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