// Copyright 2016 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 ed25519 import ( "bufio" "bytes" "compress/gzip" "crypto" "crypto/internal/boring" "crypto/rand" "crypto/sha512" "encoding/hex" "internal/testenv" "log" "os" "strings" "testing" ) func Example_ed25519ctx() { pub, priv, err := GenerateKey(nil) if err != nil { log.Fatal(err) } msg := []byte("The quick brown fox jumps over the lazy dog") sig, err := priv.Sign(nil, msg, &Options{ Context: "Example_ed25519ctx", }) if err != nil { log.Fatal(err) } if err := VerifyWithOptions(pub, msg, sig, &Options{ Context: "Example_ed25519ctx", }); err != nil { log.Fatal("invalid signature") } } type zeroReader struct{} func (zeroReader) Read(buf []byte) (int, error) { clear(buf) return len(buf), nil } func TestSignVerify(t *testing.T) { var zero zeroReader public, private, _ := GenerateKey(zero) message := []byte("test message") sig := Sign(private, message) if !Verify(public, message, sig) { t.Errorf("valid signature rejected") } wrongMessage := []byte("wrong message") if Verify(public, wrongMessage, sig) { t.Errorf("signature of different message accepted") } } func TestSignVerifyHashed(t *testing.T) { // From RFC 8032, Section 7.3 key, _ := hex.DecodeString("833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf") expectedSig, _ := hex.DecodeString("98a70222f0b8121aa9d30f813d683f809e462b469c7ff87639499bb94e6dae4131f85042463c2a355a2003d062adf5aaa10b8c61e636062aaad11c2a26083406") message, _ := hex.DecodeString("616263") private := PrivateKey(key) public := private.Public().(PublicKey) hash := sha512.Sum512(message) sig, err := private.Sign(nil, hash[:], crypto.SHA512) if err != nil { t.Fatal(err) } if !bytes.Equal(sig, expectedSig) { t.Error("signature doesn't match test vector") } sig, err = private.Sign(nil, hash[:], &Options{Hash: crypto.SHA512}) if err != nil { t.Fatal(err) } if !bytes.Equal(sig, expectedSig) { t.Error("signature doesn't match test vector") } if err := VerifyWithOptions(public, hash[:], sig, &Options{Hash: crypto.SHA512}); err != nil { t.Errorf("valid signature rejected: %v", err) } if err := VerifyWithOptions(public, hash[:], sig, &Options{Hash: crypto.SHA256}); err == nil { t.Errorf("expected error for wrong hash") } wrongHash := sha512.Sum512([]byte("wrong message")) if VerifyWithOptions(public, wrongHash[:], sig, &Options{Hash: crypto.SHA512}) == nil { t.Errorf("signature of different message accepted") } sig[0] ^= 0xff if VerifyWithOptions(public, hash[:], sig, &Options{Hash: crypto.SHA512}) == nil { t.Errorf("invalid signature accepted") } sig[0] ^= 0xff sig[SignatureSize-1] ^= 0xff if VerifyWithOptions(public, hash[:], sig, &Options{Hash: crypto.SHA512}) == nil { t.Errorf("invalid signature accepted") } // The RFC provides no test vectors for Ed25519ph with context, so just sign // and verify something. sig, err = private.Sign(nil, hash[:], &Options{Hash: crypto.SHA512, Context: "123"}) if err != nil { t.Fatal(err) } if err := VerifyWithOptions(public, hash[:], sig, &Options{Hash: crypto.SHA512, Context: "123"}); err != nil { t.Errorf("valid signature rejected: %v", err) } if err := VerifyWithOptions(public, hash[:], sig, &Options{Hash: crypto.SHA512, Context: "321"}); err == nil { t.Errorf("expected error for wrong context") } if err := VerifyWithOptions(public, hash[:], sig, &Options{Hash: crypto.SHA256, Context: "123"}); err == nil { t.Errorf("expected error for wrong hash") } } func TestSignVerifyContext(t *testing.T) { // From RFC 8032, Section 7.2 key, _ := hex.DecodeString("0305334e381af78f141cb666f6199f57bc3495335a256a95bd2a55bf546663f6dfc9425e4f968f7f0c29f0259cf5f9aed6851c2bb4ad8bfb860cfee0ab248292") expectedSig, _ := hex.DecodeString("55a4cc2f70a54e04288c5f4cd1e45a7bb520b36292911876cada7323198dd87a8b36950b95130022907a7fb7c4e9b2d5f6cca685a587b4b21f4b888e4e7edb0d") message, _ := hex.DecodeString("f726936d19c800494e3fdaff20b276a8") context := "foo" private := PrivateKey(key) public := private.Public().(PublicKey) sig, err := private.Sign(nil, message, &Options{Context: context}) if err != nil { t.Fatal(err) } if !bytes.Equal(sig, expectedSig) { t.Error("signature doesn't match test vector") } if err := VerifyWithOptions(public, message, sig, &Options{Context: context}); err != nil { t.Errorf("valid signature rejected: %v", err) } if VerifyWithOptions(public, []byte("bar"), sig, &Options{Context: context}) == nil { t.Errorf("signature of different message accepted") } if VerifyWithOptions(public, message, sig, &Options{Context: "bar"}) == nil { t.Errorf("signature with different context accepted") } sig[0] ^= 0xff if VerifyWithOptions(public, message, sig, &Options{Context: context}) == nil { t.Errorf("invalid signature accepted") } sig[0] ^= 0xff sig[SignatureSize-1] ^= 0xff if VerifyWithOptions(public, message, sig, &Options{Context: context}) == nil { t.Errorf("invalid signature accepted") } } func TestCryptoSigner(t *testing.T) { var zero zeroReader public, private, _ := GenerateKey(zero) signer := crypto.Signer(private) publicInterface := signer.Public() public2, ok := publicInterface.(PublicKey) if !ok { t.Fatalf("expected PublicKey from Public() but got %T", publicInterface) } if !bytes.Equal(public, public2) { t.Errorf("public keys do not match: original:%x vs Public():%x", public, public2) } message := []byte("message") var noHash crypto.Hash signature, err := signer.Sign(zero, message, noHash) if err != nil { t.Fatalf("error from Sign(): %s", err) } signature2, err := signer.Sign(zero, message, &Options{Hash: noHash}) if err != nil { t.Fatalf("error from Sign(): %s", err) } if !bytes.Equal(signature, signature2) { t.Errorf("signatures keys do not match") } if !Verify(public, message, signature) { t.Errorf("Verify failed on signature from Sign()") } } func TestEqual(t *testing.T) { public, private, _ := GenerateKey(rand.Reader) if !public.Equal(public) { t.Errorf("public key is not equal to itself: %q", public) } if !public.Equal(crypto.Signer(private).Public()) { t.Errorf("private.Public() is not Equal to public: %q", public) } if !private.Equal(private) { t.Errorf("private key is not equal to itself: %q", private) } otherPub, otherPriv, _ := GenerateKey(rand.Reader) if public.Equal(otherPub) { t.Errorf("different public keys are Equal") } if private.Equal(otherPriv) { t.Errorf("different private keys are Equal") } } func TestGolden(t *testing.T) { // sign.input.gz is a selection of test cases from // https://ed25519.cr.yp.to/python/sign.input testDataZ, err := os.Open("testdata/sign.input.gz") if err != nil { t.Fatal(err) } defer testDataZ.Close() testData, err := gzip.NewReader(testDataZ) if err != nil { t.Fatal(err) } defer testData.Close() scanner := bufio.NewScanner(testData) lineNo := 0 for scanner.Scan() { lineNo++ line := scanner.Text() parts := strings.Split(line, ":") if len(parts) != 5 { t.Fatalf("bad number of parts on line %d", lineNo) } privBytes, _ := hex.DecodeString(parts[0]) pubKey, _ := hex.DecodeString(parts[1]) msg, _ := hex.DecodeString(parts[2]) sig, _ := hex.DecodeString(parts[3]) // The signatures in the test vectors also include the message // at the end, but we just want R and S. sig = sig[:SignatureSize] if l := len(pubKey); l != PublicKeySize { t.Fatalf("bad public key length on line %d: got %d bytes", lineNo, l) } var priv [PrivateKeySize]byte copy(priv[:], privBytes) copy(priv[32:], pubKey) sig2 := Sign(priv[:], msg) if !bytes.Equal(sig, sig2[:]) { t.Errorf("different signature result on line %d: %x vs %x", lineNo, sig, sig2) } if !Verify(pubKey, msg, sig2) { t.Errorf("signature failed to verify on line %d", lineNo) } priv2 := NewKeyFromSeed(priv[:32]) if !bytes.Equal(priv[:], priv2) { t.Errorf("recreating key pair gave different private key on line %d: %x vs %x", lineNo, priv[:], priv2) } if pubKey2 := priv2.Public().(PublicKey); !bytes.Equal(pubKey, pubKey2) { t.Errorf("recreating key pair gave different public key on line %d: %x vs %x", lineNo, pubKey, pubKey2) } if seed := priv2.Seed(); !bytes.Equal(priv[:32], seed) { t.Errorf("recreating key pair gave different seed on line %d: %x vs %x", lineNo, priv[:32], seed) } } if err := scanner.Err(); err != nil { t.Fatalf("error reading test data: %s", err) } } func TestMalleability(t *testing.T) { // https://tools.ietf.org/html/rfc8032#section-5.1.7 adds an additional test // that s be in [0, order). This prevents someone from adding a multiple of // order to s and obtaining a second valid signature for the same message. msg := []byte{0x54, 0x65, 0x73, 0x74} sig := []byte{ 0x7c, 0x38, 0xe0, 0x26, 0xf2, 0x9e, 0x14, 0xaa, 0xbd, 0x05, 0x9a, 0x0f, 0x2d, 0xb8, 0xb0, 0xcd, 0x78, 0x30, 0x40, 0x60, 0x9a, 0x8b, 0xe6, 0x84, 0xdb, 0x12, 0xf8, 0x2a, 0x27, 0x77, 0x4a, 0xb0, 0x67, 0x65, 0x4b, 0xce, 0x38, 0x32, 0xc2, 0xd7, 0x6f, 0x8f, 0x6f, 0x5d, 0xaf, 0xc0, 0x8d, 0x93, 0x39, 0xd4, 0xee, 0xf6, 0x76, 0x57, 0x33, 0x36, 0xa5, 0xc5, 0x1e, 0xb6, 0xf9, 0x46, 0xb3, 0x1d, } publicKey := []byte{ 0x7d, 0x4d, 0x0e, 0x7f, 0x61, 0x53, 0xa6, 0x9b, 0x62, 0x42, 0xb5, 0x22, 0xab, 0xbe, 0xe6, 0x85, 0xfd, 0xa4, 0x42, 0x0f, 0x88, 0x34, 0xb1, 0x08, 0xc3, 0xbd, 0xae, 0x36, 0x9e, 0xf5, 0x49, 0xfa, } if Verify(publicKey, msg, sig) { t.Fatal("non-canonical signature accepted") } } func TestAllocations(t *testing.T) { if boring.Enabled { t.Skip("skipping allocations test with BoringCrypto") } testenv.SkipIfOptimizationOff(t) if allocs := testing.AllocsPerRun(100, func() { seed := make([]byte, SeedSize) message := []byte("Hello, world!") priv := NewKeyFromSeed(seed) pub := priv.Public().(PublicKey) signature := Sign(priv, message) if !Verify(pub, message, signature) { t.Fatal("signature didn't verify") } }); allocs > 0 { t.Errorf("expected zero allocations, got %0.1f", allocs) } } func BenchmarkKeyGeneration(b *testing.B) { var zero zeroReader for i := 0; i < b.N; i++ { if _, _, err := GenerateKey(zero); err != nil { b.Fatal(err) } } } func BenchmarkNewKeyFromSeed(b *testing.B) { seed := make([]byte, SeedSize) for i := 0; i < b.N; i++ { _ = NewKeyFromSeed(seed) } } func BenchmarkSigning(b *testing.B) { var zero zeroReader _, priv, err := GenerateKey(zero) if err != nil { b.Fatal(err) } message := []byte("Hello, world!") b.ResetTimer() for i := 0; i < b.N; i++ { Sign(priv, message) } } func BenchmarkVerification(b *testing.B) { var zero zeroReader pub, priv, err := GenerateKey(zero) if err != nil { b.Fatal(err) } message := []byte("Hello, world!") signature := Sign(priv, message) b.ResetTimer() for i := 0; i < b.N; i++ { Verify(pub, message, signature) } }