396f1a0a33
git-subtree-dir: crypto/ecies git-subtree-mainline: 49a739c8d647739b3d815966f8854a4e9978df56 git-subtree-split: 7c0f4a9b18d992166452d8cd32caaefd92b26386
490 lines
11 KiB
Go
490 lines
11 KiB
Go
package ecies
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import (
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"bytes"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/sha256"
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"flag"
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"fmt"
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"io/ioutil"
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"testing"
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)
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var dumpEnc bool
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func init() {
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flDump := flag.Bool("dump", false, "write encrypted test message to file")
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flag.Parse()
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dumpEnc = *flDump
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}
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// Ensure the KDF generates appropriately sized keys.
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func TestKDF(t *testing.T) {
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msg := []byte("Hello, world")
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h := sha256.New()
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k, err := concatKDF(h, msg, nil, 64)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if len(k) != 64 {
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fmt.Printf("KDF: generated key is the wrong size (%d instead of 64\n",
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len(k))
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t.FailNow()
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}
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}
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var skLen int
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var ErrBadSharedKeys = fmt.Errorf("ecies: shared keys don't match")
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// cmpParams compares a set of ECIES parameters. We assume, as per the
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// docs, that AES is the only supported symmetric encryption algorithm.
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func cmpParams(p1, p2 *ECIESParams) bool {
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if p1.hashAlgo != p2.hashAlgo {
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return false
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} else if p1.KeyLen != p2.KeyLen {
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return false
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} else if p1.BlockSize != p2.BlockSize {
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return false
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}
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return true
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}
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// cmpPublic returns true if the two public keys represent the same pojnt.
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func cmpPublic(pub1, pub2 PublicKey) bool {
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if pub1.X == nil || pub1.Y == nil {
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fmt.Println(ErrInvalidPublicKey.Error())
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return false
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}
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if pub2.X == nil || pub2.Y == nil {
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fmt.Println(ErrInvalidPublicKey.Error())
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return false
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}
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pub1Out := elliptic.Marshal(pub1.Curve, pub1.X, pub1.Y)
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pub2Out := elliptic.Marshal(pub2.Curve, pub2.X, pub2.Y)
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return bytes.Equal(pub1Out, pub2Out)
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}
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// cmpPrivate returns true if the two private keys are the same.
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func cmpPrivate(prv1, prv2 *PrivateKey) bool {
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if prv1 == nil || prv1.D == nil {
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return false
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} else if prv2 == nil || prv2.D == nil {
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return false
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} else if prv1.D.Cmp(prv2.D) != 0 {
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return false
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} else {
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return cmpPublic(prv1.PublicKey, prv2.PublicKey)
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}
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}
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// Validate the ECDH component.
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func TestSharedKey(t *testing.T) {
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prv1, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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skLen = MaxSharedKeyLength(&prv1.PublicKey) / 2
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prv2, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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sk1, err := prv1.GenerateShared(&prv2.PublicKey, skLen, skLen)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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sk2, err := prv2.GenerateShared(&prv1.PublicKey, skLen, skLen)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if !bytes.Equal(sk1, sk2) {
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fmt.Println(ErrBadSharedKeys.Error())
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t.FailNow()
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}
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}
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// Verify that the key generation code fails when too much key data is
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// requested.
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func TestTooBigSharedKey(t *testing.T) {
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prv1, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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prv2, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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_, err = prv1.GenerateShared(&prv2.PublicKey, skLen*2, skLen*2)
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if err != ErrSharedKeyTooBig {
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fmt.Println("ecdh: shared key should be too large for curve")
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t.FailNow()
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}
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_, err = prv2.GenerateShared(&prv1.PublicKey, skLen*2, skLen*2)
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if err != ErrSharedKeyTooBig {
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fmt.Println("ecdh: shared key should be too large for curve")
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t.FailNow()
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}
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}
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// Ensure a public key can be successfully marshalled and unmarshalled, and
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// that the decoded key is the same as the original.
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func TestMarshalPublic(t *testing.T) {
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prv, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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out, err := MarshalPublic(&prv.PublicKey)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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pub, err := UnmarshalPublic(out)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if !cmpPublic(prv.PublicKey, *pub) {
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fmt.Println("ecies: failed to unmarshal public key")
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t.FailNow()
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}
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}
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// Ensure that a private key can be encoded into DER format, and that
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// the resulting key is properly parsed back into a public key.
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func TestMarshalPrivate(t *testing.T) {
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prv, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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out, err := MarshalPrivate(prv)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if dumpEnc {
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ioutil.WriteFile("test.out", out, 0644)
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}
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prv2, err := UnmarshalPrivate(out)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if !cmpPrivate(prv, prv2) {
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fmt.Println("ecdh: private key import failed")
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t.FailNow()
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}
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}
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// Ensure that a private key can be successfully encoded to PEM format, and
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// the resulting key is properly parsed back in.
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func TestPrivatePEM(t *testing.T) {
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prv, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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out, err := ExportPrivatePEM(prv)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if dumpEnc {
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ioutil.WriteFile("test.key", out, 0644)
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}
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prv2, err := ImportPrivatePEM(out)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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} else if !cmpPrivate(prv, prv2) {
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fmt.Println("ecdh: import from PEM failed")
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t.FailNow()
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}
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}
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// Ensure that a public key can be successfully encoded to PEM format, and
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// the resulting key is properly parsed back in.
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func TestPublicPEM(t *testing.T) {
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prv, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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out, err := ExportPublicPEM(&prv.PublicKey)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if dumpEnc {
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ioutil.WriteFile("test.pem", out, 0644)
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}
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pub2, err := ImportPublicPEM(out)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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} else if !cmpPublic(prv.PublicKey, *pub2) {
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fmt.Println("ecdh: import from PEM failed")
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t.FailNow()
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}
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}
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// Benchmark the generation of P256 keys.
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func BenchmarkGenerateKeyP256(b *testing.B) {
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for i := 0; i < b.N; i++ {
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if _, err := GenerateKey(rand.Reader, elliptic.P256(), nil); err != nil {
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fmt.Println(err.Error())
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b.FailNow()
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}
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}
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}
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// Benchmark the generation of P256 shared keys.
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func BenchmarkGenSharedKeyP256(b *testing.B) {
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prv, err := GenerateKey(rand.Reader, elliptic.P256(), nil)
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if err != nil {
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fmt.Println(err.Error())
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b.FailNow()
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}
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for i := 0; i < b.N; i++ {
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_, err := prv.GenerateShared(&prv.PublicKey, skLen, skLen)
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if err != nil {
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fmt.Println(err.Error())
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b.FailNow()
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}
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}
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}
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// Verify that an encrypted message can be successfully decrypted.
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func TestEncryptDecrypt(t *testing.T) {
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prv1, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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prv2, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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message := []byte("Hello, world.")
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ct, err := Encrypt(rand.Reader, &prv2.PublicKey, message, nil, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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pt, err := prv2.Decrypt(rand.Reader, ct, nil, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if !bytes.Equal(pt, message) {
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fmt.Println("ecies: plaintext doesn't match message")
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t.FailNow()
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}
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_, err = prv1.Decrypt(rand.Reader, ct, nil, nil)
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if err == nil {
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fmt.Println("ecies: encryption should not have succeeded")
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t.FailNow()
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}
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}
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// TestMarshalEncryption validates the encode/decode produces a valid
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// ECIES encryption key.
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func TestMarshalEncryption(t *testing.T) {
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prv1, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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out, err := MarshalPrivate(prv1)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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prv2, err := UnmarshalPrivate(out)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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message := []byte("Hello, world.")
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ct, err := Encrypt(rand.Reader, &prv2.PublicKey, message, nil, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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pt, err := prv2.Decrypt(rand.Reader, ct, nil, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if !bytes.Equal(pt, message) {
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fmt.Println("ecies: plaintext doesn't match message")
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t.FailNow()
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}
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_, err = prv1.Decrypt(rand.Reader, ct, nil, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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}
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type testCase struct {
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Curve elliptic.Curve
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Name string
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Expected bool
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}
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var testCases = []testCase{
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testCase{
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Curve: elliptic.P224(),
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Name: "P224",
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Expected: false,
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},
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testCase{
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Curve: elliptic.P256(),
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Name: "P256",
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Expected: true,
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},
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testCase{
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Curve: elliptic.P384(),
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Name: "P384",
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Expected: true,
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},
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testCase{
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Curve: elliptic.P521(),
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Name: "P521",
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Expected: true,
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},
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}
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// Test parameter selection for each curve, and that P224 fails automatic
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// parameter selection (see README for a discussion of P224). Ensures that
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// selecting a set of parameters automatically for the given curve works.
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func TestParamSelection(t *testing.T) {
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for _, c := range testCases {
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testParamSelection(t, c)
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}
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}
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func testParamSelection(t *testing.T, c testCase) {
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params := ParamsFromCurve(c.Curve)
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if params == nil && c.Expected {
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fmt.Printf("%s (%s)\n", ErrInvalidParams.Error(), c.Name)
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t.FailNow()
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} else if params != nil && !c.Expected {
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fmt.Printf("ecies: parameters should be invalid (%s)\n",
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c.Name)
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t.FailNow()
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}
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prv1, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Printf("%s (%s)\n", err.Error(), c.Name)
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t.FailNow()
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}
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prv2, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Printf("%s (%s)\n", err.Error(), c.Name)
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t.FailNow()
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}
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message := []byte("Hello, world.")
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ct, err := Encrypt(rand.Reader, &prv2.PublicKey, message, nil, nil)
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if err != nil {
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fmt.Printf("%s (%s)\n", err.Error(), c.Name)
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t.FailNow()
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}
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pt, err := prv2.Decrypt(rand.Reader, ct, nil, nil)
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if err != nil {
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fmt.Printf("%s (%s)\n", err.Error(), c.Name)
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t.FailNow()
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}
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if !bytes.Equal(pt, message) {
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fmt.Printf("ecies: plaintext doesn't match message (%s)\n",
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c.Name)
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t.FailNow()
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}
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_, err = prv1.Decrypt(rand.Reader, ct, nil, nil)
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if err == nil {
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fmt.Printf("ecies: encryption should not have succeeded (%s)\n",
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c.Name)
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t.FailNow()
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}
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}
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// Ensure that the basic public key validation in the decryption operation
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// works.
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func TestBasicKeyValidation(t *testing.T) {
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badBytes := []byte{0, 1, 5, 6, 7, 8, 9}
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prv, err := GenerateKey(rand.Reader, DefaultCurve, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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message := []byte("Hello, world.")
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ct, err := Encrypt(rand.Reader, &prv.PublicKey, message, nil, nil)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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for _, b := range badBytes {
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ct[0] = b
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_, err := prv.Decrypt(rand.Reader, ct, nil, nil)
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if err != ErrInvalidPublicKey {
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fmt.Println("ecies: validated an invalid key")
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t.FailNow()
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}
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}
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}
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