72 lines
2.5 KiB
Go
72 lines
2.5 KiB
Go
package mycrypto
|
||
|
||
import (
|
||
"bytes"
|
||
"crypto/aes"
|
||
"crypto/cipher"
|
||
"service/library/configcenter"
|
||
"service/library/logger"
|
||
)
|
||
|
||
type AesCrypto struct {
|
||
aesPriKey []byte
|
||
}
|
||
|
||
func NewAesCrypto(cryptoConfig *configcenter.CryptoConfig) (aesCrypto *AesCrypto, err error) {
|
||
aesCrypto = &AesCrypto{}
|
||
|
||
//读取私钥
|
||
if aesCrypto.readAESPriKey(cryptoConfig) != nil {
|
||
logger.Error("read rsa primary key failed!", err)
|
||
return
|
||
}
|
||
return
|
||
}
|
||
|
||
func (aesCrypto *AesCrypto) Encrypt(msg []byte) (encryptedBytes []byte, err error) {
|
||
//CBC加密
|
||
block, err := aes.NewCipher(aesCrypto.aesPriKey) //block
|
||
if err != nil {
|
||
logger.Error("AES NewCipher failed!, err: %v", err)
|
||
return nil, err
|
||
}
|
||
blockSize := block.BlockSize() //密钥块长度
|
||
paddedData := aesCrypto.pkcs5Padding(msg, blockSize) //填充
|
||
blockMode := cipher.NewCBCEncrypter(block, aesCrypto.aesPriKey[:blockSize]) //加密模式
|
||
encryptedBytes = make([]byte, len(paddedData)) //创建数组
|
||
blockMode.CryptBlocks(encryptedBytes, paddedData) //加密
|
||
return
|
||
}
|
||
|
||
func (aesCrypto *AesCrypto) Decrypt(encryptedBytes []byte) (decryptedBytes []byte, err error) {
|
||
if len(encryptedBytes) == 0 {
|
||
return
|
||
}
|
||
//CBC解密
|
||
block, _ := aes.NewCipher(aesCrypto.aesPriKey) // 分组秘钥
|
||
blockSize := block.BlockSize() // 获取秘钥块的长度
|
||
blockMode := cipher.NewCBCDecrypter(block, aesCrypto.aesPriKey[:blockSize]) // 加密模式
|
||
decryptedBytes = make([]byte, len(encryptedBytes)) // 创建数组
|
||
blockMode.CryptBlocks(decryptedBytes, encryptedBytes) // 解密
|
||
decryptedBytes = aesCrypto.pkcs5UnPadding(decryptedBytes) // 去除补全码
|
||
return
|
||
}
|
||
|
||
func (aesCrypto *AesCrypto) readAESPriKey(cryptoConfig *configcenter.CryptoConfig) (err error) {
|
||
//读取私钥
|
||
aesCrypto.aesPriKey = []byte(cryptoConfig.AESPrivateKey)
|
||
return
|
||
}
|
||
|
||
func (aesCrypto *AesCrypto) pkcs5Padding(ciphertext []byte, blockSize int) []byte {
|
||
padding := blockSize - len(ciphertext)%blockSize //判断缺少几位长度。最少1，最多 blockSize
|
||
padtext := bytes.Repeat([]byte{byte(padding)}, padding) //补足位数。把切片[]byte{byte(padding)}复制padding个
|
||
return append(ciphertext, padtext...)
|
||
}
|
||
|
||
func (aesCrypto *AesCrypto) pkcs5UnPadding(origData []byte) []byte {
|
||
length := len(origData)
|
||
unpadding := int(origData[length-1])
|
||
return origData[:(length - unpadding)]
|
||
}
|