PHP RSA encryption using private key and PKCS1

Question

I need to encrypt a string using RSA, PKCS1, private key and PHP. I could not even find a terminal command that can be used with exec (). Does anyone know how to do this?

Thank!

Answer 1

Try phpseclib, a pure PHP RSA implementation :

<?php
include('Crypt/RSA.php');

$rsa = new Crypt_RSA();
//extract($rsa->createKey());

$plaintext = 'terrafrost';

$rsa->loadKey($privatekey);
$rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);
$ciphertext = $rsa->encrypt($plaintext);

echo $plaintext;
?>

: phpseclib, , RSA. . .

Answer 2

openssl aes-256-cbc -a -salt -in inputfile.txt -out encryptedfile.txt -pass pass:thepassword
openssl aes-256-cbc -d -a -in encryptedfile.txt -out decryptedfile.txt 

.

Answer 3

php_openssl, , , . php, .

. Linux, Mac, Cygwin Windows Git BASH.

512- rsa. . .

openssl genrsa -des3 -out private.pem 512

. .

openssl rsa -in private.pem -pubout -out public.pem

PHP /

Please note that I have enabled encryption and decryption using public and private keys. You just want to choose one of them for implementation, for example, encrypt using private and decrypt using public.

<?php
$privateKeyPassphrase = "mypassword";
$sensitiveData = "This is the data that we want to encrypt.";

/*
// Load the keys from a file (as you would most likely do in a production environment)
$priv_key_file_name = realpath("private.pem");
$publ_key_file_name = realpath("public.pem");

// Note: This function needs an array of parameters!
$privateKey = openssl_pkey_get_private(array("file://$priv_key_file_name", $privateKeyPassphrase));
$publicKey = openssl_pkey_get_public(array("file://$publ_key_file_name", $privateKeyPassphrase));
*/

// Get keys from a string so that this example can be run without the need for extra files
$privateKeyString = <<<PK
-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,D21679087FE8490E

hXTtfXC4qYNoE9hySVwPD+Mwhb7RiCae589Z952Z+ucz9i8j+1MO4Sx2nOMCH5Eg
uotMSr3FipJ/Bqbh66AqqYK3PG7NFYA41f/7xrTA6gwq6MDjmAy6z8TW+NE3OCpF
n+9zPzT15wcNm4U4ZRpEO+Fi8cYTLu0LlX+k8Djrd+CuS6wX4p8SgpAplDrnAiAH
z3sJtf2+M67yTNT7v/hIJmkebCwES43pTlNrxluJpD7HBl4BGmFWFI+MJ/gPuFn6
etQjDpzgep0Wn4FKi34IkDQ9kM4/9tWy0Fhf8ytdg0NZshMt/PWRPrNrs+2qLoJu
1rHc0rtKVvALQOKU+SbxaYVBlEzelxB0XJ2uQMSIs46vHZiUG3Q2JBmlxRshHQse
8n9CAYmwm++cPmXq06rVMclCJR0pDlOzGQvIgmo4eiY=
-----END RSA PRIVATE KEY-----
PK;

$publicKeyString = <<<PK
-----BEGIN PUBLIC KEY-----
MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKcNEHgry/zIFpKdKz2E/ksoDkBn00K7
v2CxB2kHMWjAxgaFPCYs/8gHclSkcJYARKqvU/0Gsc0mrrPtCs5CytcCAwEAAQ==
-----END PUBLIC KEY-----
PK;

// Load private key
$privateKey = openssl_pkey_get_private(array($privateKeyString, $privateKeyPassphrase));

// Load public key
$publicKey = openssl_pkey_get_public(array($publicKeyString, $privateKeyPassphrase));

if (!$privateKey) {
    echo "Private key NOT OK\n";
}

if (!$publicKey) {
    echo "Public key NOT OK\n";
}

if (!openssl_private_encrypt($sensitiveData, $encryptedWithPrivate, $privateKey)) {
    echo "Error encrypting with private key\n";
}

if (!openssl_public_encrypt($sensitiveData, $encryptedWithPublic, $publicKey)) {
    echo "Error encrypting with public key\n";
}

if (!openssl_private_decrypt($encryptedWithPublic, $decryptedWithPrivateFromPublic, $privateKey)) {
    echo "Error decrypting with private key what was encrypted with public key\n";
}

if (!openssl_public_decrypt($encryptedWithPrivate, $decryptedWithPublicFromPrivate, $publicKey)) {
    echo "Error decrypting with public key what was encrypted with private key\n";
}

echo "Encrypted with public key: " . base64_encode($encryptedWithPublic) . "\n"; // This is different every time
echo "Encrypted with private key: " . base64_encode($encryptedWithPrivate) . "\n";
echo "Decrypted with private key what was encrypted with public key: " . $decryptedWithPrivateFromPublic . "\n";
echo "Decrypted with public key what was encrypted with private key: " . $decryptedWithPublicFromPrivate . "\n";