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Pikirasa

Easy PKI public/private RSA key encryption using the OpenSSL extension.

What's up with the name?

Pikirasa is just "PKI RSA" with a few exta vowels thrown in. Also, I created this project late on a Friday night, so I just couldn't bring myself to name it anything serious.

What is this for?

Pikirasa is very lightweight wrapper around PHP's OpenSSL extension for encrypting and decrypting data with a known public/private key pair. It requires that you have the OpenSSL extension installed, and that your certificates have already been generated.

Pikirasa is not a general purpose or all-encompassing encryption library. If you need more encryption options or maximum system compatability, take a look at phpseclib.

Installation

Just fire up Composer!

composer require vlucas/pikirasa

Example Usage

All you need is the full path to your public and/or private key files:

$rsa = new Pikirasa\RSA('path/to/public.pem', 'path/to/private.pem');

$data = 'abc123';
$encrypted = $rsa->encrypt($data);
$decrypted = $rsa->decrypt($encrypted);
var_dump($decrypted); // 'abc123'

Under the hood, Pikirasa will make these paths file streams, and you may use any file stream directly instead :

$rsa = new Pikirasa\RSA('file:///absolute/path/to/public.pem', 'file://relative/path/to/private.pem');

$data = 'abc123';
$encrypted = $rsa->encrypt($data);
$decrypted = $rsa->decrypt($encrypted);
var_dump($decrypted); // 'abc123'

You can also use the string contents of your public and private keys :

$publicKey = '
-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7o9A47JuO3wgZ/lbOIOs
Xc6cVSiCMsrglvORM/54StFRvcrxMi7OjXD6FX5fQpUOQYZfIOFZZMs6kmNXk8xO
hgTmdMJcBWolQ85acfAdWpTpCW29YMvXNARUDb8uJKAApsISnttyCnbvp7zYMdQm
HiTG/+bYaegSXzV3YN+Ej+ZcocubUpLp8Rpzz+xmXep3BrjBycAE9z2IrrV2rlwg
TTxU/B8xmvMsToBQpAbe+Cv130tEHsyW4UL9KZY1M9R+UHFPPmORjBKxSZvjJ1mS
UbUYN6PmMry35wCaFCfQoyTDUxBfxTGYqjaveQv4sxx0uvoiLXHt9cAm5Q8KJ+8d
FwIDAQAB
-----END PUBLIC KEY-----
';

$privateKey = '
-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA7o9A47JuO3wgZ/lbOIOsXc6cVSiCMsrglvORM/54StFRvcrx
Mi7OjXD6FX5fQpUOQYZfIOFZZMs6kmNXk8xOhgTmdMJcBWolQ85acfAdWpTpCW29
YMvXNARUDb8uJKAApsISnttyCnbvp7zYMdQmHiTG/+bYaegSXzV3YN+Ej+Zcocub
UpLp8Rpzz+xmXep3BrjBycAE9z2IrrV2rlwgTTxU/B8xmvMsToBQpAbe+Cv130tE
HsyW4UL9KZY1M9R+UHFPPmORjBKxSZvjJ1mSUbUYN6PmMry35wCaFCfQoyTDUxBf
xTGYqjaveQv4sxx0uvoiLXHt9cAm5Q8KJ+8dFwIDAQABAoIBAHkWS3iHy/3zjjtY
TV4NL8NZqO5splGDuqXEMbKzenl3b8cnKHAxY/RVIQsh3tZb9CV8P/Lfj1Fi+nLt
a7mAXWcXO6aONMkmzI1zQ2NL3opoxTRc+GAWd0BW5hcoMBK1CD+ciHkLqAH5xsFc
UFxSc5qfTkb79GMlQZYD/Hk2WwHyj7hAkyxip4ye1EOnH5h8H7vIUjwp+H6Rmt5w
FTiVJbokhzwiczChUJVWgnowegL/qFV+yNfHGGKqVdIQfKdCsHR6jAuKCww5QniN
qDEi/M2Az0R4qfVmf38uMvOJTWaxp08JV4qRyNdh6hhbj+nY1EZ8haOiC7tjz2mJ
XqqKQfkCgYEA95yb5ezTBF4Pbr589OnU6VFdM88BCrKKvSWE8D1fzZZTsXur5k/x
cOwfio4RkmJwMnjuzZN6nvL5QddfcmPWQAoepHR8eA9yhIz57YWgrqE9ZXI8DgMy
SFuy5EkV5vudjDIr7kBXaGuUh3ErZfglyrV/rUfydGdTWyY8phMq/6MCgYEA9qQj
7kb5uyU8nrXoDqKPpy6ijEpVilgy4VR7RuB2vMh74wKI1QQYED+PxfcHe5RP8WGF
Bl+7VnmrGka4xJWeN7GKW4GRx5gRAzg139DXkqwPlXyM3ZR3pLd8wtbxTmJrcPby
A6uNRhGPpuyhDs5hx9z6HvLoCs+O0A9gDaChM/0CgYEAycRguNPpA2cOFkS8l+mu
p8y4MM5eX/Qq34QiNo0ccu8rFbXb1lmQOV7/OK0Znnn+SPKITRX+1mTRPZidWx4F
aLuWSpXtEvwrad1ijuzTiVk0KWUTkKuEHrgyJplzcnvX3nTHnWXqk9kN9+v83CN/
0BVji7TT2YyUvPKEeyOlZxcCgYABFm42Icf+JEblKEYyslLR2OnMlpNT/dmTlszI
XjsH0BaDxMIXtmHoyG7434L/74J+vQBaK9fmpLi1b/RmoYZGFplWl/atm6UPj5Ll
PsWElw+miBsS6xGv/0MklNARmWuB3wToMTx5P6CTit2W9CAIQpgzxLxzN8EYd8jj
pn6vfQKBgQCHkDnpoNZc2m1JksDiuiRjZORKMYz8he8seoUMPQ+iQze66XSRp5JL
oGZrU7JzCxuyoeA/4z36UN5WXmeS3bqh6SinrPQKt7rMkK1NQYcDUijPBMt0afO+
LH0HIC1HAtS6Wztd2Taoqwe5Xm75YW0elo4OEqiAfubAC85Ec4zfxw==
-----END RSA PRIVATE KEY-----
';

$rsa = new Pikirasa\RSA($publicKey, $privateKey);

$data = 'abc123';
$encrypted = $rsa->encrypt($data);
$decrypted = $rsa->decrypt($encrypted);
var_dump($decrypted); // 'abc123'

Creating keys

Don't have key files already? No problem - you can simply create new ones :

$rsa = new Pikirasa\RSA('path/to/nonexistent_public.pem', 'path/to/nonexistent_private.pem');
$rsa->create();  // creates new keys in the new key files

$data = 'abc123';
$encrypted = $rsa->encrypt($data);
$decrypted = $rsa->decrypt($encrypted);
var_dump($decrypted); // 'abc123'

Need a key size other than the default of 2048 bits? Simply pass the size you need as the first parameter of $rsa->create().

Pikirasa won't overwrite existing key files unless you pass true to the second parameter of $rsa->create().

If you prefer to work with key strings over key files, you can create keys that way, too :

$rsa = new Pikirasa\RSA(null, null);
$rsa->create();  // creates new keys as strings

$data = 'abc123';
$encrypted = $rsa->encrypt($data);
$decrypted = $rsa->decrypt($encrypted);
var_dump($decrypted);
          // 'abc123'
var_dump($rsa->getPublicKeyFile());
          // -----BEGIN PUBLIC KEY-----
          // MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7o9A47JuO3wgZ/lbOIOs
          // Xc6cVSiCMsrglvORM/54StFRvcrxMi7OjXD6FX5fQpUOQYZfIOFZZMs6kmNXk8xO
          // hgTmdMJcBWolQ85acfAdWpTpCW29YMvXNARUDb8uJKAApsISnttyCnbvp7zYMdQm
          // HiTG/+bYaegSXzV3YN+Ej+ZcocubUpLp8Rpzz+xmXep3BrjBycAE9z2IrrV2rlwg
          // TTxU/B8xmvMsToBQpAbe+Cv130tEHsyW4UL9KZY1M9R+UHFPPmORjBKxSZvjJ1mS
          // UbUYN6PmMry35wCaFCfQoyTDUxBfxTGYqjaveQv4sxx0uvoiLXHt9cAm5Q8KJ+8d
          // FwIDAQAB
          // -----END PUBLIC KEY-----
var_dump($rsa->getPrivateKeyFile());
          // -----BEGIN RSA PRIVATE KEY-----
          // MIIEpAIBAAKCAQEA7o9A47JuO3wgZ/lbOIOsXc6cVSiCMsrglvORM/54StFRvcrx
          // Mi7OjXD6FX5fQpUOQYZfIOFZZMs6kmNXk8xOhgTmdMJcBWolQ85acfAdWpTpCW29
          // YMvXNARUDb8uJKAApsISnttyCnbvp7zYMdQmHiTG/+bYaegSXzV3YN+Ej+Zcocub
          // UpLp8Rpzz+xmXep3BrjBycAE9z2IrrV2rlwgTTxU/B8xmvMsToBQpAbe+Cv130tE
          // HsyW4UL9KZY1M9R+UHFPPmORjBKxSZvjJ1mSUbUYN6PmMry35wCaFCfQoyTDUxBf
          // xTGYqjaveQv4sxx0uvoiLXHt9cAm5Q8KJ+8dFwIDAQABAoIBAHkWS3iHy/3zjjtY
          // TV4NL8NZqO5splGDuqXEMbKzenl3b8cnKHAxY/RVIQsh3tZb9CV8P/Lfj1Fi+nLt
          // a7mAXWcXO6aONMkmzI1zQ2NL3opoxTRc+GAWd0BW5hcoMBK1CD+ciHkLqAH5xsFc
          // UFxSc5qfTkb79GMlQZYD/Hk2WwHyj7hAkyxip4ye1EOnH5h8H7vIUjwp+H6Rmt5w
          // FTiVJbokhzwiczChUJVWgnowegL/qFV+yNfHGGKqVdIQfKdCsHR6jAuKCww5QniN
          // qDEi/M2Az0R4qfVmf38uMvOJTWaxp08JV4qRyNdh6hhbj+nY1EZ8haOiC7tjz2mJ
          // XqqKQfkCgYEA95yb5ezTBF4Pbr589OnU6VFdM88BCrKKvSWE8D1fzZZTsXur5k/x
          // cOwfio4RkmJwMnjuzZN6nvL5QddfcmPWQAoepHR8eA9yhIz57YWgrqE9ZXI8DgMy
          // SFuy5EkV5vudjDIr7kBXaGuUh3ErZfglyrV/rUfydGdTWyY8phMq/6MCgYEA9qQj
          // 7kb5uyU8nrXoDqKPpy6ijEpVilgy4VR7RuB2vMh74wKI1QQYED+PxfcHe5RP8WGF
          // Bl+7VnmrGka4xJWeN7GKW4GRx5gRAzg139DXkqwPlXyM3ZR3pLd8wtbxTmJrcPby
          // A6uNRhGPpuyhDs5hx9z6HvLoCs+O0A9gDaChM/0CgYEAycRguNPpA2cOFkS8l+mu
          // p8y4MM5eX/Qq34QiNo0ccu8rFbXb1lmQOV7/OK0Znnn+SPKITRX+1mTRPZidWx4F
          // aLuWSpXtEvwrad1ijuzTiVk0KWUTkKuEHrgyJplzcnvX3nTHnWXqk9kN9+v83CN/
          // 0BVji7TT2YyUvPKEeyOlZxcCgYABFm42Icf+JEblKEYyslLR2OnMlpNT/dmTlszI
          // XjsH0BaDxMIXtmHoyG7434L/74J+vQBaK9fmpLi1b/RmoYZGFplWl/atm6UPj5Ll
          // PsWElw+miBsS6xGv/0MklNARmWuB3wToMTx5P6CTit2W9CAIQpgzxLxzN8EYd8jj
          // pn6vfQKBgQCHkDnpoNZc2m1JksDiuiRjZORKMYz8he8seoUMPQ+iQze66XSRp5JL
          // oGZrU7JzCxuyoeA/4z36UN5WXmeS3bqh6SinrPQKt7rMkK1NQYcDUijPBMt0afO+
          // LH0HIC1HAtS6Wztd2Taoqwe5Xm75YW0elo4OEqiAfubAC85Ec4zfxw==
          // -----END RSA PRIVATE KEY-----

Using Keys with a Passphrase

The Pikirasa\RSA class constructor accepts an optional 3rd parameter if your private key is protected with a password.

$rsa = new Pikirasa\RSA($publicKey, $privateKey, 'certificate_password');

$data = 'abc123';
$encrypted = $rsa->encrypt($data);
$decrypted = $rsa->decrypt($encrypted);
var_dump($decrypted); // 'abc123'

This approach also works when creating new keys that should be password protected :

$rsa = new Pikirasa\RSA($publicKey, $privateKey, 'certificate_password');
$rsa->create(); // creates new keys, with the private key password-protected

$data = 'abc123';
$encrypted = $rsa->encrypt($data);
$decrypted = $rsa->decrypt($encrypted);
var_dump($decrypted); // 'abc123'

$rsa2 = new Pikirasa\RSA($publicKey, $privateKey);
$decrypted = $rsa2->decrypt($encrypted); // Throws `Pikirasa\Exception` for bad/missing password

Working with base64-encoded strings

A common pattern if you want to deal with plain strings rather than binary data is to encode encryped data with base64. If you need to do that, both encrypt and decrypt have a base64 counterpart you can use :

$rsa = new Pikirasa\RSA($publicKey, $privateKey);

$data = 'abc123';
$encrypted = $rsa->base64Encrypt($data);
$decrypted = $rsa->base64Decrypt($encrypted);
var_dump($decrypted); // 'abc123'