AES symmetric encryption crypto node.js

symmetric_crypto.coffee

crypto = require "crypto"

key = "this is my password. Make it as long as you want. But its hashed into 512 bytes."
text = "This is the text. as long as you want it"

hash = (utf8String)->
  hasher = crypto.createHash('sha512')
  hasher.update(utf8String, 'utf8')
  hexString = hasher.digest('hex')
  return hexString

encrypt = (utf8String, key) ->
  cipher = crypto.createCipher('aes-256-cbc', key)
  encryptedData = cipher.update(utf8String, 'utf8', 'hex')
  encryptedData += cipher.final('hex')
  return encryptedData

decrypt = (hexString, key) ->
  decipher = crypto.createDecipher('aes-256-cbc', key)
  decryptedData = decipher.update(hexString, 'hex', 'utf8')
  decryptedData += decipher.final('utf8')
  return decryptedData

console.log "key:", key
console.log "text:", text
hashKey = hash(key)
console.log "hashed key:", hashKey
encrypted = encrypt(text, hashKey)
console.log "encrypted:", encrypted
decrypted = decrypt(encrypted, hashKey)
console.log "decrypted:", decrypted
console.log "did it work?", decrypted == text