package sign import ( "fmt" "strings" "git.sigsum.org/sigsum-go/internal/fmtio" "git.sigsum.org/sigsum-go/pkg/hex" "git.sigsum.org/sigsum-go/pkg/types" ) func Main(args []string, optPrivateKey string, optShardHint uint64) error { if len(args) != 0 { return fmt.Errorf("trailing arguments: %s", strings.Join(args, ", ")) } data, err := fmtio.BytesFromStdin() if err != nil { return fmt.Errorf("read stdin: %w", err) } priv, err := fmtio.SignerFromHex(optPrivateKey) if err != nil { return fmt.Errorf("parse private key: %w", err) } preimage := types.HashFn(data) stm := types.Statement{ ShardHint: optShardHint, Checksum: *types.HashFn(preimage[:]), } sig, err := stm.Sign(priv) if err != nil { fmt.Errorf("sign leaf: %w", err) } fmt.Printf("%s\n", hex.Serialize(sig[:])) return nil }