some linting

pkg/crypto/crypto.go

@@ -9,6 +9,10 @@ import (
 	"io"
 )
 
+var (
+	ErrCipherTextBlockSize = errors.New("ciphertext block size is too short")
+)
+
 func EncryptAES(data string, key string) (string, error) {
 	encrypted, err := EncryptBytesAES([]byte(data), key)
 	if err != nil {
@@ -55,8 +59,7 @@ func DecryptBytesAES(cipherText []byte, key string) ([]byte, error) {
 	}
 
 	if len(cipherText) < aes.BlockSize {
-		err = errors.New("Ciphertext block size is too short!")
-		return nil, err
+		return nil, ErrCipherTextBlockSize
 	}
 	iv := cipherText[:aes.BlockSize]
 	cipherText = cipherText[aes.BlockSize:]

pkg/crypto/hash.go

@@ -4,12 +4,17 @@ import (
 	"crypto/sha256"
 	"crypto/sha512"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"hash"
 
 	"gopkg.in/square/go-jose.v2"
 )
 
+var (
+	ErrUnsupportedAlgorithm = errors.New("unsupported signing algorithm")
+)
+
 func GetHashAlgorithm(sigAlgorithm jose.SignatureAlgorithm) (hash.Hash, error) {
 	switch sigAlgorithm {
 	case jose.RS256, jose.ES256, jose.PS256:
@@ -19,7 +24,7 @@ func GetHashAlgorithm(sigAlgorithm jose.SignatureAlgorithm) (hash.Hash, error) {
 	case jose.RS512, jose.ES512, jose.PS512:
 		return sha512.New(), nil
 	default:
-		return nil, fmt.Errorf("oidc: unsupported signing algorithm %q", sigAlgorithm)
+		return nil, fmt.Errorf("%w: %q", ErrUnsupportedAlgorithm, sigAlgorithm)
 	}
 }