1 /* Copyright (c) (2010,2011,2015-2019,2021) Apple Inc. All rights reserved.
2 *
3 * corecrypto is licensed under Apple Inc.’s Internal Use License Agreement (which
4 * is contained in the License.txt file distributed with corecrypto) and only to
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10 *
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
16 * compliance with the License. The rights granted to you under the License
17 * may not be used to create, or enable the creation or redistribution of,
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19 * circumvent, violate, or enable the circumvention or violation of, any
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21 *
22 * Please obtain a copy of the License at
23 * http://www.opensource.apple.com/apsl/ and read it before using this file.
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25 * The Original Code and all software distributed under the License are
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28 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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30 * Please see the License for the specific language governing rights and
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34 */
35
36 #include <corecrypto/ccdigest_priv.h>
37 #include <corecrypto/cc_priv.h>
38 #include "ccdigest_internal.h"
39
40 /* This can be used for SHA1, SHA256 and SHA224 */
41 void
ccdigest_final_64be(const struct ccdigest_info * di,ccdigest_ctx_t ctx,unsigned char * digest)42 ccdigest_final_64be(const struct ccdigest_info *di, ccdigest_ctx_t ctx, unsigned char *digest)
43 {
44 // Sanity check to recover from ctx corruptions.
45 if (ccdigest_num(di, ctx) >= di->block_size) {
46 ccdigest_num(di, ctx) = 0;
47 }
48
49 // Clone the state.
50 ccdigest_di_decl(di, tmp);
51 cc_memcpy(tmp, ctx, ccdigest_di_size(di));
52
53 ccdigest_nbits(di, tmp) += ccdigest_num(di, tmp) * 8;
54 ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0x80;
55
56 /* If we don't have at least 8 bytes (for the length) left we need to add
57 * a second block. */
58 if (ccdigest_num(di, tmp) > 64 - 8) {
59 while (ccdigest_num(di, tmp) < 64) {
60 ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0;
61 }
62 di->compress(ccdigest_state(di, tmp), 1, ccdigest_data(di, tmp));
63 ccdigest_num(di, tmp) = 0;
64 }
65
66 /* pad upto block_size minus 8 with 0s */
67 while (ccdigest_num(di, tmp) < 64 - 8) {
68 ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0;
69 }
70
71 cc_store64_be(ccdigest_nbits(di, tmp), ccdigest_data(di, tmp) + 64 - 8);
72 di->compress(ccdigest_state(di, tmp), 1, ccdigest_data(di, tmp));
73
74 /* copy output */
75 for (unsigned int i = 0; i < di->output_size / 4; i++) {
76 cc_store32_be(ccdigest_state_u32(di, tmp)[i], digest + (4 * i));
77 }
78
79 ccdigest_di_clear(di, tmp);
80 }
81