+___
+
+$code.=<<___;
+# void AES_set_encrypt_key(const unsigned char *in, int bits,
+# AES_KEY *key) {
+.globl AES_set_encrypt_key
+.type AES_set_encrypt_key,\@function
+.align 16
+AES_set_encrypt_key:
+_s390x_AES_set_encrypt_key:
+ lghi $t0,0
+ cl${g}r $inp,$t0
+ je .Lminus1
+ cl${g}r $key,$t0
+ je .Lminus1
+
+ lghi $t0,128
+ clr $bits,$t0
+ je .Lproceed
+ lghi $t0,192
+ clr $bits,$t0
+ je .Lproceed
+ lghi $t0,256
+ clr $bits,$t0
+ je .Lproceed
+ lghi %r2,-2
+ br %r14
+
+.align 16
+.Lproceed:
+___
+$code.=<<___ if (!$softonly);
+ # convert bits to km code, [128,192,256]->[18,19,20]
+ lhi %r5,-128
+ lhi %r0,18
+ ar %r5,$bits
+ srl %r5,6
+ ar %r5,%r0
+
+ larl %r1,OPENSSL_s390xcap_P
+ lg %r0,0(%r1)
+ tmhl %r0,0x4000 # check for message-security assist
+ jz .Lekey_internal
+
+ lghi %r0,0 # query capability vector
+ la %r1,16($sp)
+ .long 0xb92f0042 # kmc %r4,%r2
+
+ llihh %r1,0x8000
+ srlg %r1,%r1,0(%r5)
+ ng %r1,16($sp)
+ jz .Lekey_internal
+
+ lmg %r0,%r1,0($inp) # just copy 128 bits...
+ stmg %r0,%r1,0($key)
+ lhi %r0,192
+ cr $bits,%r0
+ jl 1f
+ lg %r1,16($inp)
+ stg %r1,16($key)
+ je 1f
+ lg %r1,24($inp)
+ stg %r1,24($key)
+1: st $bits,236($key) # save bits [for debugging purposes]
+ lgr $t0,%r5
+ st %r5,240($key) # save km code
+ lghi %r2,0
+ br %r14
+___
+$code.=<<___;
+.align 16
+.Lekey_internal:
+ stm${g} %r4,%r13,4*$SIZE_T($sp) # all non-volatile regs and $key
+
+ larl $tbl,AES_Te+2048
+
+ llgf $s0,0($inp)
+ llgf $s1,4($inp)
+ llgf $s2,8($inp)
+ llgf $s3,12($inp)
+ st $s0,0($key)
+ st $s1,4($key)
+ st $s2,8($key)
+ st $s3,12($key)
+ lghi $t0,128
+ cr $bits,$t0
+ jne .Lnot128
+
+ llill $mask,0xff
+ lghi $t3,0 # i=0
+ lghi $rounds,10
+ st $rounds,240($key)
+
+ llgfr $t2,$s3 # temp=rk[3]
+ srlg $i1,$s3,8
+ srlg $i2,$s3,16
+ srlg $i3,$s3,24
+ nr $t2,$mask
+ nr $i1,$mask
+ nr $i2,$mask
+
+.align 16
+.L128_loop:
+ la $t2,0($t2,$tbl)
+ la $i1,0($i1,$tbl)
+ la $i2,0($i2,$tbl)
+ la $i3,0($i3,$tbl)
+ icm $t2,2,0($t2) # Te4[rk[3]>>0]<<8
+ icm $t2,4,0($i1) # Te4[rk[3]>>8]<<16
+ icm $t2,8,0($i2) # Te4[rk[3]>>16]<<24
+ icm $t2,1,0($i3) # Te4[rk[3]>>24]
+ x $t2,256($t3,$tbl) # rcon[i]
+ xr $s0,$t2 # rk[4]=rk[0]^...
+ xr $s1,$s0 # rk[5]=rk[1]^rk[4]
+ xr $s2,$s1 # rk[6]=rk[2]^rk[5]
+ xr $s3,$s2 # rk[7]=rk[3]^rk[6]
+
+ llgfr $t2,$s3 # temp=rk[3]
+ srlg $i1,$s3,8
+ srlg $i2,$s3,16
+ nr $t2,$mask
+ nr $i1,$mask
+ srlg $i3,$s3,24
+ nr $i2,$mask
+
+ st $s0,16($key)
+ st $s1,20($key)
+ st $s2,24($key)
+ st $s3,28($key)
+ la $key,16($key) # key+=4
+ la $t3,4($t3) # i++
+ brct $rounds,.L128_loop
+ lghi $t0,10
+ lghi %r2,0
+ lm${g} %r4,%r13,4*$SIZE_T($sp)
+ br $ra
+
+.align 16
+.Lnot128:
+ llgf $t0,16($inp)
+ llgf $t1,20($inp)
+ st $t0,16($key)
+ st $t1,20($key)
+ lghi $t0,192
+ cr $bits,$t0
+ jne .Lnot192
+
+ llill $mask,0xff
+ lghi $t3,0 # i=0
+ lghi $rounds,12
+ st $rounds,240($key)
+ lghi $rounds,8
+
+ srlg $i1,$t1,8
+ srlg $i2,$t1,16
+ srlg $i3,$t1,24
+ nr $t1,$mask
+ nr $i1,$mask
+ nr $i2,$mask
+
+.align 16
+.L192_loop:
+ la $t1,0($t1,$tbl)
+ la $i1,0($i1,$tbl)
+ la $i2,0($i2,$tbl)
+ la $i3,0($i3,$tbl)
+ icm $t1,2,0($t1) # Te4[rk[5]>>0]<<8
+ icm $t1,4,0($i1) # Te4[rk[5]>>8]<<16
+ icm $t1,8,0($i2) # Te4[rk[5]>>16]<<24
+ icm $t1,1,0($i3) # Te4[rk[5]>>24]
+ x $t1,256($t3,$tbl) # rcon[i]
+ xr $s0,$t1 # rk[6]=rk[0]^...
+ xr $s1,$s0 # rk[7]=rk[1]^rk[6]
+ xr $s2,$s1 # rk[8]=rk[2]^rk[7]
+ xr $s3,$s2 # rk[9]=rk[3]^rk[8]
+
+ st $s0,24($key)
+ st $s1,28($key)
+ st $s2,32($key)
+ st $s3,36($key)
+ brct $rounds,.L192_continue
+ lghi $t0,12
+ lghi %r2,0
+ lm${g} %r4,%r13,4*$SIZE_T($sp)
+ br $ra
+
+.align 16
+.L192_continue:
+ lgr $t1,$s3
+ x $t1,16($key) # rk[10]=rk[4]^rk[9]
+ st $t1,40($key)
+ x $t1,20($key) # rk[11]=rk[5]^rk[10]
+ st $t1,44($key)
+
+ srlg $i1,$t1,8
+ srlg $i2,$t1,16
+ srlg $i3,$t1,24
+ nr $t1,$mask
+ nr $i1,$mask
+ nr $i2,$mask
+
+ la $key,24($key) # key+=6
+ la $t3,4($t3) # i++
+ j .L192_loop
+
+.align 16
+.Lnot192:
+ llgf $t0,24($inp)
+ llgf $t1,28($inp)
+ st $t0,24($key)
+ st $t1,28($key)
+ llill $mask,0xff
+ lghi $t3,0 # i=0
+ lghi $rounds,14
+ st $rounds,240($key)
+ lghi $rounds,7
+
+ srlg $i1,$t1,8
+ srlg $i2,$t1,16
+ srlg $i3,$t1,24
+ nr $t1,$mask
+ nr $i1,$mask
+ nr $i2,$mask
+
+.align 16
+.L256_loop:
+ la $t1,0($t1,$tbl)
+ la $i1,0($i1,$tbl)
+ la $i2,0($i2,$tbl)
+ la $i3,0($i3,$tbl)
+ icm $t1,2,0($t1) # Te4[rk[7]>>0]<<8
+ icm $t1,4,0($i1) # Te4[rk[7]>>8]<<16
+ icm $t1,8,0($i2) # Te4[rk[7]>>16]<<24
+ icm $t1,1,0($i3) # Te4[rk[7]>>24]
+ x $t1,256($t3,$tbl) # rcon[i]
+ xr $s0,$t1 # rk[8]=rk[0]^...
+ xr $s1,$s0 # rk[9]=rk[1]^rk[8]
+ xr $s2,$s1 # rk[10]=rk[2]^rk[9]
+ xr $s3,$s2 # rk[11]=rk[3]^rk[10]
+ st $s0,32($key)
+ st $s1,36($key)
+ st $s2,40($key)
+ st $s3,44($key)
+ brct $rounds,.L256_continue
+ lghi $t0,14
+ lghi %r2,0
+ lm${g} %r4,%r13,4*$SIZE_T($sp)
+ br $ra
+
+.align 16
+.L256_continue:
+ lgr $t1,$s3 # temp=rk[11]
+ srlg $i1,$s3,8
+ srlg $i2,$s3,16
+ srlg $i3,$s3,24
+ nr $t1,$mask
+ nr $i1,$mask
+ nr $i2,$mask
+ la $t1,0($t1,$tbl)
+ la $i1,0($i1,$tbl)
+ la $i2,0($i2,$tbl)
+ la $i3,0($i3,$tbl)
+ llgc $t1,0($t1) # Te4[rk[11]>>0]
+ icm $t1,2,0($i1) # Te4[rk[11]>>8]<<8
+ icm $t1,4,0($i2) # Te4[rk[11]>>16]<<16
+ icm $t1,8,0($i3) # Te4[rk[11]>>24]<<24
+ x $t1,16($key) # rk[12]=rk[4]^...
+ st $t1,48($key)
+ x $t1,20($key) # rk[13]=rk[5]^rk[12]
+ st $t1,52($key)
+ x $t1,24($key) # rk[14]=rk[6]^rk[13]
+ st $t1,56($key)
+ x $t1,28($key) # rk[15]=rk[7]^rk[14]
+ st $t1,60($key)
+
+ srlg $i1,$t1,8
+ srlg $i2,$t1,16
+ srlg $i3,$t1,24
+ nr $t1,$mask
+ nr $i1,$mask
+ nr $i2,$mask
+
+ la $key,32($key) # key+=8
+ la $t3,4($t3) # i++
+ j .L256_loop
+
+.Lminus1:
+ lghi %r2,-1
+ br $ra
+.size AES_set_encrypt_key,.-AES_set_encrypt_key
+
+# void AES_set_decrypt_key(const unsigned char *in, int bits,
+# AES_KEY *key) {
+.globl AES_set_decrypt_key
+.type AES_set_decrypt_key,\@function
+.align 16
+AES_set_decrypt_key:
+ #st${g} $key,4*$SIZE_T($sp) # I rely on AES_set_encrypt_key to
+ st${g} $ra,14*$SIZE_T($sp) # save non-volatile registers and $key!
+ bras $ra,_s390x_AES_set_encrypt_key
+ #l${g} $key,4*$SIZE_T($sp)
+ l${g} $ra,14*$SIZE_T($sp)
+ ltgr %r2,%r2
+ bnzr $ra
+___
+$code.=<<___ if (!$softonly);
+ #l $t0,240($key)
+ lhi $t1,16
+ cr $t0,$t1
+ jl .Lgo
+ oill $t0,0x80 # set "decrypt" bit
+ st $t0,240($key)
+ br $ra
+___
+$code.=<<___;
+.align 16
+.Lgo: lgr $rounds,$t0 #llgf $rounds,240($key)
+ la $i1,0($key)
+ sllg $i2,$rounds,4
+ la $i2,0($i2,$key)
+ srl $rounds,1
+ lghi $t1,-16
+
+.align 16
+.Linv: lmg $s0,$s1,0($i1)
+ lmg $s2,$s3,0($i2)
+ stmg $s0,$s1,0($i2)
+ stmg $s2,$s3,0($i1)
+ la $i1,16($i1)
+ la $i2,0($t1,$i2)
+ brct $rounds,.Linv
+___
+$mask80=$i1;
+$mask1b=$i2;
+$maskfe=$i3;
+$code.=<<___;
+ llgf $rounds,240($key)
+ aghi $rounds,-1
+ sll $rounds,2 # (rounds-1)*4
+ llilh $mask80,0x8080
+ llilh $mask1b,0x1b1b
+ llilh $maskfe,0xfefe
+ oill $mask80,0x8080
+ oill $mask1b,0x1b1b
+ oill $maskfe,0xfefe
+
+.align 16
+.Lmix: l $s0,16($key) # tp1
+ lr $s1,$s0
+ ngr $s1,$mask80
+ srlg $t1,$s1,7
+ slr $s1,$t1
+ nr $s1,$mask1b
+ sllg $t1,$s0,1
+ nr $t1,$maskfe
+ xr $s1,$t1 # tp2
+
+ lr $s2,$s1
+ ngr $s2,$mask80
+ srlg $t1,$s2,7
+ slr $s2,$t1
+ nr $s2,$mask1b
+ sllg $t1,$s1,1
+ nr $t1,$maskfe
+ xr $s2,$t1 # tp4
+
+ lr $s3,$s2
+ ngr $s3,$mask80
+ srlg $t1,$s3,7
+ slr $s3,$t1
+ nr $s3,$mask1b
+ sllg $t1,$s2,1
+ nr $t1,$maskfe
+ xr $s3,$t1 # tp8
+
+ xr $s1,$s0 # tp2^tp1
+ xr $s2,$s0 # tp4^tp1
+ rll $s0,$s0,24 # = ROTATE(tp1,8)
+ xr $s2,$s3 # ^=tp8
+ xr $s0,$s1 # ^=tp2^tp1
+ xr $s1,$s3 # tp2^tp1^tp8
+ xr $s0,$s2 # ^=tp4^tp1^tp8
+ rll $s1,$s1,8
+ rll $s2,$s2,16
+ xr $s0,$s1 # ^= ROTATE(tp8^tp2^tp1,24)
+ rll $s3,$s3,24
+ xr $s0,$s2 # ^= ROTATE(tp8^tp4^tp1,16)
+ xr $s0,$s3 # ^= ROTATE(tp8,8)
+
+ st $s0,16($key)
+ la $key,4($key)
+ brct $rounds,.Lmix
+
+ lm${g} %r6,%r13,6*$SIZE_T($sp)# as was saved by AES_set_encrypt_key!
+ lghi %r2,0
+ br $ra
+.size AES_set_decrypt_key,.-AES_set_decrypt_key
+___
+
+########################################################################
+# void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
+# size_t length, const AES_KEY *key,
+# unsigned char *ivec, const int enc)
+{
+my $inp="%r2";
+my $out="%r4"; # length and out are swapped
+my $len="%r3";
+my $key="%r5";
+my $ivp="%r6";
+
+$code.=<<___;
+.globl AES_cbc_encrypt
+.type AES_cbc_encrypt,\@function
+.align 16
+AES_cbc_encrypt:
+ xgr %r3,%r4 # flip %r3 and %r4, out and len
+ xgr %r4,%r3
+ xgr %r3,%r4
+___
+$code.=<<___ if (!$softonly);
+ lhi %r0,16
+ cl %r0,240($key)
+ jh .Lcbc_software
+
+ lg %r0,0($ivp) # copy ivec
+ lg %r1,8($ivp)
+ stmg %r0,%r1,16($sp)
+ lmg %r0,%r1,0($key) # copy key, cover 256 bit
+ stmg %r0,%r1,32($sp)
+ lmg %r0,%r1,16($key)
+ stmg %r0,%r1,48($sp)
+ l %r0,240($key) # load kmc code
+ lghi $key,15 # res=len%16, len-=res;
+ ngr $key,$len
+ sl${g}r $len,$key
+ la %r1,16($sp) # parameter block - ivec || key
+ jz .Lkmc_truncated
+ .long 0xb92f0042 # kmc %r4,%r2
+ brc 1,.-4 # pay attention to "partial completion"
+ ltr $key,$key
+ jnz .Lkmc_truncated
+.Lkmc_done:
+ lmg %r0,%r1,16($sp) # copy ivec to caller
+ stg %r0,0($ivp)
+ stg %r1,8($ivp)
+ br $ra
+.align 16
+.Lkmc_truncated:
+ ahi $key,-1 # it's the way it's encoded in mvc
+ tmll %r0,0x80
+ jnz .Lkmc_truncated_dec
+ lghi %r1,0
+ stg %r1,16*$SIZE_T($sp)
+ stg %r1,16*$SIZE_T+8($sp)
+ bras %r1,1f
+ mvc 16*$SIZE_T(1,$sp),0($inp)
+1: ex $key,0(%r1)
+ la %r1,16($sp) # restore parameter block
+ la $inp,16*$SIZE_T($sp)
+ lghi $len,16
+ .long 0xb92f0042 # kmc %r4,%r2
+ j .Lkmc_done
+.align 16
+.Lkmc_truncated_dec:
+ st${g} $out,4*$SIZE_T($sp)
+ la $out,16*$SIZE_T($sp)
+ lghi $len,16
+ .long 0xb92f0042 # kmc %r4,%r2
+ l${g} $out,4*$SIZE_T($sp)
+ bras %r1,2f
+ mvc 0(1,$out),16*$SIZE_T($sp)
+2: ex $key,0(%r1)
+ j .Lkmc_done
+.align 16
+.Lcbc_software:
+___
+$code.=<<___;
+ stm${g} $key,$ra,5*$SIZE_T($sp)
+ lhi %r0,0
+ cl %r0,`$stdframe+$SIZE_T-4`($sp)
+ je .Lcbc_decrypt
+
+ larl $tbl,AES_Te
+
+ llgf $s0,0($ivp)
+ llgf $s1,4($ivp)
+ llgf $s2,8($ivp)
+ llgf $s3,12($ivp)
+
+ lghi $t0,16
+ sl${g}r $len,$t0
+ brc 4,.Lcbc_enc_tail # if borrow
+.Lcbc_enc_loop:
+ stm${g} $inp,$out,2*$SIZE_T($sp)
+ x $s0,0($inp)
+ x $s1,4($inp)
+ x $s2,8($inp)
+ x $s3,12($inp)
+ lgr %r4,$key
+
+ bras $ra,_s390x_AES_encrypt
+
+ lm${g} $inp,$key,2*$SIZE_T($sp)
+ st $s0,0($out)
+ st $s1,4($out)
+ st $s2,8($out)
+ st $s3,12($out)
+
+ la $inp,16($inp)
+ la $out,16($out)
+ lghi $t0,16
+ lt${g}r $len,$len
+ jz .Lcbc_enc_done
+ sl${g}r $len,$t0
+ brc 4,.Lcbc_enc_tail # if borrow
+ j .Lcbc_enc_loop
+.align 16
+.Lcbc_enc_done:
+ l${g} $ivp,6*$SIZE_T($sp)
+ st $s0,0($ivp)
+ st $s1,4($ivp)
+ st $s2,8($ivp)
+ st $s3,12($ivp)
+
+ lm${g} %r7,$ra,7*$SIZE_T($sp)
+ br $ra
+
+.align 16
+.Lcbc_enc_tail:
+ aghi $len,15
+ lghi $t0,0
+ stg $t0,16*$SIZE_T($sp)
+ stg $t0,16*$SIZE_T+8($sp)
+ bras $t1,3f
+ mvc 16*$SIZE_T(1,$sp),0($inp)
+3: ex $len,0($t1)
+ lghi $len,0
+ la $inp,16*$SIZE_T($sp)
+ j .Lcbc_enc_loop
+
+.align 16
+.Lcbc_decrypt:
+ larl $tbl,AES_Td
+
+ lg $t0,0($ivp)
+ lg $t1,8($ivp)
+ stmg $t0,$t1,16*$SIZE_T($sp)
+
+.Lcbc_dec_loop:
+ stm${g} $inp,$out,2*$SIZE_T($sp)
+ llgf $s0,0($inp)
+ llgf $s1,4($inp)
+ llgf $s2,8($inp)
+ llgf $s3,12($inp)
+ lgr %r4,$key
+
+ bras $ra,_s390x_AES_decrypt
+
+ lm${g} $inp,$key,2*$SIZE_T($sp)
+ sllg $s0,$s0,32
+ sllg $s2,$s2,32
+ lr $s0,$s1
+ lr $s2,$s3
+
+ lg $t0,0($inp)
+ lg $t1,8($inp)
+ xg $s0,16*$SIZE_T($sp)
+ xg $s2,16*$SIZE_T+8($sp)
+ lghi $s1,16
+ sl${g}r $len,$s1
+ brc 4,.Lcbc_dec_tail # if borrow
+ brc 2,.Lcbc_dec_done # if zero
+ stg $s0,0($out)
+ stg $s2,8($out)
+ stmg $t0,$t1,16*$SIZE_T($sp)
+
+ la $inp,16($inp)
+ la $out,16($out)
+ j .Lcbc_dec_loop
+
+.Lcbc_dec_done:
+ stg $s0,0($out)
+ stg $s2,8($out)
+.Lcbc_dec_exit:
+ lm${g} %r6,$ra,6*$SIZE_T($sp)
+ stmg $t0,$t1,0($ivp)
+
+ br $ra
+
+.align 16
+.Lcbc_dec_tail:
+ aghi $len,15
+ stg $s0,16*$SIZE_T($sp)
+ stg $s2,16*$SIZE_T+8($sp)
+ bras $s1,4f
+ mvc 0(1,$out),16*$SIZE_T($sp)
+4: ex $len,0($s1)
+ j .Lcbc_dec_exit
+.size AES_cbc_encrypt,.-AES_cbc_encrypt
+___
+}
+########################################################################
+# 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="%r4"; # blocks and out are swapped
+my $len="%r3";
+my $key="%r5"; my $iv0="%r5";
+my $ivp="%r6";
+my $fp ="%r7";
+
+$code.=<<___;
+.globl AES_ctr32_encrypt
+.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);
+ l %r0,240($key)
+ lhi %r1,16
+ clr %r0,%r1
+ jl .Lctr32_software
+
+ stm${g} %r6,$s3,6*$SIZE_T($sp)
+
+ slgr $out,$inp
+ la %r1,0($key) # %r1 is permanent copy of $key
+ lg $iv0,0($ivp) # load ivec
+ lg $ivp,8($ivp)
+
+ # 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
+ srlg $fp,$fp,4 # convert bytes to blocks, minimum 16
+ st${g} $s2,0($sp) # back-chain
+ st${g} $fp,$SIZE_T($sp)
+
+ slgr $len,$fp
+ 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($sp)
+
+.Lctr32_hw_switch:
+___
+$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_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_km_prepare
+
+ la $s0,16($sp) # inp
+ sllg $s1,$fp,4 # len
+ la $s2,16($sp) # out
+ .long 0xb92e00a8 # km %r10,%r8
+ brc 1,.-4 # pay attention to "partial completion"
+
+ la $s2,16($sp)
+ lgr $s3,$fp
+ slgr $s2,$inp
+.Lctr32_km_xor:
+ lg $s0,0($inp)
+ lg $s1,8($inp)
+ xg $s0,0($s2,$inp)
+ xg $s1,8($s2,$inp)
+ stg $s0,0($out,$inp)
+ stg $s1,8($out,$inp)
+ la $inp,16($inp)
+ brct $s3,.Lctr32_km_xor
+
+ slgr $len,$fp
+ brc 1,.Lctr32_km_loop # not zero, no borrow
+ algr $fp,$len
+ lghi $len,0
+ brc 4+1,.Lctr32_km_loop # not zero
+
+ l${g} $s0,0($sp)
+ l${g} $s1,$SIZE_T($sp)
+ la $s2,16($sp)
+.Lctr32_km_zap:
+ stg $s0,0($s2)
+ stg $s0,8($s2)
+ la $s2,16($s2)
+ brct $s1,.Lctr32_km_zap
+
+ la $sp,0($s0)
+ lm${g} %r6,$s3,6*$SIZE_T($sp)
+ br $ra
+.align 16
+.Lctr32_software:
+___
+$code.=<<___;
+ stm${g} $key,$ra,5*$SIZE_T($sp)
+ sl${g}r $inp,$out
+ larl $tbl,AES_Te
+ llgf $t1,12($ivp)
+
+.Lctr32_loop:
+ stm${g} $inp,$out,2*$SIZE_T($sp)
+ llgf $s0,0($ivp)
+ llgf $s1,4($ivp)
+ llgf $s2,8($ivp)
+ lgr $s3,$t1
+ st $t1,16*$SIZE_T($sp)
+ lgr %r4,$key
+
+ bras $ra,_s390x_AES_encrypt
+
+ lm${g} $inp,$ivp,2*$SIZE_T($sp)
+ llgf $t1,16*$SIZE_T($sp)
+ 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,
+# const unsigned char iv[16]);
+#
+{
+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(1);
+ 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
+ algr $s0,$s0
+ alcgr $s1,$s1
+ xgr $s0,$i1
+.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
+ algr $s0,$s0
+ alcgr $s1,$s1
+ xgr $s0,$i1
+
+ 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
+
+ # generate the tweak value
+ l${g} $s3,$stdframe($sp) # pointer to iv
+ la $s2,$tweak($sp)
+ lmg $s0,$s1,0($s3)
+ 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
+
+ l${g} $s3,$stdframe($sp) # ivp
+ llgf $s0,0($s3) # load iv
+ llgf $s1,4($s3)
+ llgf $s2,8($s3)
+ llgf $s3,12($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
+ algr $s1,$s1
+ alcgr $s3,$s3
+ xgr $s1,%r1
+ 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
+ algr $s1,$s1
+ alcgr $s3,$s3
+ xgr $s1,%r1
+ 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 $ra
+.size AES_xts_encrypt,.-AES_xts_encrypt
+___
+# void AES_xts_decrypt(const char *inp,char *out,size_t len,
+# const AES_KEY *key1, const AES_KEY *key2,
+# const unsigned char iv[16]);
+#
+$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
+ l${g} $s3,$stdframe($sp) # pointer to iv
+ la $s2,$tweak($sp)
+ lmg $s0,$s1,0($s3)
+ lghi $s3,16
+ stmg $s0,$s1,0($s2)
+ la %r1,0($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
+ algr $s0,$s0
+ alcgr $s1,$s1
+ xgr $s0,$i1
+ 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
+
+ l${g} $s3,$stdframe($sp) # ivp
+ llgf $s0,0($s3) # load iv
+ llgf $s1,4($s3)
+ llgf $s2,8($s3)
+ llgf $s3,12($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
+ algr $s1,$s1
+ alcgr $s3,$s3
+ xgr $s1,%r1
+ 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)
+ 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
+ algr $s1,$s1
+ alcgr $s3,$s3
+ xgr $s1,%r1
+ 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
+ algr $s1,$s1
+ alcgr $s3,$s3
+ xgr $s1,%r1
+ 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 $ra
+.size AES_xts_decrypt,.-AES_xts_decrypt
+___
+}
+$code.=<<___;
projects / openssl.git / blobdiff