Add _ge_set_all_gej and use it in musig for own public nonces #1614

  79 | @@ -80,7 +80,10 @@ static void secp256k1_ge_set_gej(secp256k1_ge *r, secp256k1_gej *a);
  80 |  /** Set a group element equal to another which is given in jacobian coordinates. */
  81 |  static void secp256k1_ge_set_gej_var(secp256k1_ge *r, secp256k1_gej *a);
  82 |  
  83 | -/** Set a batch of group elements equal to the inputs given in jacobian coordinates */
  84 | +/** Set a batch of group elements equal to the inputs given in jacobian coordinates (affine). Constant time. */

---

  84 | +/** Set group elements r[0:len] (affine) equal to group elements a[0:len] (jacobian).
  85 | + * None of the group elements in a[0:len] may be infinity. Constant time. */
  86 | +static void secp256k1_ge_set_all_gej(secp256k1_ge *r, const secp256k1_gej *a, size_t len);
  87 | +
  88 | +/** Set group elements r[0:len] (affine) equal to group elements a[0:len] (jacobian).
  89 | + * None of the group elements in a[0:len] may be infinity. */

---

 453 | +        secp256k1_ecmult_gen(&ctx->ecmult_gen_ctx, &nonce_ptj[i], &k[i]);
 454 |          secp256k1_scalar_clear(&k[i]);
 455 |      }
 456 | +    secp256k1_ge_set_all_gej(nonce_pts, nonce_ptj, 2);
 457 | +    for (i = 0; i < 2; i++) {
 458 | +        secp256k1_declassify(ctx, &nonce_pts[i], sizeof(nonce_pts));

---