Make CheckPassword a method

This works better in godoc

1 files changed, 4 insertions, 4 deletions

diff --git a/internal/cryptoutil/cryptoutil.go b/internal/cryptoutil/cryptoutil.go
index c5d2a86..b58282b 100644
--- a/internal/cryptoutil/cryptoutil.go
+++ b/internal/cryptoutil/cryptoutil.go
@@ -62,7 +62,7 @@ type EncryptionKey []byte
 // An EncryptedMessage is encrypted with AES-256-CTR-HMAC-SHA256.
 type EncryptedMessage []byte
 
-// HashIter runs pbkdf2-sha256 for iter iterations. Useful for benchmarking.
+// HashIter runs PBKDF2-SHA256 for iter iterations. Useful for benchmarking.
 func HashIter(password string, salt []byte, iter int) ([]byte, error) {
 	return pbkdf2.Key(sha256.New, password, salt, iter, sha256.Size)
 }
@@ -94,10 +94,10 @@ func Hash(password string) (PasswordHash, error) {
 	return append(salt, pwHash...), nil
 }
 
-// CheckPassword verifies password against expectedHash and returns an
+// CheckPassword verifies password against a PasswordHash and returns an
 // EncryptionKey derived from the password if successful.
-func CheckPassword(password string, expectedHash PasswordHash) (RawKey, error) {
-	salt, expectedHash := expectedHash[:saltSize], expectedHash[saltSize:]
+func (h PasswordHash) CheckPassword(password string) (RawKey, error) {
+	salt, expectedHash := h[:saltSize], h[saltSize:]
 	key, pwHash, err := hashWithSalt(password, salt)
 	if err != nil {
 		return RawKey{}, err