XIP4001C from Xiphera is a very compact Intellectual Property (IP) core designed for efficient key exchange using the X25519 protocol. XIP4001C implements arithmetic on Curve25519, and provides a security level of 128 bits. Curve25519 is used in numerous contemporary security protocols and applications, including TLS 1.3.

XIP4001C has been designed for easy integration with FPGA- and ASIC-based designs in a vendor-agnostic design methodology, and the functionality of XIP4001C does not rely on any FPGA manufacturer-specific features.