package org.jboss.resteasy.jose.jwe.crypto;
import org.jboss.resteasy.jose.i18n.Messages;
import org.jboss.resteasy.jose.jwe.CompressionAlgorithm;
/**
* Deflate (RFC 1951) helper methods, intended for use by JWE encrypters and
* decrypters.
*
* @author Vladimir Dzhuvinov
* @version $version$ (2013-04-16)
*/
class DeflateHelper
{
/**
* Applies compression to the specified plain text if requested.
*
* @param compressionAlg .
* @param bytes The plain text bytes. Must not be
* {@code null}.
*
* @return The bytes to encrypt.
*
* @throws RuntimeException If compression failed or the requested
* compression algorithm is not supported.
*/
public static byte[] applyCompression(final CompressionAlgorithm compressionAlg, final byte[] bytes)
throws RuntimeException {
if (compressionAlg == null) {
return bytes;
} else if (compressionAlg.equals(CompressionAlgorithm.DEF)) {
try {
return DeflateUtils.compress(bytes);
} catch (Exception e) {
throw new RuntimeException(Messages.MESSAGES.couldntCompressPlainText(e.getLocalizedMessage()), e);
}
} else {
throw new RuntimeException(Messages.MESSAGES.unsupportedCompressionAlgorithm(compressionAlg));
}
}
/**
* Applies decompression to the specified plain text if requested.
*
* @param compressionAlg
* @param bytes The plain text bytes. Must not be
* {@code null}.
*
* @return The output bytes, decompressed if requested.
*
* @throws RuntimeException If decompression failed or the requested
* compression algorithm is not supported.
*/
public static byte[] applyDecompression(final CompressionAlgorithm compressionAlg, final byte[] bytes)
throws RuntimeException {
if (compressionAlg == null) {
return bytes;
} else if (compressionAlg.equals(CompressionAlgorithm.DEF)) {
try {
return DeflateUtils.decompress(bytes);
} catch (Exception e) {
throw new RuntimeException(Messages.MESSAGES.couldntDecompressPlainText(e.getLocalizedMessage()), e);
}
} else {
throw new RuntimeException(Messages.MESSAGES.unsupportedCompressionAlgorithm(compressionAlg));
}
}
}