feat(cli): Tool to display all formats of public key (#2426)

cli/commands/deposit/commands.go

@@ -39,6 +39,7 @@ func Commands(chainSpec chain.Spec) *cobra.Command {
 	cmd.AddCommand(
 		NewValidateDeposit(chainSpec),
 		NewCreateValidator(chainSpec),
+		GetValidatorKeysCmd(),
 	)
 
 	return cmd

cli/commands/deposit/keys.go

@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: BUSL-1.1
+//
+// Copyright (C) 2025, Berachain Foundation. All rights reserved.
+// Use of this software is governed by the Business Source License included
+// in the LICENSE file of this repository and at www.mariadb.com/bsl11.
+//
+// ANY USE OF THE LICENSED WORK IN VIOLATION OF THIS LICENSE WILL AUTOMATICALLY
+// TERMINATE YOUR RIGHTS UNDER THIS LICENSE FOR THE CURRENT AND ALL OTHER
+// VERSIONS OF THE LICENSED WORK.
+//
+// THIS LICENSE DOES NOT GRANT YOU ANY RIGHT IN ANY TRADEMARK OR LOGO OF
+// LICENSOR OR ITS AFFILIATES (PROVIDED THAT YOU MAY USE A TRADEMARK OR LOGO OF
+// LICENSOR AS EXPRESSLY REQUIRED BY THIS LICENSE).
+//
+// TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE LICENSED WORK IS PROVIDED ON
+// AN “AS IS” BASIS. LICENSOR HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS,
+// EXPRESS OR IMPLIED, INCLUDING (WITHOUT LIMITATION) WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND
+// TITLE.
+
+package deposit
+
+import (
+	"encoding/base64"
+
+	"github.com/berachain/beacon-kit/cli/context"
+	"github.com/berachain/beacon-kit/errors"
+	"github.com/berachain/beacon-kit/node-core/components"
+	"github.com/berachain/beacon-kit/node-core/components/signer"
+	"github.com/cometbft/cometbft/crypto/bls12381"
+	"github.com/spf13/cobra"
+)
+
+// GetValidatorKeysCmd returns a command that returns the validator public key in different formats
+// for the given private key files.
+//
+//nolint:lll // reads better if long description is one line.
+func GetValidatorKeysCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "validator-keys",
+		Short: "Outputs the validator public key in different formats.",
+		Long:  `Outputs the validator public key in formats of Comet address, Comet pubkey, and Eth/Beacon pubkey. Uses the private key file specified as the value of "priv_validator_key_file" in the config.toml file in the beacond HOMEDIR.`,
+		Args:  cobra.ExactArgs(0),
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			// Get the BLS signer.
+			blsSignerI, err := components.ProvideBlsSigner(
+				components.BlsSignerInput{
+					AppOpts: context.GetViperFromCmd(cmd),
+				},
+			)
+			if err != nil {
+				return errors.Wrap(err, "failed to initialize BLS signer from validator files")
+			}
+			blsSigner, ok := blsSignerI.(*signer.BLSSigner)
+			if !ok {
+				return errors.New("failed to assert BLS signer type")
+			}
+
+			// Get the comet public key.
+			cometKey, err := blsSigner.PrivValidator.GetPubKey()
+			if err != nil {
+				return errors.Wrap(err, "failed to get comet public key from bls signer")
+			}
+
+			// Get the comet BLS public key.
+			blsKey, err := bls12381.NewPublicKeyFromBytes(cometKey.Bytes())
+			if err != nil {
+				return errors.Wrap(err, "failed to create BLS key from bytes")
+			}
+
+			// Output the validator public key in different formats.
+			cmd.Printf(
+				"Comet Address:\n%s\n\n",
+				cometKey.Address(),
+			)
+			cmd.Printf(
+				"Comet Pubkey (Uncompressed Base64):\n%s\n\n",
+				base64.StdEncoding.EncodeToString(blsKey.Bytes()),
+			)
+			cmd.Printf(
+				"Eth/Beacon Pubkey (Compressed 48-byte Hex):\n%s\n",
+				blsSigner.PublicKey().String(),
+			)
+
+			return nil
+		},
+	}
+
+	return cmd
+}