diff --git a/client/methods.go b/client/methods.go
index e81e251..08cc92a 100644
--- a/client/methods.go
+++ b/client/methods.go
@@ -1,5 +1,12 @@
 package client
 
+import (
+	"crypto/sha1"
+	"fmt"
+	"time"
+)
+import "github.com/pquerna/otp/totp"
+
 func NewSession(publicHash string, privateHash string) (c *CreateSessionStruct) {
 	c.PrivateHash = privateHash
 	c.PublicHash = publicHash
@@ -8,7 +15,13 @@ func NewSession(publicHash string, privateHash string) (c *CreateSessionStruct)
 	return c
 }
 
-func (c *CreateSessionStruct) GetChallengeAnswer(secret string) (string, error) {
-	// pvt_hash := c.PrivateHash
-	return "", nil
+func (c *CreateSessionStruct) GetChallengeAnswer(challenge string) (string, error) {
+	totpCode, err := totp.GenerateCode(challenge, time.Now())
+	if err != nil {
+		return "", nil
+	}
+
+	hash := sha1.New()
+	hash.Write([]byte(totpCode + c.PrivateHash))
+	return fmt.Sprintf("%x", hash.Sum(nil)), nil
 }
diff --git a/go.mod b/go.mod
index 7d3633b..85e558d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,8 @@
 module github.com/Intellivoid/Socialvoid-Go
 
 go 1.17
+
+require (
+	github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc // indirect
+	github.com/pquerna/otp v1.3.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..27bc2b8
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,11 @@
+github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc h1:biVzkmvwrH8WK8raXaxBx6fRVTlJILwEwQGL1I/ByEI=
+github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/pquerna/otp v1.3.0 h1:oJV/SkzR33anKXwQU3Of42rL4wbrffP4uvUf1SvS5Xs=
+github.com/pquerna/otp v1.3.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=