x509.py 文件源码

def dumpasn1(self):
    """
    Pretty print an ASN.1 DER object using cryptlib dumpasn1 tool.
    Use a temporary file rather than popen4() because dumpasn1 uses
    seek() when decoding ASN.1 content nested in OCTET STRING values.
    """

    ret = None
    fn = "dumpasn1.%d.tmp" % os.getpid()
    try:
      f = open(fn, "wb")
      f.write(self.get_DER())
      f.close()
      p = subprocess.Popen(("dumpasn1", "-a", fn), stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
      ret = "\n".join(x for x in p.communicate()[0].splitlines() if x.startswith(" "))
    except Exception, e:
      ret = "[Could not run dumpasn1: %s]" % e
    finally:
      os.unlink(fn)
    return ret