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Patch out the XTS implementation in bsaes.

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We don't call it, so ship less code and reduce the number of places
where we must think about the bsaes -> aes_nohw fallback.

Bug: 256
Change-Id: I10ac2d70e18ec81e679631a9532c36d9edab1c6e
Reviewed-on: https://boringssl-review.googlesource.com/c/33586
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
This commit is contained in:
David Benjamin 2018-12-09 14:22:44 -06:00 committed by CQ bot account: commit-bot@chromium.org
parent fc30467f28
commit 3adb1e5a37
1 changed files with 10 additions and 1 deletions
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11
crypto/fipsmodule/aes/asm/bsaes-x86_64.pl
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@ -114,6 +114,7 @@ open OUT,"| \"$^X\" \"$xlate\" $flavour \"$output\"";
my ($inp,$out,$len,$key,$ivp)=("%rdi","%rsi","%rdx","%rcx");
my @XMM=map("%xmm$_",(15,0..14)); # best on Atom, +10% over (0..15)
my $ecb=0; # suppress unreferenced ECB subroutines, spare some space...
my $xts=0; # Also patch out the XTS subroutines.
{
my ($key,$rounds,$const)=("%rax","%r10d","%r11");
@ -2163,6 +2164,8 @@ ___
# const AES_KEY *key1, const AES_KEY *key2,
# const unsigned char iv[16]);
#
# We patch out the XTS implementation in BoringSSL.
if ($xts) {
my ($twmask,$twres,$twtmp)=@XMM[13..15];
$arg6=~s/d$//;
@ -2991,6 +2994,7 @@ $code.=<<___;
.size bsaes_xts_decrypt,.-bsaes_xts_decrypt
___
}
} # $xts
$code.=<<___;
.type _bsaes_const,\@object
.align 64
@ -3172,7 +3176,8 @@ $code.=<<___;
.rva .Lctr_enc_prologue
.rva .Lctr_enc_epilogue
.rva .Lctr_enc_info
___
$code.=<<___ if ($xts);
.rva .Lxts_enc_prologue
.rva .Lxts_enc_epilogue
.rva .Lxts_enc_info
@ -3180,6 +3185,8 @@ $code.=<<___;
.rva .Lxts_dec_prologue
.rva .Lxts_dec_epilogue
.rva .Lxts_dec_info
___
$code.=<<___;
.section .xdata
.align 8
@ -3211,6 +3218,8 @@ $code.=<<___;
.rva .Lctr_enc_body,.Lctr_enc_epilogue # HandlerData[]
.rva .Lctr_enc_tail
.long 0
___
$code.=<<___ if ($xts);
.Lxts_enc_info:
.byte 9,0,0,0
.rva se_handler