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- package protocol
-
- import (
- "crypto/rand"
- "encoding/base64"
- )
-
- // ChallengeLength - Length of bytes to generate for a challenge
- const ChallengeLength = 32
-
- // Challenge that should be signed and returned by the authenticator
- type Challenge URLEncodedBase64
-
- // Create a new challenge to be sent to the authenticator. The spec recommends using
- // at least 16 bytes with 100 bits of entropy. We use 32 bytes.
- func CreateChallenge() (Challenge, error) {
- challenge := make([]byte, ChallengeLength)
- _, err := rand.Read(challenge)
- if err != nil {
- return nil, err
- }
- return challenge, nil
- }
-
- func (c Challenge) String() string {
- return base64.RawURLEncoding.EncodeToString(c)
- }
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