44 lines
1.4 KiB
Go
44 lines
1.4 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package oauth2server
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import (
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"crypto/sha256"
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"crypto/subtle"
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"encoding/base64"
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"go.probo.inc/probo/pkg/coredata"
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)
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func ValidateCodeChallenge(verifier, challenge string, method coredata.OAuth2CodeChallengeMethod) bool {
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if verifier == "" || challenge == "" {
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return false
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}
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switch method {
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case coredata.OAuth2CodeChallengeMethodS256:
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return validateS256(verifier, challenge)
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default:
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return false
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}
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}
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func validateS256(verifier, challenge string) bool {
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h := sha256.Sum256([]byte(verifier))
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computed := base64.RawURLEncoding.EncodeToString(h[:])
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return subtle.ConstantTimeCompare([]byte(computed), []byte(challenge)) == 1
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}
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