Module use

#!/usr/bin/env python

from LRSignature.sign.Sign  import Sign_0_21
from LRSignature.verify.Verify  import Verify_0_21
import simplejson as json

envelope = '''
        {
            "_id":"00e3f67232e743b6bc2a079bd98ff55a",
            "_rev":"1-8163d32f6cc9996f2b7228d8b5db7962",
            "doc_type":"resource_data",
            "update_timestamp":"2011-03-14 13:36:04.617999",
            "resource_data":"<oai_dc:dc xmlns:oai_dc=\\"http://www.openarchives.org/OAI/2.0/oai_dc/\\" xmlns:dc=\\"http://purl.org/dc/elements/1.1/\\" xmlns:xsi=\\"http://www.w3.org/2001/XMLSchema-instance\\" xmlns=\\"http://www.openarchives.org/OAI/2.0/\\" xsi:schemaLocation=\\"http://www.openarchives.org/OAI/2.0/oai_dc/                          http://www.openarchives.org/OAI/2.0/oai_dc.xsd\\">\\n<dc:title>A chat about America. October and November, 1884.</dc:title>\\n<dc:creator>J. P.</dc:creator>\\n<dc:subject>United States--Description and travel.</dc:subject>\\n<dc:description>\\"Printed for private circulation only.\\"</dc:description>\\n<dc:description>Electronic reproduction. Washington, D.C. : Library of Congress, [2002-2003]</dc:description>\\n<dc:publisher>Manchester, Palmer &amp; Howe</dc:publisher>\\n<dc:date>1885</dc:date>\\n<dc:type>text</dc:type>\\n<dc:identifier>http://hdl.loc.gov/loc.gdc/lhbtn.12281</dc:identifier>\\n<dc:language>eng</dc:language>\\n<dc:coverage>United States</dc:coverage>\\n</oai_dc:dc>\\n      ",
            "keys":["United States--Description and travel.","eng"],
            "submitter_type":"agent",
            "resource_data_type":"metadata",
            "payload_schema_locator":"http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd",
            "payload_placement":"inline",
            "submitter":"NSDL 2 LR Data Pump",
            "payload_schema":["oai_dc"],
            "node_timestamp":"2011-03-14 13:36:04.617999",
            "doc_version":"0.10.0",
            "create_timestamp":"2011-03-14 13:36:04.617999",
            "active":true,
            "publishing_node":"string",
            "resource_locator":"http://hdl.loc.gov/loc.gdc/lhbtn.12281",
            "doc_ID":"00e3f67232e743b6bc2a079bd98ff55a",
            "TOS": {
                "submission_TOS": "http://example.com/tos/unknown",
                "submission_attribution": "unidentified"
            }
        }
        '''
origJson = json.loads(envelope)
privateKeyLocation = ["http://www.example.com/example.asc"]
keyid = "C37C805D164B052C"
passphrase = "my passphrase"

signtool = Sign_0_21(keyid, passphrase=passphrase, publicKeyLocations=privateKeyLocation)
signed = signtool.sign(origJson)

verifytool = Verify_0_21()
verified = verifytool.verify(signed)
assert verified == True

LRSignature.util module contains functionality to fetch and store public keys into the local PGP keyring.