35c3553870
Migrate from U2F to Webauthn Co-authored-by: Andrew Thornton <art27@cantab.net> Co-authored-by: 6543 <6543@obermui.de> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
28 lines
679 B
Go
Vendored
28 lines
679 B
Go
Vendored
package protocol
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import (
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"crypto/rand"
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"encoding/base64"
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)
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// ChallengeLength - Length of bytes to generate for a challenge
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const ChallengeLength = 32
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// Challenge that should be signed and returned by the authenticator
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type Challenge URLEncodedBase64
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// Create a new challenge to be sent to the authenticator. The spec recommends using
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// at least 16 bytes with 100 bits of entropy. We use 32 bytes.
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func CreateChallenge() (Challenge, error) {
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challenge := make([]byte, ChallengeLength)
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_, err := rand.Read(challenge)
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if err != nil {
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return nil, err
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}
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return challenge, nil
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}
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func (c Challenge) String() string {
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return base64.RawURLEncoding.EncodeToString(c)
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}
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