release/src/router/nettle/x86_64/ecc-192-modp.asm

   1 C nettle, low-level cryptographics library
   2 C
   3 C Copyright (C) 2013 Niels Möller
   4 C
   5 C The nettle library is free software; you can redistribute it and/or modify
   6 C it under the terms of the GNU Lesser General Public License as published by
   7 C the Free Software Foundation; either version 2.1 of the License, or (at your
   8 C option) any later version.
   9 C
  10 C The nettle library is distributed in the hope that it will be useful, but
  11 C WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12 C or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  13 C License for more details.
  14 C
  15 C You should have received a copy of the GNU Lesser General Public License
  16 C along with the nettle library; see the file COPYING.LIB.  If not, write to
  17 C the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18 C MA 02111-1301, USA.
  19
  20         .file "ecc-192-modp.asm"
  21
  22 define(<RP>, <%rsi>)
  23 define(<T0>, <%rdi>) C Overlaps unused ecc input
  24 define(<T1>, <%rcx>)
  25 define(<T2>, <%rdx>)
  26 define(<T3>, <%r8>)
  27 define(<H>, <%r9>)
  28 define(<C1>, <%r10>)
  29 define(<C2>, <%r11>)
  30
  31         C ecc_192_modp (const struct ecc_curve *ecc, mp_limb_t *rp)
  32         .text
  33         ALIGN(16)
  34 PROLOGUE(nettle_ecc_192_modp)
  35         W64_ENTRY(2, 0)
  36         mov     16(RP), T2
  37         mov     24(RP), T3
  38         mov     40(RP), H
  39         xor     C1, C1
  40         xor     C2, C2
  41
  42         add     H, T2
  43         adc     H, T3
  44         C Carry to be added in at T1 and T2
  45         setc    LREG(C2)
  46
  47         mov     8(RP), T1
  48         mov     32(RP), H
  49         adc     H, T1
  50         adc     H, T2
  51         C Carry to be added in at T0 and T1
  52         setc    LREG(C1)
  53
  54         mov     (RP), T0
  55         adc     T3, T0
  56         adc     T3, T1
  57         adc     $0, C2
  58
  59         C Add in C1 and C2
  60         add     C1, T1
  61         adc     C2, T2
  62         setc    LREG(C1)
  63
  64         C Fold final carry.
  65         adc     $0, T0
  66         adc     C1, T1
  67         adc     $0, T2
  68
  69         mov     T0, (RP)
  70         mov     T1, 8(RP)
  71         mov     T2, 16(RP)
  72
  73         W64_EXIT(2, 0)
  74         ret
  75 EPILOGUE(nettle_ecc_192_modp)