adjusted openssl commands

cheatsheets/crypto/openssl_commands.md

@@ -5,34 +5,72 @@ tags: [crypto]
 ---
 # Openssl cheatsheet
 
+## Generation
 
-## View Certificate File (x509):
+### 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:
+### View Public Key File:
 
 ```
 openssl rsa -noout -text -pubin < key.pub
 ```
 
-## View Private Key File:
+### View Private Key File:
 
 ```
 openssl rsa -noout -text -in key.pub
 ```
 
-## Generate Private Key:
 
-```
-openssl genrsa -out server.key 4096
-```
+## Encryption/Decryption
 
-## Decrypt File using RSA Private Key
+### Decrypt File using RSA Private Key
 
 ```
 openssl rsautl -decrypt -inkey pkey.pem -in flag.enc -out out.dec
 ```
-