58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
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"""Decrypt a single blob"""
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import argparse
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import binascii
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import logging
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import os
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import sys
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from twisted.internet import defer
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from twisted.internet import reactor
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from lbrynet import conf
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from lbrynet.cryptstream import CryptBlob
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from lbrynet.core import HashBlob
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from lbrynet.core import log_support
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log = logging.getLogger('decrypt_blob')
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def main():
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conf.initialize_settings()
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parser = argparse.ArgumentParser()
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parser.add_argument('blob_file')
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parser.add_argument('hex_key')
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parser.add_argument('hex_iv')
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parser.add_argument('output')
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args = parser.parse_args()
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log_support.configure_console()
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d = run(args)
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reactor.run()
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@defer.inlineCallbacks
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def run(args):
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try:
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yield decrypt_blob(args.blob_file, args.hex_key, args.hex_iv, args.output)
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except Exception:
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log.exception('Failed to decrypt blob')
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finally:
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reactor.callLater(0, reactor.stop)
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@defer.inlineCallbacks
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def decrypt_blob(blob_file, key, iv, output):
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filename = os.path.abspath(blob_file)
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length = os.path.getsize(filename)
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directory, blob_hash = os.path.split(filename)
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blob = HashBlob.BlobFile(directory, blob_hash, True, length)
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decryptor = CryptBlob.StreamBlobDecryptor(
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blob, binascii.unhexlify(key), binascii.unhexlify(iv), length)
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with open(output, 'w') as f:
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yield decryptor.decrypt(f.write)
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if __name__ == '__main__':
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sys.exit(main())
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