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6 files changed

+112
-31
lines changed

6 files changed

+112
-31
lines changed

‎native/CMakeLists.txt‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -99,11 +99,11 @@ if (WIN32)
9999

100100
target_link_libraries(decrypt_test
101101
PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/native_decrypt_asm.obj
102-
)
102+
)
103103

104104
target_link_libraries(decrypt_test
105105
PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/native_encrypt_asm.obj
106-
)
106+
)
107107

108108
else ()
109109
MESSAGE("THIS IS LINUX")

‎native/encryptor.c‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -67,9 +67,8 @@ JNIEXPORT jbyteArray JNICALL Java_org_y4sec_encryptor_core_CodeEncryptor_encrypt
6767
}
6868

6969
jbyte *j_tea_key = (*env)->GetByteArrayElements(env, key, NULL);
70-
unsigned char *tea_key = (unsigned char *) malloc(17);
70+
unsigned char *tea_key = (unsigned char *) malloc(16);
7171
memcpy(tea_key, j_tea_key, 16);
72-
tea_key[17] = '\00';
7372
printf("KEY: %s\n", tea_key);
7473

7574
// {[10:14],[14:18]}

‎native/start.c‎

Lines changed: 9 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -14,19 +14,23 @@ unsigned char **split_string(const char *str, int *num_tokens, const char *sp) {
1414
char copy[100];
1515
char *token;
1616
int count = 0;
17-
strncpy(copy, str, sizeof(copy));
17+
18+
strncpy(copy, str, sizeof(copy) - 1);
1819
copy[sizeof(copy) - 1] = '\0';
20+
1921
token = strtok(copy, sp);
2022
while (token != NULL) {
2123
count++;
2224
token = strtok(NULL, sp);
2325
}
26+
2427
tokens = (unsigned char **) malloc(count * sizeof(unsigned char *));
2528
if (tokens == NULL) {
2629
fprintf(stderr, "memory allocation failed\n");
2730
return NULL;
2831
}
29-
strncpy(copy, str, sizeof(copy));
32+
33+
strncpy(copy, str, sizeof(copy) - 1);
3034
copy[sizeof(copy) - 1] = '\0';
3135

3236
token = strtok(copy, sp);
@@ -41,11 +45,13 @@ unsigned char **split_string(const char *str, int *num_tokens, const char *sp) {
4145
free(tokens);
4246
return NULL;
4347
}
44-
strcpy((char *) tokens[count], token);
48+
strncpy((char *) tokens[count], token, strlen(token) + 1);
4549
count++;
4650
token = strtok(NULL, sp);
4751
}
52+
4853
*num_tokens = count;
54+
4955
return tokens;
5056
}
5157

‎native/start_linux.c‎

Lines changed: 100 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -6,6 +6,54 @@
66

77
// PACKAGE
88
char *PACKAGE_NAME;
9+
// KEY
10+
char *KEY;
11+
12+
unsigned char **split_string(const char *str, int *num_tokens, const char *sp) {
13+
unsigned char **tokens = NULL;
14+
char copy[100];
15+
char *token;
16+
int count = 0;
17+
18+
strncpy(copy, str, sizeof(copy) - 1);
19+
copy[sizeof(copy) - 1] = '\0';
20+
21+
token = strtok(copy, sp);
22+
while (token != NULL) {
23+
count++;
24+
token = strtok(NULL, sp);
25+
}
26+
27+
tokens = (unsigned char **) malloc(count * sizeof(unsigned char *));
28+
if (tokens == NULL) {
29+
fprintf(stderr, "memory allocation failed\n");
30+
return NULL;
31+
}
32+
33+
strncpy(copy, str, sizeof(copy) - 1);
34+
copy[sizeof(copy) - 1] = '\0';
35+
36+
token = strtok(copy, sp);
37+
count = 0;
38+
while (token != NULL) {
39+
tokens[count] = (unsigned char *) malloc(strlen(token) + 1);
40+
if (tokens[count] == NULL) {
41+
fprintf(stderr, "memory allocation failed\n");
42+
for (int i = 0; i < count; i++) {
43+
free(tokens[i]);
44+
}
45+
free(tokens);
46+
return NULL;
47+
}
48+
strncpy((char *) tokens[count], token, strlen(token) + 1);
49+
count++;
50+
token = strtok(NULL, sp);
51+
}
52+
53+
*num_tokens = count;
54+
55+
return tokens;
56+
}
957

1058
void internal(unsigned char *_data, int start) {
1159
unsigned char first[4];
@@ -17,12 +65,20 @@ void internal(unsigned char *_data, int start) {
1765
second[i - start - 4] = _data[i];
1866
}
1967
uint32_t v[2] = {convert(first), convert(second)};
20-
// key: Y4Sec-Team-4ra1n
21-
// 59345365 632D5465 616D2D34 7261316E
68+
69+
printf("DECRYPT KEY: %s\n",KEY);
70+
unsigned char *key_part1 = (unsigned char *)KEY;
71+
unsigned char *key_part2 = (unsigned char *)KEY + 4;
72+
unsigned char *key_part3 = (unsigned char *)KEY + 8;
73+
unsigned char *key_part4 = (unsigned char *)KEY + 12;
74+
2275
uint32_t const k[4] = {
23-
(unsigned int) 0x65533459, (unsigned int) 0x65542d63,
24-
(unsigned int) 0X342d6d61, (unsigned int) 0x6e316172,
76+
(unsigned int) convert(key_part1),
77+
(unsigned int) convert(key_part2),
78+
(unsigned int) convert(key_part3),
79+
(unsigned int) convert(key_part4),
2580
};
81+
2682
tea_decrypt(v, k);
2783
unsigned char first_arr[4];
2884
unsigned char second_arr[4];
@@ -60,11 +116,11 @@ void JNICALL ClassDecryptHook(
60116
return;
61117
}
62118
// 1. {[10:14],[14:18]}
63-
internal(_data, 10);
119+
internal(_data,10);
64120
// 2. {[18:22],[22:26]}
65-
internal(_data, 18);
121+
internal(_data,18);
66122
// 3. {[26:30],[30:34]}
67-
internal(_data, 26);
123+
internal(_data,26);
68124
// 4. asm encrypt
69125
decrypt((unsigned char *) _data, class_data_len);
70126
} else {
@@ -81,9 +137,6 @@ JNIEXPORT void JNICALL Agent_OnUnload(JavaVM *vm) {
81137
JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *vm, char *options, void *reserved) {
82138
printf("PARAMS: %s\n", options);
83139

84-
const char *key = "PACKAGE_NAME";
85-
char *value = NULL;
86-
87140
// REPLACE . -> /
88141
char modified_str[256];
89142
size_t modified_str_size = sizeof(modified_str);
@@ -96,27 +149,50 @@ JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *vm, char *options, void *reserved) {
96149
}
97150
}
98151

99-
// SPLIT A=B -> B
100-
char *token = strtok(modified_str, "=");
101-
while (token != NULL) {
102-
if (strcmp(token, key) == 0) {
103-
value = strtok(NULL, "=");
104-
break;
152+
unsigned char *v1 = NULL;
153+
unsigned char *v2 = NULL;
154+
int num_tokens;
155+
unsigned char **tokens = split_string(modified_str, &num_tokens, ",");
156+
if (tokens != NULL) {
157+
unsigned char *pack = tokens[0];
158+
unsigned char *key = tokens[1];
159+
160+
tokens = split_string((char *) pack, &num_tokens, "=");
161+
if (strcmp((char *) tokens[0], "PACKAGE_NAME") == 0) {
162+
v1 = tokens[1];
163+
printf("PACKAGE_NAME: %s\n", v1);
164+
printf("LENGTH: %lu\n", strlen((char *) v1));
165+
PACKAGE_NAME = (char *) malloc(strlen((char *) v1));
166+
strcpy(PACKAGE_NAME, (char *)v1);
167+
printf("SET GLOBAL PACKAGE: %s\n",PACKAGE_NAME);
168+
}else{
169+
printf("ERROR");
170+
return 0;
171+
}
172+
173+
tokens = split_string((char *) key, &num_tokens, "=");
174+
if (strcmp((char *) tokens[0], "KEY") == 0) {
175+
v2 = tokens[1];
176+
printf("KEY: %s\n", v2);
177+
printf("LENGTH: %lu\n", strlen((char *) v2));
178+
KEY = (char *) malloc(strlen((char *) v2));
179+
strcpy(KEY, (char *)v2);
180+
printf("SET GLOBAL KEY: %s\n",KEY);
181+
} else{
182+
printf("ERROR");
183+
return 0;
105184
}
106-
token = strtok(NULL, "=");
107185
}
108186

109-
if (value == NULL) {
187+
if (v1 == NULL) {
110188
DE_LOG("NEED PACKAGE_NAME PARAMS\n");
111189
return 0;
112190
}
113191

114-
// SET PACKAGE_NAME
115-
PACKAGE_NAME = (char *) malloc(strlen(value) + 1);
116-
strcpy(PACKAGE_NAME, value);
117-
118-
printf("PACKAGE: %s\n", PACKAGE_NAME);
119-
printf("PACKAGE-LENGTH: %lu\n", strlen(PACKAGE_NAME));
192+
if (v2 == NULL) {
193+
DE_LOG("NEED KEY PARAMS\n");
194+
return 0;
195+
}
120196

121197
jvmtiEnv *jvmti;
122198
DE_LOG("INIT JVMTI ENVIRONMENT");

‎src/main/resources/libdecrypter.so‎

216 Bytes
Binary file not shown.

‎src/main/resources/libencryptor.so‎

0 Bytes
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