How Can I Generate RSA Key Pairs in Go, Similar to OpenSSL's `openssl genrsa` Command?

Use Go to Generate RSA Keys in the Same Way as Openssl

The OpenSSL command openssl genrsa generates a pair of RSA keys, storing the private key in one file and the public key in another. To achieve this functionality in Go, you can follow these steps:

1. Generate the RSA key pair:

import "crypto/rand"

key, err := rsa.GenerateKey(rand.Reader, bitSize)
if err != nil {
    panic(err)
}

2. Extract the public key:

import "crypto/rsa"

pub := key.Public()

3. Encode the keys in PEM format:

import (
    "encoding/pem"
    "crypto/x509"
)

keyPEM := pem.EncodeToMemory(
    &pem.Block{
        Type:  "RSA PRIVATE KEY",
        Bytes: x509.MarshalPKCS1PrivateKey(key),
    },
)

pubPEM := pem.EncodeToMemory(
    &pem.Block{
        Type:  "RSA PUBLIC KEY",
        Bytes: x509.MarshalPKCS1PublicKey(pub.(*rsa.PublicKey)),
    },
)

4. Write the PEM-encoded keys to files:

import "io/ioutil"

err := ioutil.WriteFile(filename+".rsa", keyPEM, 0700)
err := ioutil.WriteFile(filename+".rsa.pub", pubPEM, 0755)

This code will generate two files, filename.rsa and filename.rsa.pub, containing the private and public RSA keys respectively. The keys will be in the PEM format, which allows you to easily import and use them with other applications.

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