Slightly more descriptive errors

[gogost.git] / gost3410 / curve.go

diff --git a/gost3410/curve.go b/gost3410/curve.go
index 47f964b583a66bf9b735b73c671b0ca0e97873e3..b5fa052c9812867ca5e034700061a5ec147654be 100644 (file)
--- a/gost3410/curve.go
+++ b/gost3410/curve.go
@@ -79,7 +79,7 @@ func NewCurve(p, q, a, b, x, y, e, d *big.Int) (*Curve, error) {
        r2.Mod(r2, c.P)
        c.pos(r2)
        if r1.Cmp(r2) != 0 {
-               return nil, errors.New("Invalid curve parameters")
+               return nil, errors.New("gogost/gost3410: invalid curve parameters")
        }
        if e != nil && d != nil {
                c.E = e
@@ -131,7 +131,7 @@ func (c *Curve) add(p1x, p1y, p2x, p2y *big.Int) {
 
 func (c *Curve) Exp(degree, xS, yS *big.Int) (*big.Int, *big.Int, error) {
        if degree.Cmp(zero) == 0 {
-               return nil, nil, errors.New("Bad degree value")
+               return nil, nil, errors.New("gogost/gost3410: zero degree value")
        }
        dg := big.NewInt(0).Sub(degree, bigInt1)
        tx := big.NewInt(0).Set(xS)