Implement the Tiny Encryption Algorithm (TEA). a. Use your TEA algorithm to encrypt the 64-bit plaintext block 0x0123456789ABCDEF using the 128-bit key 0xA56BABCD00000000FFFFFFFFABCDEF01 Decrypt the resulting ciphertext and verify that you obtain the original plaintext.
#define MX (z>>5^y<<2) + (y>>3^z<<4)^(sum^y) + (k[p&3^e]^z);
long btea(long* v, long n, long* k)
{
unsigned long z=v[n-1], y=v[0], sum=0, e, DELTA=0x9e3779b9;
long m, p, q ;
if (n > 1)
{
q = 6+52/n ;
while (q– > 0)
{
sum += DELTA;
e = sum >> 2&3 ;
for (p=0; p<n-1; p++) y = v[p+1], z = v[p] += MX;
y = v[0];
z = v[n-1] += MX;
}
return 0 ;
}
else if (n < -1)
{
n = -n ;
q = 6+52/n ;
sum = q*DELTA ;
while (sum != 0)
{
e = sum>>2 & 3;
for (p=n-1; p>0; p–) z = v[p-1], y = v[p] -= MX;
z = v[n-1];
y = v[0] -= MX;
sum -= DELTA;
}
return 0;
}
return 1;
}
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