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shellshaesrsa

Shell-script to decrypt file

I have to create a shell-script that can decrypt a RSA key file that is encrypted with a specific .pem file. And then to decrypt zip file with the AES key which I get from the RSA file once it is decrypted in a file named keyaes (or whatever you want). Here are the two commands I have to use 

openssl rsautl -decrypt -in AES_KEY -inkey CERTIFICATE.pem -out keyaes
openssl enc -d -aes-256-cbc -in zipfile.zip -out extraction.zip -nosalt -p -K RSA_KEY_from_key_aes_output -iv 0

The commands work perfectly, the problem is in my script I don't know how to make it automatically and to get the key from the keyaes output and put it into the next command properly. How can I do it ?

Solution

  • you could just use bash command substitution in the second command, using backticks

    openssl enc -d -aes-256-cbc -in zipfile.zip -out extraction.zip -nosalt -p -K `cat output_filename_with_aes_key` -iv 0