1 files changed, 65 insertions, 0 deletions
diff --git a/libraries/spongycastle/pkix/src/main/java/org/spongycastle/operator/jcajce/JceSymmetricKeyUnwrapper.java b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/operator/jcajce/JceSymmetricKeyUnwrapper.java
new file mode 100644
index 000000000..74ab54167
--- /dev/null
+++ b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/operator/jcajce/JceSymmetricKeyUnwrapper.java
@@ -0,0 +1,65 @@
+package org.spongycastle.operator.jcajce;
+
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.Provider;
+
+import javax.crypto.Cipher;
+import javax.crypto.SecretKey;
+
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.jcajce.DefaultJcaJceHelper;
+import org.spongycastle.jcajce.NamedJcaJceHelper;
+import org.spongycastle.jcajce.ProviderJcaJceHelper;
+import org.spongycastle.operator.GenericKey;
+import org.spongycastle.operator.OperatorException;
+import org.spongycastle.operator.SymmetricKeyUnwrapper;
+
+public class JceSymmetricKeyUnwrapper
+    extends SymmetricKeyUnwrapper
+{
+    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
+    private SecretKey secretKey;
+
+    public JceSymmetricKeyUnwrapper(AlgorithmIdentifier algorithmIdentifier, SecretKey secretKey)
+    {
+        super(algorithmIdentifier);
+
+        this.secretKey = secretKey;
+    }
+
+    public JceSymmetricKeyUnwrapper setProvider(Provider provider)
+    {
+        this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
+
+        return this;
+    }
+
+    public JceSymmetricKeyUnwrapper setProvider(String providerName)
+    {
+        this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
+
+        return this;
+    }
+
+    public GenericKey generateUnwrappedKey(AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedKey)
+        throws OperatorException
+    {
+        try
+        {
+            Cipher keyCipher = helper.createSymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm());
+
+            keyCipher.init(Cipher.UNWRAP_MODE, secretKey);
+
+            return new JceGenericKey(encryptedKeyAlgorithm, keyCipher.unwrap(encryptedKey, helper.getKeyAlgorithmName(encryptedKeyAlgorithm.getAlgorithm()), Cipher.SECRET_KEY));
+        }
+        catch (InvalidKeyException e)
+        {
+            throw new OperatorException("key invalid in message.", e);
+        }
+        catch (NoSuchAlgorithmException e)
+        {
+            throw new OperatorException("can't find algorithm.", e);
+        }
+    }
+}