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Add encrypt and decrypt functions

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This commit is contained in:
yuanyuanxiang
2025-07-10 04:29:40 +08:00
parent 522e083d97
commit e4a1692a39
3 changed files with 148 additions and 16 deletions
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31
common/header.h
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@@ -2,20 +2,28 @@
// This file implements a serial of data header encoding methods.
#include <cstring>
#include <common/skCrypter.h>
#include "common/encfuncs.h"
#define MSG_HEADER "HELL"
enum HeaderEncType {
HeaderEncUnknown = -1,
HeaderEncNone,
HeaderEncV0,
HeaderEncV1,
HeaderEncV2,
HeaderEncV3,
HeaderEncV4,
HeaderEncV5,
HeaderEncV6,
HeaderEncNum,
};
// <20><><EFBFBD>ݱ<EFBFBD><DDB1><EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD><CABD><EFBFBD><EFBFBD>ʶ<EFBFBD><CAB6> + <20><><EFBFBD><EFBFBD><EFBFBD>󳤶<EFBFBD>(4<>ֽ<EFBFBD>) + <20><><EFBFBD><EFBFBD><EFBFBD>󳤶<EFBFBD>(4<>ֽ<EFBFBD>)
const int FLAG_COMPLEN = 4;
const int FLAG_LENGTH = 8;
const int HDR_LENGTH = FLAG_LENGTH + 2 * sizeof(unsigned int);
const int MIN_COMLEN = 8;
const int MIN_COMLEN = 12;
typedef void (*EncFun)(unsigned char* data, size_t length, unsigned char key);
typedef void (*DecFun)(unsigned char* data, size_t length, unsigned char key);
@@ -74,15 +82,8 @@ inline void decrypt(unsigned char* data, size_t length, unsigned char key) {
}
inline EncFun GetHeaderEncoder(HeaderEncType type) {
switch (type)
{
case HeaderEncNone:
return default_encrypt;
case HeaderEncV1:
return encrypt;
default:
return NULL;
}
static const DecFun methods[] = { default_encrypt, encrypt, encrypt_v1, encrypt_v2, encrypt_v3, encrypt_v4, encrypt_v5, encrypt_v6 };
return methods[type];
}
typedef struct HeaderFlag {
@@ -142,7 +143,7 @@ inline FlagType CheckHead(const char* flag, DecFun dec) {
else if (compare(flag, skCrypt("Shine"), 5, dec, 0) == 0) {
type = FLAG_SHINE;
}
else if (compare(flag, skCrypt("<<FUCK>>"), 8, dec, 0) == 0) {
else if (compare(flag, skCrypt("<<FUCK>>"), 8, dec, flag[9]) == 0) {
type = FLAG_FUCK;
}
else if (compare(flag, skCrypt("Hello?"), 6, dec, flag[6]) == 0) {
@@ -156,14 +157,14 @@ inline FlagType CheckHead(const char* flag, DecFun dec) {
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD>Զ<EFBFBD><D4B6>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><D4B1>ܼ<EFBFBD><DCBC><EFBFBD><EFBFBD>ϰ汾ͨѶЭ<D1B6><D0AD>
inline FlagType CheckHead(char* flag, HeaderEncType& funcHit) {
static const DecFun methods[] = { default_decrypt, decrypt };
static const DecFun methods[] = { default_decrypt, decrypt, decrypt_v1, decrypt_v2, decrypt_v3, decrypt_v4, decrypt_v5, decrypt_v6 };
static const int methodNum = sizeof(methods) / sizeof(DecFun);
char buffer[FLAG_LENGTH + 1] = {};
char buffer[MIN_COMLEN + 4] = {};
for (int i = 0; i < methodNum; ++i) {
memcpy(buffer, flag, FLAG_LENGTH);
memcpy(buffer, flag, MIN_COMLEN);
FlagType type = CheckHead(buffer, methods[i]);
if (type != FLAG_UNKNOWN) {
memcpy(flag, buffer, FLAG_LENGTH);
memcpy(flag, buffer, MIN_COMLEN);
funcHit = HeaderEncType(i);
return type;
}