Once you visit https://passwrd.in , you will know the problem it solves !

A thoughtful advice given to me long back, just posting it here for general reference, should work for you too 😉

Stand strong always, may the sun always shine brightly for you after heavy rain.

Anger is paralyzing, its just the absence of control, You will have no use of it whatsoever.

So be patient and calm, make people quiet wid your skills, mindset and behavior if these three don’t work then don’t think ur words would matter.

Anonymous, June 2014

Hardware based tokens are widely used in India to generate signed PDF’s like invoices and agreement. We wrote small Python code to sign the invoices automatically where token was attached to a local server.

Windows drives are widely available but rare to find linux drivers are listed https://www.e-mudhra.com/Repository/index.html

You can uncomment to get the token name print(self.pkcs11.getSlotList(tokenPresent=True))
print(self.pkcs11.getTokenInfo(1)) to get token name, for PROXKey the name "WD PROXKey" was generated.

#!/usr/bin/env vpython3
# *-* coding: utf-8 *-*
import sys
import datetime
from endesive import pdf, hsm

import os
import sys

if sys.platform == 'win32':
    dllpath = r'c:\windows\system32\cryptoCertum3PKCS.dll'
else:
    dllpath = '/usr/lib/WatchData/ProxKey/lib/libwdpkcs_SignatureP11.so'

import PyKCS11 as PK11

class Signer(hsm.HSM):
    def certificate(self):
        #print(self.pkcs11.getSlotList(tokenPresent=True))
        #print(self.pkcs11.getTokenInfo(1))
#        print(self.pkcs11.getTokenInfo(2))
#        print(self.pkcs11.getTokenInfo(3))


#        print(self.pkcs11.getSlotInfo(1))
        self.login("WD PROXKey","12345678") # WF PROXKey is token name.
        keyid = [0x5e, 0x9a, 0x33, 0x44, 0x8b, 0xc3, 0xa1, 0x35, 0x33, 0xc7, 0xc2, 0x02, 0xf6, 0x9b, 0xde, 0x55, 0xfe, 0x83, 0x7b, 0xde]
        #keyid = [0x3f, 0xa6, 0x63, 0xdb, 0x75, 0x97, 0x5d, 0xa6, 0xb0, 0x32, 0xef, 0x2d, 0xdc, 0xc4, 0x8d, 0xe8]
        keyid = bytes(keyid)
        try:
            pk11objects = self.session.findObjects([(PK11.CKA_CLASS, PK11.CKO_CERTIFICATE)])
            all_attributes = [
                #PK11.CKA_SUBJECT,
                PK11.CKA_VALUE,
                #PK11.CKA_ISSUER,
                #PK11.CKA_CERTIFICATE_CATEGORY,
                #PK11.CKA_END_DATE,
                PK11.CKA_ID,
            ]

            for pk11object in pk11objects:
                try:
                    attributes = self.session.getAttributeValue(pk11object, all_attributes)
                except PK11.PyKCS11Error as e:
                    continue

                attrDict = dict(list(zip(all_attributes, attributes)))
                cert = bytes(attrDict[PK11.CKA_VALUE])
                #if keyid == bytes(attrDict[PK11.CKA_ID]):
                return bytes(attrDict[PK11.CKA_ID]), cert
        finally:
            self.logout()
        return None, None

    def sign(self, keyid, data, mech):
        self.login("WD PROXKey","12345678")
        try:
            privKey = self.session.findObjects([(PK11.CKA_CLASS, PK11.CKO_PRIVATE_KEY)])[0]
            mech = getattr(PK11, 'CKM_%s_RSA_PKCS' % mech.upper())
            sig = self.session.sign(privKey, data, PK11.Mechanism(mech, None))
            return bytes(sig)
        finally:
            self.logout()

def main():
    date = datetime.datetime.utcnow() - datetime.timedelta(hours=12)
    date = date.strftime('%Y%m%d%H%M%S+00\'00\'')
    dct = {
        "sigflags": 3,
        "sigpage": 0,
        "sigbutton": True,
        "contact": "[email protected]",
        "location": 'India',
        "signingdate": date.encode(),
        "reason": 'Sample sign',
        "signature": 'Madhurendra Sachan',
        "signaturebox": (0, 0, 100, 100),
    }
    clshsm = Signer(dllpath)
    fname = 'sample.pdf'
    datau = open(fname, 'rb').read()
    datas = pdf.cms.sign(datau, dct,
        None, None,
        [],
        'sha256',
        clshsm,
    )
    fname = fname.replace('.pdf', '-signed.pdf')
    with open(fname, 'wb') as fp:
        fp.write(datau)
        fp.write(datas)


main()

.dll/.so path for common tokens

• For Windows the file will be in Windows\SysWOW64″ or “WINDOWS\system32” or “WINNT\system32”
• For Linux machine the file will be in /usr/local/lib/ or /usr/lib/

So I am developer and maker – basically a keen person who is interested in almost everything which sounds logical. As hard it is to understand more interested I become in something.

In current “vast” space of information, On an average I read 10-15 articles a day that is being done since last 8 years but there hasn’t been a sense of knowledge satisfaction. If I compare it to my school days where I used to read through books which were related to computers, technical but outdated there is significant difference in satisfaction. (Do note, here I am not debating about articles in digital form & books in physical form.)

To understand the problem I started by creating a new habit.

Reading books – few pages as I wake up, few pages in evening. (Not a strict goal but 2 books/month – where each book averages to 200 pages and isn’t fictional )

So far it has been good and satisfaction level is quiet high !

but why ?

It seems it has to do with us :

1. We skim not read, We skim news paper for information, we usually skim articles for information which we seek, we skim most of the content. With time, when brain see’s similar organization of content it activates the skimming mode.
2. Information online is volatile; You might find similar or same piece of advise everywhere, copied & in few days it might disappear – & when not used it is trashed by brain. We need to see something once in a while to automatically recall & become more persistent.
   
   Eg: You read a book, keep it somewhere, you might stumble across it someday & open it – might check few things – you brain will start recalling many events but how many times you re-read same article ?
3. Content doesn’t have a sense of authenticity; You come across articles, read them, understand them but mostly you can’t trust a content. How many people spend a month or a year in writing an article ?
   Articles have one key focus SEO, even if content is genuine it should have click baits, keywords etc but authenticity is not something search engines seek.
4. Effort is missing; Again I am not talking about every article but publishing an article doesn’t require enough effort. While writing a book takes money, getting a publication house to agree and years of effort to put down thought – because once it is printed – it is printed.
   
   if you write something wrong – you can’t take book from people, there is error – it will persist for your lifetime. People will judge you by your book and it’s cover.
5. Information is not organized; When you get a book, it’s always on specific theme and in all those pages it will talk just about that. You read related content such that slowly it starts persisting in your brain. And that how I got a sense of knowledge.

Irony is – this is an article.

This doesn’t mean that articles are bad but I have following perception on how articles should or shouldn’t be :

1. Not for SEO : Yes, check the site if a lot of articles are of clickbait nature they will actually not convey good enough information. if a person is writing articles very frequently – those are there just for sake of being there.
2. Should convey meaningful information : Now days most articles are just DERIVED from some other article, it is a good thing if article can innovate in certain manner or atleast put effort to organise certain information.
3. There is no way but experience – on one hand you should not trust every source and should get information from trusted sources, but on other a good source doesn’t write frequently or broad topics. With time if one observes he/she can come to know how to identify bogus sources.
4. Refer to official sources for information, yes just as in programming there are millions of tutorials but if I ever want to learn about something new I refer to official documentation – it doesn’t matter how badly it is written but usually documentations are accurate and explain logic as they are written by developers not content writer having bleak understanding about underlying principles. Same if for everything – if you want to read about some rules refer to government issued rule book – might not sound good – but it’s best way to have accurate information.

I know this is not a popular blog and there are not million followers but since you have read this articles feel free to comment and share what I missed – what else should be incorporated.