feat: import hex keys

CHANGELOG.md

@@ -40,6 +40,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Features
 
+* (keyring) [#17424](https://github.com/cosmos/cosmos-sdk/pull/17424) Allows to import private keys encoded in hex. 
 * (x/bank) [#16795](https://github.com/cosmos/cosmos-sdk/pull/16852) Add `DenomMetadataByQueryString` query in bank module to support metadata query by query string.
 * (baseapp) [#16239](https://github.com/cosmos/cosmos-sdk/pull/16239) Add Gas Limits to allow node operators to resource bound queries.
 

client/keys/import.go

@@ -38,3 +38,19 @@ func ImportKeyCommand() *cobra.Command {
 		},
 	}
 }
+
+func ImportKeyHexCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:   "import-hex <name> <hex> <key-type>",
+		Short: "Import private keys into the local keybase",
+		Long:  "Import hex encoded private key into the local keybase.",
+		Args:  cobra.ExactArgs(3),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			clientCtx, err := client.GetClientQueryContext(cmd)
+			if err != nil {
+				return err
+			}
+			return clientCtx.Keyring.ImportPrivKeyHex(args[0], args[1], args[2])
+		},
+	}
+}

client/keys/import_test.go

@@ -115,3 +115,59 @@ HbP+c6JmeJy9JXe2rbbF1QtCX1gLqGcDQPBXiCtFvP7/8wTZtVOPj8vREzhZ9ElO
 		})
 	}
 }
+
+func Test_runImportHexCmd(t *testing.T) {
+	cdc := moduletestutil.MakeTestEncodingConfig().Codec
+	testCases := []struct {
+		name           string
+		keyringBackend string
+		hexKey         string
+		algo           string
+		expectError    bool
+	}{
+		{
+			name:           "test backend success",
+			keyringBackend: keyring.BackendTest,
+			hexKey:         "0xa3e57952e835ed30eea86a2993ac2a61c03e74f2085b3635bd94aa4d7ae0cfdf",
+			algo:           "secp256k1",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			cmd := ImportKeyHexCommand()
+			cmd.Flags().AddFlagSet(Commands().PersistentFlags())
+			mockIn := testutil.ApplyMockIODiscardOutErr(cmd)
+
+			// Now add a temporary keybase
+			kbHome := t.TempDir()
+			kb, err := keyring.New(sdk.KeyringServiceName(), tc.keyringBackend, kbHome, nil, cdc)
+			require.NoError(t, err)
+
+			clientCtx := client.Context{}.
+				WithKeyringDir(kbHome).
+				WithKeyring(kb).
+				WithInput(mockIn).
+				WithCodec(cdc)
+			ctx := context.WithValue(context.Background(), client.ClientContextKey, &clientCtx)
+
+			t.Cleanup(cleanupKeys(t, kb, "keyname1"))
+
+			defer func() {
+				_ = os.RemoveAll(kbHome)
+			}()
+
+			cmd.SetArgs([]string{
+				"keyname1", tc.hexKey, tc.algo,
+				fmt.Sprintf("--%s=%s", flags.FlagKeyringBackend, tc.keyringBackend),
+			})
+
+			err = cmd.ExecuteContext(ctx)
+			if tc.expectError {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}

client/keys/root.go

@@ -41,6 +41,7 @@ The pass backend requires GnuPG: https://gnupg.org/
 		AddKeyCommand(),
 		ExportKeyCommand(),
 		ImportKeyCommand(),
+		ImportKeyHexCommand(),
 		ListKeysCmd(),
 		ListKeyTypesCmd(),
 		ShowKeysCmd(),

crypto/keyring/keyring.go

@@ -45,6 +45,8 @@ const (
 
 	// temporary pass phrase for exporting a key during a key rename
 	passPhrase = "temp"
+	// prefix for exported hex private keys
+	hexPrefix = "0x"
 )
 
 var (
@@ -115,7 +117,8 @@ type Signer interface {
 type Importer interface {
 	// ImportPrivKey imports ASCII armored passphrase-encrypted private keys.
 	ImportPrivKey(uid, armor, passphrase string) error
-
+	// ImportPrivKeyHex imports hex encoded keys.
+	ImportPrivKeyHex(uid, privKey, algoStr string) error
 	// ImportPubKey imports ASCII armored public keys.
 	ImportPubKey(uid, armor string) error
 }
@@ -335,6 +338,29 @@ func (ks keystore) ImportPrivKey(uid, armor, passphrase string) error {
 	return nil
 }
 
+func (ks keystore) ImportPrivKeyHex(uid, privKey, algoStr string) error {
+	if _, err := ks.Key(uid); err == nil {
+		return errorsmod.Wrap(ErrOverwriteKey, uid)
+	}
+	if privKey[:2] == hexPrefix {
+		privKey = privKey[2:]
+	}
+	decodedPriv, err := hex.DecodeString(privKey)
+	if err != nil {
+		return err
+	}
+	algo, err := NewSigningAlgoFromString(algoStr, ks.options.SupportedAlgos)
+	if err != nil {
+		return err
+	}
+	priv := algo.Generate()(decodedPriv)
+	_, err = ks.writeLocalKey(uid, priv)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 func (ks keystore) ImportPubKey(uid, armor string) error {
 	if _, err := ks.Key(uid); err == nil {
 		return errorsmod.Wrap(ErrOverwriteKey, uid)

crypto/keyring/keyring_test.go

@@ -564,7 +564,65 @@ func TestImportPrivKey(t *testing.T) {
 	}
 }
 
-func TestExportImportPrivKey(t *testing.T) {
+func TestImportPrivKeyHex(t *testing.T) {
+	cdc := getCodec()
+	tests := []struct {
+		name        string
+		uid         string
+		backend     string
+		hexKey      string
+		algo        string
+		expectedErr error
+	}{
+		{
+			name:        "correct import",
+			uid:         "hexImport",
+			backend:     BackendTest,
+			hexKey:      "0xa3e57952e835ed30eea86a2993ac2a61c03e74f2085b3635bd94aa4d7ae0cfdf",
+			algo:        "secp256k1",
+			expectedErr: nil,
+		},
+		{
+			name:        "correct import without prefix",
+			uid:         "hexImport",
+			backend:     BackendTest,
+			hexKey:      "a3e57952e835ed30eea86a2993ac2a61c03e74f2085b3635bd94aa4d7ae0cfdf",
+			algo:        "secp256k1",
+			expectedErr: nil,
+		},
+		{
+			name:        "wrong hex length",
+			uid:         "hexImport",
+			backend:     BackendTest,
+			hexKey:      "0xae57952e835ed30eea86a2993ac2a61c03e74f2085b3635bd94aa4d7ae0cfdf",
+			algo:        "secp256k1",
+			expectedErr: hex.ErrLength,
+		},
+		{
+			name:        "unsupported algo",
+			uid:         "hexImport",
+			backend:     BackendTest,
+			hexKey:      "0xa3e57952e835ed30eea86a2993ac2a61c03e74f2085b3635bd94aa4d7ae0cfdf",
+			algo:        "notSupportedAlgo",
+			expectedErr: ErrUnsupportedSigningAlgo,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			kb, err := New("TestExport", tt.backend, t.TempDir(), nil, cdc)
+			require.NoError(t, err)
+			err = kb.ImportPrivKeyHex(tt.uid, tt.hexKey, tt.algo)
+			if tt.expectedErr == nil {
+				require.NoError(t, err)
+			} else {
+				require.Error(t, err)
+				require.True(t, errors.Is(err, tt.expectedErr))
+			}
+		})
+	}
+}
+
+func TestExportImportPrivKeyArmor(t *testing.T) {
 	cdc := getCodec()
 	tests := []struct {
 		name              string