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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/merkle"
"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)
}
message := merkle.HashFn(data)
stm := types.Statement{
ShardHint: optShardHint,
Checksum: *merkle.HashFn(message[:]),
}
sig, err := stm.Sign(priv)
if err != nil {
fmt.Errorf("sign leaf: %w", err)
}
fmt.Printf("%s\n", hex.Serialize(sig[:]))
return nil
}
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