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Refactor EncryptionStream
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commit
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GPG key ID:
62BEE9264BF17311
1 changed files with 110 additions and 78 deletions
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@ -21,7 +21,6 @@ import java.io.OutputStream;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Date;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import java.util.logging.Level;
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@ -57,22 +56,26 @@ public final class EncryptionStream extends OutputStream {
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private static final int BUFFER_SIZE = 1 << 8;
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private final SymmetricKeyAlgorithm symmetricKeyAlgorithm;
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private final HashAlgorithm hashAlgorithm;
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private final CompressionAlgorithm compressionAlgorithm;
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private final Set<PGPPublicKey> encryptionKeys;
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private final Set<PGPPrivateKey> signingKeys;
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private final boolean asciiArmor;
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private final OpenPgpMetadata.Builder resultBuilder = OpenPgpMetadata.getBuilder();
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private List<PGPSignatureGenerator> signatureGenerators = new ArrayList<>();
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private boolean closed = false;
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// ASCII Armor
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private ArmoredOutputStream armorOutputStream = null;
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OutputStream outermostStream = null;
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// Public Key Encryption of Symmetric Session Key
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private ArmoredOutputStream armorOutputStream = null;
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private OutputStream publicKeyEncryptedStream = null;
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// Data Compression
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private PGPCompressedDataGenerator compressedDataGenerator;
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private BCPGOutputStream basicCompressionStream;
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// Literal Data
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private PGPLiteralDataGenerator literalDataGenerator;
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private OutputStream literalDataStream;
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@ -85,68 +88,93 @@ public final class EncryptionStream extends OutputStream {
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boolean asciiArmor)
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throws IOException, PGPException {
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// Currently outermost Stream
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OutputStream outerMostStream;
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if (asciiArmor) {
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LOGGER.log(LEVEL, "Wrap encryption output in ASCII armor");
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armorOutputStream = new ArmoredOutputStream(targetOutputStream);
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outerMostStream = armorOutputStream;
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} else {
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this.symmetricKeyAlgorithm = symmetricKeyAlgorithm;
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this.hashAlgorithm = hashAlgorithm;
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this.compressionAlgorithm = compressionAlgorithm;
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this.encryptionKeys = Collections.unmodifiableSet(encryptionKeys);
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this.signingKeys = Collections.unmodifiableSet(signingKeys);
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this.asciiArmor = asciiArmor;
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outermostStream = targetOutputStream;
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prepareArmor();
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prepareEncryption();
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prepareSigning();
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prepareCompression();
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prepareOnePassSignatures();
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prepareLiteralDataProcessing();
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prepareResultBuilder();
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}
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private void prepareArmor() {
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if (!asciiArmor) {
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LOGGER.log(LEVEL, "Encryption output will be binary");
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outerMostStream = targetOutputStream;
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return;
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}
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// If we want to encrypt
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if (!encryptionKeys.isEmpty()) {
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LOGGER.log(LEVEL, "At least one encryption key is available -> encrypt using " + symmetricKeyAlgorithm);
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BcPGPDataEncryptorBuilder dataEncryptorBuilder =
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new BcPGPDataEncryptorBuilder(symmetricKeyAlgorithm.getAlgorithmId());
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LOGGER.log(LEVEL, "Wrap encryption output in ASCII armor");
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armorOutputStream = new ArmoredOutputStream(outermostStream);
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outermostStream = armorOutputStream;
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}
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LOGGER.log(LEVEL, "Integrity protection enabled");
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dataEncryptorBuilder.setWithIntegrityPacket(true);
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PGPEncryptedDataGenerator encryptedDataGenerator =
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new PGPEncryptedDataGenerator(dataEncryptorBuilder);
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for (PGPPublicKey key : encryptionKeys) {
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LOGGER.log(LEVEL, "Encrypt for key " + Long.toHexString(key.getKeyID()));
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encryptedDataGenerator.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(key));
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}
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publicKeyEncryptedStream = encryptedDataGenerator.open(outerMostStream, new byte[BUFFER_SIZE]);
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outerMostStream = publicKeyEncryptedStream;
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private void prepareEncryption() throws IOException, PGPException {
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if (encryptionKeys.isEmpty()) {
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return;
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}
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// If we want to sign, prepare for signing
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if (!signingKeys.isEmpty()) {
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LOGGER.log(LEVEL, "At least one signing key is available -> sign " + hashAlgorithm + " hash of message");
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for (PGPPrivateKey privateKey : signingKeys) {
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LOGGER.log(LEVEL, "Sign using key " + Long.toHexString(privateKey.getKeyID()));
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BcPGPContentSignerBuilder contentSignerBuilder = new BcPGPContentSignerBuilder(
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privateKey.getPublicKeyPacket().getAlgorithm(), hashAlgorithm.getAlgorithmId());
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LOGGER.log(LEVEL, "At least one encryption key is available -> encrypt using " + symmetricKeyAlgorithm);
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BcPGPDataEncryptorBuilder dataEncryptorBuilder =
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new BcPGPDataEncryptorBuilder(symmetricKeyAlgorithm.getAlgorithmId());
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PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(contentSignerBuilder);
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signatureGenerator.init(PGPSignature.BINARY_DOCUMENT, privateKey);
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signatureGenerators.add(signatureGenerator);
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}
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dataEncryptorBuilder.setWithIntegrityPacket(true);
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PGPEncryptedDataGenerator encryptedDataGenerator =
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new PGPEncryptedDataGenerator(dataEncryptorBuilder);
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for (PGPPublicKey key : encryptionKeys) {
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LOGGER.log(LEVEL, "Encrypt for key " + Long.toHexString(key.getKeyID()));
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encryptedDataGenerator.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(key));
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}
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publicKeyEncryptedStream = encryptedDataGenerator.open(outermostStream, new byte[BUFFER_SIZE]);
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outermostStream = publicKeyEncryptedStream;
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}
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private void prepareSigning() throws PGPException {
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if (signingKeys.isEmpty()) {
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return;
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}
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LOGGER.log(LEVEL, "At least one signing key is available -> sign " + hashAlgorithm + " hash of message");
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for (PGPPrivateKey privateKey : signingKeys) {
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LOGGER.log(LEVEL, "Sign using key " + Long.toHexString(privateKey.getKeyID()));
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BcPGPContentSignerBuilder contentSignerBuilder = new BcPGPContentSignerBuilder(
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privateKey.getPublicKeyPacket().getAlgorithm(), hashAlgorithm.getAlgorithmId());
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PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(contentSignerBuilder);
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signatureGenerator.init(PGPSignature.BINARY_DOCUMENT, privateKey);
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signatureGenerators.add(signatureGenerator);
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}
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}
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private void prepareCompression() throws IOException {
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LOGGER.log(LEVEL, "Compress using " + compressionAlgorithm);
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// Compression
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compressedDataGenerator = new PGPCompressedDataGenerator(
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compressionAlgorithm.getAlgorithmId());
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basicCompressionStream = new BCPGOutputStream(compressedDataGenerator.open(outerMostStream));
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basicCompressionStream = new BCPGOutputStream(compressedDataGenerator.open(outermostStream));
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}
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// If we want to sign, sign!
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private void prepareOnePassSignatures() throws IOException, PGPException {
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for (PGPSignatureGenerator signatureGenerator : signatureGenerators) {
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signatureGenerator.generateOnePassVersion(false).encode(basicCompressionStream);
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}
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}
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private void prepareLiteralDataProcessing() throws IOException {
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literalDataGenerator = new PGPLiteralDataGenerator();
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literalDataStream = literalDataGenerator.open(basicCompressionStream,
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PGPLiteralData.BINARY, PGPLiteralData.CONSOLE, new Date(), new byte[BUFFER_SIZE]);
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}
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// Prepare result
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private void prepareResultBuilder() {
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for (PGPPublicKey recipient : encryptionKeys) {
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resultBuilder.addRecipientKeyId(recipient.getKeyID());
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}
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@ -185,40 +213,44 @@ public final class EncryptionStream extends OutputStream {
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@Override
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public void close() throws IOException {
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if (!closed) {
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if (closed) {
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return;
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}
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// Literal Data
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literalDataStream.flush();
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literalDataStream.close();
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literalDataGenerator.close();
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// Literal Data
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literalDataStream.flush();
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literalDataStream.close();
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literalDataGenerator.close();
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// Signing
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for (PGPSignatureGenerator signatureGenerator : signatureGenerators) {
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try {
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PGPSignature signature = signatureGenerator.generate();
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signature.encode(basicCompressionStream);
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resultBuilder.addSignature(signature);
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resultBuilder.addUnverifiedSignatureKeyId(signature.getKeyID());
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} catch (PGPException e) {
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throw new IOException(e);
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}
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writeSignatures();
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// Compressed Data
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compressedDataGenerator.close();
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// Public Key Encryption
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if (publicKeyEncryptedStream != null) {
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publicKeyEncryptedStream.flush();
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publicKeyEncryptedStream.close();
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}
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// Armor
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if (armorOutputStream != null) {
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armorOutputStream.flush();
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armorOutputStream.close();
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}
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closed = true;
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}
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private void writeSignatures() throws IOException {
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for (PGPSignatureGenerator signatureGenerator : signatureGenerators) {
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try {
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PGPSignature signature = signatureGenerator.generate();
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signature.encode(basicCompressionStream);
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resultBuilder.addSignature(signature);
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resultBuilder.addUnverifiedSignatureKeyId(signature.getKeyID());
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} catch (PGPException e) {
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throw new IOException(e);
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}
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// Compressed Data
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compressedDataGenerator.close();
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// Public Key Encryption
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if (publicKeyEncryptedStream != null) {
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publicKeyEncryptedStream.flush();
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publicKeyEncryptedStream.close();
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}
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// Armor
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if (armorOutputStream != null) {
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armorOutputStream.flush();
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armorOutputStream.close();
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}
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closed = true;
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}
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}
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