int CEncrypt::encdec_rc5(unsigned char *data, unsigned int nLen, bool enc)
{
if ((0==data)||(!haveKey_rc5)) return -1;
unsigned int offset = 0;
if(nLen >= 8)
{
while (offset<=nLen-8)
{
RC5_32_INT d[2];
memcpy(d, data+offset, sizeof(d));
if (enc)
RC5_32_encrypt(d, &key_rc5);
else
RC5_32_decrypt(d, &key_rc5);
/*
if (enc)
RC5_32_encrypt((RC5_32_INT *)data+offset, key_rc5);
else
RC5_32_decrypt((RC5_32_INT *)data+offset, key_rc5);
*/
memcpy(data+offset, d, sizeof(d));
offset += sizeof(d);
}
}
return nLen-offset;
}
void RC5_32_ecb_encrypt(const unsigned char *in, unsigned char *out,
RC5_32_KEY *ks, int encrypt)
{
unsigned long l,d[2];
c2l(in,l); d[0]=l;
c2l(in,l); d[1]=l;
if (encrypt)
RC5_32_encrypt(d,ks);
else
RC5_32_decrypt(d,ks);
l=d[0]; l2c(l,out);
l=d[1]; l2c(l,out);
l=d[0]=d[1]=0;
}
SWORD Encrypt::encdec_rc5(BYTE *data,DWORD len,bool enc)
{
if(!data || !haveKey_rc5)
{
return -1;
}
DWORD offset = 0;
while(offset <= len)
{
RC5_32_INT d[2];
memcpy(d,dataoffset,sizeof(d));
if(enc)
{
RC5_32_encrypt(d,&key_rc5);
}
else
{
RC5_32_decrypt(d,&key_rc5);
}
memcpy(dataoffset,d,sizeof(d));
offset += sizeof(d);
}
return len - offset;
}
void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,
long length, RC5_32_KEY *ks, unsigned char *iv,
int encrypt)
{
unsigned long tin0,tin1;
unsigned long tout0,tout1,xor0,xor1;
long l=length;
unsigned long tin[2];
if (encrypt)
{
c2l(iv,tout0);
c2l(iv,tout1);
iv-=8;
for (l-=8; l>=0; l-=8)
{
c2l(in,tin0);
c2l(in,tin1);
tin0^=tout0;
tin1^=tout1;
tin[0]=tin0;
tin[1]=tin1;
RC5_32_encrypt(tin,ks);
tout0=tin[0];
l2c(tout0,out);
tout1=tin[1];
l2c(tout1,out);
}
if (l != -8)
{
c2ln(in,tin0,tin1,l+8);
tin0^=tout0;
tin1^=tout1;
tin[0]=tin0;
tin[1]=tin1;
RC5_32_encrypt(tin,ks);
tout0=tin[0];
l2c(tout0,out);
tout1=tin[1];
l2c(tout1,out);
}
l2c(tout0,iv);
l2c(tout1,iv);
}
else
{
c2l(iv,xor0);
c2l(iv,xor1);
iv-=8;
for (l-=8; l>=0; l-=8)
{
c2l(in,tin0);
tin[0]=tin0;
c2l(in,tin1);
tin[1]=tin1;
RC5_32_decrypt(tin,ks);
tout0=tin[0]^xor0;
tout1=tin[1]^xor1;
l2c(tout0,out);
l2c(tout1,out);
xor0=tin0;
xor1=tin1;
}
if (l != -8)
{
c2l(in,tin0);
tin[0]=tin0;
c2l(in,tin1);
tin[1]=tin1;
RC5_32_decrypt(tin,ks);
tout0=tin[0]^xor0;
tout1=tin[1]^xor1;
l2cn(tout0,tout1,out,l+8);
xor0=tin0;
xor1=tin1;
}
l2c(xor0,iv);
l2c(xor1,iv);
}
tin0=tin1=tout0=tout1=xor0=xor1=0;
tin[0]=tin[1]=0;
}
