Here is a list of all files with brief descriptions:

anonymous.h
base64.c
callback.c
challenge.c
challenge.h
anonymous/client.c
cram-md5/client.c
digest-md5/client.c
external/client.c
gs2/client.c
gssapi/client.c
login/client.c
openid20/client.c
plain/client.c
saml20/client.c
scram/client.c
securid/client.c
cram-md5.h
crypto.c
digest-md5.h
digest.c
digest.h
digesthmac.c
digesthmac.h
done.c
doxygen.c
error.c
external.h
digest-md5/free.c
src/free.c
free.h
getsubopt.c
gs2.h
gs2helper.c
gs2helper.h
gsasl-mech.h
gsasl-version.h
gsasl.h
init.c
internal.h
listmech.c
login.h
md5pwd.c
anonymous/mechinfo.c
cram-md5/mechinfo.c
digest-md5/mechinfo.c
external/mechinfo.c
gs2/mechinfo.c
gssapi/mechinfo.c
login/mechinfo.c
ntlm/mechinfo.c
openid20/mechinfo.c
plain/mechinfo.c
saml20/mechinfo.c
scram/mechinfo.c
securid/mechinfo.c
mechname.c
mechtools.c
mechtools.h
nonascii.c
nonascii.h
ntlm.c
openid20.h
digest-md5/parser.c
scram/parser.c
digest-md5/parser.h
scram/parser.h
plain.h
digest-md5/printer.c
scram/printer.c
digest-md5/printer.h
scram/printer.h
property.c
qop.c
qop.h
register.c
saml20.h
saslprep.c
scram.h
securid.h
anonymous/server.c
cram-md5/server.c
digest-md5/server.c
external/server.c
gs2/server.c
gssapi/server.c
login/server.c
openid20/server.c
plain/server.c
saml20/server.c
scram/server.c
securid/server.c
session.c
session.h
suggest.c
supportp.c
test-parser.c
tokens.c
digest-md5/tokens.h
scram/tokens.h
tools.c
tools.h
digest-md5/validate.c
scram/validate.c
digest-md5/validate.h
scram/validate.h
version.c
x-gssapi.h
x-ntlm.h
xcode.c
xfinish.c
xstart.c
xstep.c