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From "Jonathan D. Knezek (JIRA)" <j...@apache.org>
Subject [jira] Created: (COUCHDB-625) Pure Erlang alternative to crypto library
Date Mon, 18 Jan 2010 03:04:54 GMT
Pure Erlang alternative to crypto library
-----------------------------------------

                 Key: COUCHDB-625
                 URL: https://issues.apache.org/jira/browse/COUCHDB-625
             Project: CouchDB
          Issue Type: Improvement
          Components: Infrastructure
            Reporter: Jonathan D. Knezek
            Priority: Minor
         Attachments: ccrypto.erl

On some platforms (in my case a SheevaPlug running on armv5te) it may be difficult or impossible
to obtain a version of Erlang built with support for the crypto standard library.  I grepped
the CouchDB source and have attempted to reproduce the used crypto calls in pure Erlang.

I have reproduced the start/0, rand_uniform/2, rand_bytes/1, sha/1, and sha_mac/2 functions,
along with test_sha/1 and test_sha_mac/1 functions to validate the pure Erlang results against
the crypto library's results.  The public non-test functions attempt to first call into crypto
if available, as it is the preferred implementation.

As I'm not familiar with the build system, app system, etc. of Erlang I am only attaching
the library implementation.  I'm sure more work would be required to fully integrate it into
CouchDB if accepted.

As far as licensing goes, SHA1 is defined in NIST FIPS 180-2 (http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf),
and according to the IETF, the patent covering the algorithm has been made royalty-free (https://datatracker.ietf.org/ipr/858).

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