相似的地方，均照此办理。

[wZi]

C语言里没有字符串这种数据类型。

于是规定用字符串的时候就是，一堆以'\0'结尾的字符。

[cbzjzsb123]

C语言里没有字符串这种数据类型。

于是规定用字符串的时候就是，一堆以'\0'结尾的字符。

[wsxxiaohao]

字符串结束符

[wangkunhong]

谢谢各位，明白啦^_^