diff options
Diffstat (limited to 'crypto/ec/curve448/arch_64/f_impl.h')
-rw-r--r-- | crypto/ec/curve448/arch_64/f_impl.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/crypto/ec/curve448/arch_64/f_impl.h b/crypto/ec/curve448/arch_64/f_impl.h new file mode 100644 index 0000000000..8751ceecd9 --- /dev/null +++ b/crypto/ec/curve448/arch_64/f_impl.h @@ -0,0 +1,49 @@ +/* + * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved. + * Copyright 2014-2016 Cryptography Research, Inc. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + * + * Originally written by Mike Hamburg + */ + +#define GF_HEADROOM 9999 /* Everything is reduced anyway */ +#define FIELD_LITERAL(a,b,c,d,e,f,g,h) {{a,b,c,d,e,f,g,h}} + +#define LIMB_PLACE_VALUE(i) 56 + +void gf_add_RAW(gf out, const gf a, const gf b) +{ + for (unsigned int i = 0; i < 8; i++) + out->limb[i] = a->limb[i] + b->limb[i]; + gf_weak_reduce(out); +} + +void gf_sub_RAW(gf out, const gf a, const gf b) +{ + uint64_t co1 = ((1ull << 56) - 1) * 2, co2 = co1 - 2; + + for (unsigned int i = 0; i < 8; i++) + out->limb[i] = a->limb[i] - b->limb[i] + ((i == 4) ? co2 : co1); + gf_weak_reduce(out); +} + +void gf_bias(gf a, int amt) +{ + (void)a; + (void)amt; +} + +void gf_weak_reduce(gf a) +{ + uint64_t mask = (1ull << 56) - 1; + uint64_t tmp = a->limb[7] >> 56; + + a->limb[4] += tmp; + for (unsigned int i = 7; i > 0; i--) + a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 56); + a->limb[0] = (a->limb[0] & mask) + tmp; +} |