mirror of
https://github.com/henrydcase/nobs.git
synced 2024-11-26 09:01:20 +00:00
335 lines
9.2 KiB
Go
335 lines
9.2 KiB
Go
package sike
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import (
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"testing"
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"bufio"
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"bytes"
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"encoding/hex"
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"io"
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"os"
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"strings"
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rand "crypto/rand"
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. "github.com/henrydcase/nobs/dh/sidh"
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)
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const (
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Pk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PrB = "00010203040506070809000102030405060708090001020304050607080901028626ED79D451140800E03B59B956F8210E556067407D13DC90FA9E8B872BFB8FAB0A7289852106E40538D3575C500201"
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KAT644 = "../../etc/PQCkemKAT_644.rsp"
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)
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var params = Params(FP_751)
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// Fail if err !=nil. Display msg as an error message
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func checkErr(t testing.TB, err error, msg string) {
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if err != nil {
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t.Error(msg)
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}
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}
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// Encrypt, Decrypt, check if input/output plaintext is the same
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func TestPKERoundTrip(t *testing.T) {
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// Message to be encrypted
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var msg [32]byte
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for i, _ := range msg {
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msg[i] = byte(i)
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}
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// Import keys
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pkB := NewPublicKey(params.Id, KeyVariant_SIKE)
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skB := NewPrivateKey(params.Id, KeyVariant_SIKE)
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pk_hex, err := hex.DecodeString(PkB)
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if err != nil {
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t.Fatal(err)
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}
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sk_hex, err := hex.DecodeString(PrB)
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if err != nil {
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t.Fatal(err)
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}
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if pkB.Import(pk_hex) != nil || skB.Import(sk_hex) != nil {
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t.Error("Import")
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}
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ct, err := Encrypt(rand.Reader, pkB, msg[:])
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if err != nil {
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t.Fatal(err)
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}
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pt, err := Decrypt(skB, ct)
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(pt[:], msg[:]) {
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t.Errorf("Decryption failed \n got : %X\n exp : %X", pt, msg)
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}
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}
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// Generate key and check if can encrypt
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func TestPKEKeyGeneration(t *testing.T) {
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// Message to be encrypted
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var msg [32]byte
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var err error
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for i, _ := range msg {
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msg[i] = byte(i)
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}
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sk := NewPrivateKey(params.Id, KeyVariant_SIKE)
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err = sk.Generate(rand.Reader)
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checkErr(t, err, "PEK key generation")
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pk, _ := GeneratePublicKey(sk)
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// Try to encrypt
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ct, err := Encrypt(rand.Reader, pk, msg[:])
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checkErr(t, err, "PEK encryption")
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pt, err := Decrypt(sk, ct)
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checkErr(t, err, "PEK key decryption")
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if !bytes.Equal(pt[:], msg[:]) {
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t.Fatalf("Decryption failed \n got : %X\n exp : %X", pt, msg)
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}
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}
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func TestNegativePKE(t *testing.T) {
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var msg [40]byte
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var err error
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// Generate key
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sk := NewPrivateKey(params.Id, KeyVariant_SIKE)
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err = sk.Generate(rand.Reader)
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checkErr(t, err, "key generation")
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pk, _ := GeneratePublicKey(sk)
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ct, err := Encrypt(rand.Reader, pk, msg[:39])
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if err == nil {
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t.Fatal("Error hasn't been returned")
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}
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if ct != nil {
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t.Fatal("Ciphertext must be nil")
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}
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pt, err := Decrypt(sk, msg[:23])
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if err == nil {
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t.Fatal("Error hasn't been returned")
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}
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if pt != nil {
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t.Fatal("Ciphertext must be nil")
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}
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}
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func testKEMRoundTrip(pkB, skB []byte) bool {
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// Import keys
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pk := NewPublicKey(params.Id, KeyVariant_SIKE)
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sk := NewPrivateKey(params.Id, KeyVariant_SIKE)
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if pk.Import(pkB) != nil || sk.Import(skB) != nil {
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return false
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}
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ct, ss_e, err := Encapsulate(rand.Reader, pk)
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if err != nil {
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return false
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}
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ss_d, err := Decapsulate(sk, pk, ct)
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if err != nil {
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return false
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}
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return bytes.Equal(ss_e, ss_d)
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}
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func TestKEMRoundTrip(t *testing.T) {
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pk, err := hex.DecodeString(PkB)
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checkErr(t, err, "public key B not a number")
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sk, err := hex.DecodeString(PrB)
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checkErr(t, err, "private key B not a number")
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if !testKEMRoundTrip(pk, sk) {
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t.Error("kem roundtrip failed")
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}
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}
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func TestKEMKeyGeneration(t *testing.T) {
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// Generate key
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sk := NewPrivateKey(params.Id, KeyVariant_SIKE)
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checkErr(t, sk.Generate(rand.Reader), "error: key generation")
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pk, _ := GeneratePublicKey(sk)
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// calculated shared secret
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ct, ss_e, err := Encapsulate(rand.Reader, pk)
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checkErr(t, err, "encapsulation failed")
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ss_d, err := Decapsulate(sk, pk, ct)
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checkErr(t, err, "decapsulation failed")
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if !bytes.Equal(ss_e, ss_d) {
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t.Fatalf("KEM failed \n encapsulated: %X\n decapsulated: %X", ss_d, ss_e)
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}
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}
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func TestNegativeKEM(t *testing.T) {
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sk := NewPrivateKey(params.Id, KeyVariant_SIKE)
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checkErr(t, sk.Generate(rand.Reader), "error: key generation")
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pk, _ := GeneratePublicKey(sk)
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ct, ss_e, err := Encapsulate(rand.Reader, pk)
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checkErr(t, err, "pre-requisite for a test failed")
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ct[0] ^= ct[0]
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ss_d, err := Decapsulate(sk, pk, ct)
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checkErr(t, err, "decapsulation returns error when invalid ciphertext provided")
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if bytes.Equal(ss_e, ss_d) {
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// no idea how this could ever happen, but it would be very bad
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t.Error("critical error")
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}
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// Try encapsulating with SIDH key
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pkSidh := NewPublicKey(params.Id, KeyVariant_SIDH_B)
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prSidh := NewPrivateKey(params.Id, KeyVariant_SIDH_B)
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_, _, err = Encapsulate(rand.Reader, pkSidh)
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if err == nil {
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t.Error("encapsulation accepts SIDH public key")
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}
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// Try decapsulating with SIDH key
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_, err = Decapsulate(prSidh, pk, ct)
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if err == nil {
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t.Error("decapsulation accepts SIDH private key key")
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}
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}
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// In case invalid ciphertext is provided, SIKE's decapsulation must
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// return same (but unpredictable) result for a given key.
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func TestNegativeKEMSameWrongResult(t *testing.T) {
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sk := NewPrivateKey(params.Id, KeyVariant_SIKE)
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checkErr(t, sk.Generate(rand.Reader), "error: key generation")
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pk, _ := GeneratePublicKey(sk)
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ct, encSs, err := Encapsulate(rand.Reader, pk)
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checkErr(t, err, "pre-requisite for a test failed")
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// make ciphertext wrong
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ct[0] ^= ct[0]
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decSs1, err := Decapsulate(sk, pk, ct)
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checkErr(t, err, "pre-requisite for a test failed")
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// second decapsulation must be done with same, but imported private key
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expSk := sk.Export()
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// creat new private key
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sk = NewPrivateKey(params.Id, KeyVariant_SIKE)
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err = sk.Import(expSk)
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checkErr(t, err, "import failed")
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// try decapsulating again. ss2 must be same as ss1 and different than
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// original plaintext
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decSs2, err := Decapsulate(sk, pk, ct)
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checkErr(t, err, "pre-requisite for a test failed")
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if !bytes.Equal(decSs1, decSs2) {
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t.Error("decapsulation is insecure")
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}
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if bytes.Equal(encSs, decSs1) || bytes.Equal(encSs, decSs2) {
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// this test requires that decapsulation returns wrong result
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t.Errorf("test implementation error")
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}
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}
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func readAndCheckLine(r *bufio.Reader) []byte {
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// Read next line from buffer
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line, isPrefix, err := r.ReadLine()
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if err != nil || isPrefix {
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panic("Wrong format of input file")
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}
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// Function expects that line is in format "KEY = HEX_VALUE". Get
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// value, which should be a hex string
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hexst := strings.Split(string(line), "=")[1]
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hexst = strings.TrimSpace(hexst)
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// Convert value to byte string
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ret, err := hex.DecodeString(hexst)
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if err != nil {
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panic("Wrong format of input file")
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}
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return ret
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}
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func testKeygen(pk, sk []byte) bool {
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// Import provided private key
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var prvKey = NewPrivateKey(params.Id, KeyVariant_SIKE)
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if prvKey.Import(sk) != nil {
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panic("sike test: can't load KAT")
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}
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// Generate public key
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pubKey, _ := GeneratePublicKey(prvKey)
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return bytes.Equal(pubKey.Export(), pk)
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}
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func testDecapsulation(pk, sk, ct, ssExpected []byte) bool {
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var pubKey = NewPublicKey(params.Id, KeyVariant_SIKE)
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var prvKey = NewPrivateKey(params.Id, KeyVariant_SIKE)
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if pubKey.Import(pk) != nil || prvKey.Import(sk) != nil {
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panic("sike test: can't load KAT")
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}
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ssGot, err := Decapsulate(prvKey, pubKey, ct)
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if err != nil {
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panic("sike test: can't perform decapsulation KAT")
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}
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if err != nil {
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return false
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}
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return bytes.Equal(ssGot, ssExpected)
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}
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func TestSIKE_KAT(t *testing.T) {
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f, err := os.Open(KAT644)
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if err != nil {
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t.Fatal(err)
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}
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r := bufio.NewReader(f)
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for {
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line, isPrefix, err := r.ReadLine()
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if err != nil || isPrefix {
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if err == io.EOF {
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break
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} else {
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t.Fatal(err)
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}
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}
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if len(strings.TrimSpace(string(line))) == 0 || line[0] == '#' {
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continue
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}
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// count
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count := strings.Split(string(line), "=")[1]
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// seed
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_ = readAndCheckLine(r)
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// pk
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pk := readAndCheckLine(r)
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// sk (secret key in test vector is concatenation of
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// MSG + SECRET_BOB_KEY + PUBLIC_BOB_KEY. We use only MSG+SECRET_BOB_KEY
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sk := readAndCheckLine(r)
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sk = sk[:params.MsgLen+uint(params.SecretKeySize)]
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// ct
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ct := readAndCheckLine(r)
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// ss
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ss := readAndCheckLine(r)
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if !testKeygen(pk, sk) {
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t.Fatalf("KAT keygen form private failed at %s\n", count)
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}
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if !testDecapsulation(pk, sk, ct, ss) {
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t.Fatalf("KAT decapsulation failed at %s\n", count)
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}
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// aditionally test roundtrip with a keypair
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if !testKEMRoundTrip(pk, sk) {
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t.Fatalf("KAT roundtrip failed at %s\n", count)
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}
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}
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}
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