Basic PKCS5 support in JRuby

pkcs5.rb

require 'java'

module OpenSSL
  class PKCS5
		java_import org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator
		java_import org.bouncycastle.crypto.digests.SHA1Digest

		# it should probably support a non-bouncy-castle-digest as its 5th param, but nevermind
		def self.pbkdf2_hmac(pass, salt, iter, keylen, digest)
			generator = PKCS5S2ParametersGenerator.new
			generator.init(pass.to_java_bytes, salt.to_java_bytes, iter)
			parameters = generator.generateDerivedMacParameters(keylen*8)
			String.from_java_bytes(parameters.getKey())
		end

		def self.pbkdf2_hmac_sha1(pass, salt, iter, keylen)
			digest = SHA1Digest.new
			pbkdf2_hmac(pass, salt, iter, keylen, digest)
		end
	end
end

Milgner - this really saved me thank you. Some tags to light the way.

jruby rails4 heroku jruby-1.7.1 uninitialized constant OpenSSL::PKCS5

had to add these two gems to the gemfile:

gem 'bouncy-castle-java'
gem 'jruby-openssl'