3 files changed, 96 insertions, 2 deletions
diff --git a/types/namespace_test.go b/types/namespace_test.go
index c38d295..a5847ef 100644
--- a/types/namespace_test.go
+++ b/types/namespace_test.go
@@ -146,8 +146,7 @@ func test_cases_verify(t *testing.T) []testCaseNamespace {
 // test_cases_verify_ed25519v1 returns ed25519_v1 Namespace.Verify() tests
 func test_cases_verify_ed25519v1(t *testing.T) []testCaseNamespace {
 	testEd25519Sk := [64]byte{230, 122, 195, 152, 194, 195, 147, 153, 80, 120, 153, 79, 102, 27, 52, 187, 136, 218, 150, 234, 107, 9, 167, 4, 92, 21, 11, 113, 42, 29, 129, 69, 75, 60, 249, 150, 229, 93, 75, 32, 103, 126, 244, 37, 53, 182, 68, 82, 249, 109, 49, 94, 10, 19, 146, 244, 58, 191, 169, 107, 78, 37, 45, 210}
-	testEd25519Vk := [32]byte{75, 60, 249, 150, 229, 93, 75, 32, 103, 126, 244, 37, 53, 182, 68, 82, 249, 109, 49, 94, 10, 19, 146, 244, 58, 191, 169, 107, 78,
-		37, 45, 210}
+	testEd25519Vk := [32]byte{75, 60, 249, 150, 229, 93, 75, 32, 103, 126, 244, 37, 53, 182, 68, 82, 249, 109, 49, 94, 10, 19, 146, 244, 58, 191, 169, 107, 78, 37, 45, 210}
 	return []testCaseNamespace{
 		{
 			description: "test_cases_verify_ed25519v1: invalid: sk signed message, but vk is not for sk",
diff --git a/types/stitem.go b/types/stitem.go
index b214082..447cad0 100644
--- a/types/stitem.go
+++ b/types/stitem.go
@@ -119,3 +119,74 @@ func (i StItem) String() string {
 		return fmt.Sprintf("unknown StItem: %v", i.Format)
 	}
 }
+
+func NewSignedTreeHeadV1(th *TreeHeadV1, sig *SignatureV1) *StItem {
+	return &StItem{
+		Format: StFormatSignedTreeHeadV1,
+		SignedTreeHeadV1: &SignedTreeHeadV1{
+			TreeHead:  *th,
+			Signature: *sig,
+		},
+	}
+}
+
+func NewCosignedTreeHeadV1(sth *SignedTreeHeadV1, cosig []SignatureV1) *StItem {
+	if cosig == nil {
+		cosig = make([]SignatureV1, 0)
+	}
+	return &StItem{
+		Format: StFormatCosignedTreeHeadV1,
+		CosignedTreeHeadV1: &CosignedTreeHeadV1{
+			SignedTreeHead: *sth,
+			Cosignatures:   cosig,
+		},
+	}
+}
+
+func NewConsistencyProofV1(id *Namespace, size1, size2 uint64, path []NodeHash) *StItem {
+	return &StItem{
+		Format: StFormatConsistencyProofV1,
+		ConsistencyProofV1: &ConsistencyProofV1{
+			LogId:           *id,
+			TreeSize1:       size1,
+			TreeSize2:       size2,
+			ConsistencyPath: path,
+		},
+	}
+}
+
+func NewInclusionProofV1(id *Namespace, size, index uint64, path []NodeHash) *StItem {
+	return &StItem{
+		Format: StFormatInclusionProofV1,
+		InclusionProofV1: &InclusionProofV1{
+			LogId:         *id,
+			TreeSize:      size,
+			LeafIndex:     index,
+			InclusionPath: path,
+		},
+	}
+}
+
+func NewSignedChecksumV1(data *ChecksumV1, sig *SignatureV1) *StItem {
+	return &StItem{
+		Format: StFormatSignedChecksumV1,
+		SignedChecksumV1: &SignedChecksumV1{
+			Data:      *data,
+			Signature: *sig,
+		},
+	}
+}
+
+func NewTreeHeadV1(timestamp, size uint64, hash, extension []byte) *TreeHeadV1 {
+	if extension == nil {
+		extension = make([]byte, 0)
+	}
+	return &TreeHeadV1{
+		Timestamp: timestamp,
+		TreeSize:  size,
+		RootHash: NodeHash{
+			Data: hash,
+		},
+		Extension: extension,
+	}
+}
diff --git a/types/stitem_test.go b/types/stitem_test.go
index c6e413a..90d6808 100644
--- a/types/stitem_test.go
+++ b/types/stitem_test.go
@@ -38,3 +38,27 @@ func TestStItemString(t *testing.T) {
 		}
 	}
 }
+
+// TODO: TestNewSignedTreeHeadV1
+func TestNewSignedTreeHeadV1(t *testing.T) {
+}
+
+// TODO: TestNewCosignedTreeHeadV1
+func TestNewCosignedTreeHeadV1(t *testing.T) {
+}
+
+// TODO: TestNewConsistencyProofV1
+func TestNewConsistencyProofV1(t *testing.T) {
+}
+
+// TODO: TestNewInclusionProofV1
+func TestNewInclusionProofV1(t *testing.T) {
+}
+
+// TODO: TestNewSignedChecksumV1
+func TestNewSignedChecksumV1(t *testing.T) {
+}
+
+// TODO: TestNewTreeHeadV1
+func TestNewTreeHeadV1(t *testing.T) {
+}