How to generate keys in PEM formatusing the OpenSSL command line tools?

1. Openssl Generate Rsa
2. Openssl Rsa Key Pair

1. Reasons for importing keys include wanting to make a backup of a private key (generated keys are non-exportable, for security reasons), or if the private key is provided by an external source. This document will guide you through using the OpenSSL command line tool to generate a key pair which you can then import into a YubiKey.
2. The private key is generated and saved in a file named 'rsa.private' located in the same folder. Generating the Public Key - Linux 1. Open the Terminal. Type the following: openssl rsa -in rsa.private -out rsa.public -pubout -outform PEM 2. The public key is saved in a file named rsa.public located in the same folder.
3. Therefore i want to send the public key over to a different user, so he can use it to encrypt some data, and then send it back to me. Here is the code that generates the keys: //Generate key pair RSA.keypair = RSAgeneratekey(KEYLENGTH, PUBEXP, NULL, NULL).
4. While Encrypting a File with a Password from the Command Line using OpenSSL is very useful in its own right, the real power of the OpenSSL library is its ability to support the use of public key cryptograph for encrypting or validating data in an unattended manner (where the password is not required to encrypt) is done with public keys.

Generate OpenSSL RSA Key Pair from the Command Line. You can generate a public and private RSA key pair like this: openssl genrsa -des3 -out private.pem 2048. Generate jwt key from secret. This is how you know that this file is the public key of the pair and not a private key. Generate RSA Key Pair with openssl genpkey OpenSSL is a giant command-line binary capable of a lot of various security related utilities. Each utility is easily broken down via the first argument of openssl. For instance, to generate an RSA key, the command to use will be openssl genpkey. Generate 2048-bit AES-256 Encrypted RSA Private Key.pem.

RSA keys

The JOSE standard recommends a minimum RSA key size of 2048 bits.

To generate a 2048-bit RSA private + public key pair for use in RSxxx and PSxxxsignatures:

Elliptic Curve keys

To generate an EC key pair the curve designation must be specified. Note thatJOSE ESxxx signatures require P-256, P-384 and P-521 curves (see theircorresponding OpenSSL identifiers below).

Elliptic Curve private + public key pair for use with ES256 signatures:

Elliptic Curve private + public key pair for use with ES384 signatures:

Elliptic Curve private + public key pair for use with ES512 signatures:

PEM key parsing in Java

The BouncyCastle library provides a simpleutility to parse PEM-encoded keys in Java, to use them for JWS or JWE later. K9 web protection key generator.

Openssl Generate Rsa

For Maven you should include the following BouncyCastle dependencies (where1.52 is the latest stable version as of May 2015):

Openssl Rsa Key Pair

Example parsing of an PEM-encoded EC key in Java: