cheatsheets/cheatsheets/crypto/openssl_commands.md

---

title: Openssl Command Cheatsheet categories: [cheatsheets]

tags: [crypto]

Openssl cheatsheet

Generation

Generate Private Key:

openssl genrsa -out server.key 4096

Conversions / Extractions

Extract Certificate from PKCS12

openssl pkcs12 -nokeys -in certificate.[pfx/p12] -out certificate.crt

Extract Private Key from PKCS12

openssl pkcs12 -nocerts -in certificate.[pfx/p12] -out private.key

Remove Password from Private Key

openssl rsa -in -in private.key -out private.nopw.key

PEM to DER: RSA Key

openssl rsa -inform PEM -outform DER -text -in mykey.pem -out mykey.der

PEM to DER: X509

openssl x509 -inform DER -outform PEM -text -in mykey.der -out mykey.pem

View

View Certificate File (x509):

openssl x509 -pubkey -noout -in <file>

View Public Key File:

openssl rsa -noout -text -pubin < key.pub

View Private Key File:

openssl rsa -noout -text -in key.pub

Encryption/Decryption

Decrypt File using RSA Private Key

openssl rsautl -decrypt -inkey pkey.pem -in flag.enc -out out.dec