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Re: Importing a PKCS#1 RSAPublicKey structure into a gnutls_pubkey_t
From: |
René Korthaus |
Subject: |
Re: Importing a PKCS#1 RSAPublicKey structure into a gnutls_pubkey_t |
Date: |
Tue, 7 Aug 2012 09:11:23 +0200 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20120713 Thunderbird/14.0 |
Thanks for the clarification. Then is there a reason that gnutls offers
no method to import a PKCS#1 RSAPublicKey structure - given that it is a
standard format and almost all smartcards speak it plus RSAPublicKey is
very similar to RSAPrivateKey and gnutls can already decode
RSAPrivateKey structures with _gnutls_privkey_decode_pkcs1_rsa_key. From
the code I've seen it should be fairly easy to implement and would make
us very happy. :)
Regards, René
Am 04.08.2012 22:31, schrieb Nikos Mavrogiannopoulos:
On 08/03/2012 02:39 PM, René Korthaus wrote:
Hello list,
I have a smartcard that gives me a PKCS#1 RSAPublicKey structure of the
public key on the card and I need to generate a X.509
SubjectPublicKeyInfo structure from it. I already have a C++ wrapper
class that uses gnutls_pubkey_export to generate the
SubjectPublicKeyInfo structure. The question is how to import the
RSAPublicKey structure right.
There is no exported function in gnutls that can read the RSAPublicKey
structure. gnutls_rsa_params_t reads the private key not the public (the
documentation has a typo which I just fixed).
You can read this DER structure by using libtasn1. Check
lib/x509/key_decode.c, and the function _gnutls_x509_read_rsa_pubkey().
After extracting the values you can import them using
gnutls_pubkey_import_rsa_raw().
regards,
Nikos
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