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aes.go
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aes.go
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package crypto
import (
"crypto/aes"
"crypto/cipher"
)
//AES ...
type AES struct {
key []byte
//iv的长度必须等于block块的大小,这里是16字节,固定
iv []byte
}
//NewAES 密钥长度为 16,24,32 字节,三种
func NewAES(key, iv []byte) *AES {
return &AES{key: key, iv: iv}
}
//Encrypt ...
func (a *AES) Encrypt(origData []byte) ([]byte, error) {
block, err := aes.NewCipher(a.key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
origData = PKCS5Padding(origData, blockSize)
// origData = ZeroPadding(origData, block.BlockSize())
blockMode := cipher.NewCBCEncrypter(block, a.iv[:blockSize])
crypted := make([]byte, len(origData))
// 根据CryptBlocks方法的说明,如下方式初始化crypted也可以
// crypted := origData
blockMode.CryptBlocks(crypted, origData)
return crypted, nil
}
//Decrypt ...
func (a *AES) Decrypt(crypted []byte) ([]byte, error) {
block, err := aes.NewCipher(a.key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, a.iv[:blockSize])
origData := make([]byte, len(crypted))
// origData := crypted
blockMode.CryptBlocks(origData, crypted)
origData = PKCS5UnPadding(origData)
// origData = ZeroUnPadding(origData)
return origData, nil
}