Imports code.google.com/p/go.crypto/scrypt code.google.com/p/rsc/qr github.com/dustyburwell/ed25519 github.com/kalaspuffar/base64url Standard library imports io math/rand net net/http strings time bytes crypto/aes crypto/cipher crypto/hmac crypto/rand crypto/sha256 crypto/subtle encoding/base64 encoding/binary errors fmt