I saw mask generation use case only once for constant time ternary operator in cryptography, but I use booleans regularly - your use case 4. In case of cryptogr

I saw mask generation use case only once for constant time ternary operator in cryptography, but I use booleans regularly - your use case 4. In case of cryptography it's x25519 algorithm, but the condition controlling the conditional swap is a bit extracted from the private key and the algorithm uses 255 bits of the key sequentially.