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<h1><a href="../../index.html">All files</a> / <a href="index.html">lib/lightning</a> ChannelKeys.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">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 <span class="fstat-no" title="function not covered" >static </span>derivePubKey(
perCommitmentPoint: Buffer,
basePoint: Buffer,
): Buffer {
const tweak = <span class="cstat-no" title="statement not covered" >crypto.sha256(Buffer.concat([perCommitmentPoint, basePoint]));</span>
<span class="cstat-no" title="statement not covered" > return crypto.publicKeyTweakAdd(basePoint, tweak, true);</span>
}
/**
* 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 <span class="fstat-no" title="function not covered" >static </span>derivePrivKey(
perCommitmentPoint: Buffer,
basePointSecret: Buffer,
): Buffer {
const basePoint = <span class="cstat-no" title="statement not covered" >crypto.getPublicKey(basePointSecret, true);</span>
const tweak = <span class="cstat-no" title="statement not covered" >crypto.sha256(Buffer.concat([perCommitmentPoint, basePoint]));</span>
<span class="cstat-no" title="statement not covered" > return crypto.privateKeyTweakAdd(basePointSecret, tweak);</span>
}
/**
* 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 <span class="fstat-no" title="function not covered" >static </span>deriveRevocationPubKey(
perCommitmentPoint: Buffer,
basePoint: Buffer,
): Buffer {
const tweakA = <span class="cstat-no" title="statement not covered" >crypto.sha256(</span>
Buffer.concat([basePoint, perCommitmentPoint]),
);
const a = <span class="cstat-no" title="statement not covered" >crypto.publicKeyTweakMul(basePoint, tweakA, true);</span>
const tweakB = <span class="cstat-no" title="statement not covered" >crypto.sha256(</span>
Buffer.concat([perCommitmentPoint, basePoint]),
);
const b = <span class="cstat-no" title="statement not covered" >crypto.publicKeyTweakMul(perCommitmentPoint, tweakB, true);</span>
<span class="cstat-no" title="statement not covered" > return crypto.publicKeyCombine([a, b], true);</span>
}
/**
* 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 <span class="fstat-no" title="function not covered" >static </span>deriveRevocationPrivKey(
perCommitmentPointSecret: Buffer,
basePointSecret: Buffer,
): Buffer {
const basePoint = <span class="cstat-no" title="statement not covered" >crypto.getPublicKey(basePointSecret, true);</span>
const perCommitmentPoint = <span class="cstat-no" title="statement not covered" >crypto.getPublicKey(</span>
perCommitmentPointSecret,
true,
);
const tweakA = <span class="cstat-no" title="statement not covered" >crypto.sha256(</span>
Buffer.concat([basePoint, perCommitmentPoint]),
);
const a = <span class="cstat-no" title="statement not covered" >crypto.privateKeyTweakMul(basePointSecret, tweakA);</span>
const tweakB = <span class="cstat-no" title="statement not covered" >crypto.sha256(</span>
Buffer.concat([perCommitmentPoint, basePoint]),
);
const b = <span class="cstat-no" title="statement not covered" >crypto.privateKeyTweakMul(perCommitmentPointSecret, tweakB);</span>
const result = <span class="cstat-no" title="statement not covered" >crypto.privateKeyTweakAdd(a, b);</span>
<span class="cstat-no" title="statement not covered" > return result;</span>
}
}
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