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app/interface/main/report-click/service/crypto/padding/BUILD

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+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_test",
+    "go_library",
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["pkcs5_test.go"],
+    embed = [":go_default_library"],
+    rundir = ".",
+    tags = ["automanaged"],
+    deps = [
+        "//app/interface/main/report-click/service/crypto/cipher:go_default_library",
+        "//vendor/github.com/smartystreets/goconvey/convey:go_default_library",
+    ],
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "padding.go",
+        "pkcs5.go",
+    ],
+    importpath = "go-common/app/interface/main/report-click/service/crypto/padding",
+    tags = ["automanaged"],
+)
+
+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/report-click/service/crypto/padding/padding.go

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+package padding
+
+import (
+	"errors"
+)
+
+var (
+	ErrPaddingSize = errors.New("pkcs5 padding size error")
+)
+
+// Padding is interface used for crypto.
+type Padding interface {
+	Padding(src []byte, blockSize int) []byte
+	Unpadding(src []byte, blockSize int) ([]byte, error)
+}

app/interface/main/report-click/service/crypto/padding/pkcs5.go

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+package padding
+
+var (
+	PKCS5 = &pkcs5{}
+)
+
+// pkcs5Padding is a pkcs5 padding struct.
+type pkcs5 struct{}
+
+// 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/report-click/service/crypto/padding/pkcs5_test.go

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+package padding
+
+import (
+	iaes "crypto/aes"
+	"testing"
+
+	"go-common/app/interface/main/report-click/service/crypto/cipher"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestECB(t *testing.T) {
+	var (
+		aesKey = "903ef9925be1300f843b41df2ca55410"
+		bs     = []byte("this is  test massage ")
+	)
+	Convey("cipher test ", t, func() {
+		var p = PKCS5
+		bs = p.Padding(bs, iaes.BlockSize)
+		b, _ := iaes.NewCipher([]byte(aesKey))
+		ecbe := cipher.NewECBEncrypter(b)
+		encryptText := make([]byte, len(bs))
+		ecbe.CryptBlocks(encryptText, bs)
+		ecbd := cipher.NewECBDecrypter(b)
+		decryptText := make([]byte, len(bs))
+		ecbd.CryptBlocks(decryptText, bs)
+		p.Unpadding(bs, iaes.BlockSize)
+	})
+}