Openssl Ec Key Pair Generation
How to generate keys in PEM formatusing the OpenSSL command line tools?
Mar 03, 2020 These commands create the following public/private key pair: ecprivate.pem: The private key that must be securely stored on the device and used to sign the authentication JWT. Ecpublic.pem: The public key that must be stored in Cloud IoT Core and used to verify the signature of the authentication JWT. Generating the Private Key - Linux 1. Open the Terminal. Navigate to the folder with the ListManager directory. Type the following: openssl genrsa -out rsa.private 1024 4. 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. Generating the EC private key. First of all we use OpenSSL ecparam command to generate an elliptic curve private key. Ethereum standard is to use the secp256k1 curve. The same curve is used by Bitcoin. This command will print the private key in PEM format (using the wonderful ASN.1 key. Once you have a DSA or ECDSA key pair, you can generate a self-signed certificate containing the public key, and signed with the private key: openssl req -x509 -new -key dsakey.pem -out cert.pem (Replace 'dsakey.pem' with 'eckey.pem' to use the EC key generated above.).
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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:
command.3. Encrypt the short password with the RSA public key.This can be done using the OpenSSL 'rsautl -encrypt' command.4. AIf you are trying to use an RSA public key to encrypt a file larger than the key size directly,you will get the 'data too large for key size' error.One option to resolve the problem is to use the RSA-AEShybrid encryption process as described blow:1. Generate a one-time random AES (Advanced Encryption Standard)symmetric encryption password shorter than the RSA public key.This can be done using the OpenSSL 'rand n' command.2. Openssl generate large rsa key. Encrypt the large input data with the AES algorithm using the short password.This can be done using the OpenSSL 'enc -e -aes.'
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.
For Maven you should include the following BouncyCastle dependencies (where1.52 is the latest stable version as of May 2015):
Openssl Ec Key Pair Generation 3
Example parsing of an PEM-encoded EC key in Java: