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/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
#ifndef _ALGHMAC_H_
#define _ALGHMAC_H_
typedef struct HMACContextStr HMACContext;
SEC_BEGIN_PROTOS
/* destroy HMAC context */
extern void
HMAC_Destroy(HMACContext *cx);
/* create HMAC context
* hash_alg the algorithm with which the HMAC is performed. This
* should be, SEC_OID_MD5, SEC_OID_SHA1, or SEC_OID_MD2.
* secret the secret with which the HMAC is performed.
* secret_len the length of the secret, limited to at most 64 bytes.
*
* NULL is returned if an error occurs or the secret is > 64 bytes.
*/
extern HMACContext *
HMAC_Create(const SECHashObject *hashObj, const unsigned char *secret,
unsigned int secret_len);
/* reset HMAC for a fresh round */
extern void
HMAC_Begin(HMACContext *cx);
/* update HMAC
* cx HMAC Context
* data the data to perform HMAC on
* data_len the length of the data to process
*/
extern void
HMAC_Update(HMACContext *cx, const unsigned char *data, unsigned int data_len);
/* Finish HMAC -- place the results within result
* cx HMAC context
* result buffer for resulting hmac'd data
* result_len where the resultant hmac length is stored
* max_result_len maximum possible length that can be stored in result
*/
extern SECStatus
HMAC_Finish(HMACContext *cx, unsigned char *result, unsigned int *result_len,
unsigned int max_result_len);
/* clone a copy of the HMAC state. this is usefult when you would
* need to keep a running hmac but also need to extract portions
* partway through the process.
*/
extern HMACContext *
HMAC_Clone(HMACContext *cx);
SEC_END_PROTOS
#endif
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