MD5 Digest

I've just finished a Curl implementation of the MD5 hash function - used by the Flickr api for creating the signature for a call. This replaces the previously lamented dll implementation, and makes the Curlr api an all-Curl affair; so now the only reason the Flickr apps need to be granted privilege is the absence of a curl-access.txt file on their server. I'm working on that.

The code is to be found in the curlr repository which is open for downloads - but not yet for modification of the source. The source is a little rough, but it passes the basic set of tests, and my Flickr api seems to work correctly when using it. You can try it out (if creating MD5 hashes is your idea of fun) here.

The MD5 code is probably more widely useful than in just the Flickr api, so it resides in a crypto package, with the intent that other useful implementations will live there too - the package is COM.CURLR.CRYPTO. The code is an implementation of the Curl base classes MsgDigest and MsgDigester, and provides similar functions to the native SHA-1 digests. I've also included implementations of MD5-ByteOutputStream and MD5-ByteInputStream to build digests for ouput and input streams - though I've not tested these yet.

I've added a couple of utility methods, so it's simple enough to use the digest as a lower or uper-case string. Note the naming convention; class names are prefixed sad, partly to singify my authorship but mostly to distinguish these implementations from any other Curl versions.

The one issue I know of so far is that the method MD5-Digest.to-base64-String blows up becaase of a bug in the Curl base class- so don't use it, and use to-lower-String instead.