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Alexey Dobriyan 51fc6dc8f9 crypto: sha512 - reduce stack usage to safe number 
For rounds 16--79, W[i] only depends on W[i - 2], W[i - 7], W[i - 15] and W[i - 16].
Consequently, keeping all W[80] array on stack is unnecessary,
only 16 values are really needed.

Using W[16] instead of W[80] greatly reduces stack usage
(~750 bytes to ~340 bytes on x86_64).

Line by line explanation:
* BLEND_OP
  array is "circular" now, all indexes have to be modulo 16.
  Round number is positive, so remainder operation should be
  without surprises.

* initial full message scheduling is trimmed to first 16 values which
  come from data block, the rest is calculated before it's needed.

* original loop body is unrolled version of new SHA512_0_15 and
  SHA512_16_79 macros, unrolling was done to not do explicit variable
  renaming. Otherwise it's the very same code after preprocessing.
  See sha1_transform() code which does the same trick.

Patch survives in-tree crypto test and original bugreport test
(ping flood with hmac(sha512).

See FIPS 180-2 for SHA-512 definition
http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-01-15 12:39:17 +11:00
..
async_tx crypto: add module.h to those files that are explicitly using it 2011-10-31 19:31:11 -04:00
ablkcipher.c crypto: Add userspace report for givcipher type algorithms 2011-10-21 14:24:05 +02:00
aead.c crypto: Add userspace report for nivaead type algorithms 2011-10-21 14:24:06 +02:00
aes_generic.c
af_alg.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
ahash.c crypto: Add userspace report for ahash type algorithms 2011-10-21 14:24:04 +02:00
algapi.c crypto: Unlink and free instances when deleted 2011-11-09 12:04:06 +08:00
algboss.c
algif_hash.c crypto: algif_hash - Handle initial af_alg_make_sg error correctly 2011-06-30 07:44:06 +08:00
algif_skcipher.c
ansi_cprng.c crypto: ansi_cprng - enforce key != seed in fips mode 2011-11-09 12:04:06 +08:00
anubis.c
api.c
arc4.c crypto: arc4 - Fixed coding style issues 2011-06-30 07:44:05 +08:00
authenc.c crypto: Use scatterwalk_crypto_chain 2010-12-02 14:47:16 +08:00
authencesn.c crypto: authencesn - Add algorithm to handle IPsec extended sequence numbers 2011-03-13 20:22:27 -07:00
blkcipher.c crypto: Add userspace report for blkcipher type algorithms 2011-10-21 14:24:05 +02:00
blowfish_common.c crypto: blowfish - split generic and common c code 2011-09-22 21:25:25 +10:00
blowfish_generic.c crypto: blowfish - rename C-version to blowfish_generic 2011-09-22 21:25:26 +10:00
camellia.c
cast5.c
cast6.c
cbc.c
ccm.c
chainiv.c
cipher.c
compress.c
crc32c.c crypto: crc32c - Fixed coding style issue 2011-06-30 07:44:05 +08:00
cryptd.c crypto: cryptd - Use subsys_initcall to prevent races with aesni 2011-08-20 16:08:03 +08:00
crypto_null.c
crypto_user.c crypto: Unlink and free instances when deleted 2011-11-09 12:04:06 +08:00
crypto_wq.c crypto: add module.h to those files that are explicitly using it 2011-10-31 19:31:11 -04:00
ctr.c
cts.c
deflate.c net+crypto: Use vmalloc for zlib inflate buffers. 2011-06-29 05:48:41 -07:00
des_generic.c
ecb.c
eseqiv.c crypto: Use scatterwalk_crypto_chain 2010-12-02 14:47:16 +08:00
fcrypt.c
fips.c
gcm.c crypto: Use scatterwalk_crypto_chain 2010-12-02 14:47:16 +08:00
gf128mul.c crypto: gf128mul - fix call to memset() 2011-07-08 17:21:21 +08:00
ghash-generic.c crypto: ghash - Avoid null pointer dereference if no key is set 2011-10-21 13:18:42 +02:00
hmac.c
internal.h crypto: Export crypto_remove_final 2011-10-21 14:24:03 +02:00
Kconfig crypto: gf128mul - remove leftover "(EXPERIMENTAL)" in Kconfig 2011-12-20 15:20:08 +08:00
khazad.c
krng.c
lrw.c crypto: lrw - add interface for parallelized cipher implementions 2011-11-09 11:50:31 +08:00
lzo.c
Makefile crypto: serpent - rename serpent.c to serpent_generic.c 2011-11-30 16:12:44 +08:00
md4.c crypto: add module.h to those files that are explicitly using it 2011-10-31 19:31:11 -04:00
md5.c crypto: Move md5_transform to lib/md5.c 2011-08-06 18:32:45 -07:00
michael_mic.c
pcbc.c
pcompress.c crypto: Add userspace report for pcompress type algorithms 2011-10-21 14:24:06 +02:00
pcrypt.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2011-01-13 10:25:58 -08:00
proc.c crypto: add module.h to those files that are explicitly using it 2011-10-31 19:31:11 -04:00
ripemd.h
rmd128.c crypto: ripemd - Set module author and update email address 2011-01-04 23:34:03 +11:00
rmd160.c crypto: ripemd - Set module author and update email address 2011-01-04 23:34:03 +11:00
rmd256.c crypto: ripemd - Set module author and update email address 2011-01-04 23:34:03 +11:00
rmd320.c crypto: ripemd - Set module author and update email address 2011-01-04 23:34:03 +11:00
rng.c crypto: Add userspace report for rng type algorithms 2011-10-21 14:24:06 +02:00
salsa20_generic.c
scatterwalk.c
seed.c
seqiv.c
serpent_generic.c crypto: serpent - rename serpent.c to serpent_generic.c 2011-11-30 16:12:44 +08:00
sha1_generic.c crypto: sha1 - export sha1_update for reuse 2011-08-10 19:00:28 +08:00
sha256_generic.c
sha512_generic.c crypto: sha512 - reduce stack usage to safe number 2012-01-15 12:39:17 +11:00
shash.c crypto: Add userspace report for shash type algorithms 2011-10-21 14:24:04 +02:00
tcrypt.c crypto: tcrypt - add xts(twofish) tests 2011-11-09 11:57:56 +08:00
tcrypt.h crypto: tcrypt - add xts(serpent) tests 2011-11-09 11:57:56 +08:00
tea.c
testmgr.c crypto: serpent - add 8-way parallel x86_64/SSE2 assembler implementation 2011-11-21 16:13:23 +08:00
testmgr.h crypto: testmgr - add xts(twofish) test vectors 2011-11-09 11:57:56 +08:00
tgr192.c
twofish_common.c crypto: twofish-x86_64-3way - add lrw support 2011-11-09 11:53:32 +08:00
twofish_generic.c
vmac.c crypto: add module.h to those files that are explicitly using it 2011-10-31 19:31:11 -04:00
wp512.c crypto: whirlpool - count rounds from 0 2011-10-21 14:24:16 +02:00
xcbc.c crypto: add module.h to those files that are explicitly using it 2011-10-31 19:31:11 -04:00
xor.c
xts.c crypto: xts: add interface for parallelized cipher implementations 2011-11-09 11:56:06 +08:00
zlib.c net+crypto: Use vmalloc for zlib inflate buffers. 2011-06-29 05:48:41 -07:00