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-rw-r--r--pkg/types/crypto.go30
-rw-r--r--pkg/types/crypto_test.go64
-rw-r--r--pkg/types/endpoint.go22
-rw-r--r--pkg/types/leaf.go111
-rw-r--r--pkg/types/leaf_test.go299
-rw-r--r--pkg/types/proof.go46
-rw-r--r--pkg/types/proof_test.go138
-rw-r--r--pkg/types/tree_head.go76
-rw-r--r--pkg/types/tree_head_test.go253
9 files changed, 1039 insertions, 0 deletions
diff --git a/pkg/types/crypto.go b/pkg/types/crypto.go
new file mode 100644
index 0000000..72152bf
--- /dev/null
+++ b/pkg/types/crypto.go
@@ -0,0 +1,30 @@
+package types
+
+import (
+ "crypto/ed25519"
+ "crypto/sha256"
+)
+
+const (
+ HashSize = sha256.Size
+ SignatureSize = ed25519.SignatureSize
+ PublicKeySize = ed25519.PublicKeySize
+
+ InteriorNodePrefix = byte(0x00)
+ LeafNodePrefix = byte(0x01)
+)
+
+type (
+ Hash [HashSize]byte
+ Signature [SignatureSize]byte
+ PublicKey [PublicKeySize]byte
+)
+
+func HashFn(buf []byte) *Hash {
+ var hash Hash = sha256.Sum256(buf)
+ return &hash
+}
+
+func LeafHash(buf []byte) *Hash {
+ return HashFn(append([]byte{LeafNodePrefix}, buf...))
+}
diff --git a/pkg/types/crypto_test.go b/pkg/types/crypto_test.go
new file mode 100644
index 0000000..d95d5fa
--- /dev/null
+++ b/pkg/types/crypto_test.go
@@ -0,0 +1,64 @@
+package types
+
+import (
+ "crypto"
+ "crypto/ed25519"
+ "crypto/rand"
+ "io"
+ "testing"
+)
+
+type testSigner struct {
+ PublicKey PublicKey
+ Signature Signature
+ Error error
+}
+
+func (ts *testSigner) Public() crypto.PublicKey {
+ return ed25519.PublicKey(ts.PublicKey[:])
+}
+
+func (ts *testSigner) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
+ return ts.Signature[:], ts.Error
+}
+
+func newKeyPair(t *testing.T) (crypto.Signer, PublicKey) {
+ vk, sk, err := ed25519.GenerateKey(rand.Reader)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ var pub PublicKey
+ copy(pub[:], vk[:])
+ return sk, pub
+}
+
+func newHashBufferInc(t *testing.T) *Hash {
+ t.Helper()
+
+ var buf Hash
+ for i := 0; i < len(buf); i++ {
+ buf[i] = byte(i)
+ }
+ return &buf
+}
+
+func newSigBufferInc(t *testing.T) *Signature {
+ t.Helper()
+
+ var buf Signature
+ for i := 0; i < len(buf); i++ {
+ buf[i] = byte(i)
+ }
+ return &buf
+}
+
+func newPubBufferInc(t *testing.T) *PublicKey {
+ t.Helper()
+
+ var buf PublicKey
+ for i := 0; i < len(buf); i++ {
+ buf[i] = byte(i)
+ }
+ return &buf
+}
diff --git a/pkg/types/endpoint.go b/pkg/types/endpoint.go
new file mode 100644
index 0000000..0e4bab2
--- /dev/null
+++ b/pkg/types/endpoint.go
@@ -0,0 +1,22 @@
+package types
+
+import "strings"
+
+type Endpoint string
+
+const (
+ EndpointAddLeaf = Endpoint("add-leaf")
+ EndpointAddCosignature = Endpoint("add-cosignature")
+ EndpointGetTreeHeadLatest = Endpoint("get-tree-head-latest")
+ EndpointGetTreeHeadToSign = Endpoint("get-tree-head-to-sign")
+ EndpointGetTreeHeadCosigned = Endpoint("get-tree-head-cosigned")
+ EndpointGetInclusionProof = Endpoint("get-inclusion-proof")
+ EndpointGetConsistencyProof = Endpoint("get-consistency-proof")
+ EndpointGetLeaves = Endpoint("get-leaves")
+)
+
+// Path joins a number of components to form a full endpoint path. For example,
+// EndpointAddLeaf.Path("example.com", "sigsum/v0") -> example.com/sigsum/v0/add-leaf.
+func (e Endpoint) Path(components ...string) string {
+ return strings.Join(append(components, string(e)), "/")
+}
diff --git a/pkg/types/leaf.go b/pkg/types/leaf.go
new file mode 100644
index 0000000..1476ead
--- /dev/null
+++ b/pkg/types/leaf.go
@@ -0,0 +1,111 @@
+package types
+
+import (
+ "crypto"
+ "crypto/ed25519"
+ "encoding/binary"
+ "fmt"
+ "io"
+
+ "git.sigsum.org/sigsum-lib-go/pkg/ascii"
+)
+
+type Statement struct {
+ ShardHint uint64 `ascii:"shard_hint"`
+ Checksum Hash `ascii:"checksum"`
+}
+
+type Leaf struct {
+ Statement
+ Signature Signature `ascii:"signature"`
+ KeyHash Hash `ascii:"key_hash"`
+}
+
+type Leaves []Leaf
+
+func (s *Statement) ToBinary() []byte {
+ b := make([]byte, 40)
+ binary.BigEndian.PutUint64(b[0:8], s.ShardHint)
+ copy(b[8:40], s.Checksum[:])
+ return b
+}
+
+func (s *Statement) Sign(signer crypto.Signer) (*Signature, error) {
+ sig, err := signer.Sign(nil, s.ToBinary(), crypto.Hash(0))
+ if err != nil {
+ return nil, fmt.Errorf("types: failed signing statement")
+ }
+
+ var signature Signature
+ copy(signature[:], sig)
+ return &signature, nil
+}
+
+func (s *Statement) Verify(key *PublicKey, sig *Signature) bool {
+ return ed25519.Verify(ed25519.PublicKey(key[:]), s.ToBinary(), sig[:])
+}
+
+func (l *Leaf) ToBinary() []byte {
+ b := make([]byte, 136)
+ binary.BigEndian.PutUint64(b[0:8], l.ShardHint)
+ copy(b[8:40], l.Checksum[:])
+ copy(b[40:104], l.Signature[:])
+ copy(b[104:136], l.KeyHash[:])
+ return b
+}
+
+func (l *Leaf) FromBinary(b []byte) error {
+ if len(b) != 136 {
+ return fmt.Errorf("types: invalid leaf size: %d", len(b))
+ }
+
+ l.ShardHint = binary.BigEndian.Uint64(b[0:8])
+ copy(l.Checksum[:], b[8:40])
+ copy(l.Signature[:], b[40:104])
+ copy(l.KeyHash[:], b[104:136])
+ return nil
+}
+
+func (l *Leaf) ToASCII(w io.Writer) error {
+ return ascii.StdEncoding.Serialize(w, l)
+}
+
+func (l *Leaf) FromASCII(r io.Reader) error {
+ return ascii.StdEncoding.Deserialize(r, l)
+}
+
+func (l *Leaves) FromASCII(r io.Reader) error {
+ leaves := &struct {
+ ShardHint []uint64 `ascii:"shard_hint"`
+ Checksum []Hash `ascii:"checksum"`
+ Signature []Signature `ascii:"signature"`
+ KeyHash []Hash `ascii:"key_hash"`
+ }{}
+
+ if err := ascii.StdEncoding.Deserialize(r, leaves); err != nil {
+ return err
+ }
+ n := len(leaves.ShardHint)
+ if n != len(leaves.Checksum) {
+ return fmt.Errorf("types: mismatched leaf field counts")
+ }
+ if n != len(leaves.Signature) {
+ return fmt.Errorf("types: mismatched leaf field counts")
+ }
+ if n != len(leaves.KeyHash) {
+ return fmt.Errorf("types: mismatched leaf field counts")
+ }
+
+ *l = make([]Leaf, 0, n)
+ for i := 0; i < n; i++ {
+ *l = append(*l, Leaf{
+ Statement: Statement{
+ ShardHint: leaves.ShardHint[i],
+ Checksum: leaves.Checksum[i],
+ },
+ Signature: leaves.Signature[i],
+ KeyHash: leaves.KeyHash[i],
+ })
+ }
+ return nil
+}
diff --git a/pkg/types/leaf_test.go b/pkg/types/leaf_test.go
new file mode 100644
index 0000000..0ae6431
--- /dev/null
+++ b/pkg/types/leaf_test.go
@@ -0,0 +1,299 @@
+package types
+
+import (
+ "bytes"
+ "crypto"
+ "fmt"
+ "io"
+ "reflect"
+ "strings"
+ "testing"
+)
+
+func TestStatementToBinary(t *testing.T) {
+ desc := "valid: shard hint 72623859790382856, checksum 0x00,0x01,..."
+ if got, want := validStatement(t).ToBinary(), validStatementBytes(t); !bytes.Equal(got, want) {
+ t.Errorf("got statement\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, desc)
+ }
+}
+
+func TestStatementSign(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ stm *Statement
+ signer crypto.Signer
+ wantSig *Signature
+ wantErr bool
+ }{
+ {
+ desc: "invalid: signer error",
+ stm: validStatement(t),
+ signer: &testSigner{*newPubBufferInc(t), *newSigBufferInc(t), fmt.Errorf("signing error")},
+ wantErr: true,
+ },
+ {
+ desc: "valid",
+ stm: validStatement(t),
+ signer: &testSigner{*newPubBufferInc(t), *newSigBufferInc(t), nil},
+ wantSig: newSigBufferInc(t),
+ },
+ } {
+ sig, err := table.stm.Sign(table.signer)
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+
+ if got, want := sig[:], table.wantSig[:]; !bytes.Equal(got, want) {
+ t.Errorf("got signature\n\t%v\nbut wanted\n\t%v\nin test %q", got, want, table.desc)
+ }
+ }
+}
+
+func TestStatementVerify(t *testing.T) {
+ stm := validStatement(t)
+ signer, pub := newKeyPair(t)
+
+ sig, err := stm.Sign(signer)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ if !stm.Verify(&pub, sig) {
+ t.Errorf("failed verifying a valid statement")
+ }
+
+ stm.ShardHint += 1
+ if stm.Verify(&pub, sig) {
+ t.Errorf("succeeded verifying an invalid statement")
+ }
+}
+
+func TestLeafToBinary(t *testing.T) {
+ desc := "valid: shard hint 72623859790382856, buffers 0x00,0x01,..."
+ if got, want := validLeaf(t).ToBinary(), validLeafBytes(t); !bytes.Equal(got, want) {
+ t.Errorf("got leaf\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, desc)
+ }
+}
+
+func TestLeafFromBinary(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ serialized []byte
+ wantErr bool
+ want *Leaf
+ }{
+ {
+ desc: "invalid: not enough bytes",
+ serialized: make([]byte, 135),
+ wantErr: true,
+ },
+ {
+ desc: "invalid: too many bytes",
+ serialized: make([]byte, 137),
+ wantErr: true,
+ },
+ {
+ desc: "valid: shard hint 72623859790382856, buffers 0x00,0x01,...",
+ serialized: validLeafBytes(t),
+ want: validLeaf(t),
+ },
+ } {
+ var leaf Leaf
+ err := leaf.FromBinary(table.serialized)
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+ if got, want := &leaf, table.want; !reflect.DeepEqual(got, want) {
+ t.Errorf("got leaf\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, table.desc)
+ }
+ }
+}
+
+func TestLeafToASCII(t *testing.T) {
+ desc := "valid: shard hint 72623859790382856, buffers 0x00,0x01,..."
+ buf := bytes.NewBuffer(nil)
+ if err := validLeaf(t).ToASCII(buf); err != nil {
+ t.Fatalf("got error true but wanted false in test %q: %v", desc, err)
+ }
+ if got, want := string(buf.Bytes()), validLeafASCII(t); got != want {
+ t.Errorf("got leaf\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, desc)
+ }
+}
+
+func TestLeafFromASCII(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ serialized io.Reader
+ wantErr bool
+ want *Leaf
+ }{
+ {
+ desc: "invalid: not a tree leaf (too few key-value pairs)",
+ serialized: bytes.NewBuffer([]byte("shard_hint=0\n")),
+ wantErr: true,
+ },
+ {
+ desc: "invalid: not a tree leaf (too many key-value pairs)",
+ serialized: bytes.NewBuffer(append(validLeafBytes(t)[:], []byte("key=value\n")...)),
+ wantErr: true,
+ },
+ {
+ desc: "valid: shard hint 72623859790382856, buffers 0x00,0x01,...",
+ serialized: bytes.NewBuffer([]byte(validLeafASCII(t))),
+ want: validLeaf(t),
+ },
+ } {
+ var leaf Leaf
+ err := leaf.FromASCII(table.serialized)
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+ if got, want := &leaf, table.want; !reflect.DeepEqual(got, want) {
+ t.Errorf("got leaf\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, table.desc)
+ }
+ }
+}
+
+func TestLeavesFromASCII(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ serialized io.Reader
+ wantErr bool
+ want *Leaves
+ }{
+ {
+ desc: "invalid: not a list of tree leaves (too few key-value pairs)",
+ serialized: bytes.NewBuffer([]byte("shard_hint=0\n")),
+ wantErr: true,
+ },
+ {
+ desc: "invalid: not a list of tree leaves (too many key-value pairs)",
+ serialized: bytes.NewBuffer(append(validLeafBytes(t)[:], []byte("key=value\n")...)),
+ wantErr: true,
+ },
+ {
+ desc: "invalid: not a list of tree leaves (too few shard hints))",
+ serialized: bytes.NewBuffer([]byte(invalidLeavesASCII(t, "shard_hint"))),
+ wantErr: true,
+ },
+ {
+ desc: "invalid: not a list of tree leaves (too few checksums))",
+ serialized: bytes.NewBuffer([]byte(invalidLeavesASCII(t, "checksum"))),
+ wantErr: true,
+ },
+ {
+ desc: "invalid: not a list of tree leaves (too few signatures))",
+ serialized: bytes.NewBuffer([]byte(invalidLeavesASCII(t, "signature"))),
+ wantErr: true,
+ },
+ {
+ desc: "invalid: not a list of tree leaves (too few key hashes))",
+ serialized: bytes.NewBuffer([]byte(invalidLeavesASCII(t, "key_hash"))),
+ wantErr: true,
+ },
+ {
+ desc: "valid leaves",
+ serialized: bytes.NewBuffer([]byte(validLeavesASCII(t))),
+ want: validLeaves(t),
+ },
+ } {
+ var leaves Leaves
+ err := leaves.FromASCII(table.serialized)
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+ if got, want := &leaves, table.want; !reflect.DeepEqual(got, want) {
+ t.Errorf("got leaves\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, table.desc)
+ }
+ }
+}
+
+func validStatement(t *testing.T) *Statement {
+ return &Statement{
+ ShardHint: 72623859790382856,
+ Checksum: *newHashBufferInc(t),
+ }
+}
+
+func validStatementBytes(t *testing.T) []byte {
+ return bytes.Join([][]byte{
+ []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08},
+ newHashBufferInc(t)[:],
+ }, nil)
+}
+
+func validLeaf(t *testing.T) *Leaf {
+ return &Leaf{
+ Statement: Statement{
+ ShardHint: 72623859790382856,
+ Checksum: *newHashBufferInc(t),
+ },
+ Signature: *newSigBufferInc(t),
+ KeyHash: *newHashBufferInc(t),
+ }
+}
+
+func validLeafBytes(t *testing.T) []byte {
+ return bytes.Join([][]byte{
+ []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08},
+ newHashBufferInc(t)[:],
+ newSigBufferInc(t)[:],
+ newHashBufferInc(t)[:],
+ }, nil)
+}
+
+func validLeafASCII(t *testing.T) string {
+ return fmt.Sprintf("%s=%d\n%s=%x\n%s=%x\n%s=%x\n",
+ "shard_hint", 72623859790382856,
+ "checksum", newHashBufferInc(t)[:],
+ "signature", newSigBufferInc(t)[:],
+ "key_hash", newHashBufferInc(t)[:],
+ )
+}
+
+func validLeaves(t *testing.T) *Leaves {
+ t.Helper()
+ return &Leaves{*validLeaf(t), Leaf{}}
+}
+
+func validLeavesASCII(t *testing.T) string {
+ t.Helper()
+ return validLeafASCII(t) + fmt.Sprintf("%s=%d\n%s=%x\n%s=%x\n%s=%x\n",
+ "shard_hint", 0,
+ "checksum", Hash{},
+ "signature", Signature{},
+ "key_hash", Hash{},
+ )
+}
+
+func invalidLeavesASCII(t *testing.T, key string) string {
+ buf := validLeavesASCII(t)
+ lines := strings.Split(buf, "\n")
+
+ var ret string
+ switch key {
+ case "shard_hint":
+ ret = strings.Join(lines[1:], "\n")
+ case "checksum":
+ ret = strings.Join(append(lines[:1], lines[2:]...), "\n")
+ case "signature":
+ ret = strings.Join(append(lines[0:2], lines[3:]...), "\n")
+ case "key_hash":
+ ret = strings.Join(append(lines[0:3], lines[4:]...), "\n")
+ default:
+ t.Fatalf("must have a valid key to remove")
+ }
+ return ret
+}
diff --git a/pkg/types/proof.go b/pkg/types/proof.go
new file mode 100644
index 0000000..4311357
--- /dev/null
+++ b/pkg/types/proof.go
@@ -0,0 +1,46 @@
+package types
+
+import (
+ "io"
+
+ "git.sigsum.org/sigsum-lib-go/pkg/ascii"
+)
+
+type InclusionProof struct {
+ TreeSize uint64
+ LeafIndex uint64 `ascii:"leaf_index"`
+ Path []Hash `ascii:"inclusion_path"`
+}
+
+type ConsistencyProof struct {
+ NewSize uint64
+ OldSize uint64
+ Path []Hash `ascii:"consistency_path"`
+}
+
+func (p *InclusionProof) ToASCII(w io.Writer) error {
+ return ascii.StdEncoding.Serialize(w, p)
+}
+
+func (p *InclusionProof) FromASCII(r io.Reader, treeSize uint64) error {
+ p.TreeSize = treeSize
+ return ascii.StdEncoding.Deserialize(r, p)
+}
+
+func (p *InclusionProof) Verify(treeSize uint64) bool {
+ return false // TODO: verify inclusion proof
+}
+
+func (p *ConsistencyProof) ToASCII(w io.Writer) error {
+ return ascii.StdEncoding.Serialize(w, p)
+}
+
+func (p *ConsistencyProof) FromASCII(r io.Reader, oldSize, newSize uint64) error {
+ p.OldSize = oldSize
+ p.NewSize = newSize
+ return ascii.StdEncoding.Deserialize(r, p)
+}
+
+func (p *ConsistencyProof) Verify(newRoot, oldRoot *Hash) bool {
+ return false // TODO: verify consistency proof
+}
diff --git a/pkg/types/proof_test.go b/pkg/types/proof_test.go
new file mode 100644
index 0000000..8285b6e
--- /dev/null
+++ b/pkg/types/proof_test.go
@@ -0,0 +1,138 @@
+package types
+
+import (
+ "bytes"
+ "fmt"
+ "io"
+ "reflect"
+ "testing"
+)
+
+func TestInclusionProofToASCII(t *testing.T) {
+ desc := "valid"
+ buf := bytes.NewBuffer(nil)
+ if err := validInclusionProof(t).ToASCII(buf); err != nil {
+ t.Fatalf("got error true but wanted false in test %q: %v", desc, err)
+ }
+ if got, want := string(buf.Bytes()), validInclusionProofASCII(t); got != want {
+ t.Errorf("got inclusion proof\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, desc)
+ }
+}
+
+func TestInclusionProofFromASCII(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ serialized io.Reader
+ wantErr bool
+ want *InclusionProof
+ }{
+ {
+ desc: "invalid: not an inclusion proof (unexpected key-value pair)",
+ serialized: bytes.NewBuffer(append([]byte(validInclusionProofASCII(t)), []byte("tree_size=4")...)),
+ wantErr: true,
+ want: validInclusionProof(t), // to populate input to FromASCII
+ },
+ {
+ desc: "valid",
+ serialized: bytes.NewBuffer([]byte(validInclusionProofASCII(t))),
+ want: validInclusionProof(t),
+ },
+ } {
+ var proof InclusionProof
+ err := proof.FromASCII(table.serialized, table.want.TreeSize)
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+ if got, want := &proof, table.want; !reflect.DeepEqual(got, want) {
+ t.Errorf("got inclusion proof\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, table.desc)
+ }
+ }
+}
+
+func TestConsistencyProofToASCII(t *testing.T) {
+ desc := "valid"
+ buf := bytes.NewBuffer(nil)
+ if err := validConsistencyProof(t).ToASCII(buf); err != nil {
+ t.Fatalf("got error true but wanted false in test %q: %v", desc, err)
+ }
+ if got, want := string(buf.Bytes()), validConsistencyProofASCII(t); got != want {
+ t.Errorf("got consistency proof\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, desc)
+ }
+}
+
+func TestConsistencyProofFromASCII(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ serialized io.Reader
+ wantErr bool
+ want *ConsistencyProof
+ }{
+ {
+ desc: "invalid: not a consistency proof (unexpected key-value pair)",
+ serialized: bytes.NewBuffer(append([]byte(validConsistencyProofASCII(t)), []byte("start_size=1")...)),
+ wantErr: true,
+ want: validConsistencyProof(t), // to populate input to FromASCII
+ },
+ {
+ desc: "valid",
+ serialized: bytes.NewBuffer([]byte(validConsistencyProofASCII(t))),
+ want: validConsistencyProof(t),
+ },
+ } {
+ var proof ConsistencyProof
+ err := proof.FromASCII(table.serialized, table.want.OldSize, table.want.NewSize)
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+ if got, want := &proof, table.want; !reflect.DeepEqual(got, want) {
+ t.Errorf("got consistency proof\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, table.desc)
+ }
+ }
+}
+
+func validInclusionProof(t *testing.T) *InclusionProof {
+ t.Helper()
+ return &InclusionProof{
+ LeafIndex: 1,
+ TreeSize: 4,
+ Path: []Hash{
+ Hash{},
+ *newHashBufferInc(t),
+ },
+ }
+}
+
+func validInclusionProofASCII(t *testing.T) string {
+ t.Helper()
+ return fmt.Sprintf("%s=%d\n%s=%x\n%s=%x\n",
+ "leaf_index", 1,
+ "inclusion_path", Hash{},
+ "inclusion_path", newHashBufferInc(t)[:],
+ )
+}
+
+func validConsistencyProof(t *testing.T) *ConsistencyProof {
+ t.Helper()
+ return &ConsistencyProof{
+ NewSize: 1,
+ OldSize: 4,
+ Path: []Hash{
+ Hash{},
+ *newHashBufferInc(t),
+ },
+ }
+}
+
+func validConsistencyProofASCII(t *testing.T) string {
+ t.Helper()
+ return fmt.Sprintf("%s=%x\n%s=%x\n",
+ "consistency_path", Hash{},
+ "consistency_path", newHashBufferInc(t)[:],
+ )
+}
diff --git a/pkg/types/tree_head.go b/pkg/types/tree_head.go
new file mode 100644
index 0000000..0f1efee
--- /dev/null
+++ b/pkg/types/tree_head.go
@@ -0,0 +1,76 @@
+package types
+
+import (
+ "crypto"
+ "crypto/ed25519"
+ "encoding/binary"
+ "fmt"
+ "io"
+
+ "git.sigsum.org/sigsum-lib-go/pkg/ascii"
+)
+
+type TreeHead struct {
+ Timestamp uint64 `ascii:"timestamp"`
+ TreeSize uint64 `ascii:"tree_size"`
+ RootHash Hash `ascii:"root_hash"`
+}
+
+type SignedTreeHead struct {
+ TreeHead
+ Signature Signature `ascii:"signature"`
+}
+
+type CosignedTreeHead struct {
+ SignedTreeHead
+ Cosignature []Signature `ascii:"cosignature"`
+ KeyHash []Hash `ascii:"key_hash"`
+}
+
+func (th *TreeHead) ToBinary(keyHash *Hash) []byte {
+ b := make([]byte, 80)
+ binary.BigEndian.PutUint64(b[0:8], th.Timestamp)
+ binary.BigEndian.PutUint64(b[8:16], th.TreeSize)
+ copy(b[16:48], th.RootHash[:])
+ copy(b[48:80], keyHash[:])
+ return b
+}
+
+func (th *TreeHead) Sign(s crypto.Signer, ctx *Hash) (*SignedTreeHead, error) {
+ sig, err := s.Sign(nil, th.ToBinary(ctx), crypto.Hash(0))
+ if err != nil {
+ return nil, fmt.Errorf("types: failed signing tree head")
+ }
+
+ sth := &SignedTreeHead{
+ TreeHead: *th,
+ }
+ copy(sth.Signature[:], sig)
+ return sth, nil
+}
+
+func (sth *SignedTreeHead) ToASCII(w io.Writer) error {
+ return ascii.StdEncoding.Serialize(w, sth)
+}
+
+func (sth *SignedTreeHead) FromASCII(r io.Reader) error {
+ return ascii.StdEncoding.Deserialize(r, sth)
+}
+
+func (sth *SignedTreeHead) Verify(key *PublicKey, ctx *Hash) bool {
+ return ed25519.Verify(ed25519.PublicKey(key[:]), sth.TreeHead.ToBinary(ctx), sth.Signature[:])
+}
+
+func (cth *CosignedTreeHead) ToASCII(w io.Writer) error {
+ return ascii.StdEncoding.Serialize(w, cth)
+}
+
+func (cth *CosignedTreeHead) FromASCII(r io.Reader) error {
+ if err := ascii.StdEncoding.Deserialize(r, cth); err != nil {
+ return err
+ }
+ if len(cth.Cosignature) != len(cth.KeyHash) {
+ return fmt.Errorf("types: mismatched cosignature count")
+ }
+ return nil
+}
diff --git a/pkg/types/tree_head_test.go b/pkg/types/tree_head_test.go
new file mode 100644
index 0000000..03a52f5
--- /dev/null
+++ b/pkg/types/tree_head_test.go
@@ -0,0 +1,253 @@
+package types
+
+import (
+ "bytes"
+ "crypto"
+ "fmt"
+ "io"
+ "reflect"
+ "testing"
+)
+
+func TestTreeHeadToBinary(t *testing.T) {
+ desc := "valid"
+ kh := Hash{}
+ if got, want := validTreeHead(t).ToBinary(&kh), validTreeHeadBytes(t, &kh); !bytes.Equal(got, want) {
+ t.Errorf("got tree head\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, desc)
+ }
+}
+
+func TestTreeHeadSign(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ th *TreeHead
+ signer crypto.Signer
+ wantSig *Signature
+ wantErr bool
+ }{
+ {
+ desc: "invalid: signer error",
+ th: validTreeHead(t),
+ signer: &testSigner{*newPubBufferInc(t), *newSigBufferInc(t), fmt.Errorf("signing error")},
+ wantErr: true,
+ },
+ {
+ desc: "valid",
+ th: validTreeHead(t),
+ signer: &testSigner{*newPubBufferInc(t), *newSigBufferInc(t), nil},
+ wantSig: newSigBufferInc(t),
+ },
+ } {
+ logKey := PublicKey{}
+ sth, err := table.th.Sign(table.signer, HashFn(logKey[:]))
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+
+ wantSTH := &SignedTreeHead{
+ TreeHead: *table.th,
+ Signature: *table.wantSig,
+ }
+ if got, want := sth, wantSTH; !reflect.DeepEqual(got, want) {
+ t.Errorf("got sth\n\t%v\nbut wanted\n\t%v\nin test %q", got, want, table.desc)
+ }
+ }
+}
+
+func TestSignedTreeHeadToASCII(t *testing.T) {
+ desc := "valid"
+ buf := bytes.NewBuffer(nil)
+ if err := validSignedTreeHead(t).ToASCII(buf); err != nil {
+ t.Fatalf("got error true but wanted false in test %q: %v", desc, err)
+ }
+ if got, want := string(buf.Bytes()), validSignedTreeHeadASCII(t); got != want {
+ t.Errorf("got signed tree head\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, desc)
+ }
+}
+
+func TestSignedTreeHeadFromASCII(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ serialized io.Reader
+ wantErr bool
+ want *SignedTreeHead
+ }{
+ {
+ desc: "invalid: not a signed tree head (unexpected key-value pair)",
+ serialized: bytes.NewBuffer(append(
+ []byte(validSignedTreeHeadASCII(t)),
+ []byte("key=4")...),
+ ),
+ wantErr: true,
+ },
+ {
+ desc: "valid",
+ serialized: bytes.NewBuffer([]byte(validSignedTreeHeadASCII(t))),
+ want: validSignedTreeHead(t),
+ },
+ } {
+ var sth SignedTreeHead
+ err := sth.FromASCII(table.serialized)
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+ if got, want := &sth, table.want; !reflect.DeepEqual(got, want) {
+ t.Errorf("got signed tree head\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, table.desc)
+ }
+ }
+}
+
+func TestSignedTreeHeadVerify(t *testing.T) {
+ th := validTreeHead(t)
+ signer, pub := newKeyPair(t)
+ ctx := HashFn(pub[:])
+
+ sth, err := th.Sign(signer, ctx)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ if !sth.Verify(&pub, ctx) {
+ t.Errorf("failed verifying a valid signed tree head")
+ }
+
+ sth.TreeSize += 1
+ if sth.Verify(&pub, ctx) {
+ t.Errorf("succeeded verifying an invalid signed tree head")
+ }
+}
+
+func TestCosignedTreeHeadToASCII(t *testing.T) {
+ desc := "valid"
+ buf := bytes.NewBuffer(nil)
+ if err := validCosignedTreeHead(t).ToASCII(buf); err != nil {
+ t.Fatalf("got error true but wanted false in test %q: %v", desc, err)
+ }
+ if got, want := string(buf.Bytes()), validCosignedTreeHeadASCII(t); got != want {
+ t.Errorf("got cosigned tree head\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, desc)
+ }
+}
+
+func TestCosignedTreeHeadFromASCII(t *testing.T) {
+ for _, table := range []struct {
+ desc string
+ serialized io.Reader
+ wantErr bool
+ want *CosignedTreeHead
+ }{
+ {
+ desc: "invalid: not a cosigned tree head (unexpected key-value pair)",
+ serialized: bytes.NewBuffer(append(
+ []byte(validCosignedTreeHeadASCII(t)),
+ []byte("key=4")...),
+ ),
+ wantErr: true,
+ },
+ {
+ desc: "invalid: not a cosigned tree head (not enough cosignatures)",
+ serialized: bytes.NewBuffer(append(
+ []byte(validCosignedTreeHeadASCII(t)),
+ []byte(fmt.Sprintf("key_hash=%x\n", Hash{}))...,
+ )),
+ wantErr: true,
+ },
+ {
+ desc: "valid",
+ serialized: bytes.NewBuffer([]byte(validCosignedTreeHeadASCII(t))),
+ want: validCosignedTreeHead(t),
+ },
+ } {
+ var cth CosignedTreeHead
+ err := cth.FromASCII(table.serialized)
+ if got, want := err != nil, table.wantErr; got != want {
+ t.Errorf("got error %v but wanted %v in test %q: %v", got, want, table.desc, err)
+ }
+ if err != nil {
+ continue
+ }
+ if got, want := &cth, table.want; !reflect.DeepEqual(got, want) {
+ t.Errorf("got cosigned tree head\n\t%v\nbut wanted\n\t%v\nin test %q\n", got, want, table.desc)
+ }
+ }
+}
+
+func validTreeHead(t *testing.T) *TreeHead {
+ return &TreeHead{
+ Timestamp: 72623859790382856,
+ TreeSize: 257,
+ RootHash: *newHashBufferInc(t),
+ }
+}
+
+func validTreeHeadBytes(t *testing.T, keyHash *Hash) []byte {
+ return bytes.Join([][]byte{
+ []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08},
+ []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01},
+ newHashBufferInc(t)[:],
+ keyHash[:],
+ }, nil)
+}
+
+func validSignedTreeHead(t *testing.T) *SignedTreeHead {
+ t.Helper()
+ return &SignedTreeHead{
+ TreeHead: TreeHead{
+ Timestamp: 1,
+ TreeSize: 2,
+ RootHash: *newHashBufferInc(t),
+ },
+ Signature: *newSigBufferInc(t),
+ }
+}
+
+func validSignedTreeHeadASCII(t *testing.T) string {
+ t.Helper()
+ return fmt.Sprintf("%s=%d\n%s=%d\n%s=%x\n%s=%x\n",
+ "timestamp", 1,
+ "tree_size", 2,
+ "root_hash", newHashBufferInc(t)[:],
+ "signature", newSigBufferInc(t)[:],
+ )
+}
+
+func validCosignedTreeHead(t *testing.T) *CosignedTreeHead {
+ t.Helper()
+ return &CosignedTreeHead{
+ SignedTreeHead: SignedTreeHead{
+ TreeHead: TreeHead{
+ Timestamp: 1,
+ TreeSize: 2,
+ RootHash: *newHashBufferInc(t),
+ },
+ Signature: *newSigBufferInc(t),
+ },
+ Cosignature: []Signature{
+ Signature{},
+ *newSigBufferInc(t),
+ },
+ KeyHash: []Hash{
+ Hash{},
+ *newHashBufferInc(t),
+ },
+ }
+}
+
+func validCosignedTreeHeadASCII(t *testing.T) string {
+ t.Helper()
+ return fmt.Sprintf("%s=%d\n%s=%d\n%s=%x\n%s=%x\n%s=%x\n%s=%x\n%s=%x\n%s=%x\n",
+ "timestamp", 1,
+ "tree_size", 2,
+ "root_hash", newHashBufferInc(t)[:],
+ "signature", newSigBufferInc(t)[:],
+ "cosignature", Signature{},
+ "cosignature", newSigBufferInc(t)[:],
+ "key_hash", Hash{},
+ "key_hash", newHashBufferInc(t)[:],
+ )
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 09:50:52 +0000