73 lines
2.4 KiB
Go
73 lines
2.4 KiB
Go
package common
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/md5"
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"encoding/base64"
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"encoding/hex"
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"errors"
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)
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func AesEncryptCBC(origData []byte, key []byte) string {
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// 分组秘钥
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// NewCipher该函数限制了输入k的长度必须为16, 24或者32
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key = Md5(key)[:24]
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block, _ := aes.NewCipher(key)
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blockSize := block.BlockSize() // 获取秘钥块的长度
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origData = pkcs7Padding(origData, blockSize) // 补全码
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//fmt.Println(blockSize)
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blockMode := cipher.NewCBCEncrypter(block, key[:blockSize]) // 加密模式
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//fmt.Println(string(Md5(key)[:blockSize]))
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encrypted := make([]byte, len(origData)) // 创建数组
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blockMode.CryptBlocks(encrypted, origData) // 加密
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return base64.StdEncoding.EncodeToString(encrypted)
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}
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func AesDecryptCBC(enc string, key []byte) (string, error) {
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key = Md5(key)[:24]
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encrypted, _ := base64.StdEncoding.DecodeString(enc)
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block, _ := aes.NewCipher(key) // 分组秘钥
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blockSize := block.BlockSize() // 获取秘钥块的长度
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blockMode := cipher.NewCBCDecrypter(block, key[:blockSize]) // 加密模式
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decrypted := make([]byte, len(encrypted)) // 创建数组
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blockMode.CryptBlocks(decrypted, encrypted) // 解密
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decrypted, err := pkcs7UnPadding(decrypted) // 去除补全码
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if err != nil {
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return "", err
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}
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return string(decrypted), nil
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}
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func pkcs5Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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func pkcs5UnPadding(origData []byte) []byte {
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length := len(origData)
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unpadding := int(origData[length-1])
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return origData[:(length - unpadding)]
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}
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func pkcs7Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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func pkcs7UnPadding(origData []byte) ([]byte, error) {
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length := len(origData)
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unpadding := int(origData[length-1])
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if length-unpadding < 0 {
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return []byte{}, errors.New("解密失败")
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}
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return origData[:(length - unpadding)], nil
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}
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func Md5(str []byte) []byte {
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h := md5.New()
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h.Write(str)
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//fmt.Println(hex.EncodeToString(h.Sum(nil)))
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return []byte(hex.EncodeToString(h.Sum(nil)))
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}
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