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Verify integrity of decrypted slots and display a dialog on error

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This commit is contained in:
Alexander Bakker 2017-08-18 22:12:45 +02:00
parent 1ae9364c5e
commit 7269cc2b6a
6 changed files with 74 additions and 9 deletions
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22
app/src/main/java/me/impy/aegis/crypto/CryptoUtils.java
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@ -2,11 +2,13 @@ package me.impy.aegis.crypto;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.lang.reflect.UndeclaredThrowableException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
@ -24,10 +26,14 @@ import javax.crypto.spec.SecretKeySpec;
import org.spongycastle.crypto.generators.SCrypt;
public class CryptoUtils {
public static final String CRYPTO_HASH = "SHA-256";
public static final byte CRYPTO_HASH_SIZE = 32;
public static final String CRYPTO_CIPHER_RAW = "AES/ECB/NoPadding";
public static final byte CRYPTO_KEY_SIZE = 32;
public static final String CRYPTO_CIPHER_AEAD = "AES/GCM/NoPadding";
public static final byte CRYPTO_TAG_SIZE = 16;
public static final byte CRYPTO_KEY_SIZE = 32;
public static final byte CRYPTO_NONCE_SIZE = 12;
public static final byte CRYPTO_SALT_SIZE = 32;
@ -86,6 +92,20 @@ public class CryptoUtils {
}};
}
public static byte[] hashKey(SecretKey key) {
MessageDigest hash;
try {
hash = MessageDigest.getInstance(CRYPTO_HASH);
} catch (NoSuchAlgorithmException e) {
throw new UndeclaredThrowableException(e);
}
byte[] bytes = key.getEncoded();
hash.update(bytes);
CryptoUtils.zero(bytes);
return hash.digest();
}
public static SecretKey generateKey() throws NoSuchAlgorithmException {
KeyGenerator generator = KeyGenerator.getInstance("AES");
generator.init(CRYPTO_KEY_SIZE * 8);