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42 lines
1.5 KiB
Go
42 lines
1.5 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package utils
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import (
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"golang.org/x/crypto/bcrypt"
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)
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const maxInputSize = 72
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// truncateToMaxSize Make sure input is truncated to the maximum length crypto accepts. Crypto changed the behavior
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// from ignoring the extra input to returning an error, this truncation is necessary to maintain compatibility with
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// customers who have long passwords, or more commonly our recovery codes.
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func truncateToMaxSize(input []byte) []byte {
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if len(input) > maxInputSize {
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return input[:maxInputSize]
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}
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return input
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}
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// BcryptFromPassword delegates to bcrypt.GenerateFromPassword, but maintains the prior behavior of only hashing the
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// first 72 bytes. BCrypt as an algorithm can not hash inputs > 72 bytes.
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func BcryptFromPassword(password []byte, cost int) ([]byte, error) {
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return bcrypt.GenerateFromPassword(truncateToMaxSize(password), cost)
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}
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