diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
new file mode 100644
index 00000000..968ba538
--- /dev/null
+++ b/.github/workflows/go.yml
@@ -0,0 +1,38 @@
+# This workflow will build a golang project
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go
+
+name: Go
+
+on:
+  push:
+    branches: [ "*" ]
+    # Build semver tags as releases.
+    tags: [ '*' ]
+  pull_request:
+    branches: [ "*" ]
+    # Build semver tags as releases.
+    tags: [ '*' ]
+  workflow_dispatch:
+
+jobs:
+
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["windows-latest", "ubuntu-latest", "ubuntu-22.04", "ubuntu-20.04", "macos-latest"]
+        go-version: ["1.24", "1.23", "1.22", "1.21", "1.20", "1.19", "1.18"]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ matrix.go-version }}
+
+    - name: Build
+      run: go build -v ./...
+
+    - name: Test
+      run: go test -v ./...
diff --git a/sm4/sm4.go b/sm4/sm4.go
index 0e301deb..1778795b 100644
--- a/sm4/sm4.go
+++ b/sm4/sm4.go
@@ -299,7 +299,7 @@ func SetIV(iv []byte) error {
 	return nil
 }
 
-func Sm4Cbc(key []byte, in []byte, mode bool) (out []byte, err error) {
+func Sm4Cbc(key []byte, in []byte, mode bool, ivInput ...[]byte) (out []byte, err error) {
 	if len(key) != BlockSize {
 		return nil, errors.New("SM4: invalid key size " + strconv.Itoa(len(key)))
 	}
@@ -310,7 +310,14 @@ func Sm4Cbc(key []byte, in []byte, mode bool) (out []byte, err error) {
 		inData = in
 	}
 	iv := make([]byte, BlockSize)
-	copy(iv, IV)
+	if ivInput != nil {
+		if len(ivInput[0]) != BlockSize {
+			return nil, errors.New("SM4: invalid iv size")
+		}
+		copy(iv, ivInput[0])
+	} else {
+		copy(iv, IV)
+	}
 	out = make([]byte, len(inData))
 	c, err := NewCipher(key)
 	if err != nil {