Operations on encrypted types

The TFHE library defines the following operations with FHE ciphertexts:

name	function name	symbol	type

NOTE 1: Random encrypted integers that are generated fully on-chain. Currently, implemented as a mockup by using a PRNG in the plain. Not for use in production!

NOTE 2: The shift operators TFHE.shr and TFHE.shl can take any encrypted type euintX as a first operand and either a uint8or a euint8 as a second operand, however the second operand will always be computed modulo the number of bits of the first operand. For example, TFHE.shr(euint64 x, 70) will actually be equal to TFHE.shr(euint64 x, 6) because 70 % 64 = 6. This is in contrast to the classical shift operators in Solidity where there is no intermediate modulo operation, so for instance any uint64 shifted right via >> would give a null result.

Overloaded operators +, -, *, &, ... on encrypted integers are supported (using for). As of now, overloaded operators will call the versions without an overflow check.

More information about the supported operations can be found in the function specifications page or in the TFHE-rs docs.

If you find yourself in search of a missing feature, we encourage you to consult our roadmap for upcoming developments. Alternatively, don't hesitate to reach out to us on Discord or visit our community forum.