R^2 mod N - CypherCalc

CypherCalc can compute the Montgomery parameter R² mod n. In this context, R is the next power of 2 greater than n. That is, R = 2^k, where k is the length of the modulus in bits. Some applications use R² mod n to quickly convert numbers into their Montgomery images.

Here's the procedure:

From the "Tools" menu, click "Find R^2 mod n...".
Enter the desired modulus into the "Modulus (n)" box. You can either type this number, drag it from another CypherCalc window, or paste it from another application. The modulus n must be odd.
Click the "Compute" button. CypherCalc will compute R² mod n and display the result in the "R^2 mod n" box.