75 lines
2.0 KiB
Go
75 lines
2.0 KiB
Go
package crypto
|
||
|
||
import (
|
||
"bytes"
|
||
"fmt"
|
||
|
||
"crypto/aes"
|
||
"crypto/cipher"
|
||
|
||
"math/rand/v2"
|
||
)
|
||
|
||
// DefaultAESKey 默认AES密钥(16字节)
|
||
var DefaultAESKey = []byte("f51d66a73d8a0927")
|
||
|
||
// GenerateAESKey 生成AES密钥
|
||
func GenerateAESKey(length int) ([]byte, error) {
|
||
if length != 16 && length != 24 && length != 32 {
|
||
return nil, fmt.Errorf("invalid key length: %d, must be 16, 24, or 32 bytes", length)
|
||
}
|
||
key := make([]byte, length)
|
||
src := rand.ChaCha8{}
|
||
_, err := src.Read(key)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
return key, nil
|
||
}
|
||
|
||
// PKCS5Padding 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...)
|
||
}
|
||
|
||
// PKCS5UnPadding 去除填充数据
|
||
func PKCS5UnPadding(origData []byte) []byte {
|
||
length := len(origData)
|
||
unpadding := int(origData[length-1])
|
||
return origData[:(length - unpadding)]
|
||
}
|
||
|
||
// AesEncrypt 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
|
||
}
|
||
|
||
// AesDecrypt 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
|
||
}
|