Publicly available encryption source code is exempt from the ECCN[1] according to the License Exception[2], section 740.13(e), provided you notify the BIS. But do read the documents, IANAL. Interestingly, though I'm EU based, but ECCN list is literally the same over here. Have been wading through these documents countless times.

[1] http://www.bis.doc.gov/index.php/forms-documents/doc_downloa...

[2] http://www.bis.doc.gov/index.php/forms-documents/doc_downloa...