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C nettle, low-level cryptographics library
C
C Copyright (C) 2013, Niels Möller
C
C The nettle library is free software; you can redistribute it and/or modify
C it under the terms of the GNU Lesser General Public License as published by
C the Free Software Foundation; either version 2.1 of the License, or (at your
C option) any later version.
C
C The nettle library is distributed in the hope that it will be useful, but
C WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
C or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
C License for more details.
C
C You should have received a copy of the GNU Lesser General Public License
C along with the nettle library; see the file COPYING.LIB. If not, write to
C the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
C MA 02111-1301, USA.
.file "ecc-192-modp.asm"
.arm
define(<HP>, <r0>) C Overlaps unused ecc argument
define(<RP>, <r1>)
define(<T0>, <r2>)
define(<T1>, <r3>)
define(<T2>, <r4>)
define(<T3>, <r5>)
define(<T4>, <r6>)
define(<T5>, <r7>)
define(<T6>, <r8>)
define(<T7>, <r10>)
define(<H0>, <T0>) C Overlaps T0 and T1
define(<H1>, <T1>)
define(<C2>, <HP>)
define(<C4>, <r12>)
C ecc_192_modp (const struct ecc_curve *ecc, mp_limb_t *rp)
.text
.align 2
PROLOGUE(nettle_ecc_192_modp)
push {r4,r5,r6,r7,r8,r10}
C Reduce two words at a time
add HP, RP, #48
add RP, RP, #8
ldmdb HP!, {H0,H1}
ldm RP, {T2,T3,T4,T5,T6,T7}
mov C4, #0
adds T4, T4, H0
adcs T5, T5, H1
adcs T6, T6, H0
adcs T7, T7, H1
C Need to add carry to T2 and T4, do T4 later.
adc C4, C4, #0
ldmdb HP!, {H0,H1}
mov C2, #0
adcs T2, T2, H0
adcs T3, T3, H1
adcs T4, T4, H0
adcs T5, T5, H1
C Need to add carry to T0 and T2, do T2 later
adc C2, C2, #0
ldmdb RP!, {T0, T1}
adcs T0, T0, T6
adcs T1, T1, T7
adcs T2, T2, T6
adcs T3, T3, T7
adc C4, C4, #0
adds T2, T2, C2
adcs T3, T3, #0
adcs T4, T4, C4
adcs T5, T5, #0
mov C2, #0
adc C2, C2, #0
C Add in final carry
adcs T0, T0, #0
adcs T1, T1, #0
adcs T2, T2, C2
adcs T3, T3, #0
adcs T4, T4, #0
adc T5, T5, #0
stm RP, {T0,T1,T2,T3,T4,T5}
pop {r4,r5,r6,r7,r8,r10}
bx lr
EPILOGUE(nettle_ecc_192_modp)
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