# remains z/Architecture specific. On z990 it was measured to perform
# 2x better than code generated by gcc 4.3.
+# December 2010.
+#
+# Add support for z196 "cipher message with counter" instruction.
+# Note however that it's disengaged, because it was measured to
+# perform ~12% worse than vanilla km-based code...
+
+# February 2011.
+#
+# Add AES_xts_[en|de]crypt. This includes support for z196
+# km-xts-aes instructions, which deliver ~70% improvement at 8KB
+# block size over vanilla km-based code.
+
$flavour = shift;
if ($flavour =~ /3[12]/) {
.type _s390x_AES_encrypt,\@function
.align 16
_s390x_AES_encrypt:
- st${g} $ra,`$stdframe-$SIZE_T`($sp)
+ st${g} $ra,15*$SIZE_T($sp)
x $s0,0($key)
x $s1,4($key)
x $s2,8($key)
or $s2,$i3
or $s3,$t3
- l${g} $ra,`$stdframe-$SIZE_T`($sp)
+ l${g} $ra,15*$SIZE_T($sp)
xr $s0,$t0
xr $s1,$t2
x $s2,24($key)
.type _s390x_AES_decrypt,\@function
.align 16
_s390x_AES_decrypt:
- st${g} $ra,`$stdframe-$SIZE_T`($sp)
+ st${g} $ra,15*$SIZE_T($sp)
x $s0,0($key)
x $s1,4($key)
x $s2,8($key)
nr $i1,$mask
nr $i2,$mask
- l${g} $ra,`$stdframe-$SIZE_T`($sp)
+ l${g} $ra,15*$SIZE_T($sp)
or $s1,$t1
l $t0,16($key)
l $t1,20($key)
.size AES_set_decrypt_key,.-AES_set_decrypt_key
___
-#void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
+########################################################################
+# void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
# size_t length, const AES_KEY *key,
# unsigned char *ivec, const int enc)
{
.size AES_cbc_encrypt,.-AES_cbc_encrypt
___
}
-#void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
+########################################################################
+# void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
# size_t blocks, const AES_KEY *key,
# const unsigned char *ivec)
{
my $inp="%r2";
-my $out="%r3";
-my $len="%r4";
+my $out="%r4"; # blocks and out are swapped
+my $len="%r3";
my $key="%r5"; my $iv0="%r5";
my $ivp="%r6";
my $fp ="%r7";
.type AES_ctr32_encrypt,\@function
.align 16
AES_ctr32_encrypt:
+ xgr %r3,%r4 # flip %r3 and %r4, $out and $len
+ xgr %r4,%r3
+ xgr %r3,%r4
llgfr $len,$len # safe in ctr32 subroutine even in 64-bit case
___
$code.=<<___ if (!$softonly);
st${g} $fp,$SIZE_T($sp)
slgr $len,$fp
- brc 1,.Lctr32_hw_loop # not zero, no borrow
+ brc 1,.Lctr32_hw_switch # not zero, no borrow
algr $fp,$len # input is shorter than allocated buffer
lghi $len,0
st${g} $fp,$SIZE_T($sp)
-.Lctr32_hw_loop:
+.Lctr32_hw_switch:
+___
+$code.=<<___ if (0); ######### kmctr code was measured to be ~12% slower
+ larl $s0,OPENSSL_s390xcap_P
+ lg $s0,8($s0)
+ tmhh $s0,0x0004 # check for message_security-assist-4
+ jz .Lctr32_km_loop
+
+ llgfr $s0,%r0
+ lgr $s1,%r1
+ lghi %r0,0
+ la %r1,16($sp)
+ .long 0xb92d2042 # kmctr %r4,%r2,%r2
+
+ llihh %r0,0x8000 # check if kmctr supports the function code
+ srlg %r0,%r0,0($s0)
+ ng %r0,16($sp)
+ lgr %r0,$s0
+ lgr %r1,$s1
+ jz .Lctr32_km_loop
+
+####### kmctr code
+ algr $out,$inp # restore $out
+ lgr $s1,$len # $s1 undertakes $len
+ j .Lctr32_kmctr_loop
+.align 16
+.Lctr32_kmctr_loop:
+ la $s2,16($sp)
+ lgr $s3,$fp
+.Lctr32_kmctr_prepare:
+ stg $iv0,0($s2)
+ stg $ivp,8($s2)
+ la $s2,16($s2)
+ ahi $ivp,1 # 32-bit increment, preserves upper half
+ brct $s3,.Lctr32_kmctr_prepare
+
+ #la $inp,0($inp) # inp
+ sllg $len,$fp,4 # len
+ #la $out,0($out) # out
+ la $s2,16($sp) # iv
+ .long 0xb92da042 # kmctr $out,$s2,$inp
+ brc 1,.-4 # pay attention to "partial completion"
+
+ slgr $s1,$fp
+ brc 1,.Lctr32_kmctr_loop # not zero, no borrow
+ algr $fp,$s1
+ lghi $s1,0
+ brc 4+1,.Lctr32_kmctr_loop # not zero
+
+ l${g} $sp,0($sp)
+ lm${g} %r6,$s3,6*$SIZE_T($sp)
+ br $ra
+.align 16
+___
+$code.=<<___;
+.Lctr32_km_loop:
la $s2,16($sp)
lgr $s3,$fp
-.Lctr32_hw_prepare:
+.Lctr32_km_prepare:
stg $iv0,0($s2)
stg $ivp,8($s2)
la $s2,16($s2)
ahi $ivp,1 # 32-bit increment, preserves upper half
- brct $s3,.Lctr32_hw_prepare
+ brct $s3,.Lctr32_km_prepare
la $s0,16($sp) # inp
sllg $s1,$fp,4 # len
la $s2,16($sp)
lgr $s3,$fp
slgr $s2,$inp
-.Lctr32_hw_xor:
+.Lctr32_km_xor:
lg $s0,0($inp)
lg $s1,8($inp)
xg $s0,0($s2,$inp)
stg $s0,0($out,$inp)
stg $s1,8($out,$inp)
la $inp,16($inp)
- brct $s3,.Lctr32_hw_xor
+ brct $s3,.Lctr32_km_xor
slgr $len,$fp
- brc 1,.Lctr32_hw_loop # not zero, no borrow
+ brc 1,.Lctr32_km_loop # not zero, no borrow
algr $fp,$len
lghi $len,0
- brc 4+1,.Lctr32_hw_loop # not zero
+ brc 4+1,.Lctr32_km_loop # not zero
l${g} $s0,0($sp)
l${g} $s1,$SIZE_T($sp)
la $s2,16($sp)
-.Lctr32_hw_zap:
+.Lctr32_km_zap:
stg $s0,0($s2)
stg $s0,8($s2)
la $s2,16($s2)
- brct $s1,.Lctr32_hw_zap
+ brct $s1,.Lctr32_km_zap
la $sp,0($s0)
lm${g} %r6,$s3,6*$SIZE_T($sp)
___
$code.=<<___;
stm${g} $key,$ra,5*$SIZE_T($sp)
- sl${g}r $out,$inp
+ sl${g}r $inp,$out
larl $tbl,AES_Te
llgf $t1,12($ivp)
.Lctr32_loop:
- stm${g} $inp,$len,2*$SIZE_T($sp)
+ stm${g} $inp,$out,2*$SIZE_T($sp)
llgf $s0,0($ivp)
llgf $s1,4($ivp)
llgf $s2,8($ivp)
lm${g} $inp,$ivp,2*$SIZE_T($sp)
llgf $t1,16*$SIZE_T($sp)
- x $s0,0($inp)
+ x $s0,0($inp,$out)
+ x $s1,4($inp,$out)
+ x $s2,8($inp,$out)
+ x $s3,12($inp,$out)
+ stm $s0,$s3,0($out)
+
+ la $out,16($out)
+ ahi $t1,1 # 32-bit increment
+ brct $len,.Lctr32_loop
+
+ lm${g} %r6,$ra,6*$SIZE_T($sp)
+ br $ra
+.size AES_ctr32_encrypt,.-AES_ctr32_encrypt
+___
+}
+
+########################################################################
+# void AES_xts_encrypt(const char *inp,char *out,size_t len,
+# const AES_KEY *key1, const AES_KEY *key2,u64 secno);
+#
+{
+my $inp="%r2";
+my $out="%r4"; # len and out are swapped
+my $len="%r3";
+my $key1="%r5"; # $i1
+my $key2="%r6"; # $i2
+my $fp="%r7"; # $i3
+my $tweak=16*$SIZE_T+16; # or $stdframe-16, bottom of the frame...
+
+$code.=<<___;
+.type _s390x_xts_km,\@function
+.align 16
+_s390x_xts_km:
+___
+$code.=<<___ if(0);
+ llgfr $s0,%r0 # put aside the function code
+ lghi $s1,0x7f
+ nr $s1,%r0
+ lghi %r0,0 # query capability vector
+ la %r1,2*$SIZE_T($sp)
+ .long 0xb92e0042 # km %r4,%r2
+ llihh %r1,0x8000
+ srlg %r1,%r1,32($s1) # check for 32+function code
+ ng %r1,2*$SIZE_T($sp)
+ lgr %r0,$s0 # restore the function code
+ la %r1,0($key1) # restore $key1
+ jz .Lxts_km_vanilla
+
+ lmg $i2,$i3,$tweak($sp) # put aside the tweak value
+ algr $out,$inp
+
+ oill %r0,32 # switch to xts function code
+ aghi $s1,-18 #
+ sllg $s1,$s1,3 # (function code - 18)*8, 0 or 16
+ la %r1,$tweak-16($sp)
+ slgr %r1,$s1 # parameter block position
+ lmg $s0,$s3,0($key1) # load 256 bits of key material,
+ stmg $s0,$s3,0(%r1) # and copy it to parameter block.
+ # yes, it contains junk and overlaps
+ # with the tweak in 128-bit case.
+ # it's done to avoid conditional
+ # branch.
+ stmg $i2,$i3,$tweak($sp) # "re-seat" the tweak value
+
+ .long 0xb92e0042 # km %r4,%r2
+ brc 1,.-4 # pay attention to "partial completion"
+
+ lrvg $s0,$tweak+0($sp) # load the last tweak
+ lrvg $s1,$tweak+8($sp)
+ stmg %r0,%r3,$tweak-32(%r1) # wipe copy of the key
+
+ nill %r0,0xffdf # switch back to original function code
+ la %r1,0($key1) # restore pointer to $key1
+ slgr $out,$inp
+
+ llgc $len,2*$SIZE_T-1($sp)
+ nill $len,0x0f # $len%=16
+ br $ra
+
+.align 16
+.Lxts_km_vanilla:
+___
+$code.=<<___;
+ # prepare and allocate stack frame at the top of 4K page
+ # with 1K reserved for eventual signal handling
+ lghi $s0,-1024-256-16# guarantee at least 256-bytes buffer
+ lghi $s1,-4096
+ algr $s0,$sp
+ lgr $fp,$sp
+ ngr $s0,$s1 # align at page boundary
+ slgr $fp,$s0 # total buffer size
+ lgr $s2,$sp
+ lghi $s1,1024+16 # sl[g]fi is extended-immediate facility
+ slgr $fp,$s1 # deduct reservation to get usable buffer size
+ # buffer size is at lest 256 and at most 3072+256-16
+
+ la $sp,1024($s0) # alloca
+ nill $fp,0xfff0 # round to 16*n
+ st${g} $s2,0($sp) # back-chain
+ nill $len,0xfff0 # redundant
+ st${g} $fp,$SIZE_T($sp)
+
+ slgr $len,$fp
+ brc 1,.Lxts_km_go # not zero, no borrow
+ algr $fp,$len # input is shorter than allocated buffer
+ lghi $len,0
+ st${g} $fp,$SIZE_T($sp)
+
+.Lxts_km_go:
+ lrvg $s0,$tweak+0($s2) # load the tweak value in little-endian
+ lrvg $s1,$tweak+8($s2)
+
+ la $s2,16($sp) # vector of ascending tweak values
+ slgr $s2,$inp
+ srlg $s3,$fp,4
+ j .Lxts_km_start
+
+.Lxts_km_loop:
+ la $s2,16($sp)
+ slgr $s2,$inp
+ srlg $s3,$fp,4
+.Lxts_km_prepare:
+ lghi $i1,0x87
+ srag $i2,$s1,63 # broadcast upper bit
+ ngr $i1,$i2 # rem
+ srlg $i2,$s0,63 # carry bit from lower half
+ sllg $s0,$s0,1
+ sllg $s1,$s1,1
+ xgr $s0,$i1
+ ogr $s1,$i2
+.Lxts_km_start:
+ lrvgr $i1,$s0 # flip byte order
+ lrvgr $i2,$s1
+ stg $i1,0($s2,$inp)
+ stg $i2,8($s2,$inp)
+ xg $i1,0($inp)
+ xg $i2,8($inp)
+ stg $i1,0($out,$inp)
+ stg $i2,8($out,$inp)
+ la $inp,16($inp)
+ brct $s3,.Lxts_km_prepare
+
+ slgr $inp,$fp # rewind $inp
+ la $s2,0($out,$inp)
+ lgr $s3,$fp
+ .long 0xb92e00aa # km $s2,$s2
+ brc 1,.-4 # pay attention to "partial completion"
+
+ la $s2,16($sp)
+ slgr $s2,$inp
+ srlg $s3,$fp,4
+.Lxts_km_xor:
+ lg $i1,0($out,$inp)
+ lg $i2,8($out,$inp)
+ xg $i1,0($s2,$inp)
+ xg $i2,8($s2,$inp)
+ stg $i1,0($out,$inp)
+ stg $i2,8($out,$inp)
+ la $inp,16($inp)
+ brct $s3,.Lxts_km_xor
+
+ slgr $len,$fp
+ brc 1,.Lxts_km_loop # not zero, no borrow
+ algr $fp,$len
+ lghi $len,0
+ brc 4+1,.Lxts_km_loop # not zero
+
+ l${g} $i1,0($sp) # back-chain
+ llgf $fp,`2*$SIZE_T-4`($sp) # bytes used
+ la $i2,16($sp)
+ srlg $fp,$fp,4
+.Lxts_km_zap:
+ stg $i1,0($i2)
+ stg $i1,8($i2)
+ la $i2,16($i2)
+ brct $fp,.Lxts_km_zap
+
+ la $sp,0($i1)
+ llgc $len,2*$SIZE_T-1($i1)
+ nill $len,0x0f # $len%=16
+ bzr $ra
+
+ # generate one more tweak...
+ lghi $i1,0x87
+ srag $i2,$s1,63 # broadcast upper bit
+ ngr $i1,$i2 # rem
+ srlg $i2,$s0,63 # carry bit from lower half
+ sllg $s0,$s0,1
+ sllg $s1,$s1,1
+ xgr $s0,$i1
+ ogr $s1,$i2
+
+ ltr $len,$len # clear zero flag
+ br $ra
+.size _s390x_xts_km,.-_s390x_xts_km
+
+.globl AES_xts_encrypt
+.type AES_xts_encrypt,\@function
+.align 16
+AES_xts_encrypt:
+ xgr %r3,%r4 # flip %r3 and %r4, $out and $len
+ xgr %r4,%r3
+ xgr %r3,%r4
+___
+$code.=<<___ if ($SIZE_T==4);
+ llgfr $len,$len
+___
+$code.=<<___;
+ st${g} $len,1*$SIZE_T($sp) # save copy of $len
+ srag $len,$len,4 # formally wrong, because it expands
+ # sign byte, but who can afford asking
+ # to process more than 2^63-1 bytes?
+ # I use it, because it sets condition
+ # code...
+ bcr 8,$ra # abort if zero (i.e. less than 16)
+___
+$code.=<<___ if (!$softonly);
+ llgf %r0,240($key2)
+ lhi %r1,16
+ clr %r0,%r1
+ jl .Lxts_enc_software
+
+ stm${g} %r6,$s3,6*$SIZE_T($sp)
+ st${g} $ra,14*$SIZE_T($sp)
+
+ sllg $len,$len,4 # $len&=~15
+ slgr $out,$inp
+
+ lrvg $s0,$stdframe($sp) # load secno
+ lghi $s1,0
+ la $s2,$tweak($sp)
+ lghi $s3,16
+ stmg $s0,$s1,0($s2)
+ la %r1,0($key2) # $key2 is not needed anymore
+ .long 0xb92e00aa # km $s2,$s2, generate the tweak
+ brc 1,.-4 # can this happen?
+
+ l %r0,240($key1)
+ la %r1,0($key1) # $key1 is not needed anymore
+ bras $ra,_s390x_xts_km
+ jz .Lxts_enc_km_done
+
+ aghi $inp,-16 # take one step back
+ la $i3,0($out,$inp) # put aside real $out
+.Lxts_enc_km_steal:
+ llgc $i1,16($inp)
+ llgc $i2,0($out,$inp)
+ stc $i1,0($out,$inp)
+ stc $i2,16($out,$inp)
+ la $inp,1($inp)
+ brct $len,.Lxts_enc_km_steal
+
+ la $s2,0($i3)
+ lghi $s3,16
+ lrvgr $i1,$s0 # flip byte order
+ lrvgr $i2,$s1
+ xg $i1,0($s2)
+ xg $i2,8($s2)
+ stg $i1,0($s2)
+ stg $i2,8($s2)
+ .long 0xb92e00aa # km $s2,$s2
+ brc 1,.-4 # can this happen?
+ lrvgr $i1,$s0 # flip byte order
+ lrvgr $i2,$s1
+ xg $i1,0($i3)
+ xg $i2,8($i3)
+ stg $i1,0($i3)
+ stg $i2,8($i3)
+
+.Lxts_enc_km_done:
+ l${g} $ra,14*$SIZE_T($sp)
+ st${g} $sp,$tweak($sp) # wipe tweak
+ st${g} $sp,$tweak($sp)
+ lm${g} %r6,$s3,6*$SIZE_T($sp)
+ br $ra
+.align 16
+.Lxts_enc_software:
+___
+$code.=<<___;
+ stm${g} %r6,$ra,6*$SIZE_T($sp)
+
+ slgr $out,$inp
+
+ xgr $s0,$s0 # clear upper half
+ xgr $s1,$s1
+ lrv $s0,$stdframe+4($sp) # load secno
+ lrv $s1,$stdframe+0($sp)
+ xgr $s2,$s2
+ xgr $s3,$s3
+ stm${g} %r2,%r5,2*$SIZE_T($sp)
+ la $key,0($key2)
+ larl $tbl,AES_Te
+ bras $ra,_s390x_AES_encrypt # generate the tweak
+ lm${g} %r2,%r5,2*$SIZE_T($sp)
+ stm $s0,$s3,$tweak($sp) # save the tweak
+ j .Lxts_enc_enter
+
+.align 16
+.Lxts_enc_loop:
+ lrvg $s1,$tweak+0($sp) # load the tweak in little-endian
+ lrvg $s3,$tweak+8($sp)
+ lghi %r1,0x87
+ srag %r0,$s3,63 # broadcast upper bit
+ ngr %r1,%r0 # rem
+ srlg %r0,$s1,63 # carry bit from lower half
+ sllg $s1,$s1,1
+ sllg $s3,$s3,1
+ xgr $s1,%r1
+ ogr $s3,%r0
+ lrvgr $s1,$s1 # flip byte order
+ lrvgr $s3,$s3
+ srlg $s0,$s1,32 # smash the tweak to 4x32-bits
+ stg $s1,$tweak+0($sp) # save the tweak
+ llgfr $s1,$s1
+ srlg $s2,$s3,32
+ stg $s3,$tweak+8($sp)
+ llgfr $s3,$s3
+ la $inp,16($inp) # $inp+=16
+.Lxts_enc_enter:
+ x $s0,0($inp) # ^=*($inp)
x $s1,4($inp)
x $s2,8($inp)
x $s3,12($inp)
+ stm${g} %r2,%r3,2*$SIZE_T($sp) # only two registers are changing
+ la $key,0($key1)
+ bras $ra,_s390x_AES_encrypt
+ lm${g} %r2,%r5,2*$SIZE_T($sp)
+ x $s0,$tweak+0($sp) # ^=tweak
+ x $s1,$tweak+4($sp)
+ x $s2,$tweak+8($sp)
+ x $s3,$tweak+12($sp)
st $s0,0($out,$inp)
st $s1,4($out,$inp)
st $s2,8($out,$inp)
st $s3,12($out,$inp)
+ brct${g} $len,.Lxts_enc_loop
+
+ llgc $len,`2*$SIZE_T-1`($sp)
+ nill $len,0x0f # $len%16
+ jz .Lxts_enc_done
+
+ la $i3,0($inp,$out) # put aside real $out
+.Lxts_enc_steal:
+ llgc %r0,16($inp)
+ llgc %r1,0($out,$inp)
+ stc %r0,0($out,$inp)
+ stc %r1,16($out,$inp)
+ la $inp,1($inp)
+ brct $len,.Lxts_enc_steal
+ la $out,0($i3) # restore real $out
+
+ # generate last tweak...
+ lrvg $s1,$tweak+0($sp) # load the tweak in little-endian
+ lrvg $s3,$tweak+8($sp)
+ lghi %r1,0x87
+ srag %r0,$s3,63 # broadcast upper bit
+ ngr %r1,%r0 # rem
+ srlg %r0,$s1,63 # carry bit from lower half
+ sllg $s1,$s1,1
+ sllg $s3,$s3,1
+ xgr $s1,%r1
+ ogr $s3,%r0
+ lrvgr $s1,$s1 # flip byte order
+ lrvgr $s3,$s3
+ srlg $s0,$s1,32 # smash the tweak to 4x32-bits
+ stg $s1,$tweak+0($sp) # save the tweak
+ llgfr $s1,$s1
+ srlg $s2,$s3,32
+ stg $s3,$tweak+8($sp)
+ llgfr $s3,$s3
+
+ x $s0,0($out) # ^=*(inp)|stolen cipther-text
+ x $s1,4($out)
+ x $s2,8($out)
+ x $s3,12($out)
+ st${g} $out,4*$SIZE_T($sp)
+ la $key,0($key1)
+ bras $ra,_s390x_AES_encrypt
+ l${g} $out,4*$SIZE_T($sp)
+ x $s0,`$tweak+0`($sp) # ^=tweak
+ x $s1,`$tweak+4`($sp)
+ x $s2,`$tweak+8`($sp)
+ x $s3,`$tweak+12`($sp)
+ st $s0,0($out)
+ st $s1,4($out)
+ st $s2,8($out)
+ st $s3,12($out)
+
+.Lxts_enc_done:
+ stg $sp,$tweak+0($sp) # wipe tweak
+ stg $sp,$twesk+8($sp)
+ lm${g} %r6,$ra,6*$SIZE_T($sp)
+ br $ra
+.size AES_xts_encrypt,.-AES_xts_encrypt
+___
+# void AES_xts_decrypt(const char *inp,char *out,size_t len,
+# const AES_KEY *key1, const AES_KEY *key2,u64 secno);
+#
+$code.=<<___;
+.globl AES_xts_decrypt
+.type AES_xts_decrypt,\@function
+.align 16
+AES_xts_decrypt:
+ xgr %r3,%r4 # flip %r3 and %r4, $out and $len
+ xgr %r4,%r3
+ xgr %r3,%r4
+___
+$code.=<<___ if ($SIZE_T==4);
+ llgfr $len,$len
+___
+$code.=<<___;
+ st${g} $len,1*$SIZE_T($sp) # save copy of $len
+ aghi $len,-16
+ bcr 4,$ra # abort if less than zero. formally
+ # wrong, because $len is unsigned,
+ # but who can afford asking to
+ # process more than 2^63-1 bytes?
+ tmll $len,0x0f
+ jnz .Lxts_dec_proceed
+ aghi $len,16
+.Lxts_dec_proceed:
+___
+$code.=<<___ if (!$softonly);
+ llgf %r0,240($key2)
+ lhi %r1,16
+ clr %r0,%r1
+ jl .Lxts_dec_software
+ stm${g} %r6,$s3,6*$SIZE_T($sp)
+ st${g} $ra,14*$SIZE_T($sp)
+
+ nill $len,0xfff0 # $len&=~15
+ slgr $out,$inp
+
+ # generate the tweak value
+ lrvg $s0,$stdframe($sp) # load secno
+ lghi $s1,0
+ la $s2,$tweak($sp)
+ lghi $s3,16
+ stg $s0,0($s2)
+ stg $s1,8($s2)
+ la %r1,0($key2) # $key2 is not needed past this point
+ .long 0xb92e00aa # km $s2,$s2, generate the tweak
+ brc 1,.-4 # can this happen?
+
+ l %r0,240($key1)
+ la %r1,0($key1) # $key1 is not needed anymore
+
+ ltgr $len,$len
+ jz .Lxts_dec_km_short
+ bras $ra,_s390x_xts_km
+ jz .Lxts_dec_km_done
+
+ lrvgr $s2,$s0 # make copy in reverse byte order
+ lrvgr $s3,$s1
+ j .Lxts_dec_km_2ndtweak
+
+.Lxts_dec_km_short:
+ llgc $len,`2*$SIZE_T-1`($sp)
+ nill $len,0x0f # $len%=16
+ lrvg $s0,$tweak+0($sp) # load the tweak
+ lrvg $s1,$tweak+8($sp)
+ lrvgr $s2,$s0 # make copy in reverse byte order
+ lrvgr $s3,$s1
+
+.Lxts_dec_km_2ndtweak:
+ lghi $i1,0x87
+ srag $i2,$s1,63 # broadcast upper bit
+ ngr $i1,$i2 # rem
+ srlg $i2,$s0,63 # carry bit from lower half
+ sllg $s0,$s0,1
+ sllg $s1,$s1,1
+ xgr $s0,$i1
+ ogr $s1,$i2
+ lrvgr $i1,$s0 # flip byte order
+ lrvgr $i2,$s1
+
+ xg $i1,0($inp)
+ xg $i2,8($inp)
+ stg $i1,0($out,$inp)
+ stg $i2,8($out,$inp)
+ la $i2,0($out,$inp)
+ lghi $i3,16
+ .long 0xb92e0066 # km $i2,$i2
+ brc 1,.-4 # can this happen?
+ lrvgr $i1,$s0
+ lrvgr $i2,$s1
+ xg $i1,0($out,$inp)
+ xg $i2,8($out,$inp)
+ stg $i1,0($out,$inp)
+ stg $i2,8($out,$inp)
+
+ la $i3,0($out,$inp) # put aside real $out
+.Lxts_dec_km_steal:
+ llgc $i1,16($inp)
+ llgc $i2,0($out,$inp)
+ stc $i1,0($out,$inp)
+ stc $i2,16($out,$inp)
+ la $inp,1($inp)
+ brct $len,.Lxts_dec_km_steal
+
+ lgr $s0,$s2
+ lgr $s1,$s3
+ xg $s0,0($i3)
+ xg $s1,8($i3)
+ stg $s0,0($i3)
+ stg $s1,8($i3)
+ la $s0,0($i3)
+ lghi $s1,16
+ .long 0xb92e0088 # km $s0,$s0
+ brc 1,.-4 # can this happen?
+ xg $s2,0($i3)
+ xg $s3,8($i3)
+ stg $s2,0($i3)
+ stg $s3,8($i3)
+.Lxts_dec_km_done:
+ l${g} $ra,14*$SIZE_T($sp)
+ st${g} $sp,$tweak($sp) # wipe tweak
+ st${g} $sp,$tweak($sp)
+ lm${g} %r6,$s3,6*$SIZE_T($sp)
+ br $ra
+.align 16
+.Lxts_dec_software:
+___
+$code.=<<___;
+ stm${g} %r6,$ra,6*$SIZE_T($sp)
+
+ srlg $len,$len,4
+ slgr $out,$inp
+
+ xgr $s0,$s0 # clear upper half
+ xgr $s1,$s1
+ lrv $s0,$stdframe+4($sp) # load secno
+ lrv $s1,$stdframe+0($sp)
+ xgr $s2,$s2
+ xgr $s3,$s3
+ stm${g} %r2,%r5,2*$SIZE_T($sp)
+ la $key,0($key2)
+ larl $tbl,AES_Te
+ bras $ra,_s390x_AES_encrypt # generate the tweak
+ lm${g} %r2,%r5,2*$SIZE_T($sp)
+ larl $tbl,AES_Td
+ lt${g}r $len,$len
+ stm $s0,$s3,$tweak($sp) # save the tweak
+ jz .Lxts_dec_short
+ j .Lxts_dec_enter
+
+.align 16
+.Lxts_dec_loop:
+ lrvg $s1,$tweak+0($sp) # load the tweak in little-endian
+ lrvg $s3,$tweak+8($sp)
+ lghi %r1,0x87
+ srag %r0,$s3,63 # broadcast upper bit
+ ngr %r1,%r0 # rem
+ srlg %r0,$s1,63 # carry bit from lower half
+ sllg $s1,$s1,1
+ sllg $s3,$s3,1
+ xgr $s1,%r1
+ ogr $s3,%r0
+ lrvgr $s1,$s1 # flip byte order
+ lrvgr $s3,$s3
+ srlg $s0,$s1,32 # smash the tweak to 4x32-bits
+ stg $s1,$tweak+0($sp) # save the tweak
+ llgfr $s1,$s1
+ srlg $s2,$s3,32
+ stg $s3,$tweak+8($sp)
+ llgfr $s3,$s3
+.Lxts_dec_enter:
+ x $s0,0($inp) # tweak^=*(inp)
+ x $s1,4($inp)
+ x $s2,8($inp)
+ x $s3,12($inp)
+ stm${g} %r2,%r3,2*$SIZE_T($sp) # only two registers are changing
+ la $key,0($key1)
+ bras $ra,_s390x_AES_decrypt
+ lm${g} %r2,%r5,2*$SIZE_T($sp)
+ x $s0,$tweak+0($sp) # ^=tweak
+ x $s1,$tweak+4($sp)
+ x $s2,$tweak+8($sp)
+ x $s3,$tweak+12($sp)
+ st $s0,0($out,$inp)
+ st $s1,4($out,$inp)
+ st $s2,8($out,$inp)
+ st $s3,12($out,$inp)
la $inp,16($inp)
- ahi $t1,1 # 32-bit increment
- brct $len,.Lctr32_loop
+ brct${g} $len,.Lxts_dec_loop
+
+ llgc $len,`2*$SIZE_T-1`($sp)
+ nill $len,0x0f # $len%16
+ jz .Lxts_dec_done
+
+ # generate pair of tweaks...
+ lrvg $s1,$tweak+0($sp) # load the tweak in little-endian
+ lrvg $s3,$tweak+8($sp)
+ lghi %r1,0x87
+ srag %r0,$s3,63 # broadcast upper bit
+ ngr %r1,%r0 # rem
+ srlg %r0,$s1,63 # carry bit from lower half
+ sllg $s1,$s1,1
+ sllg $s3,$s3,1
+ xgr $s1,%r1
+ ogr $s3,%r0
+ lrvgr $i2,$s1 # flip byte order
+ lrvgr $i3,$s3
+ stmg $i2,$i3,$tweak($sp) # save the 1st tweak
+ j .Lxts_dec_2ndtweak
+
+.align 16
+.Lxts_dec_short:
+ llgc $len,`2*$SIZE_T-1`($sp)
+ nill $len,0x0f # $len%16
+ lrvg $s1,$tweak+0($sp) # load the tweak in little-endian
+ lrvg $s3,$tweak+8($sp)
+.Lxts_dec_2ndtweak:
+ lghi %r1,0x87
+ srag %r0,$s3,63 # broadcast upper bit
+ ngr %r1,%r0 # rem
+ srlg %r0,$s1,63 # carry bit from lower half
+ sllg $s1,$s1,1
+ sllg $s3,$s3,1
+ xgr $s1,%r1
+ ogr $s3,%r0
+ lrvgr $s1,$s1 # flip byte order
+ lrvgr $s3,$s3
+ srlg $s0,$s1,32 # smash the tweak to 4x32-bits
+ stg $s1,$tweak-16+0($sp) # save the 2nd tweak
+ llgfr $s1,$s1
+ srlg $s2,$s3,32
+ stg $s3,$tweak-16+8($sp)
+ llgfr $s3,$s3
+
+ x $s0,0($inp) # tweak_the_2nd^=*(inp)
+ x $s1,4($inp)
+ x $s2,8($inp)
+ x $s3,12($inp)
+ stm${g} %r2,%r3,2*$SIZE_T($sp)
+ la $key,0($key1)
+ bras $ra,_s390x_AES_decrypt
+ lm${g} %r2,%r5,2*$SIZE_T($sp)
+ x $s0,$tweak-16+0($sp) # ^=tweak_the_2nd
+ x $s1,$tweak-16+4($sp)
+ x $s2,$tweak-16+8($sp)
+ x $s3,$tweak-16+12($sp)
+ st $s0,0($out,$inp)
+ st $s1,4($out,$inp)
+ st $s2,8($out,$inp)
+ st $s3,12($out,$inp)
+ la $i3,0($out,$inp) # put aside real $out
+.Lxts_dec_steal:
+ llgc %r0,16($inp)
+ llgc %r1,0($out,$inp)
+ stc %r0,0($out,$inp)
+ stc %r1,16($out,$inp)
+ la $inp,1($inp)
+ brct $len,.Lxts_dec_steal
+ la $out,0($i3) # restore real $out
+
+ lm $s0,$s3,$tweak($sp) # load the 1st tweak
+ x $s0,0($out) # tweak^=*(inp)|stolen cipher-text
+ x $s1,4($out)
+ x $s2,8($out)
+ x $s3,12($out)
+ st${g} $out,4*$SIZE_T($sp)
+ la $key,0($key1)
+ bras $ra,_s390x_AES_decrypt
+ l${g} $out,4*$SIZE_T($sp)
+ x $s0,$tweak+0($sp) # ^=tweak
+ x $s1,$tweak+4($sp)
+ x $s2,$tweak+8($sp)
+ x $s3,$tweak+12($sp)
+ st $s0,0($out)
+ st $s1,4($out)
+ st $s2,8($out)
+ st $s3,12($out)
+ stg $sp,$tweak-16+0($sp) # wipe 2nd tweak
+ stg $sp,$tweak-16+8($sp)
+.Lxts_dec_done:
+ stg $sp,$tweak+0($sp) # wipe tweak
+ stg $sp,$twesk+8($sp)
lm${g} %r6,$ra,6*$SIZE_T($sp)
br $ra
-.size AES_ctr32_encrypt,.-AES_ctr32_encrypt
+.size AES_xts_decrypt,.-AES_xts_decrypt
___
}
$code.=<<___;
-.comm OPENSSL_s390xcap_P,16,8
.string "AES for s390x, CRYPTOGAMS by <appro\@openssl.org>"
+.comm OPENSSL_s390xcap_P,16,8
___
$code =~ s/\`([^\`]*)\`/eval $1/gem;
projects / oweals / openssl.git / commitdiff