Java

RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

See more Encryption Examples

Encrypts a string using RSAES-OAEP with SHA256 and AES-128 content encryption to produce PKCS7 output (base64 encoded).

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

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

        // First build a string to be encrypted
        StringBuilder sb = new StringBuilder();
        int i = 1;
        while (i < 25) {
            sb.appendInt(i);
            sb.append(" the quick brown fox jumped over the lazy dog.\r\n");
            i = i + 1;
        }

        System.out.println(sb.getAsString());

        // The string to be encrypted looks like this:

        // 1 the quick brown fox jumped over the lazy dog.
        // 2 the quick brown fox jumped over the lazy dog.
        // 3 the quick brown fox jumped over the lazy dog.
        // 4 the quick brown fox jumped over the lazy dog.
        // 5 the quick brown fox jumped over the lazy dog.
        // 6 the quick brown fox jumped over the lazy dog.
        // ...

        // 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).
        Cert cert = new Cert();
        try {
            cert.loadFromFile("qa_data/rsaes-oaep/cert.pem");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Crypt2 crypt = new Crypt2();

        // Tell the crypt object to use the certificate.
        crypt.setEncryptCert(cert);

        // 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);

        // Also, don't forget to be specific about the character encoding (byte representation) of the
        // string to be encrypted.
        crypt.setCharset("utf-8");

        // Now indicate that the PKCS7 output is to be returned in the base64 encoding.
        crypt.setEncodingMode("base64");

        String base64Pkcs7;
        try {
            base64Pkcs7 = crypt.encryptStringENC(sb.getAsString());
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Show the output
        System.out.println(base64Pkcs7);

        // This base64 can be copy-and-pasted into the form at http://lapo.it/asn1js/
        // to verify that all the chosen algorithms were indeed used.

        System.out.println("OK.");
    }
}