restructure directories

core/utility/secrets.go

@@ -0,0 +1,88 @@
+// Copyright 2016 Documize Inc. <legal@documize.com>. All rights reserved.
+//
+// This software (Documize Community Edition) is licensed under 
+// GNU AGPL v3 http://www.gnu.org/licenses/agpl-3.0.en.html
+//
+// You can operate outside the AGPL restrictions by purchasing
+// Documize Enterprise Edition and obtaining a commercial license
+// by contacting <sales@documize.com>. 
+//
+// https://documize.com
+
+package utility
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"io"
+)
+
+var key = []byte("8456FHkQW1566etydT46jk39ghjfFhg4") // 32 bytes
+
+// MakeMD5 returns the MD5 hash of a given string, usually a password.
+/*
+func MakeMD5(password string) []byte {
+	hash := md5.New()
+	if _, err := io.WriteString(hash, password); err != nil {
+		log.Error("error in MakeMD5", err)
+	}
+	return hash.Sum(nil)
+}
+*/
+
+// MakeAES creates an AES encryption of of a given string,
+// using a hard-wired key value,
+// suitable for use as an authentication token.
+func MakeAES(secret string) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	b := EncodeBase64([]byte(secret))
+	ciphertext := make([]byte, aes.BlockSize+len(b))
+	iv := ciphertext[:aes.BlockSize]
+	if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+		return nil, err
+	}
+	cfb := cipher.NewCFBEncrypter(block, iv)
+	cfb.XORKeyStream(ciphertext[aes.BlockSize:], b)
+	return ciphertext, nil
+}
+
+// DecryptAES decrypts an AES encoded []byte,
+// using a hard-wired key value,
+// suitable for use when reading an authentication token.
+func DecryptAES(text []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, errors.New("aes.NewCipher failure: " + err.Error())
+	}
+	if len(text) < aes.BlockSize {
+		return nil, errors.New("ciphertext too short")
+	}
+	iv := text[:aes.BlockSize]
+	text = text[aes.BlockSize:]
+	cfb := cipher.NewCFBDecrypter(block, iv)
+	cfb.XORKeyStream(text, text)
+	return DecodeBase64(text)
+}
+
+// EncodeBase64 is a convenience function to encode using StdEncoding.
+func EncodeBase64(b []byte) []byte {
+	return []byte(base64.StdEncoding.EncodeToString(b))
+}
+
+// EncodeBase64AsString is a convenience function to encode using StdEncoding.
+/*
+func EncodeBase64AsString(b []byte) string {
+	return base64.StdEncoding.EncodeToString(b)
+}
+*/
+
+// DecodeBase64 is a convenience function to decode using StdEncoding.
+func DecodeBase64(b []byte) ([]byte, error) {
+	return base64.StdEncoding.DecodeString(string(b))
+}