// SHA256sum creates the sha256 checksum for the specified file.
func SHA256sum(c *gc.C, path string) (int64, string) {
if strings.HasPrefix(path, "file://") {
path = path[len("file://"):]
}
hash, size, err := utils.ReadFileSHA256(path)
c.Assert(err, gc.IsNil)
return size, hash
}
// verify returns an error unless a file exists at path with a hex-encoded
// SHA256 matching digest.
func verify(path, digest string) error {
hash, _, err := utils.ReadFileSHA256(path)
if err != nil {
return err
}
if hash != digest {
return fmt.Errorf("bad SHA256 of %q", path)
}
return nil
}