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package ed25519_test
import (
"bytes"
"crypto"
"crypto/rand"
"errors"
"fmt"
"testing"
"github.com/cloudflare/circl/internal/test"
"github.com/cloudflare/circl/sign/ed25519"
)
func TestWrongPublicKey(t *testing.T) {
wrongPublicKeys := [...][ed25519.PublicKeySize]byte{
{ // y = p
0xed, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f,
},
{ // y > p
0xed + 1, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f,
},
{ // x^2 = u/v = (y^2-1)/(dy^2+1) is not a quadratic residue
0x9a, 0x0a, 0xbe, 0xc6, 0x23, 0xcb, 0x5a, 0x23,
0x4e, 0x49, 0xd8, 0x92, 0xc2, 0x72, 0xd5, 0xa8,
0x27, 0xff, 0x42, 0x07, 0x7d, 0xe3, 0xf2, 0xb4,
0x74, 0x75, 0x9d, 0x04, 0x34, 0xed, 0xa6, 0x70,
},
{ // y = 1 and x^2 = u/v = 0, and the sign of X is 1
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 | 0x80,
},
{ // y = -1 and x^2 = u/v = 0, and the sign of X is 1
0xec, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f | 0x80,
},
}
sig := (&[ed25519.SignatureSize]byte{})[:]
for _, public := range wrongPublicKeys {
got := ed25519.Verify(public[:], []byte(""), sig)
want := false
if got != want {
test.ReportError(t, got, want, public)
}
}
}
func TestSigner(t *testing.T) {
seed := (&[ed25519.SeedSize]byte{})[:]
_, _ = rand.Read(seed)
key := ed25519.NewKeyFromSeed(seed)
priv := key.Seed()
if !bytes.Equal(seed, priv) {
got := priv
want := seed
test.ReportError(t, got, want)
}
for _, o := range []ed25519.SignerOptions{
{Scheme: ed25519.ED25519, Hash: crypto.Hash(0), Context: ""},
{Scheme: ed25519.ED25519Ph, Hash: crypto.SHA512, Context: ""},
{Scheme: ed25519.ED25519Ph, Hash: crypto.SHA512, Context: "non-empty"},
{Scheme: ed25519.ED25519Ctx, Hash: crypto.Hash(0), Context: "non-empty"},
} {
testSigner(t, key, o)
}
}
func testSigner(t *testing.T, signer crypto.Signer, ops ed25519.SignerOptions) {
msg := make([]byte, 64)
_, _ = rand.Read(msg)
sig, err := signer.Sign(nil, msg, ops)
if err != nil {
got := err
var want error
test.ReportError(t, got, want, ops)
}
if len(sig) != ed25519.SignatureSize {
got := len(sig)
want := ed25519.SignatureSize
test.ReportError(t, got, want, ops)
}
pubSigner, ok := signer.Public().(ed25519.PublicKey)
if !ok {
got := ok
want := true
test.ReportError(t, got, want, ops)
}
got := ed25519.VerifyAny(pubSigner, msg, sig, ops)
want := true
if got != want {
test.ReportError(t, got, want, ops)
}
}
type badReader struct{}
func (badReader) Read([]byte) (int, error) { return 0, errors.New("cannot read") }
func TestErrors(t *testing.T) {
t.Run("badHash", func(t *testing.T) {
var msg [16]byte
ops := crypto.SHA224
_, priv, _ := ed25519.GenerateKey(nil)
_, got := priv.Sign(nil, msg[:], ops)
want := errors.New("ed25519: bad hash algorithm")
if got.Error() != want.Error() {
test.ReportError(t, got, want)
}
})
t.Run("badReader", func(t *testing.T) {
_, _, got := ed25519.GenerateKey(badReader{})
want := errors.New("cannot read")
if got.Error() != want.Error() {
test.ReportError(t, got, want)
}
})
t.Run("wrongSeedSize", func(t *testing.T) {
var seed [256]byte
var want error
got := test.CheckPanic(func() { ed25519.NewKeyFromSeed(seed[:]) })
if got != want {
test.ReportError(t, got, want)
}
})
}
func BenchmarkEd25519Ph(b *testing.B) {
msg := make([]byte, 128)
_, _ = rand.Read(msg)
b.Run("Sign", func(b *testing.B) {
_, key, _ := ed25519.GenerateKey(rand.Reader)
ctx := ""
b.ResetTimer()
for i := 0; i < b.N; i++ {
_ = ed25519.SignPh(key, msg, ctx)
}
})
b.Run("Verify", func(b *testing.B) {
pub, priv, _ := ed25519.GenerateKey(rand.Reader)
ctx := ""
sig := ed25519.SignPh(priv, msg, ctx)
b.ResetTimer()
for i := 0; i < b.N; i++ {
ed25519.VerifyPh(pub, msg, sig, ctx)
}
})
}
func BenchmarkEd25519Ctx(b *testing.B) {
ctx := "a context"
msg := make([]byte, 128)
_, _ = rand.Read(msg)
b.Run("Sign", func(b *testing.B) {
_, priv, _ := ed25519.GenerateKey(rand.Reader)
b.ResetTimer()
for i := 0; i < b.N; i++ {
_ = ed25519.SignWithCtx(priv, msg, ctx)
}
})
b.Run("Verify", func(b *testing.B) {
pub, priv, _ := ed25519.GenerateKey(rand.Reader)
sig := ed25519.SignWithCtx(priv, msg, ctx)
b.ResetTimer()
for i := 0; i < b.N; i++ {
ed25519.VerifyWithCtx(pub, msg, sig, ctx)
}
})
}
func Example_ed25519() {
// import "github.com/cloudflare/circl/sign/ed25519"
// import "crypto/rand"
// Generating Alice's key pair
pub, priv, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
panic("error on generating keys")
}
// Alice signs a message.
message := []byte("A message to be signed")
signature := ed25519.Sign(priv, message)
// Anyone can verify the signature using Alice's public key.
ok := ed25519.Verify(pub, message, signature)
fmt.Println(ok)
// Output: true
}
func ExampleSignPh() {
// import "github.com/cloudflare/circl/sign/ed25519"
// import "crypto/rand"
// Generating Alice's key pair
pub, priv, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
panic("error on generating keys")
}
// Alice signs a message.
message := []byte("A message to be signed")
ctx := "an optional context string"
signature := ed25519.SignPh(priv, message, ctx)
// Anyone can verify the signature using Alice's public key.
ok := ed25519.VerifyPh(pub, message, signature, ctx)
fmt.Println(ok)
// Output: true
}
func ExampleSignWithCtx() {
// import "github.com/cloudflare/circl/sign/ed25519"
// import "crypto/rand"
// Generating Alice's key pair
pub, priv, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
panic("error on generating keys")
}
// Alice signs a message.
message := []byte("A message to be signed")
ctx := "a non-empty context string"
signature := ed25519.SignWithCtx(priv, message, ctx)
// Anyone can verify the signature using Alice's public key.
ok := ed25519.VerifyWithCtx(pub, message, signature, ctx)
fmt.Println(ok)
// Output: true
}
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