/* -*- Mode: C; tab-width: 8 -*-*/
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */


#ifndef _CRMFI_H_
#define _CRMFI_H_
/* This file will contain all declarations common to both 
 * encoding and decoding of CRMF Cert Requests.  This header 
 * file should only be included internally by CRMF implementation
 * files.
 */
#include "secasn1.h"
#include "crmfit.h"
#include "secerr.h"
#include "blapit.h"

#define CRMF_DEFAULT_ARENA_SIZE   1024

/*
 * Explanation for the definition of MAX_WRAPPED_KEY_LEN:
 * 
 * It's used for internal buffers to transport a wrapped private key.
 * The value is in BYTES.
 * We want to define a reasonable upper bound for this value.
 * Ideally this could be calculated, but in order to simplify the code
 * we want to estimate the maximum requires size.
 * See also bug 655850 for the full explanation.
 * 
 * We know the largest wrapped keys are RSA keys.
 * We'll estimate the maximum size needed for wrapped RSA keys,
 * and assume it's sufficient for wrapped keys of any type we support.
 * 
 * The maximum size of RSA keys in bits is defined elsewhere as
 *   RSA_MAX_MODULUS_BITS
 * 
 * The idea is to define MAX_WRAPPED_KEY_LEN based on the above.
 * 
 * A wrapped RSA key requires about
 *   ( ( RSA_MAX_MODULUS_BITS / 8 ) * 5.5) + 65
 * bytes.
 * 
 * Therefore, a safe upper bound is:
 *   ( ( RSA_MAX_MODULUS_BITS / 8 ) *8 ) = RSA_MAX_MODULUS_BITS
 * 
 */
#define MAX_WRAPPED_KEY_LEN       RSA_MAX_MODULUS_BITS

#define CRMF_BITS_TO_BYTES(bits) (((bits)+7)/8)
#define CRMF_BYTES_TO_BITS(bytes) ((bytes)*8)

struct crmfEncoderArg {
    SECItem *buffer;
    long     allocatedLen;
};

struct crmfEncoderOutput {
    CRMFEncoderOutputCallback fn;
    void *outputArg;
};

/*
 * This function is used by the API for encoding functions that are 
 * exposed through the API, ie all of the CMMF_Encode* and CRMF_Encode*
 * functions.
 */
extern void
       crmf_encoder_out(void *arg, const char *buf, unsigned long len,
                        int depth, SEC_ASN1EncodingPart data_kind);

/*
 * This function is used when we want to encode something locally within
 * the library, ie the CertRequest so that we can produce its signature.
 */
extern SECStatus 
       crmf_init_encoder_callback_arg (struct crmfEncoderArg *encoderArg,
				       SECItem               *derDest);

/*
 * This is the callback function we feed to the ASN1 encoder when doing
 * internal DER-encodings.  ie, encoding the cert request so we can 
 * produce a signature.
 */
extern void
crmf_generic_encoder_callback(void *arg, const char* buf, unsigned long len,
			      int depth, SEC_ASN1EncodingPart data_kind);

/* The ASN1 templates that need to be seen by internal files
 * in order to implement CRMF.
 */
extern const SEC_ASN1Template CRMFCertReqMsgTemplate[];
extern const SEC_ASN1Template CRMFRAVerifiedTemplate[];
extern const SEC_ASN1Template CRMFPOPOSigningKeyTemplate[];
extern const SEC_ASN1Template CRMFPOPOKeyEnciphermentTemplate[];
extern const SEC_ASN1Template CRMFPOPOKeyAgreementTemplate[];
extern const SEC_ASN1Template CRMFThisMessageTemplate[];
extern const SEC_ASN1Template CRMFSubsequentMessageTemplate[];
extern const SEC_ASN1Template CRMFDHMACTemplate[];
extern const SEC_ASN1Template CRMFEncryptedKeyWithEncryptedValueTemplate[];
extern const SEC_ASN1Template CRMFEncryptedValueTemplate[];

/*
 * Use these two values for encoding Boolean values.
 */
extern const unsigned char hexTrue;
extern const unsigned char hexFalse;
/*
 * Prototypes for helper routines used internally by multiple files.
 */
extern SECStatus crmf_encode_integer(PLArenaPool *poolp, SECItem *dest,
				     long value);
extern SECStatus crmf_make_bitstring_copy(PLArenaPool *arena, SECItem *dest,
					  SECItem *src);

extern SECStatus crmf_copy_pkiarchiveoptions(PLArenaPool           *poolp,
					     CRMFPKIArchiveOptions *destOpt,
					     CRMFPKIArchiveOptions *srcOpt);
extern SECStatus  
       crmf_destroy_pkiarchiveoptions(CRMFPKIArchiveOptions *inArchOptions,
				      PRBool                 freeit);
extern const SEC_ASN1Template*
       crmf_get_pkiarchiveoptions_subtemplate(CRMFControl *inControl);

extern SECStatus crmf_copy_encryptedkey(PLArenaPool       *poolp,
					CRMFEncryptedKey  *srcEncrKey,
					CRMFEncryptedKey  *destEncrKey);
extern SECStatus
crmf_copy_encryptedvalue(PLArenaPool        *poolp,
			 CRMFEncryptedValue *srcValue,
			 CRMFEncryptedValue *destValue);

extern SECStatus
crmf_copy_encryptedvalue_secalg(PLArenaPool     *poolp,
				SECAlgorithmID  *srcAlgId,
				SECAlgorithmID **destAlgId);

extern SECStatus crmf_template_copy_secalg(PLArenaPool *poolp,
					   SECAlgorithmID **dest,
					   SECAlgorithmID *src);

extern SECStatus crmf_copy_cert_name(PLArenaPool *poolp, CERTName **dest,
				     CERTName *src);

extern SECStatus crmf_template_add_public_key(PLArenaPool               *poolp,
					      CERTSubjectPublicKeyInfo **dest,
					      CERTSubjectPublicKeyInfo  *pubKey);

extern CRMFCertExtension* crmf_create_cert_extension(PLArenaPool *poolp,
						     SECOidTag    tag, 
						     PRBool       isCritical,
						     SECItem     *data);
extern CRMFCertRequest*
crmf_copy_cert_request(PLArenaPool *poolp, CRMFCertRequest *srcReq);

extern SECStatus crmf_destroy_encrypted_value(CRMFEncryptedValue *inEncrValue, 
					      PRBool freeit);

extern CRMFEncryptedValue *
crmf_create_encrypted_value_wrapped_privkey(SECKEYPrivateKey   *inPrivKey,
					    SECKEYPublicKey    *inPubKey,
					    CRMFEncryptedValue *destValue);

extern CK_MECHANISM_TYPE 
       crmf_get_mechanism_from_public_key(SECKEYPublicKey *inPubKey);

extern SECStatus
crmf_encrypted_value_unwrap_priv_key(PLArenaPool        *poolp,
				     CRMFEncryptedValue *encValue,
				     SECKEYPrivateKey   *privKey,
				     SECKEYPublicKey    *newPubKey,
				     SECItem            *nickname,
				     PK11SlotInfo       *slot,
				     unsigned char       keyUsage,
				     SECKEYPrivateKey  **unWrappedKey,
				     void               *wincx);

extern SECItem*
crmf_get_public_value(SECKEYPublicKey *pubKey, SECItem *dest);

extern CRMFCertExtension*
crmf_copy_cert_extension(PLArenaPool *poolp, CRMFCertExtension *inExtension);

extern SECStatus
crmf_create_prtime(SECItem *src, PRTime **dest);
#endif /*_CRMFI_H_*/