33 lines
760 B
Go
33 lines
760 B
Go
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package utils
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import (
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"crypto/sha256"
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b64 "encoding/base64"
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"math/rand"
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"strings"
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"time"
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)
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const (
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length = 32
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)
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// GenerateCodeChallenge creates PKCE-Code-Challenge
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// and returns the verifier and challenge
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func GenerateCodeChallenge() (string, string) {
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// Generate Verifier
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randGenerator := rand.New(rand.NewSource(time.Now().UnixNano()))
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randomBytes := make([]byte, length)
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for i := 0; i < length; i++ {
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randomBytes[i] = byte(randGenerator.Intn(255))
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}
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verifier := strings.Trim(b64.URLEncoding.EncodeToString(randomBytes), "=")
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// Generate Challenge
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rawChallenge := sha256.New()
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rawChallenge.Write([]byte(verifier))
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challenge := strings.Trim(b64.URLEncoding.EncodeToString(rawChallenge.Sum(nil)), "=")
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return verifier, challenge
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}
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