Dart

Duplicate openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

See more OpenSSL Examples

Demonstrates how to encrypt to binary DER using 256-bit AES (CBC mode) as the underlying symmetric encryption algorithm, to produce PKCS7 enveloped data (binary DER).

Duplicates the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final cert = CkCert();
  try {
    cert.loadFromFile('qa_data/openssl/EE.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final bd = CkBinData();
  bd.loadFile('qa_data/openssl/hello.txt');
  // Assuming success..

  final crypt = CkCrypt2();
  try {
    crypt.setEncryptCert(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  crypt.cryptAlgorithm = 'PKI';

  // Indicate the underlying symmetric encryption to be used:
  crypt.pkcs7CryptAlg = 'aes';
  crypt.keyLength = 256;
  crypt.cipherMode = 'cbc';

  try {
    crypt.ckEncryptFile('qa_data/openssl/hello.txt', 'qa_output/hello.txt.enc');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Success.');
}