Function computeLagrangeCoefficient

computeLagrangeCoefficient<C extends Ciphersuite>(
    ciphersuite: C,
    signerIds: Identifier<C>[],
    xCoord: Identifier<C> | undefined,
    signerId: Identifier<C>,
): C["Scalar"]
Internal
Compute the Lagrange coefficient for a participant.

Implements derive_interpolating_value from the spec.
Type Parameters
- C extends Ciphersuite
Parameters
- ciphersuite: C
  The ciphersuite to use
- signerIds: Identifier<C>[]
  Array of participant identifiers in the signing set
- xCoord: Identifier<C> | undefined
  The x-coordinate for the coefficient (or undefined for x=0)
- signerId: Identifier<C>
  The participant's own identifier
Returns C["Scalar"]
The Lagrange coefficient

Throws
If the identifier is duplicated or not found
- Defined in keys.ts:34