1 files changed, 33 insertions, 0 deletions
diff --git a/pkix/src/main/java/org/spongycastle/cms/bc/BcKEKRecipient.java b/pkix/src/main/java/org/spongycastle/cms/bc/BcKEKRecipient.java
new file mode 100644
index 00000000..066deaa6
--- /dev/null
+++ b/pkix/src/main/java/org/spongycastle/cms/bc/BcKEKRecipient.java
@@ -0,0 +1,33 @@
+package org.spongycastle.cms.bc;
+
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.cms.CMSException;
+import org.spongycastle.cms.KEKRecipient;
+import org.spongycastle.crypto.CipherParameters;
+import org.spongycastle.operator.OperatorException;
+import org.spongycastle.operator.SymmetricKeyUnwrapper;
+import org.spongycastle.operator.bc.BcSymmetricKeyUnwrapper;
+
+public abstract class BcKEKRecipient
+    implements KEKRecipient
+{
+    private SymmetricKeyUnwrapper unwrapper;
+
+    public BcKEKRecipient(BcSymmetricKeyUnwrapper unwrapper)
+    {
+        this.unwrapper = unwrapper;
+    }
+
+    protected CipherParameters extractSecretKey(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
+        throws CMSException
+    {
+        try
+        {
+            return CMSUtils.getBcKey(unwrapper.generateUnwrappedKey(contentEncryptionAlgorithm, encryptedContentEncryptionKey));
+        }
+        catch (OperatorException e)
+        {
+            throw new CMSException("exception unwrapping key: " + e.getMessage(), e);
+        }
+    }
+}