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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.security.tool.crypto;
import ai.vespa.airlift.zstd.ZstdInputStream;
import com.yahoo.compress.ZstdOutputStream;
import com.yahoo.security.AeadCipher;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* @author vekterli
*/
public class CipherUtils {
/**
* Streams the contents of an input stream into an output stream after being wrapped by the input cipher.
* Depending on the Cipher mode, this either encrypts a plaintext stream into ciphertext,
* or decrypts a ciphertext stream into plaintext.
*
* @param input source stream to read from
* @param output destination stream to write to
* @param cipher an {@link AeadCipher} created for either encryption or decryption
* @throws IOException if any file operation fails
*/
public static void streamEncipher(InputStream input, OutputStream output, AeadCipher cipher) throws IOException {
try (var cipherStream = cipher.wrapOutputStream(output)) {
input.transferTo(cipherStream);
cipherStream.flush();
}
}
private static OutputStream maybeWrapCompress(OutputStream out, boolean compressZstd) throws IOException {
return compressZstd ? new ZstdOutputStream(out) : out;
}
public static void streamEncrypt(InputStream input, OutputStream output, AeadCipher cipher, boolean compressZstd) throws IOException {
try (var out = maybeWrapCompress(cipher.wrapOutputStream(output), compressZstd)) {
input.transferTo(out);
out.flush();
}
}
private static InputStream maybeWrapDecompress(InputStream in, boolean decompressZstd) throws IOException {
return decompressZstd ? new ZstdInputStream(in) : in;
}
public static void streamDecrypt(InputStream input, OutputStream output, AeadCipher cipher, boolean decompressZstd) throws IOException {
try (var in = maybeWrapDecompress(cipher.wrapInputStream(input), decompressZstd)) {
in.transferTo(output);
output.flush();
}
}
}
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