Example usage for org.bouncycastle.openpgp PGPV3SignatureGenerator update

Introduction

In this page you can find the example usage for org.bouncycastle.openpgp PGPV3SignatureGenerator update.

Prototype

public void update(byte[] b) throws PGPSignatureException 

Source Link

Usage

From source file:com.geekcommune.identity.EncryptionUtil.java

License:Open Source License

/**
 * UNUSED IN FRIENDLY BACKUP//from  w  w  w .j  av a 2s.c o m
 * Sign the passed in message stream (version 3 signature)
 */
private void signDataV3(File inFile, OutputStream aOut, PGPPublicKey publicKey, PGPPrivateKey privateKey)
        throws PGPException {
    try {
        PGPCompressedDataGenerator cGen = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
        BCPGOutputStream bOut = new BCPGOutputStream(cGen.open(aOut));
        PGPLiteralDataGenerator lGen = new PGPLiteralDataGenerator(true);

        PGPV3SignatureGenerator s3Gen = new PGPV3SignatureGenerator(publicKey.getAlgorithm(), PGPUtil.SHA1,
                "BC");

        s3Gen.initSign(PGPSignature.BINARY_DOCUMENT, privateKey);

        s3Gen.generateOnePassVersion(false).encode(bOut);

        OutputStream lOut = lGen.open(bOut, PGPLiteralData.BINARY, inFile);

        FileInputStream fIn = new FileInputStream(inFile);

        int ch;
        while ((ch = fIn.read()) >= 0) {
            lOut.write(ch);
            s3Gen.update((byte) ch);
        }

        fIn.close();

        // close() finishes the writing of the literal data and flushes the stream
        // It does not close bOut so this is ok here
        lGen.close();

        // Generate the signature
        s3Gen.generate().encode(bOut);

        // Must not close bOut here
        bOut.finish();
        bOut.flush();

        cGen.close();
    } catch (PGPException e) {
        throw e;
    } catch (Exception e) {
        throw new PGPException("Error in signing", e);
    }
}

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