In the RSA algorithm the public key is build using the modulus and the public exponent, which means that we can always derive the public key from the private key. OpenSSL can easily do this with the rsa module, producing the public key in PEM format.

  • Generate RSA Key and Export to Encrypted PEM; RSA Encrypt and Decrypt Strings; Generate RSA Public/Private Key; RSA Sign Using Private Key from.pfx/.p12 to Base64 Signature; RSA Encrypt with Modulus and Exponent; Generate RSA Key and Sign a String; RSA Encrypting Symmetric Secret Key; LastErrorText; RSA OAEP Padding.
  • Online jwk to pem online, pem to jwk online. Thanks for using this software, for Cofee/Beer/Amazon bill and further development of this project please Share. Any private key value that you enter or we generate is not stored on this site, this tool is provided via an HTTPS URL to ensure that private keys cannot be stolen, for extra security run this software on your network, no cloud dependency.
  • In order to generate a RSA public key in PEM format to be used with openssl, you can follow these steps. Create an ASN1 definition file. Modify the following template to include your modulus and exponent.
  • Nov 09, 2015  While 'generate' isn't the right word here, this is exactly what this program does: convert a 'raw' binary modulus into a typical key format. I think create PEM-encoded RSA private and public key from modulus and exponent is worth developing in the future.
  • In the RSA algorithm the public key is build using the modulus and the public exponent, which means that we can always derive the public key from the private key. OpenSSL can easily do this with the rsa module, producing the public key in PEM format.
Openssl modulus

There's a scenario, when your Android app connect to your server, there're some secret keys like authentication key, the keys for encrypting the data you send to the server and the keys for decrypting you get from the server.. etc. You don't want users to reverse engineering your apk and find those keys easily, we've got two ways to hide your secret keys.

Using this program to encrypt your secret keys, you post those encrypted strings to your android project. Then, fill in the parameters generated by this program in your project for decryption to decrypt the messages.

  • Generate encrypted messages.
  • Generate a pair of RSA modulus and exponent for decryption.

Step1. Fill in your secret keys

Generate Rsa Key From Modulus And Exponent

Step2. Run Main.java

You'd get logs in your consult like that:

Step3. Add the decryption method to your project

  1. Create Algorithm class and paste the following codes
  1. Add the decryption method to your project, see android sample project here SecuritySample

When you add new secret keys, you must refill modulus, exponent and the other encrypted keys, because you get different RSA KeyPair(private key and public key) every execution.

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Comments

Openssl Modulus

commented Nov 9, 2015

Hi Jonathon,
Thank for your routine,It save my a lot of time.

Generate Rsa Key From Modulus And Exponent Numbers

commented Nov 16, 2015

I'm not sure what you're asking, exactly.

I get another problem that i have to generate the RSA private key from raw modulus and exponent.

While 'generate' isn't the right word here, this is exactly what this program does: convert a 'raw' binary modulus into a typical key format.

I think create PEM-encoded RSA private and public key from modulus and exponent is worth developing in the future.

This, along with the title of your issue is copy & pasted directly out of the description for this project:

Create PEM-encoded RSA pubilc key from raw modulus / exponent

What exactly are you trying to do? If you're trying to generate an RSA keypair, there are many resources that tell you how to do this with OpenSSL:

commented Dec 15, 2015

And now you've deleted the rest of the text. Sigh.

Rsakeyvalue Modulus

closed this Dec 15, 2015

Generate Rsa Key From Modulus And Exponents

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