1libuecc is a very small generic-purpose Elliptic Curve Cryptography library 2compatible with Ed25519. 3 4Most documentation can be found as Doxygen comments in the ecc.h header 5file. You can use `make doxygen` after running CMake to create HTML 6documenation from it. 7 8There are two sets of functions converting between libuecc's internal point 9representation and coordinates or compressed representation. The functions 10ending with _ed25519 use the same representation as original Ed25519 11implementation and should be used by new software. The functions with the 12suffix _legacy are provided for compatiblity with libuecc version before 13v6. 14 15Ed25519 and the legacy representation are isomorphic, they use a Twisted 16Edwards Curve 17 18 ax^2 + y^2 = 1 + dx^2y^2 19 20over the prime field for p = 2^255 - 19. 21 22Ed25519 uses the parameters 23 24 a = -1 and 25 d = -(121665/121666), 26 27while the legacy curve has 28 29 a = 486664 30 d = 486660. 31