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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/. */
#include "nsISupports.idl"
interface nsIInputStream;
interface nsIKeyObject;
/**
* nsICryptoHMAC
* This interface provides HMAC signature algorithms.
*/
[scriptable, uuid(8FEB4C7C-1641-4a7b-BC6D-1964E2099497)]
interface nsICryptoHMAC : nsISupports
{
/**
* Hashing Algorithms. These values are to be used by the
* |init| method to indicate which hashing function to
* use. These values map onto the values defined in
* mozilla/security/nss/lib/softoken/pkcs11t.h and are
* switched to CKM_*_HMAC constant.
*/
const short MD2 = 1;
const short MD5 = 2;
const short SHA1 = 3;
const short SHA256 = 4;
const short SHA384 = 5;
const short SHA512 = 6;
/**
* Initialize the hashing object. This method may be
* called multiple times with different algorithm types.
*
* @param aAlgorithm the algorithm type to be used.
* This value must be one of the above valid
* algorithm types.
*
* @param aKeyObject
* Object holding a key. To create the key object use for instance:
* var keyObject = Components.classes["@mozilla.org/security/keyobjectfactory;1"]
* .getService(Components.interfaces.nsIKeyObjectFactory)
* .keyFromString(Components.interfaces.nsIKeyObject.HMAC, rawKeyData);
*
* WARNING: This approach is not FIPS compliant.
*
* @throws NS_ERROR_INVALID_ARG if an unsupported algorithm
* type is passed.
*
* NOTE: This method must be called before any other method
* on this interface is called.
*/
void init(in unsigned long aAlgorithm, in nsIKeyObject aKeyObject);
/**
* @param aData a buffer to calculate the hash over
*
* @param aLen the length of the buffer |aData|
*
* @throws NS_ERROR_NOT_INITIALIZED if |init| has not been
* called.
*/
void update([const, array, size_is(aLen)] in octet aData, in unsigned long aLen);
/**
* Calculates and updates a new hash based on a given data stream.
*
* @param aStream an input stream to read from.
*
* @param aLen how much to read from the given |aStream|. Passing
* UINT32_MAX indicates that all data available will be used
* to update the hash.
*
* @throws NS_ERROR_NOT_INITIALIZED if |init| has not been
* called.
*
* @throws NS_ERROR_NOT_AVAILABLE if the requested amount of
* data to be calculated into the hash is not available.
*
*/
void updateFromStream(in nsIInputStream aStream, in unsigned long aLen);
/**
* Completes this HMAC object and produces the actual HMAC diegest data.
*
* @param aASCII if true then the returned value is a base-64
* encoded string. if false, then the returned value is
* binary data.
*
* @return a hash of the data that was read by this object. This can
* be either binary data or base 64 encoded.
*
* @throws NS_ERROR_NOT_INITIALIZED if |init| has not been
* called.
*
* NOTE: This method may be called any time after |init|
* is called. This call resets the object to its
* pre-init state.
*/
ACString finish(in boolean aASCII);
/**
* Reinitialize HMAC context to be reused with the same
* settings (the key and hash algorithm) but on different
* set of data.
*/
void reset();
};
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