1 files changed, 46 insertions, 0 deletions
diff --git a/repackaged_platform/bcprov/src/main/java/com/android/internal/org/bouncycastle/jcajce/provider/asymmetric/dh/DHUtil.java b/repackaged_platform/bcprov/src/main/java/com/android/internal/org/bouncycastle/jcajce/provider/asymmetric/dh/DHUtil.java
new file mode 100644
index 00000000..72bd708d
--- /dev/null
+++ b/repackaged_platform/bcprov/src/main/java/com/android/internal/org/bouncycastle/jcajce/provider/asymmetric/dh/DHUtil.java
@@ -0,0 +1,46 @@
+/* GENERATED SOURCE. DO NOT MODIFY. */
+package com.android.internal.org.bouncycastle.jcajce.provider.asymmetric.dh;
+
+import java.math.BigInteger;
+
+import com.android.internal.org.bouncycastle.crypto.params.DHParameters;
+import com.android.internal.org.bouncycastle.util.Arrays;
+import com.android.internal.org.bouncycastle.util.Fingerprint;
+import com.android.internal.org.bouncycastle.util.Strings;
+
+class DHUtil
+{
+    static String privateKeyToString(String algorithm, BigInteger x, DHParameters dhParams)
+    {
+        StringBuffer buf = new StringBuffer();
+        String       nl = Strings.lineSeparator();
+
+        BigInteger y = dhParams.getG().modPow(x, dhParams.getP());
+
+        buf.append(algorithm);
+        buf.append(" Private Key [").append(generateKeyFingerprint(y, dhParams)).append("]").append(nl);
+        buf.append("              Y: ").append(y.toString(16)).append(nl);
+
+        return buf.toString();
+    }
+
+    static String publicKeyToString(String algorithm, BigInteger y, DHParameters dhParams)
+    {
+        StringBuffer buf = new StringBuffer();
+        String       nl = Strings.lineSeparator();
+
+        buf.append(algorithm);
+        buf.append(" Public Key [").append(generateKeyFingerprint(y, dhParams)).append("]").append(nl);
+        buf.append("             Y: ").append(y.toString(16)).append(nl);
+
+        return buf.toString();
+    }
+
+    private static String generateKeyFingerprint(BigInteger y, DHParameters dhParams)
+    {
+            return new Fingerprint(
+                Arrays.concatenate(
+                    y.toByteArray(),
+                    dhParams.getP().toByteArray(), dhParams.getG().toByteArray())).toString();
+    }
+}