android - Use m2crypto to print certificate in apk -


i show android apk certificate information openssl command does. like

$ openssl pkcs7 -inform der -in cert.rsa -print_certs subject=... -----begin certificate----- miiebzccau+gawibagiekkpncjanbgkqhkig9w0baqsfadcbsjepma0ga1uebhmg ... 5be3oowpt+mhkewxsei9r+s7tuwkp+wopjevmbmga1uecgwm6yer5bgx572r57uc -----end certificate-----

at first used pycrypto, found not include x509 format. after trying m2crypto, output error like

in [7]: x509.load_cert('cert.rsa', x509.format_der) --------------------------------------------------------------------------- x509error                                 traceback (most recent call last) <ipython-input-7-821a670a1ab6> in <module>() ----> 1 x509.load_cert('cert.rsa', x509.format_der)  /usr/local/lib/python2.7/dist-packages/m2crypto/x509.pyc in load_cert(file, format)     613         cptr = m2.d2i_x509(bio._ptr())     614         if cptr none: --> 615             raise x509error(err.get_error())     616         return x509(cptr, _pyfree=1)     617     else:  x509error: 140335753901888:error:0d0680a8:asn1 encoding routines:asn1_check_tlen:wrong tag:tasn_dec.c:1337: 140335753901888:error:0d07803a:asn1 encoding routines:asn1_item_ex_d2i:nested asn1 error:tasn_dec.c:388:type=x509_cinf 140335753901888:error:0d08303a:asn1 encoding routines:asn1_template_noexp_d2i:nested asn1 error:tasn_dec.c:769:field=cert_info, type=x509

what correct way show base64-encoded certificate?

inspired pkcs7dump.py use pyasn1 , pyasn1_modules show base64-encoded certificate extracting file in pkcs#7(rfc2315) format.

following simple script

from pyasn1.codec.der import decoder, encoder pyasn1_modules import rfc2315  contentinfo, _ = decoder.decode(open('cert.rsa', 'rb').read(), asn1spec=rfc2315.contentinfo()) content = contentinfo.getcomponentbyname('content') signeddata, _ = decoder.decode(content, asn1spec=rfc2315.signeddata()) certs = signeddata.getcomponentbyname('certificates') cert = certs.getcomponentbyposition(0) print encoder.encode(cert).encode('base64')

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