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We can change the preferred symmetric encryption algorithm (cypher) used by DidiSoft OpenPGP Library for .NET through the Cypher property of the class PGPLib . By default CAST 5 is used.

Have in mind that although you have changed this property, the library will ignore it if the public key used for encryption does not list this algorithm in it’s preferred cyphers list (each OpenPGP public key holds such an information internally in a special signature). In that case the library will automatically pick the first algorithm from the public key list.

Below is a list of the supported symmetric key algorithms:

CypherAlgorithm.TRIPLE_DES
CypherAlgorithm.CAST5
CypherAlgorithm.BLOWFISH
CypherAlgorithm.AES_128
CypherAlgorithm.AES_192
CypherAlgorithm.AES_256
CypherAlgorithm.TWOFISH
CypherAlgorithm.DES
CypherAlgorithm.SAFER
CypherAlgorithm.IDEA

Commercial usage of IDEA requires licensing from MediaCrypt (US patent expiring January 7, 2012)

The example below demonstrates how to set explicitly a preferred symmetric encryption algorithm for an instance of the library:

C#

PGPLib pgp = new PGPLib();
pgp.Cypher = CypherAlgorithm.AES_128;

VB.NET

Dim pgp As New PGPLib()
pgp.Cypher = CypherAlgorithm.AES_128

The change has effect only on the current instance of the library and will have effect on subsequent calls to all Encrypt and SignAndEncrypt methods.

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