Update to Portable.BouncyCastle

Merge pull request #31 from mattosaurus/development

Switch to Portable.BouncyCastle

Add verification against sub-keys

v1.7.0

Add additional verification tests

Add Sign method and allow verification of unencrypted files

v1.6.0

Remove old test files

Add verify method

Merge pull request #24 from mattosaurus/development

Add Verify method and unit tests

Enable multikey support

v1.4.1

Update version

Multiple key encrypt and sign

Add method to allow encrypt and sign with multiple public keys

ReadPublicKey moved to Utilities

Merge pull request #13 from mattosaurus/development

ReadPublicKey moved to Utilities

Allow encryption with multiple keys

Allow encryption with multiple keys