decrypt

This is a repository for decryption using OpenSSL

Usage

1. Generate the private key using RSA

   openssl genrsa -aes256 -out private2.pem 2048
   

2. Generate the public key using RSA

   openssl rsa -in private2.pem -pubout > public2.pem
   

3. Decrypt the session key using the private key

   openssl rsautl -decrypt -inkey private2.pem -in session.enc -out session.txt
   cat session.txt
   

4. Decrypt the message using 256-bit AES in CBC mode

   openssl enc -d -aes-256-cbc -salt -in message.enc -out message.txt
   

5. Decrypt the session key using 256-bit AES in CBC mode with session key

   openssl enc -d -aes-256-cbc -salt -in signature.enc -out signature.txt
   

6. Compare the expected signiture with the original signiture

   openssl dgst -sha256 -verify public.pem -signature signature.txt message.txt