feat: add marshal and unmarshl methods

README.md

@@ -24,3 +24,31 @@ needed for libp2p. This is based on this [go implementation](https://github.com/
 - `type: String`, only `'RSA'` is currently supported
 - `bits: Number`
 - `cb: Function`, with the signature `function (err, privateKey)`
+
+Generates a keypair of the given type and bitsize.
+
+### `marshalPublicKey(key[, type])`
+
+- `key: crypto.rsa.RsaPublicKey`
+- `type: String`, only `'RSA'` is currently supported
+
+Converts a public key object into a protobuf serialized public key.
+
+### `unmarshalPublicKey(buf)`
+
+- `buf: Buffer`
+
+Converts a protobuf serialized public key into its  representative object.
+
+### `marshalPrivateKey(key[, type])`
+
+- `key: crypto.rsa.RsaPrivateKey`
+- `type: String`, only `'RSA'` is currently supported
+
+Converts a private key object into a protobuf serialized private key.
+
+### `unmarshalPrivateKey(buf)`
+
+- `buf: Buffer`
+
+Converts a protobuf serialized private key into its  representative object.

src/index.js

@@ -1,5 +1,10 @@
 'use strict'
 
+const protobuf = require('protocol-buffers')
+const fs = require('fs')
+const path = require('path')
+const pbm = protobuf(fs.readFileSync(path.join(__dirname, './crypto.proto')))
+
 exports.utils = require('./utils')
 const keys = exports.keys = require('./keys')
 
@@ -26,3 +31,59 @@ exports.generateEphemeralKeyPair = (curveName, cb) => {
 exports.keyStretcher = (cipherType, hashType, secret) => {
   throw new Error('Not implemented')
 }
+
+// Converts a protobuf serialized public key into its
+// representative object
+exports.unmarshalPublicKey = (buf) => {
+  const decoded = pbm.PublicKey.decode(buf)
+
+  switch (decoded.Type) {
+    case pbm.KeyType.RSA:
+      return keys.rsa.unmarshalRsaPublicKey(decoded.Data)
+    default:
+      throw new Error('invalid or unsupported key type')
+  }
+}
+
+// Converts a public key object into a protobuf serialized public key
+exports.marshalPublicKey = (key, type) => {
+  type = (type || 'rsa').toLowerCase()
+
+  // for now only rsa is supported
+  if (type !== 'rsa') {
+    throw new Error('invalid or unsupported key type')
+  }
+
+  return pbm.PublicKey.encode({
+    Type: pbm.KeyType.RSA,
+    Data: key.marshal()
+  })
+}
+
+// Converts a protobuf serialized private key into its
+// representative object
+exports.unmarshalPrivateKey = (buf) => {
+  const decoded = pbm.PrivateKey.decode(buf)
+
+  switch (decoded.Type) {
+    case pbm.KeyType.RSA:
+      return keys.rsa.unmarshalRsaPrivateKey(decoded.Data)
+    default:
+      throw new Error('invalid or unsupported key type')
+  }
+}
+
+// Converts a private key object into a protobuf serialized private key
+exports.marshalPrivateKey = (key, type) => {
+  type = (type || 'rsa').toLowerCase()
+
+  // for now only rsa is supported
+  if (type !== 'rsa') {
+    throw new Error('invalid or unsupported key type')
+  }
+
+  return pbm.PrivateKey.encode({
+    Type: pbm.KeyType.RSA,
+    Data: key.marshal()
+  })
+}

src/keys/rsa.js

@@ -25,7 +25,7 @@ class RsaPublicKey {
   }
 
   marshal () {
-    return forge.asn1.toDer(pki.publicKeyToAsn1(this._key)).bytes()
+    return new Buffer(forge.asn1.toDer(pki.publicKeyToAsn1(this._key)).bytes(), 'binary')
   }
 
   get bytes () {
@@ -74,7 +74,7 @@ class RsaPrivateKey {
   }
 
   marshal () {
-    return forge.asn1.toDer(pki.privateKeyToAsn1(this._privateKey)).bytes()
+    return new Buffer(forge.asn1.toDer(pki.privateKeyToAsn1(this._privateKey)).bytes(), 'binary')
   }
 
   get bytes () {
@@ -94,12 +94,18 @@ class RsaPrivateKey {
 }
 
 function unmarshalRsaPrivateKey (bytes) {
+  if (Buffer.isBuffer(bytes)) {
+    bytes = forge.util.createBuffer(bytes.toString('binary'))
+  }
   const key = pki.privateKeyFromAsn1(forge.asn1.fromDer(bytes))
 
   return new RsaPrivateKey(key)
 }
 
 function unmarshalRsaPublicKey (bytes) {
+  if (Buffer.isBuffer(bytes)) {
+    bytes = forge.util.createBuffer(bytes.toString('binary'))
+  }
   const key = pki.publicKeyFromAsn1(forge.asn1.fromDer(bytes))
 
   return new RsaPublicKey(key)

test/index.spec.js

@@ -4,116 +4,26 @@
 const expect = require('chai').expect
 
 const crypto = require('../src')
-const rsa = crypto.keys.rsa
 
 describe('libp2p-crypto', () => {
-  describe('generateKeyPair', () => {
-    describe('RSA', () => {
-      let key
-      before((done) => {
-        crypto.generateKeyPair('RSA', 2048, (err, _key) => {
-          if (err) return done(err)
-          key = _key
-          done()
-        })
-      })
-
-      it('generates a valid key', () => {
-        expect(
-          key
-        ).to.be.an.instanceof(
-          rsa.RsaPrivateKey
-        )
-
-        expect(
-          key.hash()
-        ).to.have.length(
-          34
-        )
-      })
-
-      it('signs', () => {
-        const pk = key.public
-        const text = key.genSecret()
-        const sig = key.sign(text)
-
-        expect(
-          pk.verify(text, sig)
-        ).to.be.eql(
-          true
-        )
-      })
-
-      it('encoding', () => {
-        const keyMarshal = key.marshal()
-        const key2 = rsa.unmarshalRsaPrivateKey(keyMarshal)
-        const keyMarshal2 = key2.marshal()
-
-        expect(
-          keyMarshal
-        ).to.be.eql(
-          keyMarshal2
-        )
-
-        const pk = key.public
-        const pkMarshal = pk.marshal()
-        const pk2 = rsa.unmarshalRsaPublicKey(pkMarshal)
-        const pkMarshal2 = pk2.marshal()
-
-        expect(
-          pkMarshal
-        ).to.be.eql(
-          pkMarshal2
-        )
-      })
-
-      describe('key equals', () => {
-        it('equals itself', () => {
-          expect(
-            key.equals(key)
-          ).to.be.eql(
-            true
-          )
-
-          expect(
-            key.public.equals(key.public)
-          ).to.be.eql(
-            true
-          )
-        })
-
-        it('not equals other key', (done) => {
-          crypto.generateKeyPair('RSA', 2048, (err, key2) => {
-            if (err) return done(err)
-
-            expect(
-              key.equals(key2)
-            ).to.be.eql(
-              false
-            )
-
-            expect(
-              key2.equals(key)
-            ).to.be.eql(
-              false
-            )
-
-            expect(
-              key.public.equals(key2.public)
-            ).to.be.eql(
-              false
-            )
-
-            expect(
-              key2.public.equals(key.public)
-            ).to.be.eql(
-              false
-            )
-
-            done()
-          })
-        })
-      })
+  let key
+  before((done) => {
+    crypto.generateKeyPair('RSA', 2048, (err, _key) => {
+      if (err) return done(err)
+      key = _key
+      done()
     })
   })
+
+  it('marshalPublicKey and unmarshalPublicKey', () => {
+    const key2 = crypto.unmarshalPublicKey(crypto.marshalPublicKey(key.public))
+
+    expect(key2.equals(key.public)).to.be.eql(true)
+  })
+
+  it('marshalPrivateKey and unmarshalPrivateKey', () => {
+    const key2 = crypto.unmarshalPrivateKey(crypto.marshalPrivateKey(key))
+
+    expect(key2.equals(key)).to.be.eql(true)
+  })
 })

test/rsa.spec.js

@@ -0,0 +1,115 @@
+/* eslint-env mocha */
+'use strict'
+
+const expect = require('chai').expect
+
+const crypto = require('../src')
+const rsa = crypto.keys.rsa
+
+describe('RSA', () => {
+  let key
+  before((done) => {
+    crypto.generateKeyPair('RSA', 2048, (err, _key) => {
+      if (err) return done(err)
+      key = _key
+      done()
+    })
+  })
+
+  it('generates a valid key', () => {
+    expect(
+      key
+    ).to.be.an.instanceof(
+      rsa.RsaPrivateKey
+    )
+
+    expect(
+      key.hash()
+    ).to.have.length(
+      34
+    )
+  })
+
+  it('signs', () => {
+    const pk = key.public
+    const text = key.genSecret()
+    const sig = key.sign(text)
+
+    expect(
+      pk.verify(text, sig)
+    ).to.be.eql(
+      true
+    )
+  })
+
+  it('encoding', () => {
+    const keyMarshal = key.marshal()
+    const key2 = rsa.unmarshalRsaPrivateKey(keyMarshal)
+    const keyMarshal2 = key2.marshal()
+
+    expect(
+      keyMarshal
+    ).to.be.eql(
+      keyMarshal2
+    )
+
+    const pk = key.public
+    const pkMarshal = pk.marshal()
+    const pk2 = rsa.unmarshalRsaPublicKey(pkMarshal)
+    const pkMarshal2 = pk2.marshal()
+
+    expect(
+      pkMarshal
+    ).to.be.eql(
+      pkMarshal2
+    )
+  })
+
+  describe('key equals', () => {
+    it('equals itself', () => {
+      expect(
+        key.equals(key)
+      ).to.be.eql(
+        true
+      )
+
+      expect(
+        key.public.equals(key.public)
+      ).to.be.eql(
+        true
+      )
+    })
+
+    it('not equals other key', (done) => {
+      crypto.generateKeyPair('RSA', 2048, (err, key2) => {
+        if (err) return done(err)
+
+        expect(
+          key.equals(key2)
+        ).to.be.eql(
+          false
+        )
+
+        expect(
+          key2.equals(key)
+        ).to.be.eql(
+          false
+        )
+
+        expect(
+          key.public.equals(key2.public)
+        ).to.be.eql(
+          false
+        )
+
+        expect(
+          key2.public.equals(key.public)
+        ).to.be.eql(
+          false
+        )
+
+        done()
+      })
+    })
+  })
+})