c++实现加密和解密算法以及JNI技术的应用实例

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
#include "jiami.h"
 
#include "jni.h"
#include "com_test_start_CommonClassLoader.h"
 
 static void arraycopy(JNIEnv * env, jbyteArray sb, int spo, jbyteArray db,
                  int start, int len);
 
static jbyteArray encrypt(JNIEnv * env, jbyteArray b, jint len);
static jbyteArray getValidateCode(JNIEnv * env);
static jbyteArray getCode(JNIEnv * env);
 
/* * Clasbs:  com_test_start_CommonClassLoader
* Method:    defineClass0
* Signature: (Ljava/lang/String;[BII)Ljava/lang/Class;
*/
JNIEXPORT jclass JNICALL Java_com_test_start_CommonClassLoader_defineClass0(
        JNIEnv * env, jobject loader, jstring name, jbyteArray buffer,
        jint start, jint len) {
    jbyteArray temp = env - > NewByteArray(len); //new一个数组,并申请一块内存
    arraycopy(env, buffer, start, temp, start, len); //数组的复制相当于System.copy()方法
    jbyteArray byte0 = encrypt(env, temp, len); //进行class文件的解密操作
    if (byte0 == NULL) {
        env - > DeleteLocalRef(temp); //释放内存
        return NULL;
    }
    jsize size = env - > GetArrayLength(byte0); //技术数组的长度相当于Array的length属性
    jclass classLoader = env - >
                         GetSuperclass(env - >
                                       GetSuperclass(env - >
            GetSuperclass(env - > GetObjectClass(loader)))); //获取父类装载器
    jmethodID mid = env - >
                    GetMethodID(classLoader, "defineClass",
                                "(Ljava/lang/String;[BII)Ljava/lang/Class;"); //获取defineClass方法
    defineClass jclass cls = (jclass) env - >
                             CallObjectMethod(loader, mid, name, byte0, start,
                                              size); //调用Classloader的defineClass定义一个类到jvm中
    env - > DeleteLocalRef(byte0); //释放内存
    return cls;
}
/*
* Class:     com_test_start_CommonClassLoader
* Method:    defineClass1
* Signature: (Ljava/lang/String;[BIILjava/security/ProtectionDomain;)Ljava/lang/Class;
*/
JNIEXPORT jclass JNICALL Java_com_test_start_CommonClassLoader_defineClass1(
        JNIEnv * env, jobject loader, jstring name, jbyteArray buffer,
        jint start, jint len, jobject pro) {
    jbyteArray temp = env - > NewByteArray(len);
    arraycopy(env, buffer, start, temp, start, len);
    jbyteArray byte0 = encrypt(env, temp, len);
    if (byte0 == NULL) {
        env - > DeleteLocalRef(temp);
        return NULL;
    }
    jsize size = env - > GetArrayLength(byte0);
    jclass classLoader = env - >
                         GetSuperclass(env - >
                                       GetSuperclass(env - >
            GetSuperclass(env - > GetObjectClass(loader))));
    jmethodID mid = env - >
                    GetMethodID(classLoader, "defineClass",
                                "(Ljava/lang/String;[BIILjava/security/ProtectionDomain;)Ljava/lang/Class;");
    jclass cls = (jclass) env - >
                 CallObjectMethod(loader, mid, name, byte0, start, size, pro);
    env - > DeleteLocalRef(byte0);
    return cls;
}
/*   getCode,密钥,用于加密  */
static jbyteArray getCode(JNIEnv * env) {
    char char0[] = {‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘};
    char char1[] = {‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘i‘, ‘j‘, ‘k‘, ‘l‘,
                   ‘m‘, ‘n‘, ‘o‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘, ‘w‘, ‘s‘,
                   ‘y‘, ‘z‘
    };
    char char2[36];
    int i = 0;
    int j = 0;
    int k = 0;
    while (i < 36) {
        if (i >= 12 && j < 10) {
            char2[i] = char0[j];
            j++;
        } else if (i >= 23 && k < 26) {
            char2[i] = char1[k];
            k++;
        } else {
            char2[i] = char1[k];
            k++;
        }
        i++;
    }
    jbyteArray code = env - > NewByteArray(36);
    env - > SetByteArrayRegion(code, 0, 36, (jbyte * ) char2);
    return code;
}
/*   getValidateCode,验证码用于区分是否是加密文件  */
static jbyteArray getValidateCode(JNIEnv * env) {
    char char0[] = {‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘};
    jbyteArray char1 = env - > NewByteArray(8);
    env - > SetByteArrayRegion(char1, 0, 8, (jbyte * ) char0);
    return char1;
}
/*   encrypt,解密操作   */
static jbyteArray encrypt(JNIEnv * env, jbyteArray b, jint len) {
    int i = 0;
    jint j = 0;
    int k = len;
    jbyte * bb = (env - > GetByteArrayElements(b, JNI_FALSE));
    while (i < k) {
        j = bb[i];
        if ((j >= 48) && (j <= 57)) {
            j = (((j - 48) + 5) % 10) + 48;
        } else if ((j >= 65) && (j <= 90)) {
            j = (((j - 65) + 13) % 26) + 65;
        } else if ((j
                    >= 97) && (j <= 122)) {
            j = (((j - 97) + 13) % 26) + 97;
        }
        bb[i] = (jbyte) j;
        i++;
    }
    env - > SetByteArrayRegion(b, 0, k, bb);
    int length = 500; //长度
    int start = 0; //起始次数
    jbyteArray temp = getCode(env); //密钥
    int mode = (k - 8) % (length + 36); //剩余部分
    int count = (k - 8) / (length + 36); //总次数
    int spo = 0; //源位置
    int dpo = 0; //目标位置
    int size = count * length + mode; //大小
    jbyteArray byte0 = env - > NewByteArray(size); //密文大小
    if (count > 0) { //进行解密
        while (start < count) {
            arraycopy(env, b, spo, byte0, dpo, length);
            spo = spo + length + 36;
            dpo = dpo + length;
            start++;
        }
    }
    if (mode > 0) { //复制剩余部分
        arraycopy(env, b, spo, byte0, dpo, mode);
        spo = spo + mode;
    } //校验码
    jbyteArray validateCode0 = getValidateCode(env);
    jbyte *
            validateCode = env - >
                           GetByteArrayElements(validateCode0, JNI_FALSE);
    jbyteArray validate0 = env - > NewByteArray(8);
    arraycopy(env, b, spo, validate0, 0, 8);
    jbyte * validate = env - > GetByteArrayElements(validate0, JNI_FALSE);
    for (int index = 0; index < 8; index++) { //校验解码是否成功
        if (validate[index] != validateCode[index]) {
            return NULL;
        }
    }
    env - > DeleteLocalRef(validate0);
    env - > DeleteLocalRef(validateCode0);
    env - > DeleteLocalRef(temp);
    return byte0;
}
/*    decrypt,加密操作    */
static jbyteArray decrypt(JNIEnv * env, jbyteArray b, jboolean end) {
    int length = 500; //长度
    int start = 0; //起始次数
    int count = env - > GetArrayLength(b) / length; //总次数
    jbyteArray temp = getCode(env); //密钥
    int spo = 0; //源位置
    int dpo = 0; //目标位置
    int mode = env - > GetArrayLength(b) % length; //剩余部分
    int size = count * (length + 36) + mode; //大小
    if (end == JNI_TRUE) { //是否结束
        size = size + 8;
    }
    jbyteArray byte0 = env - > NewByteArray(size); //密文大小
    if (count > 0) { //进行加密
        while (start < count) {
            arraycopy(env, b, spo, byte0, dpo, length);
            arraycopy(env, temp, 0, byte0, dpo + length, 36);
            spo = spo + length;
            dpo = dpo + length + 36;
            start++;
        }
    }
    if (mode > 0) { //复制剩余部分
        arraycopy(env, b, spo, byte0, dpo, mode);
        dpo = dpo + mode;
    }
    if (end == JNI_TRUE) { //结束位置加校验码
        jbyteArray validateCode = getValidateCode(env);
        arraycopy(env, validateCode, 0, byte0, dpo, 8);
        env - > DeleteLocalRef(validateCode);
    }
    jbyte * byte1 = env - > GetByteArrayElements(byte0, 0); //转换字节位置
    int i = 0;
    int j = 0;
    int k = size;
    while (i < k) {
        j = byte1[i];
        if ((j >= 48) && (j <= 57)) {
            j = (((j - 48) + 5) % 10) + 48;
        } else if ((j >= 65) && (j <= 90)) {
            j = (((j - 65) + 13) % 26) + 65;
        } else if ((j >= 97) && (j <= 122)) {
            j = (((j - 97) + 13) % 26) + 97;
        }
        byte1[i] = (jbyte) j;
        i++;
    }
    env - > SetByteArrayRegion(byte0, 0, size, byte1);
    env - > DeleteLocalRef(temp);
    return byte0;
}
/*   arraycopy,自定义的数组赋值方法相当于System.copy()   */
static void arraycopy(JNIEnv * env, jbyteArray sb, int spo, jbyteArray db,
                      int start, int len) {
    jbyte * t = new jbyte[len];
    env - > GetByteArrayRegion(sb, spo, len, t);
    env - > SetByteArrayRegion(db, start, len, t);
    delete t;
}

  参考:http://blog.csdn.net/chenshuang_com/article/details/7681670

使用定制ClassLoader来对保护j2ee程序

http://www.ibm.com/developerworks/cn/java/l-protectjava/

c++实现加密和解密算法以及JNI技术的应用实例,布布扣,bubuko.com

c++实现加密和解密算法以及JNI技术的应用实例

上一篇:第五届蓝桥杯练习题 - 入门练习Java解题代码


下一篇:Java基础