Mercurial > dropbear
view libtomcrypt/notes/tech0005.txt @ 665:4d9511f98462
fix out-of-tree cleaning
If we build out of tree and then run `make clean`, we hit an
infinite loop where libtommath tries to enter subdirs that don't
exist and run `make clean`.
author | Mike Frysinger <vapier@gentoo.org> |
---|---|
date | Sun, 08 Apr 2012 02:06:54 -0400 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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Tech Note 0005 Minimizing Code Space Tom St Denis Introduction ------------ Tweaking... You can disable whole classes of algorithms on the command line with the LTC_NO_* defines. From there you can manually turn on what you want to enable. The following build with GCC 3.4.4 on an AMD64 box gets you AES, CTR mode, SHA-256, HMAC, Yarrow, full RSA PKCS #1, PKCS #5 and ASN.1 DER in roughly 40KB of code (49KB on the ARMv4) (both excluding the math library). CFLAGS="-DLTC_NO_CIPHERS -DLTC_NO_HASHES -DLTC_NO_PRNGS -DLTC_NO_MACS -DLTC_NO_MODES -DLTC_NO_PK -DRIJNDAEL -DLTC_CTR_MODE -DSHA256 \ -DLTC_HMAC -DYARROW -DMRSA -DMPI -DTFM_DESC -DARGTYPE=3 -Os -DLTC_SMALL_CODE -fomit-frame-pointer" make IGNORE_SPEED=1 Obviously this won't get you performance but if you need to pack a crypto lib in a device with limited means it's more than enough... Neato eh?