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(Java) openssl enc decrypt

Demonstrates how to decrypt a file that was encrypted using "openssl enc".

This example shows how to decrypt what was created using this openssl command:

openssl enc -e -aes-256-cbc -in hamlet.xml -out hamlet.enc -pass file:./secret.txt

This example shows how to do this:

openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt

Note: This example requires Chilkat v9.5.0.71 or later.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkCrypt2 crypt = new CkCrypt2();

    boolean success = crypt.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    //  Use aes-256-cbc
    crypt.put_CryptAlgorithm("aes");
    crypt.put_CipherMode("cbc");
    crypt.put_KeyLength(256);

    //  We'll need to set the hash algorithm to either MD5 or SHA256.
    //  openssl version 1.0.* or earlier used MD5 by default
    //  openssl version 1.1.* uses SHA-256 for the password to secret key derivation.

    //  For example, if openssl 1.1.0 was used, we should do this:
    crypt.put_HashAlgorithm("sha256");

    //  This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
    crypt.put_HashAlgorithm("md5");

    //  The openssl command we are duplicating is:
    // 
    //     openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt
    // 
    //  The file secret.txt contains the word "secret".  We could write code to load the contents
    //  of secret.txt, but instead we'll just do this:
    crypt.SetSecretKeyViaPassword("secret");

    //  Load the file to be decrypted.
    CkBinData fileData = new CkBinData();
    success = fileData.LoadFile("qa_data/openssl_enc/hamlet.enc");

    //  Decrypt
    success = crypt.DecryptBd(fileData);

    //  Save the decrypted output.
    success = fileData.WriteFile("qa_output/hamlet_dec.xml");

    System.out.println("success = " + success);
  }
}

 

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