2012-10-01 11:02:15 -07:00
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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2008-06-06 05:40:11 -07:00
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#ifndef _ALGHMAC_H_
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#define _ALGHMAC_H_
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typedef struct HMACContextStr HMACContext;
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SEC_BEGIN_PROTOS
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/* destroy HMAC context */
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extern void
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HMAC_Destroy(HMACContext *cx, PRBool freeit);
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/* create HMAC context
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* hash_obj hash object from SECRawHashObjects[]
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* secret the secret with which the HMAC is performed.
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* secret_len the length of the secret.
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* isFIPS true if conforming to FIPS 198.
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*
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* NULL is returned if an error occurs.
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*/
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extern HMACContext *
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HMAC_Create(const SECHashObject *hash_obj, const unsigned char *secret,
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unsigned int secret_len, PRBool isFIPS);
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/* like HMAC_Create, except caller allocates HMACContext. */
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SECStatus
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HMAC_Init(HMACContext *cx, const SECHashObject *hash_obj,
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const unsigned char *secret, unsigned int secret_len, PRBool isFIPS);
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/* reset HMAC for a fresh round */
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extern void
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HMAC_Begin(HMACContext *cx);
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/* update HMAC
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* cx HMAC Context
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* data the data to perform HMAC on
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* data_len the length of the data to process
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*/
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extern void
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HMAC_Update(HMACContext *cx, const unsigned char *data, unsigned int data_len);
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/* Finish HMAC -- place the results within result
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* cx HMAC context
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* result buffer for resulting hmac'd data
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* result_len where the resultant hmac length is stored
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* max_result_len maximum possible length that can be stored in result
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*/
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extern SECStatus
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HMAC_Finish(HMACContext *cx, unsigned char *result, unsigned int *result_len,
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unsigned int max_result_len);
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/* clone a copy of the HMAC state. this is usefult when you would
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* need to keep a running hmac but also need to extract portions
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* partway through the process.
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*/
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extern HMACContext *
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HMAC_Clone(HMACContext *cx);
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SEC_END_PROTOS
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#endif
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