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diff --git a/security/nss/lib/freebl/alghmac.h b/security/nss/lib/freebl/alghmac.h
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+/* 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 _ALGHMAC_H_
+#define _ALGHMAC_H_
+
+typedef struct HMACContextStr HMACContext;
+
+SEC_BEGIN_PROTOS
+
+/* destroy HMAC context */
+extern void
+HMAC_Destroy(HMACContext *cx, PRBool freeit);
+
+/* create HMAC context
+ * hash_obj hash object from SECRawHashObjects[]
+ * secret the secret with which the HMAC is performed.
+ * secret_len the length of the secret.
+ * isFIPS true if conforming to FIPS 198.
+ *
+ * NULL is returned if an error occurs.
+ */
+extern HMACContext *
+HMAC_Create(const SECHashObject *hash_obj, const unsigned char *secret,
+ unsigned int secret_len, PRBool isFIPS);
+
+/* like HMAC_Create, except caller allocates HMACContext. */
+SECStatus
+HMAC_Init(HMACContext *cx, const SECHashObject *hash_obj,
+ const unsigned char *secret, unsigned int secret_len, PRBool isFIPS);
+
+/* 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