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AbstractHafasClientInterfaceProvider: Derive checksum and mic/mac salts.

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This commit is contained in:
Andreas Schildbach 2019-01-05 14:21:52 +01:00
parent 2390da90d6
commit c5b140b073
10 changed files with 44 additions and 20 deletions
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19
enabler/src/de/schildbach/pte/AbstractHafasClientInterfaceProvider.java
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@ -22,6 +22,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collections;
@ -39,6 +40,9 @@ import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.json.JSONArray;
import org.json.JSONException;
@ -980,4 +984,19 @@ public abstract class AbstractHafasClientInterfaceProvider extends AbstractHafas
return earlierContext != null;
}
}
public static final byte[] decryptSalt(final String encryptedSalt, final String saltEncryptionKey) {
try {
final byte[] key = BaseEncoding.base16().lowerCase().decode(saltEncryptionKey);
checkState(key.length * 8 == 128, "encryption key must be 128 bits");
final SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
final IvParameterSpec ivParameterSpec = new IvParameterSpec(new byte[16]);
final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secretKey, ivParameterSpec);
return cipher.doFinal(BaseEncoding.base64().decode(encryptedSalt));
} catch (final GeneralSecurityException x) {
// should not happen
throw new RuntimeException(x);
}
}
}