spring boot - BCryptPasswordEncoder affects startup time of server -


why strength of bcryptpasswordencoder affect startup time of server? there no hashes generated @ startup, i'm wondering why have effect on startup.

of course, understand checking whether password matches takes time, @ start strange.

code looks this:

@bean public bcryptpasswordencoder passwordencoder() {     return new bcryptpasswordencoder(17); // affects startup time tremendously }  @autowired bcryptpasswordencoder bcryptencoder;  @autowired customuserdetailsservice userdetailsservice;  @override protected void configure(authenticationmanagerbuilder auth) throws exception {      auth.userdetailsservice(userdetailsservice)              .passwordencoder(bcryptencoder); }

the constructor of bcryptpasswordencoder not doing on startup depending on password strength :

public bcryptpasswordencoder(int strength) {     this(strength, null); }  public bcryptpasswordencoder(int strength, securerandom random) {     if (strength != -1 && (strength < bcrypt.min_log_rounds || strength > bcrypt.max_log_rounds)) {         throw new illegalargumentexception("bad strength");     }     this.strength = strength;     this.random = random; }

having seen this, dont think changing strength parameter can increase startup time described.

but when use encrypter, 'strength' sure impact performance. may encrypting many passwords somewhere @ startup ?


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