func run() error {
if err := parseFlags(opts); err != nil {
return err
}
// parse the given checksum
expect, err := getInput(opts)
if err != nil {
return err
}
// have to read all of it before we output any of it :/
input, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return err
}
// calculate the checksum of the input
actual, err := mh.Sum(input, opts.AlgorithmCode, opts.Length)
if err != nil {
return err
}
// ensure checksums match
if !bytes.Equal(expect, actual) {
return mhopts.ErrMatch
}
// ok, checksums matched, write it out
if !quiet {
_, err = os.Stdout.Write(input)
}
return err
}
// 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)
}
func (id ID) Hash() mh.Multihash {
// TODO: Use go-ipfs-util.DefaultIpfsHash
// https://github.com/ipfs/go-ipfs-util/pull/1
hash, err := mh.Sum(id.asBlockData(), mh.SHA2_256, -1)
// Mulithash should only fail if an invalid len or code was passed.
if err != nil {
panic(err)
}
return hash
}
func TestKey(t *testing.T) {
h1, err := mh.Sum([]byte("beep boop"), mh.SHA2_256, -1)
if err != nil {
t.Error(err)
}
k1 := Key(h1)
h2 := mh.Multihash(k1)
k2 := Key(h2)
if !bytes.Equal(h1, h2) {
t.Error("Multihashes not equal.")
}
if k1 != k2 {
t.Error("Keys not equal.")
}
}