composer get installation error for phpseclib - php

Question

I am trying to install phpseclib in Laravel for RSA. I have tried following command.
composer require phpseclib/phpseclib
But I do get following error.
Using version ^2.0 for phpseclib/phpseclib
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
The requested package symfony/translation (locked at v4.4.7, required as 4.3.8) is satisfiable by symfony/translation[v4.4.7] but these conflict with your requirements or minimum-stability.
Problem 2
Conclusion: remove symfony/cache-contracts v2.0.1
Conclusion: don't install symfony/cache-contracts v2.0.1
don't install symfony/contracts v1.1.6|don't install symfony/cache-contracts v2.0.1
don't install symfony/contracts v1.1.7|don't install symfony/cache-contracts v2.0.1
don't install symfony/contracts v1.1.8|don't install symfony/cache-contracts v2.0.1
Installation request for symfony/cache-contracts (locked at v2.0.1) -> satisfiable by symfony/cache-contracts[v2.0.1].
Installation request for symfony/translation 4.3.8 -> satisfiable by symfony/translation[v4.3.8].
Conclusion: don't install symfony/translation-contracts v2.0.1|install symfony/contracts v1.1.6|install symfony/contracts v1.1.7|install symfony/contracts v1.1.8
Conclusion: remove symfony/translation-contracts v2.0.1|install symfony/contracts v1.1.6|install symfony/contracts v1.1.7|install symfony/contracts v1.1.8
symfony/translation v4.3.8 requires symfony/translation-contracts ^1.1.6 -> satisfiable by symfony/contracts[v1.1.6, v1.1.7, v1.1.8], symfony/translation-contracts[v1.1.6, v1.1.7, v1.1.9].
Can only install one of: symfony/translation-contracts[v1.1.6, v2.0.1].
Can only install one of: symfony/translation-contracts[v1.1.7, v2.0.1].
Can only install one of: symfony/translation-contracts[v1.1.9, v2.0.1].
Installation request for symfony/translation-contracts (locked at v2.0.1) -> satisfiable by symfony/translation-contracts[v2.0.1].
Installation failed, reverting ./composer.json to its original content.
Given below is the content of composer.json file.
"name": "laravel/laravel",
"type": "project",
"version": "v1.2.0",
"description": "The Laravel Framework.",
"keywords": [
"framework",
"laravel"
],
"license": "MIT",
"require": {
"php": "^7.2",
"ext-json": "*",
"berkayk/onesignal-laravel": "^1.0",
"doctrine/dbal": "~2.3",
"egulias/email-validator": "^2.1",
"fideloper/proxy": "^4.0",
"infyomlabs/coreui-templates": "6.0.x-dev",
"infyomlabs/laravel-generator": "6.0.x-dev",
"intervention/image": "^2.5",
"laminas/laminas-diactoros": "^2.2",
"laravel/framework": "^6.0",
"laravel/passport": "^7.5",
"laravel/socialite": "^4.3",
"laravel/telescope": "^2.1",
"laravel/tinker": "^1.0",
"laravelcollective/html": "^6.0",
"league/flysystem-aws-s3-v3": "^1.0",
"phpseclib/phpseclib": "^2.0",
"pusher/pusher-php-server": "~4.0",
"spatie/laravel-analytics": "^3.9",
"spatie/laravel-permission": "^3.2",
"symfony/translation": "4.3.8",
"yajra/laravel-datatables-oracle": "~9.0"
},
"require-dev": {
"barryvdh/laravel-debugbar": "^3.2",
"barryvdh/laravel-ide-helper": "^2.6",
"filp/whoops": "^2.0",
"fzaninotto/faker": "^1.4",
"mockery/mockery": "^1.0",
"nunomaduro/collision": "^3.0",
"phpunit/phpunit": "^8.0"
},
"config": {
"optimize-autoloader": true,
"preferred-install": "dist",
"sort-packages": true
},
"extra": {
"laravel": {
"dont-discover": []
}
},
"autoload": {
"files": ["app/helpers.php"],
"psr-4": {
"App\\": "app/"
},
"classmap": [
"database/seeds",
"database/factories"
]
},
"autoload-dev": {
"psr-4": {
"Tests\\": "tests/"
}
},
"minimum-stability": "dev",
"prefer-stable": true,
"scripts": {
"post-autoload-dump": [
"Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
"#php artisan package:discover --ansi"
],
"post-root-package-install": [
"#php -r \"file_exists('.env') || copy('.env.example', '.env');\""
],
"post-create-project-cmd": [
"#php artisan key:generate --ansi"
]
}
I have tried for couple of hours to search solution on google and stack overflow but didn't get any success.

Answer 1

Are you sure the given error message is related to phpseclib/phpseclib? That package does not use any Symfony dependencies. And, according to the dependency list of laravel/passport, that library is already installed.
I would assume that you have installed another package in the meantime by adding it to composer.json manually. What happens if you call composer install - does it inform you that the installation is not possible, or that the lock file is out of sync?
You could resolve this by removing symfony/translation from your composer.json, run composer update, and try to reinstall this package afterwards. Because somehow symfony/translation-contracts got installed in v2.0.1 (which is only compatible with Symfony 4.4 or later), while your configuration explicitly tries to load symfony/translation from Symfony 4.3