1 files changed, 16 insertions, 0 deletions
diff --git a/src/lib-otp/otp-parity.h b/src/lib-otp/otp-parity.h
new file mode 100644
index 0000000..86ea18f
--- /dev/null
+++ b/src/lib-otp/otp-parity.h
@@ -0,0 +1,16 @@
+#ifndef OTP_PARITY_H
+#define OTP_PARITY_H
+
+extern const unsigned char parity_table[256];
+
+static inline unsigned int otp_parity(unsigned char *data)
+{
+	unsigned int i, parity = 0;
+
+	for (i = 0; i < OTP_HASH_SIZE; i++)
+		parity += parity_table[*data++];
+
+	return parity & 3;
+}
+
+#endif