Add software implementatino of SHA512 as fallback option

dufkan · Jul 20, 2021 · 70e5f65 · 70e5f65
1 parent 20018eb
commit 70e5f65
Show file tree

Hide file tree

Showing 2 changed files with 782 additions and 1 deletion.
diff --git a/applet/src/main/java/applet/MainApplet.java b/applet/src/main/java/applet/MainApplet.java
@@ -3,6 +3,7 @@
 import javacard.framework.*;
 import javacard.security.*;
 import applet.jcmathlib.*;
+import applet.swalgs.*;
 
 public class MainApplet extends Applet implements MultiSelectable {
  private ECConfig ecc;
@@ -15,7 +16,7 @@ public class MainApplet extends Applet implements MultiSelectable {
  private byte[] prefix = new byte[32];
  private byte[] publicKey = new byte[32];
 
- private MessageDigest hasher = MessageDigest.getInstance(MessageDigest.ALG_SHA_512, false);
+ private MessageDigest hasher;
 
  private byte[] ramArray = JCSystem.makeTransientByteArray(Wei25519.POINT_SIZE, JCSystem.CLEAR_ON_DESELECT);
  private RandomData random = RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);
@@ -28,6 +29,12 @@ public MainApplet(byte[] buffer, short offset, byte length) {
  OperationSupport os = OperationSupport.getInstance();
  os.setCard(OperationSupport.SIMULATOR);
 
+ try {
+ hasher = MessageDigest.getInstance(MessageDigest.ALG_SHA_512, false);
+ } catch (CryptoException e) {
+ hasher = new Sha2(Sha2.SHA_512);
+ }
+
  ecc = new ECConfig((short) 256);
 
  privateKey = new Bignat((short) 32, JCSystem.MEMORY_TYPE_PERSISTENT, ecc.bnh);