Readme

(Linux Based) use Python3

Usage and Execution

Usage:

python3 read_cert.py Certificates/cert_bckup.p12 Certificates/root.crt Certificates/subject.crt CSE539_Rocks!

Mandatory Inputs: All above mentioned files are Mandatory (Total Arguments: 4)

Authors

• Atit S Gaonkar - 1217031322
• Jaswant Pakki - 1208755310

I/O

#Input:

.p12 - Backup file containing the private key of Subjects Public Key
subject.crt - Subject's Certificate
CA.crt - CA's Certificate
passphrase - Key to open .p12 File

#Output:

Sub-task 1

Verify the Subject’s certificate (print True if valid, False otherwise)

Sub-task 2 - Subject's Information

a.       *Subject name
b.       Issuer
c.       Serial Number
d.       Encryption Algorithm
e.       Not Valid Before
f.       Not Valid After

Sub-task 3 - Subject's Key Information

a.       Public Key Modulus (n)
b.       Public Key Exponent (e)
c.       Private Key Exponent (d)

Sub-task 4 - CA's Key Information

a.       Root Public Key Modulus (n)
b.       Root Public Key Exponent (e)

Sub-task 5 - Subject's Signature on Certificate

Print the hex signature on the Subject’s certificate

Sub-task 6 - Encryption

Encrypt b’Hello World’ using RSA (OEAP Padding, MGF Function as MGF1 and SHA256 hash function). Encryption using Subject's public key

Packages Imported

• OpenSSL.Crypto

from OpenSSL.crypto import (load_certificate, dump_privatekey, dump_certificate, X509, X509Name, PKey, TYPE_DSA, TYPE_RSA, FILETYPE_PEM, FILETYPE_ASN1, load_pkcs12)

• cryptography.hazmat.primitives.asymmetric

from cryptography.hazmat.primitives.asymmetric import padding

• cryptography.hazmat.backends

from cryptography.hazmat.backends import default_backend

• Crypto.Util.asn1

from Crypto.Util.asn1 import (DerSequence, DerObject)

• cryptography.hazmat.primitives

from cryptography.hazmat.primitives import hashes

• Crypto.PublicKey

from Crypto.PublicKey import RSA

• import OpenSSL.crypto

• import sys