1 /*
2 * ccdigest_final_64be.c
3 * corecrypto
4 *
5 * Created on 12/06/2010
6 *
7 * Copyright (c) 2010,2011,2015 Apple Inc. All rights reserved.
8 *
9 *
10 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
11 *
12 * This file contains Original Code and/or Modifications of Original Code
13 * as defined in and that are subject to the Apple Public Source License
14 * Version 2.0 (the 'License'). You may not use this file except in
15 * compliance with the License. The rights granted to you under the License
16 * may not be used to create, or enable the creation or redistribution of,
17 * unlawful or unlicensed copies of an Apple operating system, or to
18 * circumvent, violate, or enable the circumvention or violation of, any
19 * terms of an Apple operating system software license agreement.
20 *
21 * Please obtain a copy of the License at
22 * http://www.opensource.apple.com/apsl/ and read it before using this file.
23 *
24 * The Original Code and all software distributed under the License are
25 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
26 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
27 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
28 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
29 * Please see the License for the specific language governing rights and
30 * limitations under the License.
31 *
32 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
33 */
34
35 #include <corecrypto/ccdigest_priv.h>
36 #include <corecrypto/cc_priv.h>
37 #include "ccdigest_internal.h"
38
39 /* This can be used for SHA1, SHA256 and SHA224 */
40 void
ccdigest_final_64be(const struct ccdigest_info * di,ccdigest_ctx_t ctx,unsigned char * digest)41 ccdigest_final_64be(const struct ccdigest_info *di, ccdigest_ctx_t ctx, unsigned char *digest)
42 {
43 // Sanity check to recover from ctx corruptions.
44 if (ccdigest_num(di, ctx) >= di->block_size) {
45 ccdigest_num(di, ctx) = 0;
46 }
47
48 // Clone the state.
49 ccdigest_di_decl(di, tmp);
50 cc_memcpy(tmp, ctx, ccdigest_di_size(di));
51
52 ccdigest_nbits(di, tmp) += ccdigest_num(di, tmp) * 8;
53 ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0x80;
54
55 /* If we don't have at least 8 bytes (for the length) left we need to add
56 * a second block. */
57 if (ccdigest_num(di, tmp) > 64 - 8) {
58 while (ccdigest_num(di, tmp) < 64) {
59 ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0;
60 }
61 di->compress(ccdigest_state(di, tmp), 1, ccdigest_data(di, tmp));
62 ccdigest_num(di, tmp) = 0;
63 }
64
65 /* pad upto block_size minus 8 with 0s */
66 while (ccdigest_num(di, tmp) < 64 - 8) {
67 ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0;
68 }
69
70 CC_STORE64_BE(ccdigest_nbits(di, tmp), ccdigest_data(di, tmp) + 64 - 8);
71 di->compress(ccdigest_state(di, tmp), 1, ccdigest_data(di, tmp));
72
73 /* copy output */
74 for (unsigned int i = 0; i < di->output_size / 4; i++) {
75 CC_STORE32_BE(ccdigest_state_u32(di, tmp)[i], digest + (4 * i));
76 }
77
78 ccdigest_di_clear(di, tmp);
79 }
80