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(Go) 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.
// This example requires the Chilkat Crypt API to have been previously unlocked. // See Unlock Chilkat Crypt for sample code. crypt := chilkat.NewCrypt2() // 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 := chilkat.NewCert() 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 := chilkat.NewCert() success = cert2.LoadFromFile("qa_data/user2/cert_user2.pem") crypt.AddEncryptCert(cert2) cert3 := chilkat.NewCert() 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.SetCryptAlgorithm("pki") crypt.SetPkcs7CryptAlg("aes") crypt.SetKeyLength(128) crypt.SetOaepHash("sha256") crypt.SetOaepPadding(true) // Load the file to be encrypted... fileData := chilkat.NewBinData() 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 { fmt.Println(crypt.LastErrorText()) crypt.DisposeCrypt2() cert1.DisposeCert() cert2.DisposeCert() cert3.DisposeCert() fileData.DisposeBinData() return } // 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.SetEncodingMode("base64") fmt.Println("OK.") crypt.DisposeCrypt2() cert1.DisposeCert() cert2.DisposeCert() cert3.DisposeCert() fileData.DisposeBinData() |
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