gogost.go         |  2 +-
 gost3410/curve.go | 27 ++++++++++++++++-----------
 news.texi         |  5 +++++

diff --git a/gogost.go b/gogost.go
index c09e1b2c0a8417590c6c3eed81dafd0abf073d490fa38ce74516c811ff738261..12cf6e8a0f9c91a0f8ee95060c8395d108b984f6caae3ba404b8fea439b28ac0 100644
--- a/gogost.go
+++ b/gogost.go
@@ -1,4 +1,4 @@
 // Pure Go GOST cryptographic functions library.
 package gogost
 
-const Version = "5.10.0"
+const Version = "5.11.0"
diff --git a/gost3410/curve.go b/gost3410/curve.go
index 0bffe8ae0054efc36614dae7948452d2f09a16c6dfb158001700751d90244dc6..0713ad070d551a49c0e23d878dc7e7e725c32809f0ca62d9373f12a3005d2fce 100644
--- a/gost3410/curve.go
+++ b/gost3410/curve.go
@@ -63,17 +63,7 @@ 		B:    b,
 		X:    x,
 		Y:    y,
 	}
-	r1 := big.NewInt(0)
-	r2 := big.NewInt(0)
-	r1.Mul(c.Y, c.Y)
-	r1.Mod(r1, c.P)
-	r2.Mul(c.X, c.X)
-	r2.Add(r2, c.A)
-	r2.Mul(r2, c.X)
-	r2.Add(r2, c.B)
-	r2.Mod(r2, c.P)
-	c.pos(r2)
-	if r1.Cmp(r2) != 0 {
+	if !c.Contains(c.X, c.Y) {
 		return nil, errors.New("gogost/gost3410: invalid curve parameters")
 	}
 	if e != nil && d != nil {
@@ -86,6 +76,21 @@ 	} else {
 		c.Co = co
 	}
 	return &c, nil
+}
+
+// Is point on curve?
+func (c *Curve) Contains(x, y *big.Int) bool {
+	r1 := big.NewInt(0)
+	r2 := big.NewInt(0)
+	r1.Mul(y, y)
+	r1.Mod(r1, c.P)
+	r2.Mul(x, x)
+	r2.Add(r2, c.A)
+	r2.Mul(r2, x)
+	r2.Add(r2, c.B)
+	r2.Mod(r2, c.P)
+	c.pos(r2)
+	return r1.Cmp(r2) == 0
 }
 
 // Get the size of the point's coordinate in bytes.
diff --git a/news.texi b/news.texi
index 1c4fe8ed1b1646d9668d27915f3fe1243b008f08fd0321b5fcf9e60d8cc24fbd..735e1b3683be050e923857f98ef94278e217cb08053cc0b25938cb4b26b077ce 100644
--- a/news.texi
+++ b/news.texi
@@ -3,6 +3,11 @@ @unnumbered News
 
 @table @strong
 
+@anchor{Release 5.11.0}
+@item 5.11.0
+You can check if public key is on curve with
+@code{gost3410.Curve.Contains} method now.
+
 @anchor{Release 5.10.0}
 @item 5.10.0
     @itemize