"wrong final block length" when Ruby decrypts data encrypted by go - ruby-on-rails

Question

I'm trying to encrypt a piece of data in Go and then store it into a database to be later pulled out and decrypted by Rails.
Here is the Go encryption code:
func Encrypt(text []byte) ([]byte, error) {
key := []byte("a very very very very secret key")
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
b := base64.StdEncoding.EncodeToString(text)
ciphertext := make([]byte, aes.BlockSize+len(b))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
cfb := cipher.NewCFBEncrypter(block, iv)
cfb.XORKeyStream(ciphertext[aes.BlockSize:], []byte(b))
return ciphertext, nil
}
And here is my Ruby code to decrypt:
def decrypt(message)
key = "a very very very very secret key"
iv = message[0, 14]
data = message[15, message.length+1]
key = Digest::SHA256.digest(key) if(key.kind_of?(String) && 32 != key.bytesize)
iv = Digest::MD5.digest(iv) if(iv.kind_of?(String) && 16 != iv.bytesize)
aes = OpenSSL::Cipher.new('AES-256-CBC')
aes.decrypt
aes.key = key
aes.iv = iv
aes.update(data) + aes.final
end
This is giving me an error message of:
OpenSSL::Cipher::CipherError: wrong final block length
Can anyone help let me know what I'm doing wrong?
Thanks!