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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
}
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