refactor: remove unneeded methods, tests | err check fix

Removed the `SignatureBytesToHex` since its just a wrapper on std hex lib method and refactored where needed. Removed failure tests for `HexToECDSA` and `FileToECDSA` since these are just wrappers for eth crypto. And made a small fix on order of err check in `uploader.go`.

cmd/vaults/commands.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"crypto/ecdsa"
+	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -625,7 +626,7 @@ func newSignCommand() *cli.Command {
 			if err != nil {
 				return fmt.Errorf("failed to sign file: %s", err)
 			}
-			signature := signing.SignatureBytesToHex(signatureBytes)
+			signature := hex.EncodeToString(signatureBytes)
 			fmt.Println(signature)
 
 			return nil

internal/app/uploader.go

@@ -3,6 +3,7 @@ package app
 import (
 	"context"
 	"crypto/ecdsa"
+	"encoding/hex"
 	"fmt"
 	"io"
 	"os"
@@ -45,10 +46,10 @@ func (bu *VaultsUploader) Upload(
 
 	signer := signing.NewSigner(bu.privateKey)
 	signatureBytes, err := signer.SignFile(filepath)
-	signature := signing.SignatureBytesToHex(signatureBytes)
 	if err != nil {
 		return fmt.Errorf("signing the file: %s", err)
 	}
+	signature := hex.EncodeToString(signatureBytes)
 
 	filename := filepath
 	if strings.Contains(filepath, "/") {

pkg/signing/signing.go

@@ -3,7 +3,6 @@ package signing
 import (
 	"bufio"
 	"crypto/ecdsa"
-	"encoding/hex"
 	"fmt"
 	"io"
 	"os"
@@ -123,8 +122,3 @@ func (s *Signer) SignBytes(data []byte) ([]byte, error) {
 
 	return signature, nil
 }
-
-// SignatureBytesToHex converts a byte slice to a hex-encoded string.
-func SignatureBytesToHex(b []byte) string {
-	return hex.EncodeToString(b)
-}

pkg/signing/signing_test.go

@@ -2,6 +2,7 @@ package signing
 
 import (
 	"crypto/ecdsa"
+	"encoding/hex"
 	"os"
 	"testing"
 
@@ -72,7 +73,7 @@ func TestSignFile(t *testing.T) {
 			defer cleanup()
 
 			signatureBytes, err := signer.SignFile(filename)
-			signature := SignatureBytesToHex(signatureBytes)
+			signature := hex.EncodeToString(signatureBytes)
 			if tc.wantErr != "" {
 				require.Error(t, err, "Expected an error for %v", tc.name)
 				require.Contains(t, err.Error(), tc.wantErr, "SignFile() error = %v, wantErr %v", err, tc.wantErr)
@@ -111,7 +112,7 @@ func TestSignBytes(t *testing.T) {
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			signatureBytes, err := signer.SignBytes(tc.content)
-			signature := SignatureBytesToHex(signatureBytes)
+			signature := hex.EncodeToString(signatureBytes)
 			if tc.wantErr != "" {
 				require.Error(t, err, "Expected an error for %v", tc.name)
 				require.Contains(t, err.Error(), tc.wantErr, "SignBytes() error = %v, wantErr %v", err, tc.wantErr)
@@ -154,36 +155,6 @@ func TestPrivateKey(t *testing.T) {
 			},
 			wantErr: "",
 		},
-		{
-			name: "should fail to load 0x prefixed string",
-			setup: func() (pk string, filename string, cleanup func()) {
-				pk = "0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d"
-				return pk, "", func() {}
-			},
-			wantErr: "invalid hex character 'x' in private key",
-		},
-		{
-			name: "should fail to load random string",
-			setup: func() (pk string, filename string, cleanup func()) {
-				pk = "1234abcd"
-				return pk, "", func() {}
-			},
-			wantErr: "invalid length, need 256 bits",
-		},
-		{
-			name: "should fail to load empty private key file",
-			setup: func() (pk string, filename string, cleanup func()) {
-				tmpFile, _ := os.CreateTemp("", "test_file")
-				name := tmpFile.Name()
-				err := tmpFile.Close()
-				require.NoError(t, err, "Error closing file")
-				return pk, name, func() {
-					err = os.Remove(name)
-					require.NoError(t, err, "Error removing file")
-				}
-			},
-			wantErr: "key file too short, want 64 hex characters",
-		},
 	}
 
 	for _, tc := range testCases {