Added Encrypt & Decrypt using the ECIES w/ tests

crypto/encrypt_decrypt_test.go

@@ -0,0 +1,40 @@
+package crypto
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/ethutil"
+)
+
+func TestBox(t *testing.T) {
+	prv1 := ethutil.Hex2Bytes("4b50fa71f5c3eeb8fdc452224b2395af2fcc3d125e06c32c82e048c0559db03f")
+	prv2 := ethutil.Hex2Bytes("d0b043b4c5d657670778242d82d68a29d25d7d711127d17b8e299f156dad361a")
+	pub2 := ethutil.Hex2Bytes("04bd27a63c91fe3233c5777e6d3d7b39204d398c8f92655947eb5a373d46e1688f022a1632d264725cbc7dc43ee1cfebde42fa0a86d08b55d2acfbb5e9b3b48dc5")
+
+	message := []byte("Hello, world.")
+	ct, err := Encrypt(pub2, message)
+	if err != nil {
+		fmt.Println(err.Error())
+		t.FailNow()
+	}
+
+	pt, err := Decrypt(prv2, ct)
+	if err != nil {
+		fmt.Println(err.Error())
+		t.FailNow()
+	}
+
+	if !bytes.Equal(pt, message) {
+		fmt.Println("ecies: plaintext doesn't match message")
+		t.FailNow()
+	}
+
+	_, err = Decrypt(prv1, pt)
+	if err == nil {
+		fmt.Println("ecies: encryption should not have succeeded")
+		t.FailNow()
+	}
+
+}