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core/crypto/ristretto255: Initial import

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This commit is contained in:
Yawning Angel
2024-04-09 14:37:59 +09:00
parent 563c527419
commit d96f8bb5c1
4 changed files with 622 additions and 2 deletions
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core/crypto/_fiat/field_curve25519/field.odin
+13 -2
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@@ -109,6 +109,10 @@ fe_carry_opp :: #force_inline proc "contextless" (out1, arg1: ^Tight_Field_Eleme
fe_carry(out1, fe_relax_cast(out1))
}
fe_carry_abs :: #force_inline proc "contextless" (out1, arg1: ^Tight_Field_Element) {
fe_cond_negate(out1, arg1, fe_is_negative(arg1))
}
fe_carry_sqrt_ratio_m1 :: proc "contextless" (
out1: ^Tight_Field_Element,
arg1: ^Loose_Field_Element, // u
@@ -168,8 +172,7 @@ fe_carry_sqrt_ratio_m1 :: proc "contextless" (
fe_cond_assign(r, r_prime, flipped_sign_sqrt | flipped_sign_sqrt_i)
// Pick the non-negative square root.
fe_carry_opp(r_prime, r)
fe_cond_select(out1, r, r_prime, fe_is_negative(r))
fe_carry_abs(out1, r)
fe_clear_vec([]^Tight_Field_Element{&w, &tmp1, &tmp2, &tmp3})
mem.zero_explicit(&b, size_of(b))
@@ -254,3 +257,11 @@ fe_cond_select :: #force_no_inline proc "contextless" (
out1[3] = x4
out1[4] = x5
}
fe_cond_negate :: proc "contextless" (out1, arg1: ^Tight_Field_Element, ctrl: int) {
tmp1: Tight_Field_Element = ---
fe_carry_opp(&tmp1, arg1)
fe_cond_select(out1, arg1, &tmp1, ctrl)
fe_clear(&tmp1)
}