--- /dev/null
+#!/usr/bin/env perl
+#
+# ====================================================================
+# Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
+# project. The module is, however, dual licensed under OpenSSL and
+# CRYPTOGAMS licenses depending on where you obtain it. For further
+# details see http://www.openssl.org/~appro/cryptogams/.
+# ====================================================================
+
+# This module doesn't present direct interest for OpenSSL, because it
+# doesn't provide better performance for longer keys. While 512-bit
+# RSA private key operations are 40% faster, 1024-bit ones are hardly
+# faster at all, while longer key operations are slower by up to 20%.
+# It might be of interest to embedded system developers though, as
+# it's smaller than 1KB, yet offers ~3x improvement over compiler
+# generated code.
+#
+# The module targets N32 and N64 MIPS ABIs and currently is a bit
+# IRIX-centric, i.e. is likely to require adaptation for other OSes.
+
+# int bn_mul_mont(
+$rp="a0"; # BN_ULONG *rp,
+$ap="a1"; # const BN_ULONG *ap,
+$bp="a2"; # const BN_ULONG *bp,
+$np="a3"; # const BN_ULONG *np,
+$n0="a4"; # const BN_ULONG *n0,
+$num="a5"; # int num);
+
+$lo0="a6";
+$hi0="a7";
+$lo1="v0";
+$hi1="v1";
+$aj="t0";
+$bi="t1";
+$nj="t2";
+$tp="t3";
+$alo="s0";
+$ahi="s1";
+$nlo="s2";
+$nhi="s3";
+$tj="s4";
+$i="s5";
+$j="s6";
+$fp="t8";
+$m1="t9";
+
+$FRAME=8*(2+8);
+
+$code=<<___;
+#include <asm.h>
+#include <regdef.h>
+
+.text
+
+.set noat
+.set reorder
+
+.align 5
+.globl bn_mul_mont
+.ent bn_mul_mont
+bn_mul_mont:
+ .set noreorder
+ PTR_SUB sp,64
+ move $fp,sp
+ .frame $fp,64,ra
+ slt AT,$num,4
+ li v0,0
+ beqzl AT,.Lproceed
+ nop
+ jr ra
+ PTR_ADD sp,$fp,64
+ .set reorder
+.align 5
+.Lproceed:
+ ld $n0,0($n0)
+ ld $bi,0($bp) # bp[0]
+ ld $aj,0($ap) # ap[0]
+ ld $nj,0($np) # np[0]
+ PTR_SUB sp,16 # place for two extra words
+ sll $num,3
+ li AT,-4096
+ PTR_SUB sp,$num
+ and sp,AT
+
+ sd s0,0($fp)
+ sd s1,8($fp)
+ sd s2,16($fp)
+ sd s3,24($fp)
+ sd s4,32($fp)
+ sd s5,40($fp)
+ sd s6,48($fp)
+ sd s7,56($fp)
+
+ dmultu $aj,$bi
+ ld $alo,8($ap)
+ ld $nlo,8($np)
+ mflo $lo0
+ mfhi $hi0
+ dmultu $lo0,$n0
+ mflo $m1
+
+ dmultu $alo,$bi
+ mflo $alo
+ mfhi $ahi
+
+ dmultu $nj,$m1
+ mflo $lo1
+ mfhi $hi1
+ dmultu $nlo,$m1
+ daddu $lo1,$lo0
+ sltu AT,$lo1,$lo0
+ daddu $hi1,AT
+ mflo $nlo
+ mfhi $nhi
+
+ move $tp,sp
+ li $j,16
+.align 4
+.L1st:
+ .set noreorder
+ PTR_ADD $aj,$ap,$j
+ ld $aj,($aj)
+ PTR_ADD $nj,$np,$j
+ ld $nj,($nj)
+
+ dmultu $aj,$bi
+ daddu $lo0,$alo,$hi0
+ daddu $lo1,$nlo,$hi1
+ sltu AT,$lo0,$hi0
+ sltu s7,$lo1,$hi1
+ daddu $hi0,$ahi,AT
+ daddu $hi1,$nhi,s7
+ mflo $alo
+ mfhi $ahi
+
+ daddu $lo1,$lo0
+ sltu AT,$lo1,$lo0
+ dmultu $nj,$m1
+ daddu $hi1,AT
+ addu $j,8
+ sd $lo1,($tp)
+ sltu s7,$j,$num
+ mflo $nlo
+ mfhi $nhi
+
+ bnez s7,.L1st
+ PTR_ADD $tp,8
+ .set reorder
+
+ daddu $lo0,$alo,$hi0
+ sltu AT,$lo0,$hi0
+ daddu $hi0,$ahi,AT
+
+ daddu $lo1,$nlo,$hi1
+ sltu s7,$lo1,$hi1
+ daddu $hi1,$nhi,s7
+ daddu $lo1,$lo0
+ sltu AT,$lo1,$lo0
+ daddu $hi1,AT
+
+ sd $lo1,($tp)
+
+ daddu $hi1,$hi0
+ sltu AT,$hi1,$hi0
+ sd $hi1,8($tp)
+ sd AT,16($tp)
+
+ li $i,8
+.align 4
+.Louter:
+ PTR_ADD $bi,$bp,$i
+ ld $bi,($bi)
+ ld $aj,($ap)
+ ld $alo,8($ap)
+ ld $tj,(sp)
+
+ dmultu $aj,$bi
+ ld $nj,($np)
+ ld $nlo,8($np)
+ mflo $lo0
+ mfhi $hi0
+ daddu $lo0,$tj
+ dmultu $lo0,$n0
+ sltu AT,$lo0,$tj
+ daddu $hi0,AT
+ mflo $m1
+
+ dmultu $alo,$bi
+ mflo $alo
+ mfhi $ahi
+
+ dmultu $nj,$m1
+ mflo $lo1
+ mfhi $hi1
+
+ dmultu $nlo,$m1
+ daddu $lo1,$lo0
+ sltu AT,$lo1,$lo0
+ daddu $hi1,AT
+ mflo $nlo
+ mfhi $nhi
+
+ move $tp,sp
+ li $j,16
+ ld $tj,8($tp)
+.align 4
+.Linner:
+ .set noreorder
+ PTR_ADD $aj,$ap,$j
+ ld $aj,($aj)
+ PTR_ADD $nj,$np,$j
+ ld $nj,($nj)
+
+ dmultu $aj,$bi
+ daddu $lo0,$alo,$hi0
+ daddu $lo1,$nlo,$hi1
+ sltu AT,$lo0,$hi0
+ sltu s7,$lo1,$hi1
+ daddu $hi0,$ahi,AT
+ daddu $hi1,$nhi,s7
+ mflo $alo
+ mfhi $ahi
+
+ daddu $lo0,$tj
+ addu $j,8
+ dmultu $nj,$m1
+ sltu AT,$lo0,$tj
+ daddu $lo1,$lo0
+ daddu $hi0,AT
+ sltu s7,$lo1,$lo0
+ ld $tj,16($tp)
+ daddu $hi1,s7
+ sltu AT,$j,$num
+ mflo $nlo
+ mfhi $nhi
+ sd $lo1,($tp)
+ bnez AT,.Linner
+ PTR_ADD $tp,8
+ .set reorder
+
+ daddu $lo0,$alo,$hi0
+ sltu AT,$lo0,$hi0
+ daddu $hi0,$ahi,AT
+ daddu $lo0,$tj
+ sltu s7,$lo0,$tj
+ daddu $hi0,s7
+
+ ld $tj,16($tp)
+ daddu $lo1,$nlo,$hi1
+ sltu AT,$lo1,$hi1
+ daddu $hi1,$nhi,AT
+ daddu $lo1,$lo0
+ sltu s7,$lo1,$lo0
+ daddu $hi1,s7
+ sd $lo1,($tp)
+
+ daddu $lo1,$hi1,$hi0
+ sltu $hi1,$lo1,$hi0
+ daddu $lo1,$tj
+ sltu AT,$lo1,$tj
+ daddu $hi1,AT
+ sd $lo1,8($tp)
+ sd $hi1,16($tp)
+
+ addu $i,8
+ sltu s7,$i,$num
+ bnez s7,.Louter
+\f
+ .set noreorder
+ PTR_ADD $tj,sp,$num # &tp[num]
+ move $tp,sp
+ move $ap,sp
+ li $hi0,0 # clear borrow bit
+
+.align 4
+.Lsub: ld $lo0,($tp)
+ ld $lo1,($np)
+ PTR_ADD $tp,8
+ PTR_ADD $np,8
+ dsubu $lo1,$lo0,$lo1 # tp[i]-np[i]
+ sgtu AT,$lo1,$lo0
+ dsubu $lo0,$lo1,$hi0
+ sgtu $hi0,$lo0,$lo1
+ sd $lo0,($rp)
+ or $hi0,AT
+ sltu AT,$tp,$tj
+ bnez AT,.Lsub
+ PTR_ADD $rp,8
+
+ dsubu $hi0,$hi1,$hi0 # handle upmost overflow bit
+ move $tp,sp
+ PTR_SUB $rp,$num # restore rp
+ not $hi1,$hi0
+
+ and $ap,$hi0,sp
+ and $bp,$hi1,$rp
+ or $ap,$ap,$bp # ap=borrow?tp:rp
+
+.align 4
+.Lcopy: ld $aj,($ap)
+ PTR_ADD $ap,8
+ PTR_ADD $tp,8
+ sd zero,-8($tp)
+ sltu AT,$tp,$tj
+ sd $aj,($rp)
+ bnez AT,.Lcopy
+ PTR_ADD $rp,8
+
+ ld s0,0($fp)
+ ld s1,8($fp)
+ ld s2,16($fp)
+ ld s3,24($fp)
+ ld s4,32($fp)
+ ld s5,40($fp)
+ ld s6,48($fp)
+ ld s7,56($fp)
+ li v0,1
+ jr ra
+ PTR_ADD sp,$fp,64
+ .set reorder
+END(bn_mul_mont)
+.rdata
+.asciiz "Montgomery Multiplication for MIPS III/IV, CRYPTOGAMS by <appro\@openssl.org>"
+___
+
+print $code;
+close STDOUT;
projects / cassiopeia.git / blobdiff