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group: Add constant-time secp256k1_ge_set_all_gej

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This is a dump mechanical translation of secp256k1_ge_set_all_gej_var
that assumes that inputs are not infinity.
This commit is contained in:
Tim Ruffing
2024-10-08 13:42:32 +02:00
committed by Tim Ruffing
parent 9b7c59cbb9
commit d3082ddead
3 changed files with 66 additions and 3 deletions
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6
src/group.h
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@@ -80,7 +80,11 @@ static void secp256k1_ge_set_gej(secp256k1_ge *r, secp256k1_gej *a);
/** Set a group element equal to another which is given in jacobian coordinates. */
static void secp256k1_ge_set_gej_var(secp256k1_ge *r, secp256k1_gej *a);
/** Set a batch of group elements equal to the inputs given in jacobian coordinates */
/** Set group elements r[0:len] (affine) equal to group elements a[0:len] (jacobian).
* None of the group elements in a[0:len] may be infinity. Constant time. */
static void secp256k1_ge_set_all_gej(secp256k1_ge *r, const secp256k1_gej *a, size_t len);
/** Set group elements r[0:len] (affine) equal to group elements a[0:len] (jacobian). */
static void secp256k1_ge_set_all_gej_var(secp256k1_ge *r, const secp256k1_gej *a, size_t len);
/** Bring a batch of inputs to the same global z "denominator", based on ratios between