magento2: Password hash should not rely on system dependant constant

Preconditions (*)

1. Magento 2.3.3
2. PHP 7.2.22

Steps to reproduce (*)

1. Fresh Magento install
2. Create some admin and customer accounts
3. Make some system or hardware upgrade on server compiling and running PHP which change Sodium predefined constants https://www.php.net/manual/en/sodium.constants.php
4. Try to login with any account

Expected result (*)

1. Any admin or customer could login with their current password

Actual result (*)

1. Admin and customer cannot login with their current password and need to use forgotten password function to get a new one

Temporary workaround

Get constant value from the old server

$ php -r 'echo SODIUM_CRYPTO_SIGN_SEEDBYTES."\n";'
32
$ php -r 'echo SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE."\n";'
4
$ php -r 'echo SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE."\n";'
33554432

Check if they differ on the new server

$ php -r 'echo SODIUM_CRYPTO_SIGN_SEEDBYTES."\n";'
32
$ php -r 'echo SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE."\n";'
2
$ php -r 'echo SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE."\n";'
67108864

On the new server, replace constant by the value from the old server into the sodium_crypto_pwhash function

https://github.com/magento/magento2/blob/2.4-develop/lib/internal/Magento/Framework/Encryption/Encryptor.php#L585

User could login again without need to reset their password.

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.