Andreas Auernhammer <******@****.***> 1747405662 +0200

```

#### 3.2.2 Generate a private key with RSA

Use the following command to generate a private key with RSA:

```sh
openssl genrsa -out private.key 2048
```

A response similar to this one should be displayed:

```
Generating RSA private key, 2048 bit long modulus
............................................+++
...........+++

	K   string `json:"k,omitempty"`
}

var (
	errMalformedJWKRSAKey = errors.New("malformed JWK RSA key")
	errMalformedJWKECKey  = errors.New("malformed JWK EC key")
)

// DecodePublicKey - decodes JSON Web Key (JWK) as public key
func (key *JWKS) DecodePublicKey() (crypto.PublicKey, error) {
	switch key.Kty {
	case "RSA":
		if key.N == "" || key.E == "" {
			return nil, errMalformedJWKRSAKey
		}

		// decode exponent

    }

  /**
   * Returns the RSA private key encoded in [PKCS #1][rfc_8017] [PEM format][rfc_7468].
   *
   * [rfc_8017]: https://tools.ietf.org/html/rfc8017
   * [rfc_7468]: https://tools.ietf.org/html/rfc7468
   */
  fun privateKeyPkcs1Pem(): String {
    check(keyPair.private is RSAPrivateKey) { "PKCS1 only supports RSA keys" }
    return buildString {
      append("-----BEGIN RSA PRIVATE KEY-----\n")

package openid

import (
	"bytes"
	"crypto"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rsa"
	"encoding/json"
	"testing"
)

func TestAzurePublicKey(t *testing.T) {

        |-----END CERTIFICATE-----
        |-----BEGIN RSA PRIVATE KEY-----
        |sXPVYAsGD1wizrXX+wFaL3chtF1oG1Fx/jcsSsG6BA==
        |-----END RSA PRIVATE KEY-----
        |
        """.trimMargin(),
      )
      fail<Any>()
    } catch (expected: IllegalArgumentException) {
      assertThat(expected.message).isEqualTo("unexpected type: RSA PRIVATE KEY")
    }
  }

  @Test

    // [x509_extensions]
    // subjectAltName=DNS:localhost.localdomain,DNS:localhost,IP:127.0.0.1
    //
    // $ openssl req -x509 -nodes -days 36500 -subj '/CN=localhost' -config ./cert.cnf \
    //     -newkey rsa:512 -out cert.pem
    val certificate =
      certificate(
        """
        -----BEGIN CERTIFICATE-----
        MIIBWDCCAQKgAwIBAgIJANS1EtICX2AZMA0GCSqGSIb3DQEBBQUAMBQxEjAQBgNV

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package main

import (
	"crypto/rsa"
	"crypto/x509"
	"encoding/base64"
	"encoding/pem"
	"log"
)

func bytesToPrivateKey(priv []byte) (*rsa.PrivateKey, error) {
	// Try PEM
	if block, _ := pem.Decode(priv); block != nil {
		return x509.ParsePKCS1PrivateKey(block.Bytes)
	}
	// Try base 64

pkg crypto/rsa, func DecryptPKCS1v15 //deprecated #75302
pkg crypto/rsa, func DecryptPKCS1v15SessionKey //deprecated #75302
pkg crypto/rsa, func EncryptOAEPWithOptions(io.Reader, *PublicKey, []uint8, *OAEPOptions) ([]uint8, error) #65716
pkg crypto/rsa, func EncryptPKCS1v15 //deprecated #75302
pkg crypto/rsa, type PKCS1v15DecryptOptions //deprecated #75302

		os.Remove(outputFileName)
	}
}

func generateKeys() {
	privatekey, err := rsa.GenerateKey(crand.Reader, 2048)
	if err != nil {
		fmt.Printf("error generating key: %s n", err)
		os.Exit(1)
	}

	// dump private key to file
	privateKeyBytes := x509.MarshalPKCS1PrivateKey(privatekey)
	privateKeyBlock := &pem.Block{
		Type:  "RSA PRIVATE KEY",
		Bytes: privateKeyBytes,
	}