accounts: add ErrDecrypt

4 files changed, 6 insertions, 7 deletions

diff --git a/accounts/account_manager.go b/accounts/account_manager.go
index dc9f40048..2489d29a0 100644
--- a/accounts/account_manager.go
+++ b/accounts/account_manager.go
@@ -38,6 +38,7 @@ import (
 var (
 	ErrLocked  = errors.New("account is locked")
 	ErrNoMatch = errors.New("no key for given address or file")
+	ErrDecrypt = errors.New("could not decrypt key with given passphrase")
 )
 
 type Account struct {
diff --git a/accounts/key_store_passphrase.go b/accounts/key_store_passphrase.go
index 0cc598bbc..87c7cb98f 100644
--- a/accounts/key_store_passphrase.go
+++ b/accounts/key_store_passphrase.go
@@ -31,7 +31,6 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"path/filepath"
@@ -214,7 +213,7 @@ func decryptKeyV3(keyProtected *encryptedKeyJSONV3, auth string) (keyBytes []byt
 
 	calculatedMAC := crypto.Keccak256(derivedKey[16:32], cipherText)
 	if !bytes.Equal(calculatedMAC, mac) {
-		return nil, nil, errors.New("Decryption failed: MAC mismatch")
+		return nil, nil, ErrDecrypt
 	}
 
 	plainText, err := aesCTRXOR(derivedKey[:16], cipherText, iv)
@@ -248,7 +247,7 @@ func decryptKeyV1(keyProtected *encryptedKeyJSONV1, auth string) (keyBytes []byt
 
 	calculatedMAC := crypto.Keccak256(derivedKey[16:32], cipherText)
 	if !bytes.Equal(calculatedMAC, mac) {
-		return nil, nil, errors.New("Decryption failed: MAC mismatch")
+		return nil, nil, ErrDecrypt
 	}
 
 	plainText, err := aesCBCDecrypt(crypto.Keccak256(derivedKey[:16])[:16], cipherText, iv)
diff --git a/accounts/key_store_test.go b/accounts/key_store_test.go
index 01bf1b50a..b0417c87e 100644
--- a/accounts/key_store_test.go
+++ b/accounts/key_store_test.go
@@ -94,8 +94,8 @@ func TestKeyStorePassphraseDecryptionFail(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if _, err = ks.GetKey(k1.Address, account.File, "bar"); err == nil {
-		t.Fatal("no error for invalid passphrase")
+	if _, err = ks.GetKey(k1.Address, account.File, "bar"); err != ErrDecrypt {
+		t.Fatalf("wrong error for invalid passphrase\ngot %q\nwant %q", err, ErrDecrypt)
 	}
 }
 
diff --git a/accounts/presale.go b/accounts/presale.go
index 86bfc519c..bb82821b9 100644
--- a/accounts/presale.go
+++ b/accounts/presale.go
@@ -22,7 +22,6 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
-	"errors"
 	"fmt"
 
 	"github.com/ethereum/go-ethereum/crypto"
@@ -106,7 +105,7 @@ func aesCBCDecrypt(key, cipherText, iv []byte) ([]byte, error) {
 	decrypter.CryptBlocks(paddedPlaintext, cipherText)
 	plaintext := pkcs7Unpad(paddedPlaintext)
 	if plaintext == nil {
-		err = errors.New("Decryption failed: PKCS7Unpad failed after AES decryption")
+		return nil, ErrDecrypt
 	}
 	return plaintext, err
 }