1/* Copyright (c) (2010,2011,2015,2017-2019,2021) Apple Inc. All rights reserved.
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34 */
35
36#include "cc_internal.h"
37#include <corecrypto/ccdigest_priv.h>
38#include <corecrypto/cchmac.h>
39#include <corecrypto/ccn.h>
40#include <corecrypto/cc_priv.h>
41
42void
43cchmac_final(const struct ccdigest_info *di, cchmac_ctx_t hc,
44 unsigned char *mac)
45{
46 CC_ENSURE_DIT_ENABLED
47
48
49 // Finalize the inner state of the data being HMAC'd, i.e., H((key \oplus ipad) || m)
50 ccdigest_final(di, cchmac_digest_ctx(di, hc), cchmac_data(di, hc));
51
52 // Set the HMAC output size based on the digest algorithm
53 cchmac_num(di, hc) = (unsigned int)di->output_size; /* typecast: output size will always fit in an unsigned int */
54 cchmac_nbits(di, hc) = di->block_size * 8;
55
56 // Copy the pre-computed compress(key \oplus opad) back to digest state,
57 // and then run through the digest once more to finish the HMAC
58 ccdigest_copy_state(di, cchmac_istate32(di, hc), cchmac_ostate32(di, hc));
59 ccdigest_final(di, cchmac_digest_ctx(di, hc), digest: mac);
60}
61