Add serialization

src/private-box.ts

@@ -1,8 +1,8 @@
 import logger from 'log'
 import SecretBox from './secret-box'
 import {DHusage, ecdh} from './kdf'
-import {pubkey_fromString, pubkey_toString, Usage} from './misc'
 import * as consts from './const'
+import * as misc from './misc.ts'
 
 const log = logger('crypto:private-box')
 
@@ -39,7 +39,7 @@ export default class PrivateBox {
 
   public async toString(): Promise<string> {
     log.trace('toString')
-    const pubkey = await pubkey_toString(this.pubkey)
+    const pubkey = await PrivateBox.pubkey_toString(this.pubkey)
     const box = this.box.toString()
     return `${pubkey}.${box}`
   }
@@ -49,11 +49,18 @@ export default class PrivateBox {
     const parts = data.split('.')
     if (parts.length < 2) return null
 
-    const pubkey = await pubkey_fromString(parts[0], Usage.ecdh)
+    const pubkey = await PrivateBox.pubkey_fromString(parts[0])
     if (pubkey === null) return null
     const box = SecretBox.fromString(parts.slice(1).join('.'))
     if (box === null) return null
 
     return new PrivateBox(pubkey, box)
   }
+
+  public static pubkey_toString(pubkey: CryptoKey): Promise<string> {
+    return misc.pubkey_toString(pubkey)
+  }
+  public static pubkey_fromString(pubkey: string): Promise<CryptoKey | null> {
+    return misc.pubkey_fromString(pubkey, misc.Usage.ecdh)
+  }
 }