object DLEQUtil

Implements the DLEQ ZKP Specification: https://github.com/discreetlogcontracts/dlcspecs/blob/d01595b70269d4204b05510d19bba6a4f4fcff23/ECDSA-adaptor.md

Note that the naming is not entirely consistent between the specification and this file in hopes of making this code more readable.

The naming in this file more closely matches the naming in the secp256k1-zkp implementation: https://github.com/ElementsProject/secp256k1-zkp/tree/master/src/modules/ecdsa_adaptor

Legend: x <> fe X <> p1/point y <> adaptorSecret Y <> adaptorPoint/adaptor Z <> p2/tweakedPoint a <> k A_G <> r1 A_Y <> r2 b <> e c <> s proof <> (e, s)

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  6. def dleqChallengeHash(adaptorPoint: ECPublicKey, r1: ECPublicKey, r2: ECPublicKey, p1: ECPublicKey, p2: ECPublicKey): ByteVector

    Computes the challenge hash value for dleqProve as specified in https://github.com/discreetlogcontracts/dlcspecs/blob/d01595b70269d4204b05510d19bba6a4f4fcff23/ECDSA-adaptor.md#proving

  7. def dleqNonce(fe: FieldElement, adaptorPoint: ECPublicKey, point: ECPublicKey, tweakedPoint: ECPublicKey, auxRand: ByteVector): FieldElement

    Computes the nonce for dleqProve as specified in https://github.com/discreetlogcontracts/dlcspecs/blob/d01595b70269d4204b05510d19bba6a4f4fcff23/ECDSA-adaptor.md#proving

  8. def dleqPair(fe: FieldElement, adaptorPoint: ECPublicKey): (ECPublicKey, ECPublicKey)
  9. def dleqProve(fe: FieldElement, adaptorPoint: ECPublicKey, auxRand: ByteVector): (FieldElement, FieldElement)

    Proves that the DLOG_G(R') = DLOG_Y(R) (= fe) For a full description, see https://cs.nyu.edu/courses/spring07/G22.3220-001/lec3.pdf

    Proves that the DLOG_G(R') = DLOG_Y(R) (= fe) For a full description, see https://cs.nyu.edu/courses/spring07/G22.3220-001/lec3.pdf

    See also

    https://github.com/discreetlogcontracts/dlcspecs/blob/d01595b70269d4204b05510d19bba6a4f4fcff23/ECDSA-adaptor.md#proving

  10. def dleqVerify(s: FieldElement, e: FieldElement, p1: ECPublicKey, adaptor: ECPublicKey, p2: ECPublicKey): Boolean

    Verifies a proof that the DLOG_G of P1 equals the DLOG_adaptor of P2

    Verifies a proof that the DLOG_G of P1 equals the DLOG_adaptor of P2

    See also

    https://github.com/discreetlogcontracts/dlcspecs/blob/d01595b70269d4204b05510d19bba6a4f4fcff23/ECDSA-adaptor.md#verifying

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