// Multihash reads all the data in r and calculates its multihash.
func (o *Options) Multihash(r io.Reader) (mh.Multihash, error) {
b, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return mh.Sum(b, o.AlgorithmCode, o.Length)
}
// Hash is the global IPFS hash function. uses multihash SHA2_256, 256 bits
func Hash(data []byte) mh.Multihash {
h, err := mh.Sum(data, mh.SHA2_256, -1)
if err != nil {
// this error can be safely ignored (panic) because multihash only fails
// from the selection of hash function. If the fn + length are valid, it
// won't error.
panic("multihash failed to hash using SHA2_256.")
}
return h
}