增加vendor

vendor/github.com/go-pay/gopay/pkg/aes/aes_cbc.go

@@ -0,0 +1,43 @@
+package aes
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"errors"
+)
+
+// AES-CBC 加密数据
+func CBCEncrypt(originData, key, iv []byte) ([]byte, error) {
+	return cbcEncrypt(originData, key, iv)
+}
+
+// AES-CBC 解密数据
+func CBCDecrypt(secretData, key, iv []byte) ([]byte, error) {
+	return cbcDecrypt(secretData, key, iv)
+}
+
+func cbcEncrypt(originData, key, iv []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	originData = PKCS7Padding(originData, block.BlockSize())
+	secretData := make([]byte, len(originData))
+	blockMode := cipher.NewCBCEncrypter(block, iv[:block.BlockSize()])
+	blockMode.CryptBlocks(secretData, originData)
+	return secretData, nil
+}
+
+func cbcDecrypt(secretData, key, iv []byte) (originByte []byte, err error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	originByte = make([]byte, len(secretData))
+	blockMode := cipher.NewCBCDecrypter(block, iv[:block.BlockSize()])
+	blockMode.CryptBlocks(originByte, secretData)
+	if len(originByte) == 0 {
+		return nil, errors.New("blockMode.CryptBlocks error")
+	}
+	return PKCS7UnPadding(originByte), nil
+}