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Improve 386 portability of aes-586.pl.

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This commit is contained in:
Andy Polyakov 2006-09-18 19:13:15 +00:00
parent a53cdc5b08
commit 3a8012cbf2
1 changed files with 4 additions and 3 deletions
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7
crypto/aes/asm/aes-586.pl
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@ -117,8 +117,9 @@
# #
# Version 4.3 implements switch between compact and non-compact block # Version 4.3 implements switch between compact and non-compact block
# functions in AES_cbc_encrypt depending on how much data was asked # functions in AES_cbc_encrypt depending on how much data was asked
# to process in one stroke. # to be processed in one stroke.
# #
######################################################################
# Timing attacks are classified in two classes: synchronous when # Timing attacks are classified in two classes: synchronous when
# attacker consciously initiates cryptographic operation and collects # attacker consciously initiates cryptographic operation and collects
# timing data of various character afterwards, and asynchronous when # timing data of various character afterwards, and asynchronous when
@ -141,7 +142,7 @@
# timing. But note that *if* plain-text was concealed in such way that # timing. But note that *if* plain-text was concealed in such way that
# input to block function is distributed *uniformly*, then attack # input to block function is distributed *uniformly*, then attack
# wouldn't apply. Now note that some encryption modes, most notably # wouldn't apply. Now note that some encryption modes, most notably
# CBC, do masks the plain-text in this exact way [secure cipher output # CBC, do mask the plain-text in this exact way [secure cipher output
# is distributed uniformly]. Yes, one still might find input that # is distributed uniformly]. Yes, one still might find input that
# would reveal the information about given key, but if amount of # would reveal the information about given key, but if amount of
# candidate inputs to be tried is larger than amount of possible key # candidate inputs to be tried is larger than amount of possible key
@ -2459,7 +2460,7 @@ my $mark=&DWP(76+240,"esp"); # copy of aes_key->rounds
&pushf (); # kludge, never executed &pushf (); # kludge, never executed
&set_label("slow_enc_tail",16); &set_label("slow_enc_tail",16);
&emms (); &emms () if (!$x86only);
&mov ($key eq "edi"? $key:"",$s3); # load out to edi &mov ($key eq "edi"? $key:"",$s3); # load out to edi
&mov ($s1,16); &mov ($s1,16);
&sub ($s1,$s2); &sub ($s1,$s2);