Example usage for java.security DigestOutputStream DigestOutputStream

Introduction

In this page you can find the example usage for java.security DigestOutputStream DigestOutputStream.

Prototype

public DigestOutputStream(OutputStream stream, MessageDigest digest)

Source Link

Document

Creates a digest output stream, using the specified output stream and message digest.

Usage

From source file:ro.kuberam.libs.java.crypto.CryptoModuleTests.java

@Test
public void digestOutputStreamTest() throws Exception {
    final MessageDigest md = MessageDigest.getInstance("SHA-512");

    try (final OutputStream fos = Files.newOutputStream(Paths
            .get("/home/claudius/workspace-claudius/expath-crypto/src/org/expath/crypto/tests/string.txt"));
            final DigestOutputStream dos = new DigestOutputStream(fos, md);
            final ObjectOutputStream oos = new ObjectOutputStream(dos)) {

        final String data = "This have I thought good to deliver thee, "
                + "that thou mightst not lose the dues of rejoicing "
                + "by being ignorant of what greatness is promised thee.";
        oos.writeObject(data);//  w  w w .j a  v  a 2s  . c om
        dos.on(false);
        final byte[] digest = md.digest();
        oos.writeObject(digest);
        final int digestLength = digest.length;
        System.out.println("length: " + digestLength);
        final BigInteger bi = new BigInteger(1, digest);
        String result = bi.toString(digestLength);
        if (result.length() % 2 != 0) {
            result = "0" + result;
        }

        System.out.println("result: " + result);
    }
}