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crypto.go
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crypto.go
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package wx
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
)
// PaddingMode aes padding mode
type PaddingMode string
const (
// ZERO zero padding mode
ZERO PaddingMode = "ZERO"
// PKCS5 PKCS#5 padding mode
PKCS5 PaddingMode = "PKCS#5"
// PKCS7 PKCS#7 padding mode
PKCS7 PaddingMode = "PKCS#7"
)
// CBCCrypto aes-cbc crypto
type CBCCrypto struct {
key []byte
iv []byte
}
// NewCBCCrypto returns new aes-cbc crypto
func NewCBCCrypto(key, iv []byte) *CBCCrypto {
return &CBCCrypto{
key: key,
iv: iv,
}
}
// Encrypt aes-cbc encrypt
func (c *CBCCrypto) Encrypt(plainText []byte, mode PaddingMode) ([]byte, error) {
block, err := aes.NewCipher(c.key)
if err != nil {
return nil, err
}
if len(c.iv) != block.BlockSize() {
return nil, errors.New("yiigo: IV length must equal block size")
}
switch mode {
case ZERO:
plainText = ZeroPadding(plainText, block.BlockSize())
case PKCS5:
plainText = PKCS5Padding(plainText, block.BlockSize())
case PKCS7:
plainText = PKCS5Padding(plainText, len(c.key))
}
cipherText := make([]byte, len(plainText))
blockMode := cipher.NewCBCEncrypter(block, c.iv)
blockMode.CryptBlocks(cipherText, plainText)
return cipherText, nil
}
// Decrypt aes-cbc decrypt
func (c *CBCCrypto) Decrypt(cipherText []byte, mode PaddingMode) ([]byte, error) {
block, err := aes.NewCipher(c.key)
if err != nil {
return nil, err
}
if len(c.iv) != block.BlockSize() {
return nil, errors.New("yiigo: IV length must equal block size")
}
plainText := make([]byte, len(cipherText))
blockMode := cipher.NewCBCDecrypter(block, c.iv)
blockMode.CryptBlocks(plainText, cipherText)
switch mode {
case ZERO:
plainText = ZeroUnPadding(plainText)
case PKCS5:
plainText = PKCS5Unpadding(plainText, block.BlockSize())
case PKCS7:
plainText = PKCS5Unpadding(plainText, len(c.key))
}
return plainText, nil
}
// ECBCrypto aes-ecb crypto
type ECBCrypto struct {
key []byte
}
// NewECBCrypto returns new aes-ecb crypto
func NewECBCrypto(key []byte) *ECBCrypto {
return &ECBCrypto{key: key}
}
// Encrypt aes-ecb encrypt
func (c *ECBCrypto) Encrypt(plainText []byte, mode PaddingMode) ([]byte, error) {
block, err := aes.NewCipher(c.key)
if err != nil {
return nil, err
}
switch mode {
case ZERO:
plainText = ZeroPadding(plainText, block.BlockSize())
case PKCS5:
plainText = PKCS5Padding(plainText, block.BlockSize())
case PKCS7:
plainText = PKCS5Padding(plainText, len(c.key))
}
cipherText := make([]byte, len(plainText))
blockMode := NewECBEncrypter(block)
blockMode.CryptBlocks(cipherText, plainText)
return cipherText, nil
}
// Decrypt aes-ecb decrypt
func (c *ECBCrypto) Decrypt(cipherText []byte, mode PaddingMode) ([]byte, error) {
block, err := aes.NewCipher(c.key)
if err != nil {
return nil, err
}
plainText := make([]byte, len(cipherText))
blockMode := NewECBDecrypter(block)
blockMode.CryptBlocks(plainText, cipherText)
switch mode {
case ZERO:
plainText = ZeroUnPadding(plainText)
case PKCS5:
plainText = PKCS5Unpadding(plainText, block.BlockSize())
case PKCS7:
plainText = PKCS5Unpadding(plainText, len(c.key))
}
return plainText, nil
}
// RSAEncrypt rsa encryption with public key
func RSAEncrypt(data, publicKey []byte) ([]byte, error) {
block, _ := pem.Decode(publicKey)
if block == nil {
return nil, errors.New("gochat: invalid rsa public key")
}
pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, err
}
key, ok := pubKey.(*rsa.PublicKey)
if !ok {
return nil, errors.New("gochat: invalid rsa public key")
}
return rsa.EncryptPKCS1v15(rand.Reader, key, data)
}
// RSADecrypt rsa decryption with private key
func RSADecrypt(cipherText, privateKey []byte) ([]byte, error) {
block, _ := pem.Decode(privateKey)
if block == nil {
return nil, errors.New("gochat: invalid rsa private key")
}
key, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return rsa.DecryptPKCS1v15(rand.Reader, key, cipherText)
}
func ZeroPadding(cipherText []byte, blockSize int) []byte {
padding := blockSize - len(cipherText)%blockSize
padText := bytes.Repeat([]byte{0}, padding)
return append(cipherText, padText...)
}
func ZeroUnPadding(plainText []byte) []byte {
return bytes.TrimRightFunc(plainText, func(r rune) bool {
return r == rune(0)
})
}
func PKCS5Padding(cipherText []byte, blockSize int) []byte {
padding := blockSize - len(cipherText)%blockSize
if padding == 0 {
padding = blockSize
}
padText := bytes.Repeat([]byte{byte(padding)}, padding)
return append(cipherText, padText...)
}
func PKCS5Unpadding(plainText []byte, blockSize int) []byte {
l := len(plainText)
unpadding := int(plainText[l-1])
if unpadding < 1 || unpadding > blockSize {
unpadding = 0
}
return plainText[:(l - unpadding)]
}
// --------- AES-256-ECB ---------
type ecb struct {
b cipher.Block
blockSize int
}
func newECB(b cipher.Block) *ecb {
return &ecb{
b: b,
blockSize: b.BlockSize(),
}
}
type ecbEncrypter ecb
// NewECBEncrypter returns a BlockMode which encrypts in electronic code book mode, using the given Block.
func NewECBEncrypter(b cipher.Block) cipher.BlockMode {
return (*ecbEncrypter)(newECB(b))
}
func (x *ecbEncrypter) BlockSize() int { return x.blockSize }
func (x *ecbEncrypter) CryptBlocks(dst, src []byte) {
if len(src)%x.blockSize != 0 {
panic("crypto/cipher: input not full blocks")
}
if len(dst) < len(src) {
panic("crypto/cipher: output smaller than input")
}
for len(src) > 0 {
x.b.Encrypt(dst, src[:x.blockSize])
src = src[x.blockSize:]
dst = dst[x.blockSize:]
}
}
type ecbDecrypter ecb
// NewECBDecrypter returns a BlockMode which decrypts in electronic code book mode, using the given Block.
func NewECBDecrypter(b cipher.Block) cipher.BlockMode {
return (*ecbDecrypter)(newECB(b))
}
func (x *ecbDecrypter) BlockSize() int { return x.blockSize }
func (x *ecbDecrypter) CryptBlocks(dst, src []byte) {
if len(src)%x.blockSize != 0 {
panic("crypto/cipher: input not full blocks")
}
if len(dst) < len(src) {
panic("crypto/cipher: output smaller than input")
}
for len(src) > 0 {
x.b.Decrypt(dst, src[:x.blockSize])
src = src[x.blockSize:]
dst = dst[x.blockSize:]
}
}