SshKey

This library allows you to work with public and private keys in PHP.

Read keys both from a file and from other sources like a database
Convert between key formats
Get a public keys fingerprint
Generate new key-pairs

It depends on phpseclib for all of the key manipulation.

Installation

Require the package in your composer.json and then run composer update

"require": {
    ...
    "codeaken/sshkey": "1.*"
    ...
},

Usage

These examples makes the following assumptions:

The library is autoloaded, for example by having included vendor/autoload.php somewhere in your project
You have a a key-pair in your current directory called id_rsa (private) and id_rsa.pub (public). The private key is not encrypted.
An encrypted private key in your current directory called id_encrypted_rsa protected by the password abc123

Read a key from a file

<?php

// Read in the public and private keys
$publicKey = SshPublicKey::fromFile('id_rsa.pub');
$privateKey = SshPrivateKey::fromFile('id_rsa');
$encryptedPrivateKey = SshPrivateKey::fromFile('id_encrypted_rsa', 'abc123');

// Try to read a key that does not exists; will throw a FileNotFoundException
try {
    $missingKey = SshPublicKey::fromFile('nosuchkey.pub');
}
catch (Codeaken\SshKey\Exception\FileNotFoundException $e)
{
    echo 'Could not find the key';
}

// Try to read an encrypted private key using the wrong password; will throw a
// LoadKeyException
try {
    $encryptedKey = SshPrivateKey::fromFile('id_encrypted_rsa', 'wrongpass');
}
catch (Codeaken\SshKey\Exception\LoadKeyException $e)
{
    echo 'Could not decrypt the private key';
}

Read a key from a non file source

<?php

// In this case we will read the key data from a file for simplicity but it
// could come from a database or some other source

$publicKeyData = file_get_contents('id_rsa.pub');
$publicKey = new SshPublicKey($publicKeyData);

$encryptedPrivateKeyData = file_get_contents('id_encrypted_rsa');
$privateKey = new SshPrivateKey($encryptedPrivateKeyData, 'abc123');

Get a public keys fingerprint and comment

<?php

$publicKey = SshPublicKey::fromFile('id_rsa.pub');

echo $publicKey->getFingerprint();
echo $publicKey->getComment();

Generate a new keypair

<?php

// 1024 bits and no passphrase
$keyPair1 = SshKeyPair::generate(1024);

// 2048 bits and a passphrase of abc123
$keyPair2 = SshKeyPair::generate(2048, 'abc123');

echo $keyPair2->getPrivateKey()->getKeyData(SshKey::FORMAT_PKCS8);
echo $keyPair2->getPublicKey()->getKeyData(SshKey::FORMAT_OPENSSH);

Save a key to a file

<?php

$keyPair = SshKeyPair::generate();

$publicKey  = $keyPair->getPublicKey();
$privateKey = $keyPair->getPrivateKey();

file_put_contents('id_new_rsa.pub', $publicKey->getKeyData(SshKey::FORMAT_OPENSSH));
file_put_contents('id_new_rsa', $privateKey->getKeyData(SshKey::FORMAT_PKCS8));

License

SshKey is licensed under the MIT License.