\ crypto region based allocation
\ Copyright (C) 2014 Bernd Paysan
\ This program is free software: you can redistribute it and/or modify
\ it under the terms of the GNU Affero General Public License as published by
\ the Free Software Foundation, either version 3 of the License, or
\ (at your option) any later version.
\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\ GNU Affero General Public License for more details.
\ You should have received a copy of the GNU Affero General Public License
\ along with this program. If not, see <http://www.gnu.org/licenses/>.
2Variable kregion \ current region pointer + remainder
Variable kfree64' \ free list for 64 bytes keys
$4000 Constant /kregion
: kalloc ( len -- addr ) >r
\G allocate a len byte block of non-swappable stuff
r@ /kregion u> !!kr-size!!
kregion 2@ dup r@ u< IF
2drop /kregion alloc+lock /kregion 2dup kregion 2! THEN
over swap r> safe/string kregion 2! ;
\ fixed size secrets are assumed to be all 64 bytes long
\ if they are just 32 bytes, the second half is all zero
: kalloc64 ( -- addr )
kfree64' @ ?dup-if dup @ kfree64' ! dup off exit then
64 kalloc ;
: kfree64 ( addr -- )
dup 64 erase kfree64' @ over ! kfree64' ! ;
: kalloc64? ( addr -- addr' )
dup @ IF @ EXIT THEN drop kalloc64 ;
32 buffer: zero32
: sec! ( addr1 u1 addr2 -- )
>r r@ kalloc64? dup r> ! swap $40 umin move ;
: sec@ ( addr -- addr1 u1 )
@ dup IF $40 over $20 + $20 zero32 over str= IF 2/ THEN
ELSE 0 THEN ;
: sec-off ( addr -- ) >r r@ @ ?dup-IF kfree64 THEN r> off ;
: sec+[]! ( addr1 u1 addr2 -- ) >r
0 { w^ sec } sec sec! sec cell r> $+! ;
: sec[]@ ( i addr -- addr u ) $[] sec@ ;
storage class end-class crypto-alloc
:noname ( len -- addr ) kalloc ; crypto-alloc to :allocate
\ we never free these classes, they are per-task temporary storages
crypto-alloc ' new static-a with-allocater Constant crypto-a