/
encrip.go
171 lines (159 loc) · 4.62 KB
/
encrip.go
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package utility
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/md5"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"fmt"
"io"
"time"
)
/*GeneredHashSha256 : Genera un hash con encriptacion sha256 */
func GeneredHashSha256(key string) string {
hash := sha256.New()
io.WriteString(hash, key)
text := hex.EncodeToString(hash.Sum(nil))
return text
}
/*GeneredHashMd5 : Genera un hash con encriptacion md5 */
func GeneredHashMd5(key string) string {
hasher := md5.New()
hasher.Write([]byte(key))
return hex.EncodeToString(hasher.Sum(nil))
}
/*EncripAES : Encripta en aes 256 un texto donde la key es la llave noce una llave secundaria y el texto a ecriptar */
func EncripAES(key string, text string) (string, error) {
textByte := StrtoByte(text)
bloque, err := aes.NewCipher([]byte(GeneredHashMd5(key)))
if err != nil {
fmt.Println(err.Error())
return "", fmt.Errorf("error generating phisher")
}
gcm, err := cipher.NewGCM(bloque)
if err != nil {
return "", fmt.Errorf("error generating block")
}
nonce := make([]byte, gcm.NonceSize())
if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
return "", fmt.Errorf("failed to read the block")
}
textoEncrip := gcm.Seal(nonce, nonce, textByte, nil)
return BytetoStrHex(textoEncrip), nil
}
/*DesencripAES : Desencripta en aes 256 un texto donde la key es la llave noce una llave secundaria y el texto a ecriptar */
func DesencripAES(key string, text string) (string, error) {
textByte := StrtoByteHex(text)
keyHash := []byte(GeneredHashMd5(key))
bloque, err := aes.NewCipher(keyHash)
if err != nil {
return "", fmt.Errorf("error generating phisher")
}
gcm, err := cipher.NewGCM(bloque)
if err != nil {
return "", fmt.Errorf("error generating block")
}
nonceSize := gcm.NonceSize()
if nonceSize > len(textByte) {
return "", fmt.Errorf("failed to open the block")
}
nonce, ciphertext := textByte[:nonceSize], textByte[nonceSize:]
textoDesencrip, err := gcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return "", fmt.Errorf("failed to open the block")
}
return BytetoStr(textoDesencrip), nil
}
/*GenToken : Genera un token dependiendo de un string.*/
func GenToken(str string) string {
return GeneredHashSha256(StrRand(len(str), false) + string(rune(time.Now().Second())))
}
/*GeneredUUID : Genera un codigo uuid unico */
func GeneredUUID() string {
b := make([]byte, 16)
_, err := rand.Read(b)
if err != nil {
return ""
}
return fmt.Sprintf("%X-%X-%X-%X-%X", b[0:4], b[4:6], b[6:8], b[8:10], b[10:])
}
/*
Encriptacion AES AES/CBC/PKCS5Padding
*/
/*EncryptCBC : encrip AES/CBC/PKCS5Padding*/
func EncryptCBC(src, sKey, ivParameter string) string {
key := []byte(sKey)
iv := []byte(ivParameter)
result, err := aes128Encrypt([]byte(src), key, iv)
if err != nil {
panic(err)
}
return base64.RawStdEncoding.EncodeToString(result)
}
/*DecryptCBC : encrip AES/CBC/PKCS5Padding*/
func DecryptCBC(src, sKey, ivParameter string) string {
key := []byte(sKey)
iv := []byte(ivParameter)
var result []byte
var err error
result, err = base64.RawStdEncoding.DecodeString(src)
if err != nil {
panic(err)
}
origData, err := aes128Decrypt(result, key, iv)
if err != nil {
panic(err)
}
return string(origData)
}
func aes128Encrypt(origData, key []byte, IV []byte) ([]byte, error) {
if key == nil || len(key) != 16 {
return nil, nil
}
if IV != nil && len(IV) != 16 {
return nil, nil
}
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
origData = pKCS5Padding(origData, blockSize)
blockMode := cipher.NewCBCEncrypter(block, 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
blockMode.CryptBlocks(crypted, origData)
return crypted, nil
}
func aes128Decrypt(crypted, key []byte, IV []byte) ([]byte, error) {
if key == nil || len(key) != 16 {
return nil, nil
}
if IV != nil && len(IV) != 16 {
return nil, nil
}
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, IV[:blockSize])
origData := make([]byte, len(crypted))
blockMode.CryptBlocks(origData, crypted)
origData = pKCS5UnPadding(origData)
return origData, nil
}
func pKCS5Padding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(ciphertext, padtext...)
}
func pKCS5UnPadding(origData []byte) []byte {
length := len(origData)
// 去掉最后一个字节 unpadding 次
unpadding := int(origData[length-1])
return origData[:(length - unpadding)]
}