Merge remote-tracking branch 'yawning/feature16467_9663'

.gitignore

changes/feature16467

changes/feature9663

src/common/crypto.c

src/common/crypto_curve25519.c

src/common/crypto_curve25519.h

src/common/crypto_ed25519.c

src/common/crypto_ed25519.h

src/common/include.am

src/ext/README

src/ext/ed25519/donna/README.md

src/ext/ed25519/donna/README.tor

src/ext/ed25519/donna/curve25519-donna-32bit.h

src/ext/ed25519/donna/curve25519-donna-64bit.h

src/ext/ed25519/donna/curve25519-donna-helpers.h

src/ext/ed25519/donna/curve25519-donna-sse2.h

src/ext/ed25519/donna/ed25519-donna-32bit-sse2.h

src/ext/ed25519/donna/ed25519-donna-32bit-tables.h

src/ext/ed25519/donna/ed25519-donna-64bit-sse2.h

src/ext/ed25519/donna/ed25519-donna-64bit-tables.h