119 lines
2.5 KiB
Python
119 lines
2.5 KiB
Python
#
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# Purpose: Write 2 new JPG image files => PicSeal JPG Files
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#
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# Data: public key, private key, image hash, image signature
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# Has: JPG fingerprint
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#
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# Big-endian
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# Pub: [app15:2|size:2|'picseal':7|type:1|sig:512|pubkey:550]
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# Pvt: [app15:2|size:2|'picseal':7|type:1|sig:512|pvtkey:2347]
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#
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import struct
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import logging
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from Crypto.PublicKey import RSA
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from libs.crypto_sig import Signature
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class JpgPicSeal:
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app15_marker = b'\xff\xef'
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# ascii code for "picseal"
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picseal_marker = b'\x70\x69\x63\x73\x65\x61\x6C'
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pub_marker = b'\x01'
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pvt_marker = b'\x02'
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def __init__(self):
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pass
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#
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# READ
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#
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def isPicSeal(buf):
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if (buf == JpgPicSeal.picseal_marker):
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return True
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return False
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#
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# [size:2|picseal:7|type:1|sig:512|key:550] == 1072
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#
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def deserialize(buf):
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sig = Signature()
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retval = False
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# read type 0x01 is public key, 0x02 private key
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try:
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if (buf[9] == ord(JpgPicSeal.pub_marker)):
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sig.importPubKey(buf[522:])
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print("*** *** ***")
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print("*** Public Key Import Sucessful")
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print("*** *** ***")
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else:
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sig.importPvtKey(buf[522:])
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print("*** *** ***")
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print("*** Private Key Import Sucessful")
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print("*** *** ***")
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return sig
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except Exception as ex:
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logging.debug(ex)
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return None
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#
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def readPub(self):
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pass
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def readPvt(self):
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pass
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#
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# WRITE
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#
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#
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def serilize(fname):
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pass
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#
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# input is the Crypto Sig class
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#
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def writePub(fhw, sig):
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JpgPicSeal.__writeData(fhw, sig.sig_data, sig.getPubKeyDER(), JpgPicSeal.pub_marker)
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#
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# input is the Crypto Sig class
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#
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def writePvt(fhw, sig):
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JpgPicSeal.__writeData(fhw, sig.sig_data, sig.getPvtKeyDER(), JpgPicSeal.pvt_marker)
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#
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def __writeData(fhw, sig_data, keyder, pubpvt):
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# must include 2 bytes for length too, plus 1 for the key type
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size = 3
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size += len(JpgPicSeal.picseal_marker)
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size += len(sig_data)
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size += len(keyder)
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logging.debug("3+{}+{}+{}=={} | picseal, sig, key".format(str(len(JpgPicSeal.picseal_marker)), str(len(sig_data)), str(len(keyder)), str(size) ))
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#
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# write header
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# write app marker
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fhw.write(JpgPicSeal.app15_marker)
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# write the size of picseal record
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fhw.write(size.to_bytes(2, byteorder='big'))
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#
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# write picseal data
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# write picseal marker
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fhw.write(JpgPicSeal.picseal_marker)
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fhw.write(pubpvt)
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# write signature of image
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fhw.write(sig_data)
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# write the key data
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fhw.write(keyder)
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