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/*
* X.509 Certificate Authority
* (C) 1999-2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/

#ifndef BOTAN_X509_CA_H__
#define BOTAN_X509_CA_H__

#include <botan/x509cert.h>
#include <botan/x509_crl.h>
#include <botan/x509_ext.h>
#include <botan/pkcs8.h>
#include <botan/pkcs10.h>
#include <botan/pubkey.h>

namespace Botan {

/**
* This class represents X.509 Certificate Authorities (CAs).
*/
class BOTAN_DLL X509_CA
   {
   public:

      /**
      * Sign a PKCS#10 Request.
      * @param req the request to sign
      * @param rng the rng to use
      * @param not_before the starting time for the certificate
      * @param not_after the expiration time for the certificate
      * @return resulting certificate
      */
      X509_Certificate sign_request(const PKCS10_Request& req,
                                    RandomNumberGenerator& rng,
                                    const X509_Time& not_before,
                                    const X509_Time& not_after);

      /**
      * Get the certificate of this CA.
      * @return CA certificate
      */
      X509_Certificate ca_certificate() const;

      /**
      * Create a new and empty CRL for this CA.
      * @param rng the random number generator to use
      * @param next_update the time to set in next update in seconds
      * as the offset from the current time
      * @return new CRL
      */
      X509_CRL new_crl(RandomNumberGenerator& rng,
                       u32bit next_update = 0) const;

      /**
      * Create a new CRL by with additional entries.
      * @param last_crl the last CRL of this CA to add the new entries to
      * @param new_entries contains the new CRL entries to be added to the CRL
      * @param rng the random number generator to use
      * @param next_update the time to set in next update in seconds
      * as the offset from the current time
      */
      X509_CRL update_crl(const X509_CRL& last_crl,
                          const std::vector<CRL_Entry>& new_entries,
                          RandomNumberGenerator& rng,
                          u32bit next_update = 0) const;

      /**
      * Interface for creating new certificates
      * @param signer a signing object
      * @param rng a random number generator
      * @param sig_algo the signature algorithm identifier
      * @param pub_key the serialized public key
      * @param not_before the start time of the certificate
      * @param not_after the end time of the certificate
      * @param issuer_dn the DN of the issuer
      * @param subject_dn the DN of the subject
      * @param extensions an optional list of certificate extensions
      * @returns newly minted certificate
      */
      static X509_Certificate make_cert(PK_Signer* signer,
                                        RandomNumberGenerator& rng,
                                        const AlgorithmIdentifier& sig_algo,
                                        const MemoryRegion<byte>& pub_key,
                                        const X509_Time& not_before,
                                        const X509_Time& not_after,
                                        const X509_DN& issuer_dn,
                                        const X509_DN& subject_dn,
                                        const Extensions& extensions);

      /**
      * Create a new CA object.
      * @param ca_certificate the certificate of the CA
      * @param key the private key of the CA
      * @param hash_fn name of a hash function to use for signing
      */
      X509_CA(const X509_Certificate& ca_certificate,
              const Private_Key& key,
              const std::string& hash_fn);

      ~X509_CA();
   private:
      X509_CA(const X509_CA&) {}
      X509_CA& operator=(const X509_CA&) { return (*this); }

      X509_CRL make_crl(const std::vector<CRL_Entry>& entries,
                        u32bit crl_number, u32bit next_update,
                        RandomNumberGenerator& rng) const;

      AlgorithmIdentifier ca_sig_algo;
      X509_Certificate cert;
      PK_Signer* signer;
   };

/**
* Choose the default signature format for a certain public key signature
* scheme.
* @param key will be the key to choose a padding scheme for
* @param hash_fn is the desired hash function
* @param alg_id will be set to the chosen scheme
* @return A PK_Signer object for generating signatures
*/
BOTAN_DLL PK_Signer* choose_sig_format(const Private_Key& key,
                                       const std::string& hash_fn,
                                       AlgorithmIdentifier& alg_id);

}

#endif