void RC2_ecb_encrypt(const unsigned char *in, unsigned char *out, RC2_KEY *ks,
int encrypt)
{
unsigned long l,d[2];
c2l(in,l); d[0]=l;
c2l(in,l); d[1]=l;
if (encrypt)
RC2_encrypt(d,ks);
else
RC2_decrypt(d,ks);
l=d[0]; l2c(l,out);
l=d[1]; l2c(l,out);
l=d[0]=d[1]=0;
}
void RC2_cbc_encrypt(unsigned char *in, unsigned char *out, long length,
RC2_KEY *ks, unsigned char *iv, int encrypt)
{
register unsigned long tin0,tin1;
register unsigned long tout0,tout1,xor0,xor1;
register 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;
RC2_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;
RC2_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;
RC2_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;
RC2_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;
}
