1 files changed, 45 insertions, 0 deletions
diff --git a/pkix/src/main/java/org/spongycastle/cms/bc/BcPasswordRecipientInfoGenerator.java b/pkix/src/main/java/org/spongycastle/cms/bc/BcPasswordRecipientInfoGenerator.java
new file mode 100644
index 00000000..4ea5cdfd
--- /dev/null
+++ b/pkix/src/main/java/org/spongycastle/cms/bc/BcPasswordRecipientInfoGenerator.java
@@ -0,0 +1,45 @@
+package org.spongycastle.cms.bc;
+
+import org.spongycastle.asn1.ASN1ObjectIdentifier;
+import org.spongycastle.asn1.ASN1OctetString;
+import org.spongycastle.asn1.pkcs.PBKDF2Params;
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.cms.CMSException;
+import org.spongycastle.cms.PasswordRecipientInfoGenerator;
+import org.spongycastle.crypto.Wrapper;
+import org.spongycastle.crypto.generators.PKCS5S2ParametersGenerator;
+import org.spongycastle.crypto.params.KeyParameter;
+import org.spongycastle.crypto.params.ParametersWithIV;
+import org.spongycastle.operator.GenericKey;
+
+public class BcPasswordRecipientInfoGenerator
+    extends PasswordRecipientInfoGenerator
+{
+    public BcPasswordRecipientInfoGenerator(ASN1ObjectIdentifier kekAlgorithm, char[] password)
+    {
+        super(kekAlgorithm, password);
+    }
+
+    protected byte[] calculateDerivedKey(byte[] encodedPassword, AlgorithmIdentifier derivationAlgorithm, int keySize)
+        throws CMSException
+    {
+        PBKDF2Params params = PBKDF2Params.getInstance(derivationAlgorithm.getParameters());
+
+        PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator();
+
+        gen.init(encodedPassword, params.getSalt(), params.getIterationCount().intValue());
+
+        return ((KeyParameter)gen.generateDerivedParameters(keySize)).getKey();
+    }
+
+    public byte[] generateEncryptedBytes(AlgorithmIdentifier keyEncryptionAlgorithm, byte[] derivedKey, GenericKey contentEncryptionKey)
+        throws CMSException
+    {
+        byte[] contentEncryptionKeySpec = ((KeyParameter)CMSUtils.getBcKey(contentEncryptionKey)).getKey();
+        Wrapper keyEncryptionCipher = EnvelopedDataHelper.createRFC3211Wrapper(keyEncryptionAlgorithm.getAlgorithm());
+
+        keyEncryptionCipher.init(true, new ParametersWithIV(new KeyParameter(derivedKey), ASN1OctetString.getInstance(keyEncryptionAlgorithm.getParameters()).getOctets()));
+
+        return keyEncryptionCipher.wrap(contentEncryptionKeySpec, 0, contentEncryptionKeySpec.length);
+    }
+}