diff options
Diffstat (limited to 'crypto/ec/curve448/arch_32/f_impl.h')
-rw-r--r-- | crypto/ec/curve448/arch_32/f_impl.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/crypto/ec/curve448/arch_32/f_impl.h b/crypto/ec/curve448/arch_32/f_impl.h new file mode 100644 index 0000000000..c3687888c0 --- /dev/null +++ b/crypto/ec/curve448/arch_32/f_impl.h @@ -0,0 +1,40 @@ +/* Copyright (c) 2014-2016 Cryptography Research, Inc. + * Released under the MIT License. See LICENSE.txt for license information. + */ + +#define GF_HEADROOM 2 +#define LIMB(x) (x##ull)&((1ull<<28)-1), (x##ull)>>28 +#define FIELD_LITERAL(a,b,c,d,e,f,g,h) \ + {{LIMB(a),LIMB(b),LIMB(c),LIMB(d),LIMB(e),LIMB(f),LIMB(g),LIMB(h)}} + +#define LIMB_PLACE_VALUE(i) 28 + +void gf_add_RAW (gf out, const gf a, const gf b) { + for (unsigned int i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) { + out->limb[i] = a->limb[i] + b->limb[i]; + } +} + +void gf_sub_RAW (gf out, const gf a, const gf b) { + for (unsigned int i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) { + out->limb[i] = a->limb[i] - b->limb[i]; + } +} + +void gf_bias (gf a, int amt) { + uint32_t co1 = ((1ull<<28)-1)*amt, co2 = co1-amt; + for (unsigned int i=0; i<sizeof(*a)/sizeof(a->limb[0]); i++) { + a->limb[i] += (i==sizeof(*a)/sizeof(a->limb[0])/2) ? co2 : co1; + } +} + +void gf_weak_reduce (gf a) { + uint32_t mask = (1ull<<28) - 1; + uint32_t tmp = a->limb[15] >> 28; + a->limb[8] += tmp; + for (unsigned int i=15; i>0; i--) { + a->limb[i] = (a->limb[i] & mask) + (a->limb[i-1]>>28); + } + a->limb[0] = (a->limb[0] & mask) + tmp; +} + |