1. Download OpenSSL and install it
2. Key generation:
Linux users (take Ubuntu as an example)
$ openssl enter the OpenSSL program
OpenSSL > genrsa -out rsa_private_key.pem 1024 Generate private key
OpenSSL > pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt Java developers need to put the private key Convert to PKCS8 format (Note: use the Java development background, and the client iOS should also use this)
OpenSSL> rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem to generate the public key
OpenSSL> exit ## Exit the OpenSSL program
Windows users in cmd Perform the following operations in the window:
C:\OpenSSL-Win32\bin Enter the OpenSSL installation directory
C:\OpenSSL-Win32\bin> openssl.exe Enter the OpenSSL program
OpenSSL> genrsa -out rsa_private_key.pem 1024 Generate the private key
OpenSSL> pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt Java developers need to convert the private key to PKCS8 format
OpenSSL> rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem generate public key
OpenSSL> exit ## Exit the OpenSSL program
Attention Attention Attention:
genrsa -out rsa_private_key.pem 1024
rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
These two sentences will generate the rsa_private_key.pem file and the rsa_public_key.pem file in the bin directory of the OpenSSL installation directory, storing the private key and public key respectively.
pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt
This sentence will print the value of a private key in the cmd window. Note that this value is different from the value in the rsa_private_key.pem file above.
If you are developing in Java, use the value printed in the cmd window