package hash 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, optKeyHash, optSignature 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) } keyHash, err := fmtio.KeyHashFromHex(optKeyHash) if err != nil { return fmt.Errorf("parse key hash: %w", err) } sig, err := fmtio.SignatureFromHex(optSignature) if err != nil { return fmt.Errorf("parse signature: %w", err) } preimage := types.HashFn(data) leaf := types.Leaf{ Statement: types.Statement{ ShardHint: optShardHint, Checksum: *types.HashFn(preimage[:]), }, Signature: sig, KeyHash: keyHash, } leafHash := types.LeafHash(leaf.ToBinary()) fmt.Printf("%s\n", hex.Serialize(leafHash[:])) return nil }