feat: add crypto transmission error (#17)

* feat: add crypto transmission error

* docs: add error to crypto readme

src/crypto/README.md

@@ -85,6 +85,7 @@ Common crypto errors come with the interface, and can be imported directly. All
 ```js
 const {
   InvalidCryptoExchangeError,
+  InvalidCryptoTransmissionError,
   UnexpectedPeerError
 } = require('libp2p-interfaces/src/crypto/errors')
 
@@ -95,4 +96,5 @@ console.log(error.code === UnexpectedPeerError.code) // true
 ### Error Types
 
 - `InvalidCryptoExchangeError` - Should be thrown when a peer provides data that is insufficient to finish the crypto exchange.
+- `InvalidCryptoTransmissionError` - Should be thrown when an error occurs during encryption/decryption.
 - `UnexpectedPeerError` - Should be thrown when the expected peer id does not match the peer id determined via the crypto exchange.

src/crypto/errors.js

@@ -22,7 +22,19 @@ class InvalidCryptoExchangeError extends Error {
   }
 }
 
+class InvalidCryptoTransmissionError extends Error {
+  constructor (message = 'Invalid crypto transmission') {
+    super(message)
+    this.code = InvalidCryptoTransmissionError.code
+  }
+
+  static get code () {
+    return 'ERR_INVALID_CRYPTO_TRANSMISSION'
+  }
+}
+
 module.exports = {
   UnexpectedPeerError,
-  InvalidCryptoExchangeError
+  InvalidCryptoExchangeError,
+  InvalidCryptoTransmissionError
 }