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

Generating RSA Keys with Go: Replicating Openssl genrsa

The OpenSSL command openssl genrsa -out $1.rsa $2 generates an RSA key pair and exports them to two separate files, $1.rsa for the private key and $1.rsa.pub for the public key. In Go, this process involves:

• Generating an RSA key pair
• Extracting the public key
• Converting the keys to PKCS#1 ASN.1 DER format
• Encoding them into PEM blocks
• Writing the keys to files

The following code demonstrates this process:

package main

import (
    "crypto/rand"
    "crypto/rsa"
    "crypto/x509"
    "encoding/pem"
    "io/ioutil"
)

func main() {
    filename := "key"
    bitSize := 4096

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

    if err := ioutil.WriteFile(filename+".rsa", keyPEM, 0700); err != nil {
        panic(err)
    }

    if err := ioutil.WriteFile(filename+".rsa.pub", pubPEM, 0755); err != nil {
        panic(err)
    }
}

This code generates the private key file key.rsa and the public key file key.rsa.pub. The contents of these files resemble the output of the OpenSSL command.

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