While Encrypting a File with a Password from the Command Line using OpenSSLis very useful in its own right, the real power https://certifiedgreat.weebly.com/rails-generate-custom-secret-key.html. of the OpenSSL library is itsability to support the use of public key cryptograph for encrypting orvalidating data in an unattended manner (where the password is not required toencrypt) is done with public keys.
The Commands to RunGenerate a 2048 bit RSA Key
Generate public key from private key putty. You can generate a public and private RSA key pair like this:
The RSA private key used to encrypt my AES key never has to leave the boundaries of the HSM. Even better - I can use the secrets API in Key Vault to store my new wrapped key, so I don’t actually have any encryption keys stored locally with my application. DIAGRAM HERE. I implemented this in a.net standard library. Generating an RSA key.
openssl genrsa -des3 -out private.pem 2048
That generates a 2048-bit RSA key pair, encrypts them with a password you provideand writes them to a file. You need to next extract the public key file. You willuse this, for instance, on your web server to encrypt content so that it canonly be read with the private key.
Export the RSA Public Key to a File
This is a command that is
openssl rsa -in private.pem -outform PEM -pubout -out public.pem
The
-pubout flag is really important. Be sure to include it.
Next open the
public.pem and ensure that it starts with-----BEGIN PUBLIC KEY----- . This is how you know that this file is thepublic key of the pair and not a private key.
To check the file from the command line you can use the
less command, like this:
less public.pem
Do Not Run This, it Exports the Private Key
A previous version of the post gave this example in error.
openssl rsa -in private.pem -out private_unencrypted.pem -outform PEM
The error is that the
-pubout was dropped from the end of the command.That changes the meaning of the command from that of exporting the public keyto exporting the private key outside of its encrypted wrapper. Inspecting theoutput file, in this case private_unencrypted.pem clearly shows that the keyis a RSA private key as it starts with -----BEGIN RSA PRIVATE KEY----- .
Visually Inspect Your Key Files
It is important to visually inspect you private and public key files to makesure that they are what you expect. OpenSSL will clearly explain the nature ofthe key block with a
-----BEGIN RSA PRIVATE KEY----- or -----BEGIN PUBLIC KEY----- .
You can use less to inspect each of your two files in turn:
Using Aspnet_regiis To Generate Public Private Rsa Keys List
The next section shows a full example of what each key file should look like. Trend micro internet security key generator.
The Generated Key Files
The generated files are base64-encoded encryption keys in plain text format.If you select a password for your private key, its file will be encrypted withyour password. Be sure to remember this password or the key pair becomes useless.
The private.pem file looks something like this:The public key, public.pem, file looks like:Protecting Your Keys
Depending on the nature of the information you will protect, it’s important tokeep the private key backed up and secret. The public key can be distributedanywhere or embedded in your web application scripts, such as in your PHP,Ruby, or other scripts. Again, backup your keys!
Remember, if the key goes away the data encrypted to it is gone. Keeping aprinted copy of the key material in a sealed envelope in a bank safety depositbox is a good way to protect important keys against loss due to fire or harddrive failure.
Oh, and one last thing.
If you, dear reader, were planning any funny business with the private key that I have just published here. Know that they were made especially for this series of blog posts. I do not use them for anything else.
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Asymmetric private keys should never be stored verbatim or in plain text on the local computer. If you need to store a private key, you should use a key container. For more information on key containers, see Understanding Machine-Level and User-Level RSA Key Containers.
To create an asymmetric key and save it in a key container
To delete the key from a key container
Using Aspnet_regiis To Generate Public Private Rsa Keys DownloadExample
The following example demonstrates how to create an asymmetric key, save it in a key container, retrieve the key at a later time, and delete the key from the container.
Using Aspnet_regiis To Generate Public Private Rsa Keys In Excel
Notice that code in the
GenKey_SaveInContainer method and the GetKeyFromContainer method is similar. When you specify a key container name for a CspParameters object and pass it to an AsymmetricAlgorithm object with the PersistKeyInCsp property or PersistKeyInCsp property set to true, the following occurs. If a key container with the specified name does not exist, then one is created and the key is persisted. If a key container with the specified name does exist, then the key in the container is automatically loaded into the current AsymmetricAlgorithm object. Therefore, the code in the GenKey_SaveInContainer method persists the key because it is run first, while the code in the GetKeyFromContainer method loads the key because it is run second.
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