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#include "XXTEAUtil.h" | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include "xxtea.h" | |
XXTEAUtil *XXTEAUtil::s_instance = nullptr; | |
XXTEAUtil * XXTEAUtil::getInstance() | |
{ | |
if (!s_instance) | |
{ | |
s_instance = new XXTEAUtil; | |
} | |
return s_instance; | |
} | |
XXTEAUtil::XXTEAUtil() | |
: m_xxteaEnabled(false) | |
, m_xxteaKey(nullptr) | |
, m_xxteaKeyLen(0) | |
, m_xxteaSign(nullptr) | |
, m_xxteaSignLen(0) | |
{ | |
} | |
XXTEAUtil::~XXTEAUtil() | |
{ | |
if (m_xxteaKey) free(m_xxteaKey); | |
if (m_xxteaSign) free(m_xxteaSign); | |
} | |
void XXTEAUtil::setXXTEAKeyAndSign( const char *key, int keyLen, const char *sign, int signLen ) | |
{ | |
cleanupXXTEAKeyAndSign(); | |
if (key && keyLen && sign && signLen) | |
{ | |
m_xxteaKey = (char*)malloc(keyLen); | |
memcpy(m_xxteaKey, key, keyLen); | |
m_xxteaKeyLen = keyLen; | |
m_xxteaSign = (char*)malloc(signLen); | |
memcpy(m_xxteaSign, sign, signLen); | |
m_xxteaSignLen = signLen; | |
m_xxteaEnabled = true; | |
} | |
else | |
{ | |
m_xxteaEnabled = false; | |
} | |
} | |
void XXTEAUtil::cleanupXXTEAKeyAndSign( void ) | |
{ | |
if (m_xxteaKey) | |
{ | |
free(m_xxteaKey); | |
m_xxteaKey = NULL; | |
m_xxteaKeyLen = 0; | |
} | |
if (m_xxteaSign) | |
{ | |
free(m_xxteaSign); | |
m_xxteaSign = NULL; | |
m_xxteaSignLen = 0; | |
} | |
} | |
unsigned char * XXTEAUtil::decrypt( unsigned char *buffer, int size, int &outlen ) | |
{ | |
xxtea_long len = 0; | |
unsigned char *outbuffer = xxtea_decrypt(buffer + m_xxteaSignLen, | |
(xxtea_long)size - (xxtea_long)m_xxteaSignLen, | |
(unsigned char*)m_xxteaKey, | |
(xxtea_long)m_xxteaKeyLen, | |
&len); | |
outlen = (int)len; | |
return outbuffer; | |
} | |
bool XXTEAUtil::isXXTEA(unsigned char *data, int size) | |
{ | |
if (!m_xxteaEnabled || !data) | |
{ | |
return false; | |
} | |
bool bXXTEA = true; | |
for (unsigned int i = 0; bXXTEA && i < m_xxteaSignLen && i < size; ++i) | |
{ | |
bXXTEA = data[i] == m_xxteaSign[i]; | |
} | |
return bXXTEA; | |
} |