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Assert field magnitude at control-flow join

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Peter.Dettman
2025-05-20 17:48:22 +07:00
parent 9fab425256
commit 3a4f448cb4
1 changed files with 2 additions and 0 deletions
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src/ecmult_const_impl.h
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@@ -373,6 +373,8 @@ static int secp256k1_ecmult_const_xonly(secp256k1_fe* r, const secp256k1_fe *n,
} }
} }
SECP256K1_FE_VERIFY_MAGNITUDE(&g, 2);
/* Compute base point P = (n*g, g^2), the effective affine version of (n*g, g^2, v), which has /* Compute base point P = (n*g, g^2), the effective affine version of (n*g, g^2, v), which has
* corresponding affine X coordinate n/d. */ * corresponding affine X coordinate n/d. */
secp256k1_fe_mul(&p.x, &g, n); secp256k1_fe_mul(&p.x, &g, n);