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cic-staff-client/docs/compodoc/interfaces/Signable.html
Spencer Ofwiti 948554563d Add documentation to pgp module.
2021-05-12 13:21:18 +03:00

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<!doctype html>
<html class="no-js" lang="">
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<title>CICADA</title>
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<a href="../" class="navbar-brand">CICADA</a>
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<!-- START CONTENT -->
<div class="content interface">
<div class="content-data">
<ol class="breadcrumb">
<li>Interfaces</li>
<li>Signable</li>
</ol>
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<a href="#info" role="tab" id="info-tab" data-toggle="tab" data-link="info">Info</a>
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<div class="tab-pane fade active in" id="c-info">
<p class="comment">
<h3>File</h3>
</p>
<p class="comment">
<code>src/app/_pgp/pgp-signer.ts</code>
</p>
<p class="comment">
<h3>Description</h3>
</p>
<p class="comment">
<p>Signable object interface </p>
</p>
<section>
<h3 id="index">Index</h3>
<table class="table table-sm table-bordered index-table">
<tbody>
<tr>
<td class="col-md-4">
<h6><b>Methods</b></h6>
</td>
</tr>
<tr>
<td class="col-md-4">
<ul class="index-list">
<li>
<a href="#digest">digest</a>
</li>
</ul>
</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3 id="methods">
Methods
</h3>
<table class="table table-sm table-bordered">
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<td class="col-md-4">
<a name="digest"></a>
<span class="name">
<b>
digest
</b>
<a href="#digest"><span class="icon ion-ios-link"></span></a>
</span>
</td>
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<tr>
<td class="col-md-4">
<code>digest()</code>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-line">Defined in <a href="" data-line="11"
class="link-to-prism">src/app/_pgp/pgp-signer.ts:11</a></div>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-description"><p>The message to be signed. </p>
</div>
<div class="io-description">
<b>Returns : </b> <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
</div>
</td>
</tr>
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</section>
</div>
<div class="tab-pane fade tab-source-code" id="c-source">
<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import * as openpgp from &#x27;openpgp&#x27;;
// Application imports
import { MutableKeyStore } from &#x27;@app/_pgp/pgp-key-store&#x27;;
import { LoggingService } from &#x27;@app/_services/logging.service&#x27;;
/** Signable object interface */
interface Signable {
/** The message to be signed. */
digest(): string;
}
/** Signature object interface */
interface Signature {
/** Encryption engine used. */
engine: string;
/** Encryption algorithm used */
algo: string;
/** Data to be signed. */
data: string;
/** Message digest */
digest: string;
}
/** Signer interface */
interface Signer {
/** Event triggered on successful signing of message. */
onsign(signature: Signature): void;
/** Event triggered on successful verification of a signature. */
onverify(flag: boolean): void;
/**
* Get the private key fingerprint.
* @returns A private key fingerprint.
*/
fingerprint(): string;
/**
* Load the message digest.
* @param material - A signable object.
* @returns true - If digest has been loaded successfully.
*/
prepare(material: Signable): boolean;
/**
* Verify that signature is valid.
* @param digest - The message that was signed.
* @param signature - The generated signature.
*/
verify(digest: string, signature: Signature): void;
/**
* Signs a message using a private key.
* @async
* @param digest - The message to be signed.
*/
sign(digest: string): Promise&lt;void&gt;;
}
/** Provides functionality for signing and verifying signed messages. */
class PGPSigner implements Signer {
/** Encryption engine used. */
engine &#x3D; &#x27;pgp&#x27;;
/** Encryption algorithm used */
algo &#x3D; &#x27;sha256&#x27;;
/** Message digest */
dgst: string;
/** Generated signature */
signature: Signature;
/** A keystore holding pgp keys. */
keyStore: MutableKeyStore;
/** Event triggered on successful signing of message. */
onsign: (signature: Signature) &#x3D;&gt; void;
/** Event triggered on successful verification of a signature. */
onverify: (flag: boolean) &#x3D;&gt; void;
/** A service that provides logging capabilities. */
loggingService: LoggingService;
/**
* Initializing the Signer.
* @param keyStore - A keystore holding pgp keys.
*/
constructor(keyStore: MutableKeyStore) {
this.keyStore &#x3D; keyStore;
this.onsign &#x3D; (signature: Signature) &#x3D;&gt; {};
this.onverify &#x3D; (flag: boolean) &#x3D;&gt; {};
}
/**
* Get the private key fingerprint.
* @returns A private key fingerprint.
*/
public fingerprint(): string {
return this.keyStore.getFingerprint();
}
/**
* Load the message digest.
* @param material - A signable object.
* @returns true - If digest has been loaded successfully.
*/
public prepare(material: Signable): boolean {
this.dgst &#x3D; material.digest();
return true;
}
/**
* Verify that signature is valid.
* @param digest - The message that was signed.
* @param signature - The generated signature.
*/
public verify(digest: string, signature: Signature): void {
openpgp.signature
.readArmored(signature.data)
.then((sig) &#x3D;&gt; {
const opts &#x3D; {
message: openpgp.cleartext.fromText(digest),
publicKeys: this.keyStore.getTrustedKeys(),
signature: sig,
};
openpgp.verify(opts).then((v) &#x3D;&gt; {
let i &#x3D; 0;
for (i &#x3D; 0; i &lt; v.signatures.length; i++) {
const s &#x3D; v.signatures[i];
if (s.valid) {
this.onverify(s);
return;
}
}
this.loggingService.sendErrorLevelMessage(
&#x60;Checked ${i} signature(s) but none valid&#x60;,
this,
{ error: &#x27;404 Not found!&#x27; }
);
this.onverify(false);
});
})
.catch((e) &#x3D;&gt; {
this.loggingService.sendErrorLevelMessage(e.message, this, { error: e });
this.onverify(false);
});
}
/**
* Signs a message using a private key.
* @async
* @param digest - The message to be signed.
*/
public async sign(digest: string): Promise&lt;void&gt; {
const m &#x3D; openpgp.cleartext.fromText(digest);
const pk &#x3D; this.keyStore.getPrivateKey();
if (!pk.isDecrypted()) {
const password &#x3D; window.prompt(&#x27;password&#x27;);
await pk.decrypt(password);
}
const opts &#x3D; {
message: m,
privateKeys: [pk],
detached: true,
};
openpgp
.sign(opts)
.then((s) &#x3D;&gt; {
this.signature &#x3D; {
engine: this.engine,
algo: this.algo,
data: s.signature,
// TODO: fix for browser later
digest,
};
this.onsign(this.signature);
})
.catch((e) &#x3D;&gt; {
this.loggingService.sendErrorLevelMessage(e.message, this, { error: e });
this.onsign(undefined);
});
}
}
/** @exports */
export { Signable, Signature, Signer, PGPSigner };
</code></pre>
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