Golang Generate Rsa Key Pem Public

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  2. Nov 13, 2018 go lang rsa, go lang generate rsa keys, go lang rsa encryption decryption, go lang GenerateMultiPrimeKey, go lang RSA OAEP, go lang RSAPKCS1-V15 Sign Verify, go lang RSAPSS Sign/Verify, go lang Export RSA Key to PEM Format, export, import PEM Key to RSA Format.
  3. Openssl genrsa -des3 -out private.pem 2048. That generates a 2048-bit RSA key pair, encrypts them with a password you provide and writes them to a file. You need to next extract the public key file. You will use this, for instance, on your web server to encrypt content so that it can only be read with the private key. Export the RSA Public Key.
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Rsa

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Generate SSH RSA Private/Public Key pair with Golang
gistfile1.txt

Golang Rsa Signature

// This shows an example of how to generate a SSH RSA Private/Public key pair and save it locally
package main
import (
'crypto/rand'
'crypto/rsa'
'crypto/x509'
'encoding/pem'
'golang.org/x/crypto/ssh'
'io/ioutil'
'log'
)
func main() {
savePrivateFileTo := './id_rsa_test'
savePublicFileTo := './id_rsa_test.pub'
bitSize := 4096
privateKey, err := generatePrivateKey(bitSize)
if err != nil {
log.Fatal(err.Error())
}
publicKeyBytes, err := generatePublicKey(&privateKey.PublicKey)
if err != nil {
log.Fatal(err.Error())
}
privateKeyBytes := encodePrivateKeyToPEM(privateKey)
err = writeKeyToFile(privateKeyBytes, savePrivateFileTo)
if err != nil {
log.Fatal(err.Error())
}
err = writeKeyToFile([]byte(publicKeyBytes), savePublicFileTo)
if err != nil {
log.Fatal(err.Error())
}
}
// generatePrivateKey creates a RSA Private Key of specified byte size
func generatePrivateKey(bitSize int) (*rsa.PrivateKey, error) {
// Private Key generation
privateKey, err := rsa.GenerateKey(rand.Reader, bitSize)
if err != nil {
return nil, err
}
// Validate Private Key
err = privateKey.Validate()
if err != nil {
return nil, err
}
log.Println('Private Key generated')
return privateKey, nil
}
// encodePrivateKeyToPEM encodes Private Key from RSA to PEM format
func encodePrivateKeyToPEM(privateKey *rsa.PrivateKey) []byte {
// Get ASN.1 DER format
privDER := x509.MarshalPKCS1PrivateKey(privateKey)
// pem.Block
privBlock := pem.Block{
Type: 'RSA PRIVATE KEY',
Headers: nil,
Bytes: privDER,
}
// Private key in PEM format
privatePEM := pem.EncodeToMemory(&privBlock)
return privatePEM
}
// generatePublicKey take a rsa.PublicKey and return bytes suitable for writing to .pub file
// returns in the format 'ssh-rsa ..'
func generatePublicKey(privatekey *rsa.PublicKey) ([]byte, error) {
publicRsaKey, err := ssh.NewPublicKey(privatekey)
if err != nil {
return nil, err
}
pubKeyBytes := ssh.MarshalAuthorizedKey(publicRsaKey)
log.Println('Public key generated')
return pubKeyBytes, nil
}
// writePemToFile writes keys to a file
func writeKeyToFile(keyBytes []byte, saveFileTo string) error {
err := ioutil.WriteFile(saveFileTo, keyBytes, 0600)
if err != nil {
return err
}
log.Printf('Key saved to: %s', saveFileTo)
return nil
}
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Golang Generate Rsa Key Pem Public Works

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package main
import (
'crypto'
'crypto/rand'
'crypto/rsa'
'crypto/sha256'
'fmt'
'os'
)
funcmain() {
// Generate RSA Keys
miryanPrivateKey, err:=rsa.GenerateKey(rand.Reader, 2048)
iferr!=nil {
fmt.Println(err.Error)
os.Exit(1)
}
miryanPublicKey:=&miryanPrivateKey.PublicKey
raulPrivateKey, err:=rsa.GenerateKey(rand.Reader, 2048)
iferr!=nil {
fmt.Println(err.Error)
os.Exit(1)
}
raulPublicKey:=&raulPrivateKey.PublicKey
fmt.Println('Private Key : ', miryanPrivateKey)
fmt.Println('Public key ', miryanPublicKey)
fmt.Println('Private Key : ', raulPrivateKey)
fmt.Println('Public key ', raulPublicKey)
//Encrypt Miryan Message
message:= []byte('the code must be like a piece of music')
label:= []byte(')
hash:=sha256.New()
ciphertext, err:=rsa.EncryptOAEP(hash, rand.Reader, raulPublicKey, message, label)
iferr!=nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Printf('OAEP encrypted [%s] to n[%x]n', string(message), ciphertext)
fmt.Println()
// Message - Signature
varopts rsa.PSSOptions
opts.SaltLength=rsa.PSSSaltLengthAuto// for simple example
PSSmessage:=message
newhash:=crypto.SHA256
pssh:=newhash.New()
pssh.Write(PSSmessage)
hashed:=pssh.Sum(nil)
signature, err:=rsa.SignPSS(rand.Reader, miryanPrivateKey, newhash, hashed, &opts)
iferr!=nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Printf('PSS Signature : %xn', signature)
// Decrypt Message
plainText, err:=rsa.DecryptOAEP(hash, rand.Reader, raulPrivateKey, ciphertext, label)
iferr!=nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Printf('OAEP decrypted [%x] to n[%s]n', ciphertext, plainText)
//Verify Signature
err=rsa.VerifyPSS(miryanPublicKey, newhash, hashed, signature, &opts)
iferr!=nil {
fmt.Println('Who are U? Verify Signature failed')
os.Exit(1)
} else {
fmt.Println('Verify Signature successful')
}
}
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