More about PHP using the OpenSSL extension for public key cryptography

generating public and private keys using the OpenSSL command

Generate private Key # OpenSSL genrsa-out Rsa_private_key.pem 1024//generate public Key # OpenSSL rsa-in rsa_private_key.pem-pubout-out rsa_public_ Key.pem

Here is the sample code:

<?php//OpenSSL extended Detection var_dump (extension_loaded (' OpenSSL ')); $prikey = Openssl_pkey_get_private (file_get_contents ( ' Rsa_private_key.pem ')); Private key $pubkey = Openssl_pkey_get_public (file_get_contents (' Rsa_public_key.pem ')); Public key//plaintext data $data = ' test-string! '; * * Issues that may arise: Don ' t know how to get public key from the This private key * cause: PHP's OpenSSL extension and Apache inconsistency cause, of course, running the program at the command line will not appear This issue *///public key cryptography $encrypt_data = "; Openssl_public_encrypt ($data, $encrypt _data, $pubkey); $encrypt _data = Base64_encode ($ Encrypt_data); Echo $encrypt _data;echo ' <br/> ';//---------------------------------------------------------- --//private key Decryption $encrypt_data = Base64_decode ($encrypt _data); Openssl_private_decrypt ($encrypt _data, $decrypt _data, $prikey ); Var_dump ($decrypt _data);