1 files changed, 23 insertions, 0 deletions
diff --git a/src/protocols/ec25519_fhmqvc/ec25519_fhmqvc.h b/src/protocols/ec25519_fhmqvc/ec25519_fhmqvc.h
index 8dd8456..e2034bd 100644
--- a/src/protocols/ec25519_fhmqvc/ec25519_fhmqvc.h
+++ b/src/protocols/ec25519_fhmqvc/ec25519_fhmqvc.h
@@ -138,3 +138,26 @@ static inline void hexdump(char out[65], const unsigned char d[32]) {
 static inline bool is_session_valid(const protocol_session_t *session) {
 	return (session->method && session->method->provider->session_is_valid(session->method_state));
 }
+
+
+/** Devides a secret key by 8 (for some optimizations) */
+static inline bool divide_key(ecc_int256_t *key) {
+	uint8_t c = 0, c2;
+	ssize_t i;
+
+	for (i = 31; i >= 0; i--) {
+		c2 = key->p[i] << 5;
+		key->p[i] = (key->p[i] >> 3) | c;
+		c = c2;
+	}
+
+	return (c == 0);
+}
+
+/** Multiplies a point by 8 */
+static inline void octuple_point(ecc_25519_work_t *p) {
+	ecc_25519_work_t work;
+	ecc_25519_double(&work, p);
+	ecc_25519_double(&work, &work);
+	ecc_25519_double(p, &work);
+}