Here is a list of all documented files with brief descriptions:

[detail level 12345]

src
GENERATED
c
curve25519
decaf.c	Decaf high-level functions
eddsa.c
elligator.c	Elligator high-level functions
scalar.c	Decaf high-level functions
decaf
crypto.hxx
ed448goldilocks
decaf.c	Decaf high-level functions
eddsa.c
elligator.c	Elligator high-level functions
scalar.c	Decaf high-level functions
p25519
f_field.h	Field-specific code for 2^255 - 19
f_generic.c	Generic arithmetic which has to be compiled per field
p448
f_field.h	Field-specific code for 2^448 - 2^224 - 1
f_generic.c	Generic arithmetic which has to be compiled per field
include
decaf
common.h	Common utility headers for Decaf library
ed255.h	A group of prime order p, based on Curve25519
ed255.hxx
ed448.h	A group of prime order p, based on Ed448-Goldilocks
ed448.hxx
eddsa.hxx
point_255.h	A group of prime order p, based on Curve25519
point_255.hxx
point_448.h	A group of prime order p, based on Ed448-Goldilocks
point_448.hxx
secure_buffer.hxx	C++ self-zeroizing buffer
sha512.h
sha512.hxx	SHA512 instance, C++ wrapper
shake.h	SHA2-512
shake.hxx	SHA-3-n and SHAKE-n instances, C++ wrapper
spongerng.h	Sponge-based RNGs
spongerng.hxx	Sponge RNG instances, C++ wrapper
decaf.h
decaf.hxx