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28 lines
704 B
Go
28 lines
704 B
Go
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// Copyright (c) 2018 Shivaram Lingamneni
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package irc
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import (
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"encoding/base64"
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"errors"
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)
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var (
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errInvalidPasswordHash = errors.New("invalid password hash")
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)
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// Decode a hashed passphrase as it would appear in a config file,
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// retaining compatibility with old versions of `oragono genpasswd`
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// that used to apply a redundant layer of base64
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func decodeLegacyPasswordHash(hash string) ([]byte, error) {
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// a correctly formatted bcrypt hash is 60 bytes of printable ASCII
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if len(hash) == 80 {
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// double-base64, remove the outer layer:
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return base64.StdEncoding.DecodeString(hash)
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} else if len(hash) == 60 {
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return []byte(hash), nil
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} else {
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return nil, errInvalidPasswordHash
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}
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}
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