1/* Copyright (c) (2010,2011,2014-2016,2018,2019,2021) Apple Inc. All rights reserved.
2 *
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11 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
12 *
13 * This file contains Original Code and/or Modifications of Original Code
14 * as defined in and that are subject to the Apple Public Source License
15 * Version 2.0 (the 'License'). You may not use this file except in
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34 */
35
36#include "cc_internal.h"
37#include <corecrypto/ccdigest.h>
38#include <corecrypto/cc_priv.h>
39
40void
41ccdigest_update(const struct ccdigest_info *di, ccdigest_ctx_t ctx, size_t len, const void *data)
42{
43 CC_ENSURE_DIT_ENABLED
44
45 const char * data_ptr = data;
46 size_t nblocks, nbytes;
47
48 // Sanity check to recover from ctx corruptions.
49 if (ccdigest_num(di, ctx) >= di->block_size) {
50 ccdigest_num(di, ctx) = 0;
51 }
52
53 while (len > 0) {
54 if (ccdigest_num(di, ctx) == 0 && len > di->block_size) {
55 if (di->block_size == 1 << 6) { // md5 & sha1 & sha256
56 nblocks = len >> 6;
57 nbytes = nblocks << 6;
58 } else if (di->block_size == 1 << 7) { // sha384 & sha512
59 nblocks = len >> 7;
60 nbytes = nblocks << 7;
61 } else {
62 nblocks = len / di->block_size;
63 nbytes = nblocks * di->block_size;
64 }
65
66 di->compress(ccdigest_state(di, ctx), nblocks, data_ptr);
67 len -= nbytes;
68 data_ptr += nbytes;
69 ccdigest_nbits(di, ctx) += (uint64_t) (nbytes) * 8;
70 } else {
71 size_t n = CC_MIN(di->block_size - ccdigest_num(di, ctx), len);
72 cc_memcpy(ccdigest_data(di, ctx) + ccdigest_num(di, ctx), data_ptr, n);
73 /* typecast: less than block size, will always fit into an int */
74 ccdigest_num(di, ctx) += (unsigned int)n;
75 len -= n;
76 data_ptr += n;
77 if (ccdigest_num(di, ctx) == di->block_size) {
78 di->compress(ccdigest_state(di, ctx), 1, ccdigest_data(di, ctx));
79 ccdigest_nbits(di, ctx) += ccdigest_num(di, ctx) * 8;
80 ccdigest_num(di, ctx) = 0;
81 }
82 }
83 }
84}
85