/
lib_enc.go
90 lines (82 loc) · 1.91 KB
/
lib_enc.go
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package lib
import (
"crypto/aes"
"crypto/cipher"
"crypto/md5"
"crypto/rand"
b64 "encoding/base64"
"encoding/hex"
"io"
"log"
)
const PASS_PHRASE = "lj3kasgdfjhg25fcmf"
func createHash(key string) string {
hasher := md5.New()
hasher.Write([]byte(key))
return hex.EncodeToString(hasher.Sum(nil))
}
func encrypt(data []byte, passphrase string) ([]byte, error) {
block, _ := aes.NewCipher([]byte(createHash(passphrase)))
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
nonce := make([]byte, gcm.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
return nil, err
}
ciphered := gcm.Seal(nonce, nonce, data, nil)
return ciphered, nil
}
func decrypt(data []byte, passphrase string) ([]byte, error) {
key := []byte(createHash(passphrase))
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
nonceSize := gcm.NonceSize()
if len(data) < nonceSize {
return nil, err
}
nonce, ciphered := data[:nonceSize], data[nonceSize:]
plaintext, err := gcm.Open(nil, nonce, ciphered, nil)
if err != nil {
return nil, err
}
return plaintext, nil
}
func Base64EncString(value string) string {
sEnc := b64.StdEncoding.EncodeToString([]byte(value))
return sEnc
}
func Base64DecString(value string) string {
sDec, err := b64.StdEncoding.DecodeString(value)
if err != nil {
log.Print(err)
return "Decode Error"
}
return string(sDec)
}
func EncryptString(value string) (string, error) {
data, err := encrypt([]byte(value), PASS_PHRASE)
if err != nil {
return value, err
}
sEnc := b64.StdEncoding.EncodeToString([]byte(data))
return sEnc, nil
}
func DecryptString(value string) (string, error) {
sDec, err := b64.StdEncoding.DecodeString(value)
if err != nil {
return value, err
}
data, err := decrypt(sDec, PASS_PHRASE)
if err != nil {
return value, err
}
return string(data), nil
}