MessageEncryptionMechanism: Add factory method for SED data, toString() implementation

Author: vanitasvitae

pg/src/main/java/org/bouncycastle/openpgp/api/MessageEncryptionMechanism.java

@@ -57,6 +57,13 @@ public static MessageEncryptionMechanism unencrypted()
             SymmetricKeyAlgorithmTags.NULL, none);
     }
 
+    @Deprecated
+    public static MessageEncryptionMechanism legacyEncryptedNonIntegrityProtected(int symmetricKeyAlgorithm)
+    {
+        int none = 0;
+        return new MessageEncryptionMechanism(EncryptedDataPacketType.SED, symmetricKeyAlgorithm, none);
+    }
+
     /**
      * The data will be encrypted and integrity protected using a SEIPDv1 packet.
      *
@@ -137,4 +144,15 @@ public boolean equals(Object obj)
             && getSymmetricKeyAlgorithm() == m.getSymmetricKeyAlgorithm()
             && getAeadAlgorithm() == m.getAeadAlgorithm();
     }
+
+    @Override
+    public String toString()
+    {
+        String out = mode.name() + "[cipher: " + symmetricKeyAlgorithm;
+        if (mode == EncryptedDataPacketType.SEIPDv2 || mode == EncryptedDataPacketType.LIBREPGP_OED)
+        {
+            out += " aead: " + aeadAlgorithm;
+        }
+        return out + "]";
+    }
 }