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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 com.yahoo.security.KeyId;
import com.yahoo.security.KeyUtils;
import com.yahoo.security.SharedKeyGenerator;
import com.yahoo.vespa.security.tool.CliUtils;
import com.yahoo.vespa.security.tool.Tool;
import com.yahoo.vespa.security.tool.ToolDescription;
import com.yahoo.vespa.security.tool.ToolInvocation;
import org.apache.commons.cli.Option;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
/**
* Tooling to encrypt a file using a public key, emitting a non-secret token that can be
* passed on to a recipient holding the corresponding private key.
*
* Uses the opaque token abstraction from {@link SharedKeyGenerator}.
*
* @author vekterli
*/
public class EncryptTool implements Tool {
static final String OUTPUT_FILE_OPTION = "output-file";
static final String KEY_ID_OPTION = "key-id";
static final String RECIPIENT_PUBLIC_KEY_OPTION = "recipient-public-key";
static final String ZSTD_COMPRESS_OPTION = "zstd-compress";
private static final List<Option> OPTIONS = List.of(
Option.builder("o")
.longOpt(OUTPUT_FILE_OPTION)
.hasArg(true)
.required(false)
.desc("Output file (will be truncated if it already exists)")
.build(),
Option.builder("r")
.longOpt(RECIPIENT_PUBLIC_KEY_OPTION)
.hasArg(true)
.required(false)
.desc("Recipient X25519 public key in Base58 encoded format")
.build(),
Option.builder("i")
.longOpt(KEY_ID_OPTION)
.hasArg(true)
.required(false)
.desc("ID of recipient key")
.build(),
Option.builder("z")
.longOpt(ZSTD_COMPRESS_OPTION)
.hasArg(false)
.required(false)
.desc("Input data will be transparently Zstd-compressed before being encrypted.")
.build());
@Override
public String name() {
return "encrypt";
}
@Override
public ToolDescription description() {
return new ToolDescription(
"<input file> <options>",
"One-way encrypts a file using the public key of a recipient. A public token is printed on " +
"standard out. The recipient can use this token to decrypt the file using their private key. " +
"The token does not have to be kept secret.\n\n" +
"To encrypt the contents of STDIN, specify an input file of '-' (without the quotes).",
"Note: this is a BETA tool version; its interface may be changed at any time",
OPTIONS);
}
@Override
public int invoke(ToolInvocation invocation) {
try {
var arguments = invocation.arguments();
var leftoverArgs = arguments.getArgs();
if (leftoverArgs.length != 1) {
throw new IllegalArgumentException("Expected exactly 1 file argument to encrypt");
}
var inputArg = leftoverArgs[0];
var outputPath = Paths.get(CliUtils.optionOrThrow(arguments, OUTPUT_FILE_OPTION));
var recipientPubKey = KeyUtils.fromBase58EncodedX25519PublicKey(CliUtils.optionOrThrow(arguments, RECIPIENT_PUBLIC_KEY_OPTION).strip());
var keyId = KeyId.ofString(CliUtils.optionOrThrow(arguments, KEY_ID_OPTION));
var shared = SharedKeyGenerator.generateForReceiverPublicKey(recipientPubKey, keyId);
var cipher = shared.makeEncryptionCipher();
boolean zstd = arguments.hasOption(ZSTD_COMPRESS_OPTION);
try (var inStream = CliUtils.inputStreamFromFileOrStream(inputArg, invocation.stdIn());
var outStream = Files.newOutputStream(outputPath)) {
CipherUtils.streamEncrypt(inStream, outStream, cipher, zstd);
}
invocation.stdOut().println(shared.sealedSharedKey().toTokenString());
} catch (IOException e) {
throw new RuntimeException(e);
}
return 0;
}
}
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