John Davidson

Message:

how to decrypt using RSA OAEP with SHA256 on PHP.?

maybe using some package or manual? I dont know how to use it with PHP.

example logic :

openssl base64 -A -d -in $encrypt > $temp.bin

openssl pkeyutl -decrypt -inkey $private -in $temp.bin -out $temp.txt -pkeyopt rsa_padding_mode:oaep -pkeyopt rsa_oaep_md:sha256 

---

My Answer:
To decrypt using RSA OAEP with SHA256 in PHP, you can use the openssl_decrypt function with the appropriate parameters. Here is an example code snippet to decrypt the encrypted data using RSA OAEP with SHA256:

php

// Encrypted data
$encryptedData = base64_decode($encrypt);

// Private key
$privateKey = openssl_pkey_get_private('file://path/to/private_key.pem');

// Decrypt the data using RSA OAEP with SHA256
$decryptedData = '';
openssl_private_decrypt($encryptedData, $decryptedData, $privateKey, OPENSSL_PKCS1_OAEP_PADDING);

// Output the decrypted data
echo $decryptedData;

?>


Make sure to replace 'path/to/private_key.pem' with the actual path to your private key file. This code snippet assumes that you have the private key in PEM format.

You can also use the phpseclib library for RSA encryption and decryption in PHP. Here is an example using phpseclib:

php

include('Crypt/RSA.php');

// Encrypted data
$encryptedData = base64_decode($encrypt);

// Private key
$privateKey = file_get_contents('path/to/private_key.pem');

// Create an instance of the RSA class
$rsa = new Crypt_RSA();
$rsa->loadKey($privateKey);

// Decrypt the data using RSA OAEP with SHA256
$rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_OAEP);
$decryptedData = $rsa->decrypt($encryptedData);

// Output the decrypted data
echo $decryptedData;

?>


Make sure to replace 'path/to/private_key.pem' with the actual path to your private key file. This code snippet uses the phpseclib library for RSA encryption and decryption in PHP.