initial import of sources

xauth.go

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2022 Oleg Borodin  <borodin@unix7.org>
+ */
+
+package dsrpc
+
+import (
+    "encoding/json"
+    "bytes"
+    "math/rand"
+    "time"
+    "crypto/sha256"
+)
+
+func init() {
+    rand.Seed(time.Now().UnixNano())
+}
+
+type Auth struct {
+    Ident   []byte      `json:"ident,omitempty"`
+    Salt    []byte      `json:"salt,omitempty"`
+    Hash    []byte      `json:"hash,omitempty"`
+}
+
+func NewAuth() *Auth {
+    return &Auth{}
+}
+
+func (this *Auth) JSON() []byte {
+    jBytes, _ := json.Marshal(this)
+    return jBytes
+}
+
+func CreateAuth(ident, pass []byte) *Auth {
+    salt := CreateSalt()
+    hash := CreateHash(ident, pass, salt)
+    auth := &Auth{}
+    auth.Ident = ident
+    auth.Salt = salt
+    auth.Hash = hash
+    return auth
+}
+
+func CreateSalt() []byte {
+    const saltSize = 16
+    randBytes := make([]byte, saltSize)
+    rand.Read(randBytes)
+    return randBytes
+}
+
+func CreateHash(ident, pass, salt []byte) []byte {
+    vec := make([]byte, 0, len(ident) + len(salt) + len(pass))
+    vec = append(vec, ident...)
+    vec = append(vec, salt...)
+    vec = append(vec, pass...)
+    hasher := sha256.New()
+    hash := hasher.Sum(vec)
+    return hash
+}
+
+func CheckHash(ident, pass, reqSalt, reqHash []byte) bool {
+    localHash := CreateHash(ident, pass, reqSalt)
+    return bytes.Equal(reqHash, localHash)
+}