/* * cchmac_final.c * corecrypto * * Created on 12/07/2010 * * Copyright (c) 2010,2011,2015 Apple Inc. All rights reserved. * * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #include <corecrypto/ccdigest_priv.h> #include <corecrypto/cchmac.h> #include <corecrypto/ccn.h> #include <corecrypto/cc_priv.h> void cchmac_final(const struct ccdigest_info *di, cchmac_ctx_t hc, unsigned char *mac) { // Finalize the inner state of the data being HMAC'd, i.e., H((key \oplus ipad) || m) ccdigest_final(di, cchmac_digest_ctx(di, hc), cchmac_data(di, hc)); // Set the HMAC output size based on the digest algorithm cchmac_num(di, hc) = (unsigned int)di->output_size; /* typecast: output size will alwys fit in an unsigned int */ cchmac_nbits(di, hc) = di->block_size * 8; // Copy the pre-computed compress(key \oplus opad) back to digest state, // and then run through the digest once more to finish the HMAC ccdigest_copy_state(di, cchmac_istate32(di, hc), cchmac_ostate32(di, hc)); ccdigest_final(di, cchmac_digest_ctx(di, hc), mac); }