Playing with public/private keys on the command line - public-key-encryption

I want to play with public/private keys just for fun.
I want to use shorter strings, just to see the magic in front of my eyes.
Example:
"Text_merry_X-mas" + small_key1 -> "any_small_unreadable_string"
"any_small_unreadable_string" + key2 -> "Text_merry_X-mas"
I do not care if the algorithm is RSA or anything else.
I just want to give this inputs and get outputs on the command line.
I do not want to encrypt files and let RSA calculate that long keys,
because again it is just for fun.
And i would like to be able to define key1, as we do for passwords.
Than let key2 be calculated from key1.
Can you guys give me some tips?
Thx a los!


Broadly:
For Asymmetric encryption you must first generate your private key and extract the public key.
openssl genrsa -aes256 -out private.key 8912
openssl rsa -in private.key -pubout -out public.key
To encrypt:
openssl rsautl -encrypt -pubin -inkey public.key -in plaintext.txt -out encrypted.txt
To decrypt:
openssl rsautl -decrypt -inkey private.key -in encrypted.txt -out plaintext.txt
This and more nicely summarized here: https://gist.github.com/dreikanter/c7e85598664901afae03fedff308736b

Related

openssl pkcs12 set password from command line

I have a bash command like this
openssl pkcs12 -export -out ~/certificate.pfx -inkey /etc/letsencrypt/live/exapmle.com/privkey.pem -in /etc/letsencrypt/live/exapmle.com/cert.pem -certfile /etc/letsencrypt/live/exapmle.com/chain.pem
and now I'll be asked to enter a password to encrypt the .pfx file. So is there any way to set a password from command line to don't doing this operation manually every time?

Resulting command is
openssl pkcs12 -password pass:your_password -export -out ~/certificate.pfx -inkey /etc/letsencrypt/live/exapmle.com/privkey.pem -in /etc/letsencrypt/live/exapmle.com/cert.pem -certfile /etc/letsencrypt/live/exapmle.com/chain.pem

How to Pass PKCS12 password into openssl conversion module?

script.sh
certKey=$(openssl rand -hex 70)
openssl pkcs12 -export -out fullchain.p12 --passin pass:$certKey -inkey .../privkey.pem -in .../fullchain.pem
I when calling this script the certKey is not passed in, and system asks me for the pkcs12 password. But I am clearly trying to pass $certKey in.
openssl Documention
"-passin arg
The PKCS#12 file (i.e. input file) password source. For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl(1)."
What am I missing? Thanks!

Should be -passout
openssl pkcs12 -export -out fullchain.p12 -passout pass:$certKey -inkey .../privkey.pem -in .../fullchain.pem

OpenSSL commands to Ruby

Is there a way to run the following shell commands only on ruby?
I searched for weeks but I'm afraid it's not very well documented. I've tried a few methods from Ruby 'openssl' but I get different results.
%x[openssl pkcs8 -inform DER -in key.key -passin pass:passcode -out key.pem]
%x[openssl x509 -inform DER -in certificate.cer -noout -serial > serial.txt]
%x[openssl dgst -sha256 -out sign.bin -sign key.pem serial.txt]
%x[openssl enc -in sign.bin -a -A -out stamp.txt]

entering password into openssl command from shell script

I am trying to convert a p12 to a pem from a shell script without any user input.
I can have the password as a variable within the script.
so when I call:
openssl pkcs12 -in *.p12 -out cert.pem -nodes
The terminal prints "Enter Import Password:" and waits for input.
I tried to pipe the password in with:
echo $PASS | openssl pkcs12 -in *.p12 -out cert.pem -nodes
as well as trying to use a flag with the openssl command but can't figure out how to do this.

This one liner worked for me-
openssl pkcs12 -in certificate.p12 -password pass:<your_password> -nodes | openssl x509 -noout -enddate

Working with openssl to extract information from a pkcs12 certificate

I would like some help with the openssl command. I need to automate the retrieval of the subject= line in a pkcs12 certificate for a script I'm working on.
I've used openssl to view the contents of the Identity/Certificate:
openssl pkcs12 -info -in /Users/[user]/Desktop/ID.pfx
But I am prompted three times for the password. I used -passin to eliminate one of the password prompts, but I am still being prompted for the PEM pass phrase and verification entry.
I need to figure out a way to pass ${password} to the other two password challenges or have the scrip issue a ctl-c. The piece of info I need is outputted to the stdout before the second password prompt.
Any help would be appreciated!
Obviously I gutted the certificate output for this post.... but you should get the idea of what I'm seeing:
bash-3.2# openssl pkcs12 -info -in /Users/[user]/Desktop/ID.pfx -passin pass:${password}
MAC Iteration 2048
MAC verified OK
PKCS7 Encrypted data: pbeWithSHA1And40BitRC2-CBC, Iteration 2048
Certificate bag
Bag Attributes
localKeyID: ****
friendlyName: ****
subject=****
issuer=****
-----BEGIN CERTIFICATE-----
::HASH REMOVED::
-----END CERTIFICATE-----
PKCS7 Data
Shrouded Keybag: ****
Bag Attributes
localKeyID: ****
friendlyName: ****
Key Attributes: <No Attributes>
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info:
::HASH REMOVED::
-----END RSA PRIVATE KEY-----
bash-3.2#

Try this:
$ openssl pkcs12 -in ~/cert.p12 -nodes \
-passin pass:"my password" | openssl x509 -noout -subject
Or this for the common name (ruby to strip trailing whitespace):
$ openssl pkcs12 -in ~/cert.p12 -nodes \
-passin pass:"my password" | openssl x509 -noout -subject \
| awk -F'[=/]' '{print $6}'`.strip`

Copying answer here in order to remove this question from the "Unanswered" filter:
openssl pkcs12 -nokeys -in /Users/[User]/Desktop/ID.pfx -passin pass:${password}

You could also use -passin and -passout which would not prompt you again for manual input. Here is a sample code:
openssl pkcs12 -in seldpush_dev.p12 -passin pass:$password -passout pass:$password | \
sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | \
openssl x509 -subject -noout
Basically, use -keyword to fetch that value. In your case, -subject.

This is a few years late; I'm not familiar with openssl, & etc; but since I see no reference to "-nokeys" I'll give what works for me.
echo -e "$password\n$passphrase\n$passphrase\n" \
| openssl pkcs12 -in /Users/[user]/Desktop/ID.pfx -passin stdin -passout stdin
from manpage
stdin read the password from standard input.

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