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(PHP Extension) Encrypt a file to a PKCS7 encrypted message using multiple certificates from different usersDemonstrates how to encrypt a file to a PKCS7 encrypted message using multiple certificates from different users. Any one of the users can decrypt using his/her own certificate + private key. Note: When doing public key encryption, it is the public key that is used to encrypt. The private key is required for decryption.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat Crypt API to have been previously unlocked. // See Unlock Chilkat Crypt for sample code. $crypt = new CkCrypt2(); // Tell the crypt object to use 3 certificates. // Do this by calling AddEncryptCert for each certificate. // Load a digital certificate. // We don't need the private key for encryption. // Only the public key is needed (which is included in a certificate). $cert1 = new CkCert(); $success = $cert1->LoadFromFile('qa_data/user1/cert_user1.pem'); // Assume success for the example, but make sure your application checks for success/failure... $crypt->AddEncryptCert($cert1); $cert2 = new CkCert(); $success = $cert2->LoadFromFile('qa_data/user2/cert_user2.pem'); $crypt->AddEncryptCert($cert2); $cert3 = new CkCert(); $success = $cert3->LoadFromFile('qa_data/user3/cert_user3.pem'); $crypt->AddEncryptCert($cert3); // Indicate that we want PKI encryption (i.e. public-key infrastructure) // to produce a CMS message (Cryptographic Message Syntax/PKCS7), // that is be created with RSAES-OAEP padding, SHA256, and AES-128 for the // bulk encryption. $crypt->put_CryptAlgorithm('pki'); $crypt->put_Pkcs7CryptAlg('aes'); $crypt->put_KeyLength(128); $crypt->put_OaepHash('sha256'); $crypt->put_OaepPadding(true); // Load the file to be encrypted... $fileData = new CkBinData(); $success = $fileData->LoadFile('qa_data/jpg/penguins.jpg'); // Your app should check for success/failure.. // Encrypt the data. The contents of the fileData object are replaced with the PKCS7 encrypted message. $success = $crypt->EncryptBd($fileData); if ($success != true) { print $crypt->lastErrorText() . "\n"; exit; } // Save the PKCS7 encrypted message to a file.. $success = $fileData->WriteFile('qa_output/pkcs7_encrypted.p7'); // Now indicate that the PKCS7 output is to be returned in the base64 encoding. $crypt->put_EncodingMode('base64'); print 'OK.' . "\n"; ?> |
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