the following two functions are taken from the website:
http://vader.eeng.brad.ac.uk/tea/source.shtml
they implement the Tiny Encryption Algorithm (TEA)
void encipher(unsigned long *const v,unsigned long *const w,
const unsigned long *const k)
{
register unsigned long y=v[0],z=v[1],sum=0,delta=
0x9E3779B9,
a=k[0],b=k[1],c=k[2],d=k[3],n=32;
while(n-->0)
{
sum += delta;
y += (z << 4)+a ^ z+sum ^ (z >> 5)+b;
z += (y << 4)+c ^ y+sum ^ (y >> 5)+d;
}
w[0]=y; w[1]=z;
}
void decipher(unsigned long *const v,unsigned long *const w,
const unsigned long *const k)
{
register unsigned long y=v[0],z=v[1],sum=0xC6EF3720,
delta=0x9E3779B9,a=k[0],b=k[1],
c=k[2],d=k[3],n=32;
/* sum = delta<<5, in general sum = delta * n */
while(n-->0)
{
z -= (y << 4)+c ^ y+sum ^ (y >> 5)+d;
y -= (z << 4)+a ^ z+sum ^ (z >> 5)+b;
sum -= delta;
}
w[0]=y; w[1]=z;
}
How would i use these functions to encrypt/decrypt a char* ? how can i convert char* to long* and will this do it? a simple typecast doesn't do it apparently.
thanks in advance
mf
Use the algorithm to get you an encrypted long. Then, convert the long into a string - by using another algorithm. Say, for each digit, substitute a character.