Java

PKCS7 Sign Text using RSA 2048, SHA256, Base64 Output

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Demonstrates how to sign text using 2048-bit RSA with SHA256, producing PKCS#7 output in Base64. The certificate w/ private key used for signing is loaded from a .p12/.pfx file. Chilkat2 Java

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

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.

        Cert cert = new Cert();

        // Load the cert and private key.  Whatever the private key happens to be,
        // such as RSA or ECC, then Chilkat will use it.  If the private key is
        // a 2048-bit RSA key, then that's what will be used..
        try {
            cert.loadPfxFile("qa_data/pfx/myCertAndKey.p12", "password");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Crypt2 crypt = new Crypt2();

        try {
            crypt.setSigningCert(cert);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Use SHA-256
        crypt.setHashAlgorithm("sha256");

        // Hash the utf-8 byte representation of the string
        crypt.setCharset("utf-8");

        // Return the result in base64
        crypt.setEncodingMode("base64");

        // Sign some text..
        String textToSign = "This is the text to be hashed and signed.";
        String sigBase64;
        try {
            sigBase64 = crypt.opaqueSignStringENC(textToSign);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println(sigBase64);

        // The result:
        // MIIS2wYJKoZIhvcNAQc ... zGeeY4Oxg==
    }
}