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session-android
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Synchronize all Cipher#doFinal

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pull/1176/head
andrew 2 years ago
parent 99cb10f5be
commit d3ce899a80
8 changed files with 75 additions and 96 deletions
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35
app/src/main/java/org/thoughtcrime/securesms/backup/FullBackupExporter.kt
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@ -14,6 +14,7 @@ import org.session.libsession.avatars.AvatarHelper
import org.session.libsession.messaging.sending_receiving.attachments.AttachmentId
import org.session.libsession.utilities.Conversions
import org.session.libsession.utilities.Util
import org.session.libsignal.crypto.CipherUtil.CIPHER_LOCK
import org.session.libsignal.crypto.kdf.HKDFv3
import org.session.libsignal.utilities.ByteUtil
import org.session.libsignal.utilities.Log
@ -289,7 +290,7 @@ object FullBackupExporter {
private var counter: Int = 0
constructor(outputStream: OutputStream, passphrase: String) : super() {
private constructor(outputStream: OutputStream, passphrase: String) : super() {
try {
val salt = Util.getSecretBytes(32)
val key = BackupUtil.computeBackupKey(passphrase, salt)
@ -381,18 +382,24 @@ object FullBackupExporter {
private fun writeStream(inputStream: InputStream) {
try {
Conversions.intToByteArray(iv, 0, counter++)
cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(cipherKey, "AES"), IvParameterSpec(iv))
mac.update(iv)
val buffer = ByteArray(8192)
var read: Int
while (inputStream.read(buffer).also { read = it } != -1) {
val ciphertext = cipher.update(buffer, 0, read)
if (ciphertext != null) {
outputStream.write(ciphertext)
mac.update(ciphertext)
val remainder = synchronized(CIPHER_LOCK) {
cipher.init(
Cipher.ENCRYPT_MODE,
SecretKeySpec(cipherKey, "AES"),
IvParameterSpec(iv)
)
mac.update(iv)
val buffer = ByteArray(8192)
var read: Int
while (inputStream.read(buffer).also { read = it } != -1) {
val ciphertext = cipher.update(buffer, 0, read)
if (ciphertext != null) {
outputStream.write(ciphertext)
mac.update(ciphertext)
}
}
cipher.doFinal()
}
val remainder = cipher.doFinal()
outputStream.write(remainder)
mac.update(remainder)
val attachmentDigest = mac.doFinal()
@ -414,8 +421,10 @@ object FullBackupExporter {
private fun write(out: OutputStream, frame: BackupFrame) {
try {
Conversions.intToByteArray(iv, 0, counter++)
cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(cipherKey, "AES"), IvParameterSpec(iv))
val frameCiphertext = cipher.doFinal(frame.toByteArray())
val frameCiphertext = synchronized(CIPHER_LOCK) {
cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(cipherKey, "AES"), IvParameterSpec(iv))
cipher.doFinal(frame.toByteArray())
}
val frameMac = mac.doFinal(frameCiphertext)
val length = Conversions.intToByteArray(frameCiphertext.size + 10)
out.write(length)

17
libsession/src/main/java/org/session/libsession/utilities/AESGCM.kt
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@ -1,6 +1,7 @@
package org.session.libsession.utilities
import androidx.annotation.WorkerThread
import org.session.libsignal.crypto.CipherUtil.CIPHER_LOCK
import org.session.libsignal.utilities.ByteUtil
import org.session.libsignal.utilities.Util
import org.session.libsignal.utilities.Hex
@ -27,9 +28,11 @@ internal object AESGCM {
internal fun decrypt(ivAndCiphertext: ByteArray, symmetricKey: ByteArray): ByteArray {
val iv = ivAndCiphertext.sliceArray(0 until ivSize)
val ciphertext = ivAndCiphertext.sliceArray(ivSize until ivAndCiphertext.count())
val cipher = Cipher.getInstance("AES/GCM/NoPadding")
cipher.init(Cipher.DECRYPT_MODE, SecretKeySpec(symmetricKey, "AES"), GCMParameterSpec(gcmTagSize, iv))
return cipher.doFinal(ciphertext)
synchronized(CIPHER_LOCK) {
val cipher = Cipher.getInstance("AES/GCM/NoPadding")
cipher.init(Cipher.DECRYPT_MODE, SecretKeySpec(symmetricKey, "AES"), GCMParameterSpec(gcmTagSize, iv))
return cipher.doFinal(ciphertext)
}
}
/**
@ -47,9 +50,11 @@ internal object AESGCM {
*/
internal fun encrypt(plaintext: ByteArray, symmetricKey: ByteArray): ByteArray {
val iv = Util.getSecretBytes(ivSize)
val cipher = Cipher.getInstance("AES/GCM/NoPadding")
cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(symmetricKey, "AES"), GCMParameterSpec(gcmTagSize, iv))
return ByteUtil.combine(iv, cipher.doFinal(plaintext))
synchronized(CIPHER_LOCK) {
val cipher = Cipher.getInstance("AES/GCM/NoPadding")
cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(symmetricKey, "AES"), GCMParameterSpec(gcmTagSize, iv))
return ByteUtil.combine(iv, cipher.doFinal(plaintext))
}
}
/**

5
libsignal/src/main/java/org/session/libsignal/crypto/CipherUtil.java
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@ -0,0 +1,5 @@
package org.session.libsignal.crypto;
public class CipherUtil {
public static final Object CIPHER_LOCK = new Object();
}

45
libsignal/src/main/java/org/session/libsignal/crypto/DiffieHellman.kt
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@ -1,45 +0,0 @@
package org.session.libsignal.crypto
import org.whispersystems.curve25519.Curve25519
import org.session.libsignal.utilities.Util
import javax.crypto.Cipher
import javax.crypto.spec.IvParameterSpec
import javax.crypto.spec.SecretKeySpec
object DiffieHellman {
private val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
private val curve = Curve25519.getInstance(Curve25519.BEST)
private val ivSize = 16
@JvmStatic @Throws
fun encrypt(plaintext: ByteArray, symmetricKey: ByteArray): ByteArray {
val iv = Util.getSecretBytes(ivSize)
val ivSpec = IvParameterSpec(iv)
val secretKeySpec = SecretKeySpec(symmetricKey, "AES")
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivSpec)
val ciphertext = cipher.doFinal(plaintext)
return iv + ciphertext
}
@JvmStatic @Throws
fun encrypt(plaintext: ByteArray, publicKey: ByteArray, privateKey: ByteArray): ByteArray {
val symmetricKey = curve.calculateAgreement(publicKey, privateKey)
return encrypt(plaintext, symmetricKey)
}
@JvmStatic @Throws
fun decrypt(ivAndCiphertext: ByteArray, symmetricKey: ByteArray): ByteArray {
val iv = ivAndCiphertext.sliceArray(0 until ivSize)
val ciphertext = ivAndCiphertext.sliceArray(ivSize until ivAndCiphertext.size)
val ivSpec = IvParameterSpec(iv)
val secretKeySpec = SecretKeySpec(symmetricKey, "AES")
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivSpec)
return cipher.doFinal(ciphertext)
}
@JvmStatic @Throws
fun decrypt(ivAndCiphertext: ByteArray, publicKey: ByteArray, privateKey: ByteArray): ByteArray {
val symmetricKey = curve.calculateAgreement(publicKey, privateKey)
return decrypt(ivAndCiphertext, symmetricKey)
}
}

8
libsignal/src/main/java/org/session/libsignal/crypto/kdf/HKDF.java
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@ -39,9 +39,7 @@ public abstract class HKDF {
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(new SecretKeySpec(salt, "HmacSHA256"));
return mac.doFinal(inputKeyMaterial);
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (InvalidKeyException e) {
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
throw new AssertionError(e);
}
}
@ -73,9 +71,7 @@ public abstract class HKDF {
}
return results.toByteArray();
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (InvalidKeyException e) {
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
throw new AssertionError(e);
}
}

15
libsignal/src/main/java/org/session/libsignal/streams/AttachmentCipherOutputStream.java
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@ -6,6 +6,8 @@
package org.session.libsignal.streams;
import static org.session.libsignal.crypto.CipherUtil.CIPHER_LOCK;
import org.session.libsignal.utilities.Util;
import java.io.IOException;
@ -68,16 +70,17 @@ public class AttachmentCipherOutputStream extends DigestingOutputStream {
@Override
public void flush() throws IOException {
try {
byte[] ciphertext = cipher.doFinal();
byte[] ciphertext;
synchronized (CIPHER_LOCK) {
ciphertext = cipher.doFinal();
}
byte[] auth = mac.doFinal(ciphertext);
super.write(ciphertext);
super.write(auth);
super.flush();
} catch (IllegalBlockSizeException e) {
throw new AssertionError(e);
} catch (BadPaddingException e) {
} catch (IllegalBlockSizeException | BadPaddingException e) {
throw new AssertionError(e);
}
}
@ -97,9 +100,7 @@ public class AttachmentCipherOutputStream extends DigestingOutputStream {
private Cipher initializeCipher() {
try {
return Cipher.getInstance("AES/CBC/PKCS5Padding");
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (NoSuchPaddingException e) {
} catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
throw new AssertionError(e);
}
}

30
libsignal/src/main/java/org/session/libsignal/streams/ProfileCipherInputStream.java
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@ -1,5 +1,7 @@
package org.session.libsignal.streams;
import static org.session.libsignal.crypto.CipherUtil.CIPHER_LOCK;
import org.session.libsignal.utilities.Util;
import java.io.FilterInputStream;
@ -62,23 +64,23 @@ public class ProfileCipherInputStream extends FilterInputStream {
byte[] ciphertext = new byte[outputLength / 2];
int read = in.read(ciphertext, 0, ciphertext.length);
if (read == -1) {
if (cipher.getOutputSize(0) > outputLength) {
throw new AssertionError("Need: " + cipher.getOutputSize(0) + " but only have: " + outputLength);
}
synchronized (CIPHER_LOCK) {
if (read == -1) {
if (cipher.getOutputSize(0) > outputLength) {
throw new AssertionError("Need: " + cipher.getOutputSize(0) + " but only have: " + outputLength);
}
finished = true;
return cipher.doFinal(output, outputOffset);
} else {
if (cipher.getOutputSize(read) > outputLength) {
throw new AssertionError("Need: " + cipher.getOutputSize(read) + " but only have: " + outputLength);
}
finished = true;
return cipher.doFinal(output, outputOffset);
} else {
if (cipher.getOutputSize(read) > outputLength) {
throw new AssertionError("Need: " + cipher.getOutputSize(read) + " but only have: " + outputLength);
}
return cipher.update(ciphertext, 0, read, output, outputOffset);
return cipher.update(ciphertext, 0, read, output, outputOffset);
}
}
} catch (IllegalBlockSizeException e) {
throw new AssertionError(e);
} catch(ShortBufferException e) {
} catch (IllegalBlockSizeException | ShortBufferException e) {
throw new AssertionError(e);
} catch (BadPaddingException e) {
throw new IOException(e);

16
libsignal/src/main/java/org/session/libsignal/streams/ProfileCipherOutputStream.java
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@ -1,5 +1,7 @@
package org.session.libsignal.streams;
import static org.session.libsignal.crypto.CipherUtil.CIPHER_LOCK;
import java.io.IOException;
import java.io.OutputStream;
import java.security.InvalidAlgorithmParameterException;
@ -54,20 +56,24 @@ public class ProfileCipherOutputStream extends DigestingOutputStream {
byte[] input = new byte[1];
input[0] = (byte)b;
byte[] output = cipher.update(input);
byte[] output;
synchronized (CIPHER_LOCK) {
output = cipher.update(input);
}
super.write(output);
}
@Override
public void flush() throws IOException {
try {
byte[] output = cipher.doFinal();
byte[] output;
synchronized (CIPHER_LOCK) {
output = cipher.doFinal();
}
super.write(output);
super.flush();
} catch (BadPaddingException e) {
throw new AssertionError(e);
} catch (IllegalBlockSizeException e) {
} catch (BadPaddingException | IllegalBlockSizeException e) {
throw new AssertionError(e);
}
}

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