do not throw

index.js

@@ -42,15 +42,17 @@ var create = function (fetchKey) {

    var privateKey = keys.length && !isPublicKey(keys[0]) && keys[0]
    var publicKeys = keys.length && keys.every(isPublicKey) && keys
    var encrypted = false

    if (!SSH_AUTH_SOCK && !privateKey) privateKey = DEFAULT_SSH_KEY

    if (privateKey) {
      if (privateKey.toString().indexOf('ENCRYPTED') > -1) throw new Error('Encrypted keys not supported. Setup an SSH agent or decrypt it first')
      if (privateKey.toString().indexOf('ENCRYPTED') > -1) encrypted = true
      return function sign(data, enc, cb) {
        if (typeof enc === 'function') return sign(data, null, enc)
        process.nextTick(function() {
          cb(null, crypto.createSign('RSA-SHA1').update(data).sign(privateKey, enc))
          if (encrypted) return cb(new Error('Encrypted keys not supported. Setup an SSH agent or decrypt it first'))
          cb(null, crypto.createSign('RSA-SHA256').update(data).sign(privateKey, enc))
        })
      }
    }
@@ -156,7 +158,7 @@ var create = function (fetchKey) {
        if (err) return cb(err)

        var verified = pubs.some(function(key) {
          return crypto.createVerify('RSA-SHA1').update(data).verify(key, sig, enc)
          return crypto.createVerify('RSA-SHA256').update(data).verify(key, sig, enc)
        })

        cb(null, verified)