XIP4003C from Xiphera is a very compact Intellectual Property (IP) core designed for efficient X25519 key exchange and Ed25519-based Edwards-curve Digital Signature Algorithm (EdDSA). XIP4003C 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.

XIP4003C has been designed for easy integration with FPGA- and ASIC-based designs in a vendor-agnostic design methodology, and the functionality of XIP4003C does not rely on any FPGA manufacturer-specific features.