default

tools/aes.go

@@ -0,0 +1,55 @@
+package tools
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+)
+
+var Aeskey = []byte("snowywar12345678") //aeskey
+
+//@brief:填充明文
+func PKCS5Padding(plaintext []byte, blockSize int) []byte{
+	padding := blockSize-len(plaintext)%blockSize
+	padtext := bytes.Repeat([]byte{byte(padding)},padding)
+	return append(plaintext,padtext...)
+}
+
+//@brief:去除填充数据
+func PKCS5UnPadding(origData []byte) []byte{
+	length := len(origData)
+	unpadding := int(origData[length-1])
+	return origData[:(length - unpadding)]
+}
+
+//@brief:AES加密
+func AesEncrypt(origData, key []byte) ([]byte, error){
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	//AES分组长度为128位，所以blockSize=16，单位字节
+	blockSize := block.BlockSize()
+	origData = PKCS5Padding(origData,blockSize)
+	blockMode := cipher.NewCBCEncrypter(block,key[:blockSize])	//初始向量的长度必须等于块block的长度16字节
+	crypted := make([]byte, len(origData))
+	blockMode.CryptBlocks(crypted,origData)
+	return crypted, nil
+}
+
+//@brief:AES解密
+func AesDecrypt(crypted, key []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	//AES分组长度为128位，所以blockSize=16，单位字节
+	blockSize := block.BlockSize()
+	blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])	//初始向量的长度必须等于块block的长度16字节
+	origData := make([]byte, len(crypted))
+	blockMode.CryptBlocks(origData, crypted)
+	origData = PKCS5UnPadding(origData)
+	return origData, nil
+}