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. Generate the CSR code and Private key for your certificate by running this command: openssl req -new -newkey rsa:2048 -nodes -keyout server.key -out servercsr.txt. Note: server.key and servercsr.txt are the Private key and the CSR code files. Feel free to use any file names, as long as you keep the.key and.txt extensions. Openssl genpkey -algorithm RSA -out key.pem. Encrypt output private key using 128 bit AES and the passphrase 'hello': openssl genpkey -algorithm RSA -out key.pem -aes-128-cbc -pass pass:hello. Generate a 2048 bit RSA key using 3 as the public exponent: openssl genpkey -algorithm RSA -out key.pem -pkeyopt rsakeygenbits:2048 -pkeyopt rsa.
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You may generate an RSA private key with the help of this tool. Additionally, it will display the public key of a generated or pasted private key.
Description
RSA is an asymmetric encryption algorithm. With a given key pair, data that is encrypted with one key can only be decrypted by the other. This is useful for encrypting data between a large number of parties; only one key pair per person need exist. RSA is widely used across the internet with HTTPS.
To generate a key pair, select the bit length of your key pair and click Generate key pair. Depending on length, your browser may take a long time to generate the key pair. A 1024-bit key will usually be ready instantly, while a 4096-bit key may take up to several minutes. For a faster and more secure method, see Do It Yourself below.
CryptoTools.net does not yet have a tool for facilitating the encryption and decryption of data using RSA, but you may Do It Yourself with the instructions below.
Do It Yourself
For these steps, you will need a command line shell with OpenSSL. Ideally, you should have a private key of your own and a public key from someone else. For demonstration, we will only use a single key pair.
Generate Private Key
Run this command to generate a 4096-bit private key and output it to the private.pem file. If you like, you may change the key length and/or output file.
Derive Public Key
Given a private key, you may derive its public key and output it to public.pem using this command. (You may also paste your OpenSSL-generated private key into the form above to get its public key.)
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![]() Encrypt Data
We can now use this key pair to encrypt and decrypt a file, data.txt.
Openssl Generate Rsa Key PairDecrypt Data
Given the encrypted file from the previous step, you may decrypt it like so.
How to generate keys in PEM formatusing the OpenSSL command line tools?
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:
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Elliptic Curve private + public key pair for use with ES384 signatures:
Elliptic Curve private + public key pair for use with ES512 signatures:
Generate Key With OpensslPEM 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.
For Maven you should include the following BouncyCastle dependencies (where1.52 is the latest stable version as of May 2015):
Example parsing of an PEM-encoded EC key in Java:
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