forked from iikira/Baidu-Login
/
aes.go
388 lines (309 loc) · 10.2 KB
/
aes.go
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package bdcrypto
import (
"bytes"
"crypto/aes"
"crypto/cipher"
cryptorand "crypto/rand"
"fmt"
"github.com/iikira/Baidu-Login/bdcrypto/ecb"
"io"
)
// AesMode AES 工作模式
type AesMode int
const (
// AesECB ecb 模式
AesECB AesMode = iota
// AesCBC cbc 模式
AesCBC
// AesCTR ctr 模式
AesCTR
// AesCFB cfb 模式
AesCFB
// AesOFB ofb 模式
AesOFB
)
// Aes128ECBEncrypt aes-128-ecb 加密
func Aes128ECBEncrypt(key [16]byte, plaintext []byte) (ciphertext []byte, err error) {
return aesECBEnc(key[:], plaintext)
}
// Aes128ECBDecrypt aes-128-ecb 解密
func Aes128ECBDecrypt(key [16]byte, ciphertext []byte) (plaintext []byte, err error) {
return aesECBDec(key[:], ciphertext)
}
// Aes192ECBEncrypt aes-192-ecb 加密
func Aes192ECBEncrypt(key [24]byte, plaintext []byte) (ciphertext []byte, err error) {
return aesECBEnc(key[:], plaintext)
}
// Aes192ECBDecrypt aes-192-ecb 解密
func Aes192ECBDecrypt(key [24]byte, ciphertext []byte) (plaintext []byte, err error) {
return aesECBDec(key[:], ciphertext)
}
// Aes256ECBEncrypt aes-256-ecb 加密
func Aes256ECBEncrypt(key [32]byte, plaintext []byte) (ciphertext []byte, err error) {
return aesECBEnc(key[:], plaintext)
}
// Aes256ECBDecrypt aes-256-ecb 解密
func Aes256ECBDecrypt(key [32]byte, ciphertext []byte) (plaintext []byte, err error) {
return aesECBDec(key[:], ciphertext)
}
// Aes128CBCEncrypt aes-128-cbc 加密
func Aes128CBCEncrypt(key [16]byte, plaintext []byte) (ciphertext []byte, err error) {
return aesCBCEnc(key[:], plaintext)
}
// Aes128CBCDecrypt aes-128-cbc 解密
func Aes128CBCDecrypt(key [16]byte, ciphertext []byte) (plaintext []byte, err error) {
return aesCBCDec(key[:], ciphertext)
}
// Aes192CBCEncrypt aes-192-cbc 加密
func Aes192CBCEncrypt(key [24]byte, plaintext []byte) (ciphertext []byte, err error) {
return aesCBCEnc(key[:], plaintext)
}
// Aes192CBCDecrypt aes-192-cbc 解密
func Aes192CBCDecrypt(key [24]byte, ciphertext []byte) (plaintext []byte, err error) {
return aesCBCDec(key[:], ciphertext)
}
// Aes256CBCEncrypt aes-256-cbc 加密
func Aes256CBCEncrypt(key [32]byte, plaintext []byte) (ciphertext []byte, err error) {
return aesCBCEnc(key[:], plaintext)
}
// Aes256CBCDecrypt aes-256-cbc 解密
func Aes256CBCDecrypt(key [32]byte, ciphertext []byte) (plaintext []byte, err error) {
return aesCBCDec(key[:], ciphertext)
}
// Aes128CTREncrypt aes-128-ctr 加密
func Aes128CTREncrypt(key [16]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesCTREnc(key[:], plainReader)
}
// Aes128CTRDecrypt aes-128-ctr 解密
func Aes128CTRDecrypt(key [16]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesCTRDec(key[:], cipherReader)
}
// Aes192CTREncrypt aes-192-ctr 加密
func Aes192CTREncrypt(key [24]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesCTREnc(key[:], plainReader)
}
// Aes192CTRDecrypt aes-192-ctr 解密
func Aes192CTRDecrypt(key [24]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesCTRDec(key[:], cipherReader)
}
// Aes256CTREncrypt aes-256-ctr 加密
func Aes256CTREncrypt(key [32]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesCTREnc(key[:], plainReader)
}
// Aes256CTRDecrypt aes-256-ctr 解密
func Aes256CTRDecrypt(key [32]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesCTRDec(key[:], cipherReader)
}
// Aes128CFBEncrypt aes-128-cfb 加密
func Aes128CFBEncrypt(key [16]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesCFBEnc(key[:], plainReader)
}
// Aes128CFBDecrypt aes-128-cfb 解密
func Aes128CFBDecrypt(key [16]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesCFBDec(key[:], cipherReader)
}
// Aes192CFBEncrypt aes-192-cfb 加密
func Aes192CFBEncrypt(key [24]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesCFBEnc(key[:], plainReader)
}
// Aes192CFBDecrypt aes-192-cfb 解密
func Aes192CFBDecrypt(key [24]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesCFBDec(key[:], cipherReader)
}
// Aes256CFBEncrypt aes-256-cfb 加密
func Aes256CFBEncrypt(key [32]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesCFBEnc(key[:], plainReader)
}
// Aes256CFBDecrypt aes-256-cfb 解密
func Aes256CFBDecrypt(key [32]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesCFBDec(key[:], cipherReader)
}
// Aes128OFBEncrypt aes-128-ofb 加密
func Aes128OFBEncrypt(key [16]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesOFBEnc(key[:], plainReader)
}
// Aes128OFBDecrypt aes-128-ofb 解密
func Aes128OFBDecrypt(key [16]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesOFBDec(key[:], cipherReader)
}
// Aes192OFBEncrypt aes-192-ofb 加密
func Aes192OFBEncrypt(key [24]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesOFBEnc(key[:], plainReader)
}
// Aes192OFBDecrypt aes-192-ofb 解密
func Aes192OFBDecrypt(key [24]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesOFBDec(key[:], cipherReader)
}
// Aes256OFBEncrypt aes-256-ofb 加密
func Aes256OFBEncrypt(key [32]byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return aesOFBEnc(key[:], plainReader)
}
// Aes256OFBDecrypt aes-256-ofb 解密
func Aes256OFBDecrypt(key [32]byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return aesOFBDec(key[:], cipherReader)
}
// Convert16bytes 将 []byte 转为 [16]byte
func Convert16bytes(b []byte) (b16 [16]byte) {
copy(b16[:], b)
return
}
// Convert24bytes 将 []byte 转为 [24]byte
func Convert24bytes(b []byte) (b24 [24]byte) {
copy(b24[:], b)
return
}
// Convert32bytes 将 []byte 转为 [32]byte
func Convert32bytes(b []byte) (b32 [32]byte) {
copy(b32[:], b)
return
}
func aesECBEnc(key []byte, plaintext []byte) (ciphertext []byte, err error) {
block, err := aes.NewCipher(key) //选择加密算法
if err != nil {
return nil, err
}
plaintext = PKCS5Padding(plaintext, block.BlockSize())
blockModel := ecb.NewECBEncrypter(block)
ciphertext = plaintext
blockModel.CryptBlocks(ciphertext, plaintext)
return ciphertext, nil
}
func aesECBDec(key []byte, ciphertext []byte) (plaintext []byte, err error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockModel := ecb.NewECBDecrypter(block)
plaintext = ciphertext
blockModel.CryptBlocks(plaintext, ciphertext)
plaintext = PKCS5UnPadding(plaintext)
return plaintext, nil
}
func aesCBCEnc(key []byte, plaintext []byte) (ciphertext []byte, err error) {
block, err := aes.NewCipher(key) //选择加密算法
if err != nil {
return nil, err
}
plaintext = PKCS5Padding(plaintext, block.BlockSize())
ciphertext = make([]byte, aes.BlockSize+len(plaintext))
iv := ciphertext[:aes.BlockSize]
_, err = cryptorand.Read(iv[:])
if err != nil {
return nil, err
}
blockModel := cipher.NewCBCEncrypter(block, iv[:])
blockModel.CryptBlocks(ciphertext[aes.BlockSize:], plaintext)
return ciphertext, nil
}
func aesCBCDec(key []byte, ciphertext []byte) (plaintext []byte, err error) {
if len(ciphertext) < aes.BlockSize {
return nil, fmt.Errorf("ciphertext too short")
}
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
iv := ciphertext[:aes.BlockSize]
ciphertext = ciphertext[aes.BlockSize:]
// CBC mode always works in whole blocks.
if len(ciphertext)%aes.BlockSize != 0 {
return nil, fmt.Errorf("ciphertext is not a multiple of the block size")
}
blockModel := cipher.NewCBCDecrypter(block, iv)
plaintext = ciphertext
blockModel.CryptBlocks(plaintext, ciphertext)
plaintext = PKCS5UnPadding(plaintext)
return plaintext, nil
}
func aesCTREnc(key []byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return streamEnc(AesCTR, key, plainReader)
}
func aesCTRDec(key []byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return streamDec(AesCTR, key, cipherReader)
}
func aesCFBEnc(key []byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return streamEnc(AesCFB, key, plainReader)
}
func aesCFBDec(key []byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return streamDec(AesCFB, key, cipherReader)
}
func aesOFBEnc(key []byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
return streamEnc(AesOFB, key, plainReader)
}
func aesOFBDec(key []byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
return streamDec(AesOFB, key, cipherReader)
}
func streamEnc(aesMode AesMode, key []byte, plainReader io.Reader) (cipherReader io.Reader, err error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
// 随机初始化向量
var iv [aes.BlockSize]byte
cryptorand.Read(iv[:])
var stream cipher.Stream
switch aesMode {
case AesCTR:
stream = cipher.NewCTR(block, iv[:])
case AesCFB:
stream = cipher.NewCFBEncrypter(block, iv[:])
case AesOFB:
stream = cipher.NewOFB(block, iv[:])
default:
panic("unknown aes mode")
}
reader := &cipher.StreamReader{
S: stream,
R: plainReader,
}
return io.MultiReader(bytes.NewReader(iv[:]), reader), nil
}
func streamDec(aesMode AesMode, key []byte, cipherReader io.Reader) (plainReader io.Reader, err error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
var iv [aes.BlockSize]byte
// 读取头部向量
_, err = cipherReader.Read(iv[:])
if err != nil {
return
}
var stream cipher.Stream
switch aesMode {
case AesCTR:
stream = cipher.NewCTR(block, iv[:])
case AesCFB:
stream = cipher.NewCFBDecrypter(block, iv[:])
case AesOFB:
stream = cipher.NewOFB(block, iv[:])
default:
panic("unknown aes mode")
}
plainReader = &cipher.StreamReader{
S: stream,
R: cipherReader,
}
return
}
// PKCS5Padding PKCS5 Padding
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
if padding < 0 {
padding = 0
}
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(ciphertext, padtext...)
}
// PKCS5UnPadding PKCS5 UnPadding
func PKCS5UnPadding(plaintext []byte) []byte {
length := len(plaintext)
if length <= 0 {
return nil
}
unpadding := int(plaintext[length-1])
if length-unpadding < 0 {
return nil
}
return plaintext[:(length - unpadding)]
}