[openssl-users] Programmatic key conversion of PKCS#1 to #8

[Gelareh Taban]

Works beautifully. Thanks very much Matt!

On Fri, Feb 16, 2018 at 11:49 AM, Matt Caswell <matt at openssl.org> wrote:

>
>
> On 16/02/18 17:24, Gelareh Taban wrote:
> > Hi all,
> >
> > I need to convert a Json Web Key (JWK) to PEM PKCS#8 format.
> >
> > I am using creating an RSA key using the parameters in JWK and then
> > using i2d_RSAPublicKey() to  encode the RSA key to PEM PKCS#1.
> >
> > Are there any OpenSSL functions that programmatically convert the key
> > (both public and private) to PKCS#8?
>
> You can use PEM_write_bio_PrivateKey() for this purpose. You need to
> have your RSA key in EVP_PKEY format first. So something like
> (simplified to remove error handling):
>
> EVP_PKEY *key = EVP_PKEY_new();
> EVP_PKEY_assign_RSA(key, rsa);
>
> https://www.openssl.org/docs/man1.1.0/crypto/PEM_write_bio_PrivateKey.html
>
> https://www.openssl.org/docs/man1.1.0/crypto/EVP_PKEY_new.html
>
> https://www.openssl.org/docs/man1.1.0/crypto/EVP_PKEY_assign_RSA.html
>
> Matt
>
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