Imports github.com/boombuler/barcode github.com/boombuler/barcode/qr github.com/colt3k/utils/crypt github.com/colt3k/utils/crypt/encrypt/argon2id Standard library imports bytes crypto/hmac crypto/rand crypto/sha1 encoding/base32 encoding/base64 encoding/binary fmt image image/png io math/big net/http regexp strings time