1 files changed, 47 insertions, 0 deletions
diff --git a/src/crypto/elliptic/p224_test.go b/src/crypto/elliptic/p224_test.go
new file mode 100644
index 000000000..4b26d1610
--- /dev/null
+++ b/src/crypto/elliptic/p224_test.go
@@ -0,0 +1,47 @@
+// Copyright 2012 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package elliptic
+
+import (
+	"math/big"
+	"testing"
+)
+
+var toFromBigTests = []string{
+	"0",
+	"1",
+	"23",
+	"b70e0cb46bb4bf7f321390b94a03c1d356c01122343280d6105c1d21",
+	"706a46d476dcb76798e6046d89474788d164c18032d268fd10704fa6",
+}
+
+func p224AlternativeToBig(in *p224FieldElement) *big.Int {
+	ret := new(big.Int)
+	tmp := new(big.Int)
+
+	for i := uint(0); i < 8; i++ {
+		tmp.SetInt64(int64(in[i]))
+		tmp.Lsh(tmp, 28*i)
+		ret.Add(ret, tmp)
+	}
+	ret.Mod(ret, p224.P)
+	return ret
+}
+
+func TestToFromBig(t *testing.T) {
+	for i, test := range toFromBigTests {
+		n, _ := new(big.Int).SetString(test, 16)
+		var x p224FieldElement
+		p224FromBig(&x, n)
+		m := p224ToBig(&x)
+		if n.Cmp(m) != 0 {
+			t.Errorf("#%d: %x != %x", i, n, m)
+		}
+		q := p224AlternativeToBig(&x)
+		if n.Cmp(q) != 0 {
+			t.Errorf("#%d: %x != %x (alternative)", i, n, m)
+		}
+	}
+}