golang DES

package聽util

import聽(
	"bytes"
	"crypto/cipher"
	"crypto/des"
	"encoding/base64"
)


var聽(
	iv聽聽=聽[]byte{1,聽2,聽3,聽4,聽5,聽6,聽7,聽8}
	key聽=聽[]byte("java")
)

//DES加密
func聽DesEncrypt(data聽[]byte)聽string聽{
	result,聽_聽:=聽DesEncrypt(data,聽key,聽iv)
	return聽base64.StdEncoding.EncodeToString(result)
}

//DES解密
func聽DesDecrypt(base64Str聽string)聽string聽{
	result,聽err聽:=聽base64.StdEncoding.DecodeString(base64Str)
	if聽err聽!=聽nil聽{
		return聽""
	}
	origData,聽err聽:=聽DesDecrypt(result,聽key,聽iv)
	if聽err聽!=聽nil聽{
		return聽""
	}
	return聽string(origData)
}
func聽DesEncrypt(origData,聽key,聽iv聽[]byte)聽([]byte,聽error)聽{
	block,聽err聽:=聽des.NewCipher(key)
	if聽err聽!=聽nil聽{
		return聽nil,聽err
	}
	origData聽=聽PKCS5Padding(origData,聽block.BlockSize())
	blockMode聽:=聽cipher.NewCBCEncrypter(block,聽iv)
	crypted聽:=聽make([]byte,聽len(origData))
	blockMode.CryptBlocks(crypted,聽origData)
	return聽crypted,聽nil
}

func聽DesDecrypt(crypted,聽key,聽iv聽[]byte)聽([]byte,聽error)聽{
	block,聽err聽:=聽des.NewCipher(key)
	if聽err聽!=聽nil聽{
		return聽nil,聽err
	}
	blockMode聽:=聽cipher.NewCBCDecrypter(block,聽iv)
	origData聽:=聽make([]byte,聽len(crypted))
	blockMode.CryptBlocks(origData,聽crypted)
	origData聽=聽PKCS5UnPadding(origData)
	return聽origData,聽nil
}

func聽ZeroUnPadding(origData聽[]byte)聽[]byte聽{
	return聽bytes.TrimRightFunc(origData,聽func(r聽rune)聽bool聽{
		return聽r聽==聽rune(0)
	})
}

func聽PKCS5Padding(ciphertext聽[]byte,聽blockSize聽int)聽[]byte聽{
	padding聽:=聽blockSize聽-聽len(ciphertext)%blockSize
	padtext聽:=聽bytes.Repeat([]byte{byte(padding)},聽padding)
	return聽append(ciphertext,聽padtext...)
}

func聽PKCS5UnPadding(origData聽[]byte)聽[]byte聽{
	length聽:=聽len(origData)
	unpadding聽:=聽int(origData[length-1])
	return聽origData[:(length聽-聽unpadding)]
}