diff --git a/package.json b/package.json
index 9722641e..e8597432 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
   "license": "MIT",
   "dependencies": {
     "async": "^2.5.0",
-    "libp2p-crypto": "~0.8.8",
+    "libp2p-crypto": "~0.9.0",
     "multihashing-async": "~0.4.6",
     "nodeify": "^1.0.1",
     "safe-buffer": "^5.1.1",
@@ -38,6 +38,7 @@
     "aegir": "^11.0.2",
     "benchmark": "^2.1.4",
     "chai": "^4.1.0",
+    "dirty-chai": "^2.0.1",
     "pre-commit": "^1.2.2"
   },
   "pre-commit": [
@@ -61,4 +62,4 @@
     "Friedel Ziegelmayer <dignifiedquire@gmail.com>",
     "Yusef Napora <yusef@napora.org>"
   ]
-}
\ No newline at end of file
+}
diff --git a/src/crypto/index.js b/src/crypto/index.js
index ca09fbe6..7e2b4949 100644
--- a/src/crypto/index.js
+++ b/src/crypto/index.js
@@ -28,7 +28,7 @@ exports.hashAndSign = function (key, msg, callback) {
   })
 
   multihashing.digest(msg, HASH_ALGORITHM, (err, digest) => {
-    if (err) return done(err)
+    if (err) { return done(err) }
     try {
       const sig = secp256k1.sign(digest, key)
       const sigDER = secp256k1.signatureExport(sig.signature)
@@ -45,7 +45,7 @@ exports.hashAndVerify = function (key, sig, msg, callback) {
   })
 
   multihashing.digest(msg, HASH_ALGORITHM, (err, digest) => {
-    if (err) return done(err)
+    if (err) { return done(err) }
     try {
       sig = secp256k1.signatureImport(sig)
       const valid = secp256k1.verify(digest, sig, key)
diff --git a/src/index.js b/src/index.js
index e5dafd03..3d3c030d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,7 +2,7 @@
 
 const multihashing = require('multihashing-async')
 const crypto = require('./crypto')
-const pbm = require('libp2p-crypto').protobuf
+const pbm = require('libp2p-crypto').keys.pbm
 
 class Secp256k1PublicKey {
   constructor (key) {
diff --git a/test/secp256k1.spec.js b/test/secp256k1.spec.js
index 65a95e82..d68f6530 100644
--- a/test/secp256k1.spec.js
+++ b/test/secp256k1.spec.js
@@ -1,45 +1,39 @@
 /* eslint-env mocha */
 'use strict'
 
-const expect = require('chai').expect
+const chai = require('chai')
+const dirtyChai = require('dirty-chai')
+const expect = chai.expect
+chai.use(dirtyChai)
+
 const Buffer = require('safe-buffer').Buffer
 
 const secp256k1 = require('../src')
 const crypto = require('../src/crypto')
 const libp2pCrypto = require('libp2p-crypto')
-const pbm = libp2pCrypto.protobuf
+const pbm = libp2pCrypto.keys.pbm
 const randomBytes = libp2pCrypto.randomBytes
 
 describe('secp256k1 keys', () => {
   let key
   before((done) => {
     secp256k1.generateKeyPair((err, _key) => {
-      if (err) return done(err)
+      expect(err).to.not.exist()
       key = _key
       done()
     })
   })
 
   it('generates a valid key', (done) => {
-    expect(
-      key
-    ).to.be.an.instanceof(
-      secp256k1.Secp256k1PrivateKey
-    )
-    expect(
-      key.public
-    ).to.be.an.instanceof(
-      secp256k1.Secp256k1PublicKey
-    )
+    expect(key).to.be.an.instanceof(secp256k1.Secp256k1PrivateKey)
+    expect(key.public).to.be.an.instanceof(secp256k1.Secp256k1PublicKey)
 
     key.hash((err, digest) => {
-      if (err) return done(err)
-
+      expect(err).to.not.exist()
       expect(digest).to.have.length(34)
 
       key.public.hash((err, digest) => {
-        if (err) return done(err)
-
+        expect(err).to.not.exist()
         expect(digest).to.have.length(34)
         done()
       })
@@ -48,33 +42,25 @@ describe('secp256k1 keys', () => {
 
   it('optionally accepts a `bits` argument when generating a key', (done) => {
     secp256k1.generateKeyPair(256, (err, _key) => {
-      expect(err).to.not.exist
+      expect(err).to.not.exist()
       expect(_key).to.be.an.instanceof(secp256k1.Secp256k1PrivateKey)
       done()
     })
   })
 
-  it('requires a callback to generate a key', (done) => {
-    expect(() =>
-      secp256k1.generateKeyPair()
-    ).to.throw()
-    done()
+  it('requires a callback to generate a key', () => {
+    expect(() => secp256k1.generateKeyPair()).to.throw()
   })
 
   it('signs', (done) => {
     const text = randomBytes(512)
 
     key.sign(text, (err, sig) => {
-      if (err) {
-        return done(err)
-      }
+      expect(err).to.not.exist()
 
       key.public.verify(text, sig, (err, res) => {
-        if (err) {
-          return done(err)
-        }
-
-        expect(res).to.be.eql(true)
+        expect(err).to.not.exist()
+        expect(res).to.equal(true)
         done()
       })
     })
@@ -83,73 +69,36 @@ describe('secp256k1 keys', () => {
   it('encoding', (done) => {
     const keyMarshal = key.marshal()
     secp256k1.unmarshalSecp256k1PrivateKey(keyMarshal, (err, key2) => {
-      if (err) {
-        return done(err)
-      }
+      expect(err).to.not.exist()
       const keyMarshal2 = key2.marshal()
 
-      expect(
-        keyMarshal
-      ).to.be.eql(
-        keyMarshal2
-      )
+      expect(keyMarshal).to.eql(keyMarshal2)
 
       const pk = key.public
       const pkMarshal = pk.marshal()
       const pk2 = secp256k1.unmarshalSecp256k1PublicKey(pkMarshal)
       const pkMarshal2 = pk2.marshal()
 
-      expect(
-        pkMarshal
-      ).to.be.eql(
-        pkMarshal2
-      )
+      expect(pkMarshal).to.eql(pkMarshal2)
       done()
     })
   })
 
   describe('key equals', () => {
     it('equals itself', () => {
-      expect(
-        key.equals(key)
-      ).to.be.eql(
-        true
-      )
-
-      expect(
-        key.public.equals(key.public)
-      ).to.be.eql(
-        true
-      )
+      expect(key.equals(key)).to.eql(true)
+
+      expect(key.public.equals(key.public)).to.eql(true)
     })
 
     it('not equals other key', (done) => {
       secp256k1.generateKeyPair(256, (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
-        )
+        expect(err).to.not.exist()
+
+        expect(key.equals(key2)).to.eql(false)
+        expect(key2.equals(key)).to.eql(false)
+        expect(key.public.equals(key2.public)).to.eql(false)
+        expect(key2.public.equals(key.public)).to.eql(false)
         done()
       })
     })
@@ -158,15 +107,11 @@ describe('secp256k1 keys', () => {
   it('sign and verify', (done) => {
     const data = Buffer.from('hello world')
     key.sign(data, (err, sig) => {
-      if (err) {
-        return done(err)
-      }
+      expect(err).to.not.exist()
 
       key.public.verify(data, sig, (err, valid) => {
-        if (err) {
-          return done(err)
-        }
-        expect(valid).to.be.eql(true)
+        expect(err).to.not.exist()
+        expect(valid).to.eql(true)
         done()
       })
     })
@@ -175,15 +120,11 @@ describe('secp256k1 keys', () => {
   it('fails to verify for different data', (done) => {
     const data = Buffer.from('hello world')
     key.sign(data, (err, sig) => {
-      if (err) {
-        return done(err)
-      }
+      expect(err).to.not.exist()
 
       key.public.verify(Buffer.from('hello'), sig, (err, valid) => {
-        if (err) {
-          return done(err)
-        }
-        expect(valid).to.be.eql(false)
+        expect(err).to.not.exist()
+        expect(valid).to.eql(false)
         done()
       })
     })
@@ -206,8 +147,8 @@ describe('key generation error', () => {
 
   it('returns an error if key generation fails', (done) => {
     secp256k1.generateKeyPair((err, key) => {
-      expect(err).to.exist
-      expect(key).to.not.exist
+      expect(err).to.exist()
+      expect(key).to.not.exist()
       done()
     })
   })
@@ -229,19 +170,20 @@ describe('handles generation of invalid key', () => {
 
   it('returns an error if key generator returns an invalid key', (done) => {
     secp256k1.generateKeyPair((err, key) => {
-      expect(err).to.exist
-      expect(key).to.not.exist
+      expect(err).to.exist()
+      expect(key).to.not.exist()
       done()
     })
   })
 })
 
 describe('crypto functions', () => {
-  let privKey, pubKey
+  let privKey
+  let pubKey
 
   before((done) => {
     crypto.generateKey((err, _key) => {
-      if (err) return done(err)
+      expect(err).to.not.exist()
       privKey = _key
       pubKey = crypto.computePublicKey(privKey)
       done()
@@ -257,22 +199,17 @@ describe('crypto functions', () => {
   })
 
   it('does not validate an invalid key', (done) => {
-    expect(() => {
-      crypto.validatePublicKey(Buffer.from('42'))
-    }).to.throw()
-
-    expect(() => {
-      crypto.validatePrivateKey(Buffer.from('42'))
-    }).to.throw()
+    expect(() => crypto.validatePublicKey(Buffer.from('42'))).to.throw()
+    expect(() => crypto.validatePrivateKey(Buffer.from('42'))).to.throw()
     done()
   })
 
   it('validates a correct signature', (done) => {
     crypto.hashAndSign(privKey, Buffer.from('hello'), (err, sig) => {
-      if (err) return done(err)
+      expect(err).to.not.exist()
       crypto.hashAndVerify(pubKey, sig, Buffer.from('hello'), (err, valid) => {
-        if (err) return done(err)
-        expect(valid).to.be.eql(true)
+        expect(err).to.not.exist()
+        expect(valid).to.equal(true)
         done()
       })
     })
@@ -280,27 +217,27 @@ describe('crypto functions', () => {
 
   it('errors if given a null buffer to sign', (done) => {
     crypto.hashAndSign(privKey, null, (err, sig) => {
-      expect(err).to.exist
-      expect(sig).to.not.exist
+      expect(err).to.exist()
+      expect(sig).to.not.exist()
       done()
     })
   })
 
   it('errors when signing with an invalid key', (done) => {
     crypto.hashAndSign(Buffer.from('42'), Buffer.from('Hello'), (err, sig) => {
-      expect(err).to.exist
-      expect(sig).to.not.exist
+      expect(err).to.exist()
+      expect(sig).to.not.exist()
       done()
     })
   })
 
   it('errors if given a null buffer to validate', (done) => {
     crypto.hashAndSign(privKey, Buffer.from('hello'), (err, sig) => {
-      if (err) return done(err)
+      expect(err).to.not.exist()
 
       crypto.hashAndVerify(privKey, sig, null, (err, valid) => {
-        expect(err).to.exist
-        expect(valid).to.not.exist
+        expect(err).to.exist()
+        expect(valid).to.not.exist()
         done()
       })
     })
@@ -308,40 +245,36 @@ describe('crypto functions', () => {
 
   it('errors when validating a message with an invalid signature', (done) => {
     crypto.hashAndVerify(pubKey, Buffer.from('invalid-sig'), Buffer.from('hello'), (err, valid) => {
-      expect(err).to.exist
-      expect(valid).to.not.exist
+      expect(err).to.exist()
+      expect(valid).to.not.exist()
       done()
     })
   })
 
   it('errors when signing with an invalid key', (done) => {
     crypto.hashAndSign(Buffer.from('42'), Buffer.from('Hello'), (err, sig) => {
-      expect(err).to.exist
-      expect(sig).to.not.exist
+      expect(err).to.exist()
+      expect(sig).to.not.exist()
       done()
     })
   })
 
   it('throws when compressing an invalid public key', (done) => {
-    expect(() => {
-      crypto.compressPublicKey(Buffer.from('42'))
-    }).to.throw()
+    expect(() => crypto.compressPublicKey(Buffer.from('42'))).to.throw()
     done()
   })
 
   it('throws when decompressing an invalid public key', (done) => {
-    expect(() => {
-      crypto.decompressPublicKey(Buffer.from('42'))
-    }).to.throw()
+    expect(() => crypto.decompressPublicKey(Buffer.from('42'))).to.throw()
     done()
   })
 
   it('compresses/decompresses a valid public key', (done) => {
     const decompressed = crypto.decompressPublicKey(pubKey)
-    expect(decompressed).to.exist
+    expect(decompressed).to.exist()
     expect(decompressed.length).to.be.eql(65)
     const recompressed = crypto.compressPublicKey(decompressed)
-    expect(recompressed).to.be.eql(pubKey)
+    expect(recompressed).to.eql(pubKey)
     done()
   })
 })
@@ -353,13 +286,13 @@ describe('go interop', () => {
     // we need to first extract the key data from the protobuf, which is
     // normally handled by js-libp2p-crypto
     const decoded = pbm.PrivateKey.decode(fixtures.privateKey)
-    expect(decoded.Type).to.be.eql(pbm.KeyType.Secp256k1)
+    expect(decoded.Type).to.eql(pbm.KeyType.Secp256k1)
 
     secp256k1.unmarshalSecp256k1PrivateKey(decoded.Data, (err, key) => {
-      if (err) return done(err)
+      expect(err).to.not.exist()
 
       expect(key).to.be.an.instanceof(secp256k1.Secp256k1PrivateKey)
-      expect(key.bytes).to.be.eql(fixtures.privateKey)
+      expect(key.bytes).to.eql(fixtures.privateKey)
       done()
     })
   })
@@ -370,20 +303,20 @@ describe('go interop', () => {
 
     const key = secp256k1.unmarshalSecp256k1PublicKey(decoded.Data)
     expect(key).to.be.an.instanceof(secp256k1.Secp256k1PublicKey)
-    expect(key.bytes).to.be.eql(fixtures.publicKey)
+    expect(key.bytes).to.eql(fixtures.publicKey)
     done()
   })
 
   it('generates the same signature as go-libp2p-crypto', (done) => {
     const decoded = pbm.PrivateKey.decode(fixtures.privateKey)
-    expect(decoded.Type).to.be.eql(pbm.KeyType.Secp256k1)
+    expect(decoded.Type).to.eql(pbm.KeyType.Secp256k1)
 
     secp256k1.unmarshalSecp256k1PrivateKey(decoded.Data, (err, key) => {
-      if (err) return done(err)
+      expect(err).to.not.exist()
 
       key.sign(fixtures.message, (err, sig) => {
-        if (err) return done(err)
-        expect(sig).to.be.eql(fixtures.signature)
+        expect(err).to.not.exist()
+        expect(sig).to.eql(fixtures.signature)
         done()
       })
     })