Java Requires Chilkat v11.1.0+

openssl enc decrypt

See more Encryption Examples

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

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;

public class ChilkatExample {

    public static void main(String[] args) {
        boolean success = false;

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

        Crypt2 crypt = new Crypt2();

        // Use aes-256-cbc
        crypt.setCryptAlgorithm("aes");
        crypt.setCipherMode("cbc");
        crypt.setKeyLength(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.setHashAlgorithm("sha256");

        // This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
        crypt.setHashAlgorithm("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.setEncodedKey("secret", "openssl");

        // Load the file to be decrypted.
        BinData fileData = new BinData();
        fileData.loadFile("qa_data/openssl_enc/hamlet.enc");

        // Decrypt
        crypt.setVerboseLogging(true);
        try {
            crypt.decryptBd(fileData);
        } catch (ChilkatException e) {
            // crypt.getLastErrorText() (below) shows what happened.
        }
        System.out.println(crypt.getLastErrorText());

        // Save the decrypted output.
        try {
            fileData.writeFile("c:/temp/qa_output/hamlet_dec.xml");
            success = true;
        } catch (ChilkatException e) {
            success = false;
        }

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