summaryrefslogtreecommitdiffstats
path: root/lib/srp.go
diff options
context:
space:
mode:
Diffstat (limited to 'lib/srp.go')
-rw-r--r--lib/srp.go51
1 files changed, 51 insertions, 0 deletions
diff --git a/lib/srp.go b/lib/srp.go
index 491565c..05b61ab 100644
--- a/lib/srp.go
+++ b/lib/srp.go
@@ -134,6 +134,42 @@ func NewSRPUser(n, g, k, ident, pass string) (*SRPUser, error) {
return user, nil
}
+func (u *SRPUser) EphemeralKeyGen() {
+ for {
+ u.b = big.NewInt(RandomInt(1, 10000000))
+ if u.b.Cmp(big.NewInt(0)) == 1 {
+ break
+ }
+ }
+}
+
+func (u *SRPUser) EphemeralKeyPub() (*big.Int, error) {
+ if u.k == nil || u.k.Cmp(big.NewInt(0)) != 1 {
+ return nil, CPError{"k is not initialized"}
+ }
+ if u.v == nil || u.v.Cmp(big.NewInt(0)) != 1 {
+ return nil, CPError{"v is not initialized"}
+ }
+ if u.g == nil || u.g.Cmp(big.NewInt(0)) != 1 {
+ return nil, CPError{"g is not initialized"}
+ }
+ if u.b == nil || u.b.Cmp(big.NewInt(0)) != 1 {
+ return nil, CPError{"b is not initialized"}
+ }
+
+ kv := new(big.Int)
+ kv.Mul(u.k, u.v)
+
+ gb := new(big.Int)
+ gb.Exp(u.g, u.b, u.n)
+
+ // pub is 'B'
+ pub := new(big.Int)
+ pub.Add(kv, gb)
+
+ return pub, nil
+}
+
func NewSRPClientSession(n, g, k, ident string) (*SRPClientSession, error) {
var ok bool
@@ -161,3 +197,18 @@ func NewSRPClientSession(n, g, k, ident string) (*SRPClientSession, error) {
return session, nil
}
+
+func (s *SRPClientSession) EphemeralKeyPub() (*big.Int, error) {
+ if s.g == nil || s.g.Cmp(big.NewInt(0)) != 1 {
+ return nil, CPError{"g is not initialized"}
+ }
+ if s.a == nil || s.a.Cmp(big.NewInt(0)) != 1 {
+ return nil, CPError{"a is not initialized"}
+ }
+
+ // pub is 'A'
+ pub := new(big.Int)
+ pub.Exp(s.g, s.a, s.n)
+
+ return pub, nil
+}