1 files changed, 54 insertions, 0 deletions
diff --git a/pkix/src/main/java/org/spongycastle/pkcs/PKCS8EncryptedPrivateKeyInfoBuilder.java b/pkix/src/main/java/org/spongycastle/pkcs/PKCS8EncryptedPrivateKeyInfoBuilder.java
new file mode 100644
index 00000000..3897c40a
--- /dev/null
+++ b/pkix/src/main/java/org/spongycastle/pkcs/PKCS8EncryptedPrivateKeyInfoBuilder.java
@@ -0,0 +1,54 @@
+package org.spongycastle.pkcs;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.spongycastle.asn1.pkcs.EncryptedPrivateKeyInfo;
+import org.spongycastle.asn1.pkcs.PrivateKeyInfo;
+import org.spongycastle.operator.OutputEncryptor;
+
+/**
+ * A class for creating EncryptedPrivateKeyInfo structures.
+ * <pre>
+ * EncryptedPrivateKeyInfo ::= SEQUENCE {
+ *      encryptionAlgorithm AlgorithmIdentifier {{KeyEncryptionAlgorithms}},
+ *      encryptedData EncryptedData
+ * }
+ *
+ * EncryptedData ::= OCTET STRING
+ *
+ * KeyEncryptionAlgorithms ALGORITHM-IDENTIFIER ::= {
+ *          ... -- For local profiles
+ * }
+ * </pre>
+ */
+public class PKCS8EncryptedPrivateKeyInfoBuilder
+{
+    private PrivateKeyInfo privateKeyInfo;
+
+    public PKCS8EncryptedPrivateKeyInfoBuilder(PrivateKeyInfo privateKeyInfo)
+    {
+        this.privateKeyInfo = privateKeyInfo;
+    }
+
+    public PKCS8EncryptedPrivateKeyInfo build(
+        OutputEncryptor encryptor)
+    {
+        try
+        {
+            ByteArrayOutputStream bOut = new ByteArrayOutputStream();
+            OutputStream cOut = encryptor.getOutputStream(bOut);
+
+            cOut.write(privateKeyInfo.getEncoded());
+
+            cOut.close();
+
+            return new PKCS8EncryptedPrivateKeyInfo(new EncryptedPrivateKeyInfo(encryptor.getAlgorithmIdentifier(), bOut.toByteArray()));
+        }
+        catch (IOException e)
+        {
+            throw new IllegalStateException("cannot encode privateKeyInfo");
+        }
+    }
+}