Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

internal/auth/password.go

@@ -0,0 +1,16 @@
+package auth
+
+import "golang.org/x/crypto/bcrypt"
+
+const bcryptCost = 12
+
+// HashPassword returns the bcrypt hash of a plaintext password.
+func HashPassword(plaintext string) (string, error) {
+	b, err := bcrypt.GenerateFromPassword([]byte(plaintext), bcryptCost)
+	return string(b), err
+}
+
+// CheckPassword returns nil if plaintext matches the stored hash.
+func CheckPassword(hash, plaintext string) error {
+	return bcrypt.CompareHashAndPassword([]byte(hash), []byte(plaintext))
+}