添加 'encrypt/aes.go'

encrypt/aes.go

@@ -0,0 +1,111 @@
+package util
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/base64"
+	"encoding/hex"
+)
+
+type AES_CBC struct {
+	Key string //16位
+	Iv  string //16位
+}
+
+func (a AES_CBC) Encrypt(value string) (string, error) {
+	b, err := a.encrypt(value)
+	if err != nil {
+		return "", err
+	}
+	return base64.StdEncoding.EncodeToString(b), nil
+}
+
+func (a AES_CBC) EncryptHex(value string) (string, error) {
+	b, err := a.encrypt(value)
+	if err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(b), nil
+}
+
+func (a AES_CBC) encrypt(value string) ([]byte, error) {
+	defer Catch()
+	origData := []byte(value)
+	block, err := aes.NewCipher([]byte(a.Key))
+	if err != nil {
+		return nil, err
+	}
+	origData = a.PKCS5Padding(origData, block.BlockSize())
+	// origData = a.ZeroPadding(origData, block.BlockSize())
+	blockMode := cipher.NewCBCEncrypter(block, []byte(a.Iv))
+	crypted := make([]byte, len(origData))
+
+	blockMode.CryptBlocks(crypted, origData)
+	return crypted, nil
+}
+
+func (a AES_CBC) Decrypt(crypted string) (string, error) {
+	decodeData, err := base64.StdEncoding.DecodeString(crypted)
+	return a.decrypt(decodeData, err)
+}
+
+func (a AES_CBC) DecryptHex(crypted string) (string, error) {
+	decodeData, err := hex.DecodeString(crypted)
+	return a.decrypt(decodeData, err)
+}
+
+func (a AES_CBC) decrypt(decodeData []byte, err error) (string, error) {
+	defer Catch()
+	if err != nil {
+		return "", err
+	}
+	block, err := aes.NewCipher([]byte(a.Key))
+	if err != nil {
+		return "", err
+	}
+	//blockSize := block.BlockSize()
+	blockMode := cipher.NewCBCDecrypter(block, []byte(a.Iv))
+	origData := make([]byte, len(decodeData))
+	blockMode.CryptBlocks(origData, decodeData)
+	origData = a.PKCS5UnPadding(origData)
+	// origData = a.ZeroUnPadding(origData)
+	return string(origData), nil
+}
+
+func (a AES_CBC) ZeroPadding(ciphertext []byte, blockSize int) []byte {
+	padding := blockSize - len(ciphertext)%blockSize
+	padtext := bytes.Repeat([]byte{0}, padding)
+	return append(ciphertext, padtext...)
+}
+
+func (a AES_CBC) ZeroUnPadding(origData []byte) []byte {
+	length := len(origData)
+	if length == 0 {
+		return origData
+	}
+	unpadding := int(origData[length-1])
+	if length < unpadding {
+		return origData
+	}
+	return origData[:(length - unpadding)]
+}
+
+func (a AES_CBC) PKCS5Padding(ciphertext []byte, blockSize int) []byte {
+	padding := blockSize - len(ciphertext)%blockSize
+	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(ciphertext, padtext...)
+}
+
+func (a AES_CBC) PKCS5UnPadding(origData []byte) []byte {
+	length := len(origData)
+	if length == 0 {
+		return origData
+	}
+	// 去掉最后一个字节 unpadding 次
+	unpadding := int(origData[length-1])
+	if length < unpadding {
+		return origData
+	}
+	return origData[:(length - unpadding)]
+}