build: update go version

.github/workflows/build.yml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17]
+        go: ['1.18', '1.19', '1.20']
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
           go-version: ${{ matrix.go }}
 
@@ -24,7 +24,7 @@ jobs:
         run: |
           go test -race -covermode atomic -coverprofile=covprofile ./...
       - name: Install goveralls
-        run: go get github.com/mattn/goveralls
+        run: go install github.com/mattn/goveralls@latest
       - name: Send coverage
         env:
           COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}

cbc.go

@@ -42,13 +42,13 @@ func CBCDecrypt(block cipher.Block, src, iv []byte, padding string) ([]byte, err
 }
 
 // cbcIVPending auto pad length to block size
-func cbcIVPending(iv []byte, blockSize int)[]byte  {
+func cbcIVPending(iv []byte, blockSize int) []byte {
 	k := len(iv)
-	if k < blockSize{
-		return append(iv, bytes.Repeat([]byte{0}, blockSize - k)...)
-	}else if k > blockSize{
-		return iv[0: blockSize]
+	if k < blockSize {
+		return append(iv, bytes.Repeat([]byte{0}, blockSize-k)...)
+	} else if k > blockSize {
+		return iv[0:blockSize]
 	}
 
 	return iv
-}
+}

go.mod

@@ -1,5 +1,5 @@
 module github.com/forgoer/openssl
 
-go 1.12
+go 1.13
 
 require github.com/stretchr/testify v1.4.0