+++ /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