diff options
Diffstat (limited to 'crypto/ec/curve448/arch_32/f_impl.h')
-rw-r--r-- | crypto/ec/curve448/arch_32/f_impl.h | 60 |
1 files changed, 60 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 000000000000..bbde84a03897 --- /dev/null +++ b/crypto/ec/curve448/arch_32/f_impl.h @@ -0,0 +1,60 @@ +/* + * 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 + */ + +#ifndef HEADER_ARCH_32_F_IMPL_H +# define HEADER_ARCH_32_F_IMPL_H + +# define GF_HEADROOM 2 +# define LIMB(x) ((x) & ((1 << 28) - 1)), ((x) >> 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) +{ + unsigned int i; + + for (i = 0; i < NLIMBS; i++) + out->limb[i] = a->limb[i] + b->limb[i]; +} + +void gf_sub_RAW(gf out, const gf a, const gf b) +{ + unsigned int i; + + for (i = 0; i < NLIMBS; i++) + out->limb[i] = a->limb[i] - b->limb[i]; +} + +void gf_bias(gf a, int amt) +{ + unsigned int i; + uint32_t co1 = ((1 << 28) - 1) * amt, co2 = co1 - amt; + + for (i = 0; i < NLIMBS; i++) + a->limb[i] += (i == NLIMBS / 2) ? co2 : co1; +} + +void gf_weak_reduce(gf a) +{ + uint32_t mask = (1 << 28) - 1; + uint32_t tmp = a->limb[NLIMBS - 1] >> 28; + unsigned int i; + + a->limb[NLIMBS / 2] += tmp; + for (i = NLIMBS - 1; i > 0; i--) + a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 28); + a->limb[0] = (a->limb[0] & mask) + tmp; +} + +#endif /* HEADER_ARCH_32_F_IMPL_H */ |