Switch to updated Curve25519 dependency.

build.gradle

@@ -1,21 +1,7 @@
-buildscript {
-    dependencies {
-        classpath files('libs/gradle-witness.jar')
-    }
-}
-
 subprojects {
-    apply plugin: 'witness'
-
     ext.version_number     = "1.0.1"
     ext.group_info         = "org.whispersystems"
-    ext.curve25519_version = "0.1.3"
+    ext.curve25519_version = "0.2.1"
-
-    dependencyVerification {
-        verify = [
-          'com.google.protobuf:protobuf-java:e0c1c64575c005601725e7c6a02cebf9e1285e888f756b2a1d73ffa8d725cc74',
-        ]
-    }
 
     if (JavaVersion.current().isJava8Compatible()) {
         allprojects {

java/src/main/java/org/whispersystems/libaxolotl/ecc/Curve.java

@@ -16,24 +16,23 @@
  */
 package org.whispersystems.libaxolotl.ecc;
 
-import org.whispersystems.curve25519.Curve25519KeyPair;
-import org.whispersystems.libaxolotl.InvalidKeyException;
 import org.whispersystems.curve25519.Curve25519;
+import org.whispersystems.curve25519.Curve25519KeyPair;
+import org.whispersystems.curve25519.NoSuchProviderException;
+import org.whispersystems.libaxolotl.InvalidKeyException;
 
-import java.security.NoSuchAlgorithmException;
+import static org.whispersystems.curve25519.Curve25519.BEST;
-import java.security.SecureRandom;
 
 public class Curve {
 
   public  static final int DJB_TYPE   = 0x05;
 
   public static boolean isNative() {
-    return Curve25519.isNative();
+    return Curve25519.getInstance(BEST).isNative();
   }
 
   public static ECKeyPair generateKeyPair() {
-    SecureRandom      secureRandom = getSecureRandom();
+    Curve25519KeyPair keyPair = Curve25519.getInstance(BEST).generateKeyPair();
-    Curve25519KeyPair keyPair      = Curve25519.generateKeyPair(secureRandom);
 
     return new ECKeyPair(new DjbECPublicKey(keyPair.getPublicKey()),
                          new DjbECPrivateKey(keyPair.getPrivateKey()));
@@ -66,7 +65,8 @@ public class Curve {
     }
 
     if (publicKey.getType() == DJB_TYPE) {
-      return Curve25519.calculateAgreement(((DjbECPublicKey)publicKey).getPublicKey(),
+      return Curve25519.getInstance(BEST)
+                       .calculateAgreement(((DjbECPublicKey) publicKey).getPublicKey(),
                                            ((DjbECPrivateKey) privateKey).getPrivateKey());
     } else {
       throw new InvalidKeyException("Unknown type: " + publicKey.getType());
@@ -77,7 +77,8 @@ public class Curve {
       throws InvalidKeyException
   {
     if (signingKey.getType() == DJB_TYPE) {
-      return Curve25519.verifySignature(((DjbECPublicKey)signingKey).getPublicKey(), message, signature);
+      return Curve25519.getInstance(BEST)
+                       .verifySignature(((DjbECPublicKey) signingKey).getPublicKey(), message, signature);
     } else {
       throw new InvalidKeyException("Unknown type: " + signingKey.getType());
     }
@@ -87,17 +88,10 @@ public class Curve {
       throws InvalidKeyException
   {
     if (signingKey.getType() == DJB_TYPE) {
-      return Curve25519.calculateSignature(getSecureRandom(), ((DjbECPrivateKey)signingKey).getPrivateKey(), message);
+      return Curve25519.getInstance(BEST)
+                       .calculateSignature(((DjbECPrivateKey) signingKey).getPrivateKey(), message);
     } else {
       throw new InvalidKeyException("Unknown type: " + signingKey.getType());
     }
   }
-
-  private static SecureRandom getSecureRandom() {
-    try {
-      return SecureRandom.getInstance("SHA1PRNG");
-    } catch (NoSuchAlgorithmException e) {
-      throw new AssertionError(e);
-    }
-  }
 }