mirror of
http://galexander.org/git/simplesshd.git
synced 2024-11-27 17:58:13 +00:00
21 lines
865 B
Plaintext
21 lines
865 B
Plaintext
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?
|