Some common operations openssl public and private key to decrypt the command and processing

Generate public and private key practices:

Generating a private key, here for elliptic curve secp256k1 Example:

-name secp256k1 -genkey -out ecparam OpenSSL secp256k1-priv.pem                            # EC with curve parameters
 OpenSSL ecparam -name secp256k1 -genkey secp256k1 -noout -out-priv.pem                     # curve parameters without EC

View the contents of the private key file, including hex encoded form of private and public keys:

openssl pkey -in secp256k1-priv.pem -text

The public key corresponding to the secret key generation:

openssl ec -in secp256k1-priv.key -pubout -out secp256k1-pub.key

 

There are generally two private key file formats pkcs # 1 and pkcs # 8, the default is generated above pkcs # 1 format,

pkcs # 1 includes the head and tail format:

-----BEGIN EC PRIVATE KEY-----
......
-----END EC PRIVATE KEY-----

pkcs # 8 includes the head and tail format

-----BEGIN PRIVATE KEY-----
......
-----END PRIVATE KEY-----

If you want to convert pkcs # 8 format:

openssl pkcs8 -topk8 -nocrypt -in secp256k1-priv.key -out secp256k1-priv-pk8.key