tree d314bd548681430ec52497ddf68b001680e843a7
parent 0e21f41fe884bedf708d3d4d6ab2ce9f53712bb8
author David Benjamin <davidben@google.com> 1460841001 -0400
committer David Benjamin <davidben@google.com> 1461089798 +0000

Reimplement PKCS#12 key derivation.

This is avoids pulling in BIGNUM for doing a straight-forward addition on a
block-sized value, and avoids a ton of mallocs. It's also -Wconversion-clean,
unlike the old one.

In doing so, this replaces the HMAC_MAX_MD_CBLOCK with EVP_MAX_MD_BLOCK_SIZE.
By having the maximum block size available, most of the temporary values in the
key derivation don't need to be malloc'd.

BUG=22

Change-Id: I940a62bba4ea32bf82b1190098f3bf185d4cc7fe
Reviewed-on: https://boringssl-review.googlesource.com/7688
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>