Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | 1x 1x | import * as crypto from '@node-dlc/crypto';
export class ChannelKeys {
/**
* Derives a public key that can be used for local or remote
* pubkey, htlc_pubkey, or delayed_pubkey
*
* Derived via:
* pubkey = basepoint + SHA256(per_commitment_point || basepoint) * G
*
* @param perCommitmentPoint 33-byte buffer
* @param basePoint 33-byte base point
* @returns 33-byte buffer
*/
public static derivePubKey(
perCommitmentPoint: Buffer,
basePoint: Buffer,
): Buffer {
const tweak = crypto.sha256(Buffer.concat([perCommitmentPoint, basePoint]));
return crypto.publicKeyTweakAdd(basePoint, tweak, true);
}
/**
* Derives the private keys based on local basepoint secrets and can
* be used to derive per-commitment
* - payment_scret
* - delayedpayment_secret
* - htlc_secret
*
* Derived via:
* privkey = basepoint_secret + SHA256(per_commitment_point || basepoint)
*
* @param perCommitmentPoint 32-byte buffer
* @param basePointSecret 32-byte buffer
* @return 32-byte buffer
*/
public static derivePrivKey(
perCommitmentPoint: Buffer,
basePointSecret: Buffer,
): Buffer {
const basePoint = crypto.getPublicKey(basePointSecret, true);
const tweak = crypto.sha256(Buffer.concat([perCommitmentPoint, basePoint]));
return crypto.privateKeyTweakAdd(basePointSecret, tweak);
}
/**
* Derives the revocationpubkey blinded key for either local or
* remote revocation pubkey generation.
*
* Derived via:
* revocationpubkey = revocation_basepoint * SHA256(revocation_basepoint || per_commitment_point) +
* per_commitment_point * SHA256(per_commitment_point || revocation_basepoint)
*
* @param perCommitmentPoint 33-byte buffer
* @param basePoint 33-byte buffer
* @returns 33-byte buffer
*/
public static deriveRevocationPubKey(
perCommitmentPoint: Buffer,
basePoint: Buffer,
): Buffer {
const tweakA = crypto.sha256(
Buffer.concat([basePoint, perCommitmentPoint]),
);
const a = crypto.publicKeyTweakMul(basePoint, tweakA, true);
const tweakB = crypto.sha256(
Buffer.concat([perCommitmentPoint, basePoint]),
);
const b = crypto.publicKeyTweakMul(perCommitmentPoint, tweakB, true);
return crypto.publicKeyCombine([a, b], true);
}
/**
* Derives the revocationprivkey which is used by the local node
* and with a per_commitment_secret that was revealed by the
* counterparty.
*
* Derived via:
* revocationprivkey = revocation_basepoint_secret * SHA256(revocation_basepoint || per_commitment_point) +
* per_commitment_secret * SHA256(per_commitment_point || revocation_basepoint)
* @param perCommitmentPointSecret 32-byte buffer
* @param basePointSecret 32-byte buffer
*/
public static deriveRevocationPrivKey(
perCommitmentPointSecret: Buffer,
basePointSecret: Buffer,
): Buffer {
const basePoint = crypto.getPublicKey(basePointSecret, true);
const perCommitmentPoint = crypto.getPublicKey(
perCommitmentPointSecret,
true,
);
const tweakA = crypto.sha256(
Buffer.concat([basePoint, perCommitmentPoint]),
);
const a = crypto.privateKeyTweakMul(basePointSecret, tweakA);
const tweakB = crypto.sha256(
Buffer.concat([perCommitmentPoint, basePoint]),
);
const b = crypto.privateKeyTweakMul(perCommitmentPointSecret, tweakB);
const result = crypto.privateKeyTweakAdd(a, b);
return result;
}
}
|