Split passwd into its' own subpackage

irc/passwd/unsalted.go

@@ -0,0 +1,45 @@
+// Copyright (c) 2012-2014 Jeremy Latt
+// released under the MIT license
+
+package passwd
+
+import (
+	"encoding/base64"
+	"errors"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+var (
+	// ErrEmptyPassword means that an empty password was given.
+	ErrEmptyPassword = errors.New("empty password")
+)
+
+// GenerateEncodedPassword returns an encrypted password, encoded into a string with base64.
+func GenerateEncodedPassword(passwd string) (encoded string, err error) {
+	if passwd == "" {
+		err = ErrEmptyPassword
+		return
+	}
+	bcrypted, err := bcrypt.GenerateFromPassword([]byte(passwd), bcrypt.MinCost)
+	if err != nil {
+		return
+	}
+	encoded = base64.StdEncoding.EncodeToString(bcrypted)
+	return
+}
+
+// DecodePasswordHash takes a base64-encoded password hash and returns the appropriate bytes.
+func DecodePasswordHash(encoded string) (decoded []byte, err error) {
+	if encoded == "" {
+		err = ErrEmptyPassword
+		return
+	}
+	decoded, err = base64.StdEncoding.DecodeString(encoded)
+	return
+}
+
+// ComparePassword compares a given password with the given hash.
+func ComparePassword(hash, password []byte) error {
+	return bcrypt.CompareHashAndPassword(hash, password)
+}