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77 lines
2.7 KiB
Go
77 lines
2.7 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package hash
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// DefaultHashAlgorithmName represents the default value of PASSWORD_HASH_ALGO
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// configured in app.ini.
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//
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// It is NOT the same and does NOT map to the defaultEmptyHashAlgorithmSpecification.
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//
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// It will be dealiased as per aliasAlgorithmNames whereas
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// defaultEmptyHashAlgorithmSpecification does not undergo dealiasing.
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const DefaultHashAlgorithmName = "pbkdf2_hi"
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var DefaultHashAlgorithm *PasswordHashAlgorithm
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// aliasAlgorithNames provides a mapping between the value of PASSWORD_HASH_ALGO
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// configured in the app.ini and the parameters used within the hashers internally.
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//
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// If it is necessary to change the default parameters for any hasher in future you
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// should change these values and not those in argon2.go etc.
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var aliasAlgorithmNames = map[string]string{
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"argon2": "argon2$2$65536$8$50",
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"bcrypt": "bcrypt$10",
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"scrypt": "scrypt$65536$16$2$50",
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"pbkdf2": "pbkdf2_v2", // pbkdf2 should default to pbkdf2_v2
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"pbkdf2_v1": "pbkdf2$10000$50",
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// The latest PBKDF2 password algorithm is used as the default since it doesn't
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// use a lot of memory and is safer to use on less powerful devices.
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"pbkdf2_v2": "pbkdf2$50000$50",
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// The pbkdf2_hi password algorithm is offered as a stronger alternative to the
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// slightly improved pbkdf2_v2 algorithm
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"pbkdf2_hi": "pbkdf2$320000$50",
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}
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var RecommendedHashAlgorithms = []string{
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"pbkdf2",
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"argon2",
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"bcrypt",
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"scrypt",
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"pbkdf2_hi",
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}
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// hashAlgorithmToSpec converts an algorithm name or a specification to a full algorithm specification
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func hashAlgorithmToSpec(algorithmName string) string {
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if algorithmName == "" {
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algorithmName = DefaultHashAlgorithmName
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}
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alias, has := aliasAlgorithmNames[algorithmName]
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for has {
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algorithmName = alias
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alias, has = aliasAlgorithmNames[algorithmName]
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}
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return algorithmName
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}
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// SetDefaultPasswordHashAlgorithm will take a provided algorithmName and de-alias it to
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// a complete algorithm specification.
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func SetDefaultPasswordHashAlgorithm(algorithmName string) (string, *PasswordHashAlgorithm) {
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algoSpec := hashAlgorithmToSpec(algorithmName)
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// now we get a full specification, e.g. pbkdf2$50000$50 rather than pbdkf2
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DefaultHashAlgorithm = Parse(algoSpec)
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return algoSpec, DefaultHashAlgorithm
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}
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// ConfigHashAlgorithm will try to find a "recommended algorithm name" defined by RecommendedHashAlgorithms for config
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// This function is not fast and is only used for the installation page
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func ConfigHashAlgorithm(algorithm string) string {
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algorithm = hashAlgorithmToSpec(algorithm)
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for _, recommAlgo := range RecommendedHashAlgorithms {
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if algorithm == hashAlgorithmToSpec(recommAlgo) {
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return recommAlgo
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}
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}
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return algorithm
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}
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