Initial commit

app/interface/main/app-wall/dao/padding/BUILD

@@ -0,0 +1,38 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_test",
+    "go_library",
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["padding_test.go"],
+    embed = [":go_default_library"],
+    rundir = ".",
+    tags = ["automanaged"],
+    deps = ["//vendor/github.com/smartystreets/goconvey/convey:go_default_library"],
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["padding.go"],
+    importpath = "go-common/app/interface/main/app-wall/dao/padding",
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

app/interface/main/app-wall/dao/padding/padding.go

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+package padding
+
+import "errors"
+
+var (
+	ErrPaddingSize = errors.New("pkcs5 padding size error")
+	PKCS5          = &pkcs5{}
+)
+
+// pkcs5Padding is a pkcs5 padding struct.
+type pkcs5 struct{}
+
+// Padding is interface used for crypto.
+type Padding interface {
+	Padding(src []byte, blockSize int) []byte
+	Unpadding(src []byte, blockSize int) ([]byte, error)
+}
+
+// Padding implements the Padding interface Padding method.
+func (p *pkcs5) Padding(src []byte, blockSize int) []byte {
+	srcLen := len(src)
+	padLen := byte(blockSize - (srcLen % blockSize))
+	pd := make([]byte, srcLen+int(padLen))
+	copy(pd, src)
+	for i := srcLen; i < len(pd); i++ {
+		pd[i] = padLen
+	}
+	return pd
+}
+
+// Unpadding implements the Padding interface Unpadding method.
+func (p *pkcs5) Unpadding(src []byte, blockSize int) ([]byte, error) {
+	srcLen := len(src)
+	paddingLen := int(src[srcLen-1])
+	if paddingLen >= srcLen || paddingLen > blockSize {
+		return nil, ErrPaddingSize
+	}
+	return src[:srcLen-paddingLen], nil
+}

app/interface/main/app-wall/dao/padding/padding_test.go

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+package padding
+
+import (
+	"testing"
+	"time"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+var (
+	p *pkcs5
+)
+
+func init() {
+	p = &pkcs5{}
+	time.Sleep(time.Second)
+}
+
+func TestPadding(t *testing.T) {
+	Convey("Padding", t, func() {
+		res := p.Padding([]byte{}, 1)
+		So(res, ShouldNotBeEmpty)
+	})
+}