To generate a new private key in PEM format in PHP, you can use the OpenSSL library. Here's an example code snippet that demonstrates how to generate a new private key in PEM format:
$config = array( "digest_alg" => "sha512", "private_key_bits" => 2048, "private_key_type" => OPENSSL_KEYTYPE_RSA, ); // Create a new private key $privateKey = openssl_pkey_new($config); // Extract the private key to a string in PEM format openssl_pkey_export($privateKey, $pemKey); // Output the private key echo $pemKey;
This code generates a new RSA private key with 2048 bits and the SHA-512 hash function, and then extracts the private key to a string in PEM format using the openssl_pkey_export() function. The resulting PEM key is then output to the console, but you could also write it to a file or use it in your PHP code as needed.
Note that you may need to adjust the parameters in the $config array to suit your specific needs, such as choosing a different key size or hash algorithm.
If you have a private key in a format other than PEM and you need to convert it to PEM format before using the openssl_pkey_get_private() function in PHP, you can use the OpenSSL library in PHP to perform the conversion.
Assuming you have a private key in DER format, you can convert it to PEM format using the following code:
$derKey = file_get_contents('private_key.der'); $pemKey = openssl_pkey_get_private($derKey); openssl_pkey_export($pemKey, $pemKeyString); file_put_contents('private_key.pem', $pemKeyString);
Replace private_key.der with the name of your private key file in DER format, and private_key.pem with the desired name of the output file in PEM format. If your private key is in a different format, adjust the code accordingly.
This code reads the private key from the DER file, converts it to a PEM format using openssl_pkey_get_private() and openssl_pkey_export(), and then writes the resulting PEM key to a file. You can then use the PEM key with openssl_pkey_get_private() to load it into PHP.