Example usage for org.apache.poi.poifs.crypt ChainingMode cbc

Introduction

In this page you can find the example usage for org.apache.poi.poifs.crypt ChainingMode cbc.

Prototype

ChainingMode cbc

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Usage

From source file:com.github.poi.AesZipFileZipEntrySource.java

License:Apache License

private static void copyToFile(InputStream is, File tmpFile, CipherAlgorithm cipherAlgorithm, byte keyBytes[],
        byte ivBytes[]) throws IOException, GeneralSecurityException {
    SecretKeySpec skeySpec = new SecretKeySpec(keyBytes, cipherAlgorithm.jceId);
    Cipher ciEnc = CryptoFunctions.getCipher(skeySpec, cipherAlgorithm, ChainingMode.cbc, ivBytes,
            Cipher.ENCRYPT_MODE, "PKCS5Padding");

    ZipInputStream zis = new ZipInputStream(is);
    FileOutputStream fos = new FileOutputStream(tmpFile);
    ZipOutputStream zos = new ZipOutputStream(fos);

    ZipEntry ze;//from   w ww.ja  v  a 2 s .  c o  m
    while ((ze = zis.getNextEntry()) != null) {
        // the cipher output stream pads the data, therefore we can't reuse the ZipEntry with set sizes
        // as those will be validated upon close()
        ZipEntry zeNew = new ZipEntry(ze.getName());
        zeNew.setComment(ze.getComment());
        zeNew.setExtra(ze.getExtra());
        zeNew.setTime(ze.getTime());
        // zeNew.setMethod(ze.getMethod());
        zos.putNextEntry(zeNew);
        FilterOutputStream fos2 = new FilterOutputStream(zos) {
            // don't close underlying ZipOutputStream
            @Override
            public void close() {
            }
        };
        CipherOutputStream cos = new CipherOutputStream(fos2, ciEnc);
        IOUtils.copy(zis, cos);
        cos.close();
        fos2.close();
        zos.closeEntry();
        zis.closeEntry();
    }
    zos.close();
    fos.close();
    zis.close();
}

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From source file:com.github.poi.AesZipFileZipEntrySource.java

License:Apache License

private static AesZipFileZipEntrySource fileToSource(File tmpFile, CipherAlgorithm cipherAlgorithm,
        byte keyBytes[], byte ivBytes[]) throws ZipException, IOException {
    SecretKeySpec skeySpec = new SecretKeySpec(keyBytes, cipherAlgorithm.jceId);
    Cipher ciDec = CryptoFunctions.getCipher(skeySpec, cipherAlgorithm, ChainingMode.cbc, ivBytes,
            Cipher.DECRYPT_MODE, "PKCS5Padding");
    return new AesZipFileZipEntrySource(tmpFile, ciDec);
}

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