我编写了一个简单的字符串加密和解密，将字符串拆分为两个 var，并在字符串的左右交换之后增加 assci 代码。
当我加密这个文本=“这是测试”时，这很好用，但是当加密 utf 字符时，不要像这个字符串那样的词=“تست تست تست تست”
加密代码是：
JNIEXPORT jstring JNICALL Java_com_test_ndk_MainActivity_encrypt(JNIEnv* env, jobject thiz, jstring dec) {
const char *nativeString = (*env)->GetStringUTFChars(env, dec, 0);
char *newstr;
char *left;
char *right;
int decLenght = strlen(nativeString);
int middl = decLenght / 2;
int i;
newstr = substr(nativeString, 0, middl);
int lenght = strlen(newstr);
left = malloc(lenght);
for (i = 0; i < lenght; i++) {
left[i] = newstr[i] + 1;
}
left[lenght] = '\0';
newstr = substr(nativeString, middl, decLenght - middl);
lenght = strlen(newstr);
right = malloc(lenght);
for (i = 0; i < lenght; i++) {
right[i] = newstr[i] - 1;
}
right[lenght] = '\0';
strcat(right, left);
(*env)->ReleaseStringUTFChars(env, dec, nativeString);
return (*env)->NewStringUTF(env, right);
}
和解密代码是：
JNIEXPORT jstring JNICALL Java_com_test_ndk_MainActivity_decrypt(JNIEnv* env, jobject thiz, jstring enc) {
const char *nativeString = (*env)->GetStringUTFChars(env, enc, 0);
char *newstr;
char *left;
char *right;
int encLenght = strlen(nativeString);
int middl = encLenght / 2;
int i;
if (encLenght % 2 != 0) {
middl++;
}
newstr = substr(nativeString, 0, middl);
int lenght = strlen(newstr);
left = malloc(lenght);
for (i = 0; i < lenght; i++) {
left[i] = (char) ((int) newstr[i] + 1);
}
left[lenght] = '\0';
newstr = substr(nativeString, middl, encLenght - middl);
lenght = strlen(newstr);
right = malloc(lenght);
for (i = 0; i < lenght; i++) {
right[i] = (char) ((int) newstr[i] - 1);
}
right[lenght] = '\0';
strcat(right, left);
(*env)->ReleaseStringUTFChars(env, enc, nativeString);
return (*env)->NewStringUTF(env, right);
}
子函数：
char* substr(const char *source, unsigned int start, unsigned int end) {
return strndup(source + start, end);
}
有没有人有解决方案。