Java Requires Chilkat v11.0.0+

Create a Hash Signature for Value Added Tax Audit SOAP Message for Angola

See more OpenSSL Examples

Demonstrates how to create a hash signature that is required in Value Added Tax Audit Files in Angola, Africa.

It is the following two instructions that should be used to create a hash value to be put into a <hash></hash> field in SOAP XML file containing the tax data for the VAT authorities:

openssl dgst -shal -sign private.pem -outRegisto1.shal Registo1.txt

then

openssl enc -base64 - in Registo1.shal -out Registo1.b64 -A

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.Rsa;

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.

        PrivateKey pkey = new PrivateKey();

        // Load the private key from an PEM file.
        // Provide the password in the 2nd argument.
        // If no password is needed, just pass an empty string.
        try {
            pkey.loadAnyFormatFile("qa_data/rsa/rsaPrivKey_secret.pem", "secret");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Assuming this is an RSA private key..
        Rsa rsa = new Rsa();

        // Import the private key into the RSA object:
        try {
            rsa.usePrivateKey(pkey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // OpenSSL uses big-endian.
        rsa.setLittleEndian(false);

        // SHA1 hash and sign, and return base64.
        rsa.setEncodingMode("base64");
        String b64sig = rsa.signStringENC("2018-05-18,2018-05-18T11:22:19;FAC 001/18;53.00;", "sha1");
        System.out.println(b64sig);

        // The signature is equal in size to your private key.  For example, if you have a 1024-bit RSA key,
        // then 1024 bits = 128 bytes.   When 128 bytes is base64 encoded, the result is a string approximately
        // 4/3rds the size of the original.  128 * 4 / 3 = (approximately) 172 bytes.

        // If your RSA key is 2048-bits, then your signature will be twice as long.
    }
}