Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add [email protected] and [email protected] algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes

ifeq ($V,1)
silent=
silent_stdout=
else
silent=@
silent_stdout= > /dev/null
endif

#Files left over from making the crypt.pdf.
LEFTOVERS=*.dvi *.log *.aux *.toc *.idx *.ilg *.ind *.out *.lof

#build the doxy files (requires Doxygen, tetex and patience)
.PHONY: doxygen
doxygen:
	doxygen $(silent_stdout)

patched_doxygen:
	(cat Doxyfile && echo "HAVE_DOT=no") | doxygen - $(silent_stdout)

doxy: patched_doxygen
	${MAKE} -C doxygen/latex $(silent_stdout) && mv -f doxygen/latex/refman.pdf .
	@echo The huge doxygen PDF should be available as doc/refman.pdf

#This builds the crypt.pdf file. Note that the rm -f *.pdf has been removed
#from the clean command! This is because most people would like to keep the
#nice pre-compiled crypt.pdf that comes with libtomcrypt! We only need to
#delete it if we are rebuilding it.
docs crypt.pdf: crypt.tex
	rm -f crypt.pdf $(LEFTOVERS)
	cp crypt.tex crypt.bak
	touch -r crypt.tex crypt.bak
	(printf "%s" "\def\fixedpdfdate{"; date +'D:%Y%m%d%H%M%S%:z' -d @$$(stat --format=%Y crypt.tex) | sed "s/:\([0-9][0-9]\)$$/'\1'}/g") > crypt-deterministic.tex
	printf "%s\n" "\pdfinfo{" >> crypt-deterministic.tex
	printf "%s\n" "  /CreationDate (\fixedpdfdate)" >> crypt-deterministic.tex
	printf "%s\n}\n" "  /ModDate (\fixedpdfdate)" >> crypt-deterministic.tex
	cat crypt.tex >> crypt-deterministic.tex
	mv crypt-deterministic.tex crypt.tex
	touch -r crypt.bak crypt.tex
	echo "hello" > crypt.ind
	latex crypt $(silent_stdout)
	latex crypt $(silent_stdout)
	makeindex crypt.idx $(silent_stdout)
	perl ../helper.pl --fixupind crypt.ind
	pdflatex crypt $(silent_stdout)
	sed -b -i 's,^/ID \[.*\]$$,/ID [<0> <0>],g' crypt.pdf
	mv crypt.bak crypt.tex
	rm -f $(LEFTOVERS)

docdvi: crypt.tex
	echo hello > crypt.ind
	latex crypt $(silent_stdout)
	latex crypt $(silent_stdout)
	makeindex crypt.idx
	perl ../helper.pl --fixupind crypt.ind
	latex crypt $(silent_stdout)
	latex crypt $(silent_stdout)

termdoc: docdvi
	dvi2tty crypt.dvi -w120

clean:
	rm -f $(LEFTOVERS)
	rm -rf doxygen/